SEC Info - Tecogen Inc. - ‘10-Q’ for 9/30/19

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Tecogen Inc. – ‘10-Q’ for 9/30/19 – ‘EX-101.LAB’

On: Tuesday, 11/12/19, at 1:08pm ET · For: 9/30/19 · Accession #: 1537435-19-48 · File #: 1-36103

  As Of               Filer                 Filing    For·On·As Docs:Size

11/12/19  Tecogen Inc.                      10-Q        9/30/19   64:5.6M

Quarterly Report — Form 10-Q — Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML    441K 
 2: EX-31.1     Certification -- §302 - SOA'02                      HTML     26K 
 3: EX-31.2     Certification -- §302 - SOA'02                      HTML     26K 
 4: EX-32.1     Certification -- §906 - SOA'02                      HTML     21K 
32: R1          Document and Entity Information Document and        HTML     46K 
                Entity Information                                               
55: R2          Condensed Consolidated Balance Sheets               HTML    118K 
46: R3          Condensed Consolidated Balance Sheets               HTML     29K 
                (Parenthetical)                                                  
14: R4          Condensed Consolidated Statements of Operations     HTML     94K 
29: R5          Condensed Consolidated Statements of Stockholders'  HTML     77K 
                Equity Statement                                                 
52: R6          Condensed Consolidated Statements of Cash Flows     HTML    125K 
43: R7          Description of business and basis of presentation   HTML     38K 
13: R8          Revenue                                             HTML    101K 
33: R9          Loss Per Common Share                               HTML     40K 
18: R10         Property, Plant and Equipment                       HTML     42K 
22: R11         Intangible Assets and Liabilities Other Than        HTML     86K 
                Goodwill                                                         
62: R12         Sale of Energy Producing Assets and Goodwill        HTML     29K 
                Impairment                                                       
38: R13         Leases                                              HTML     39K 
19: R14         Stock-Based Compensation                            HTML     53K 
23: R15         Fair Value Measurements                             HTML     47K 
64: R16         Revolving Line of Credit, Bank (Notes)              HTML     27K 
39: R17         Commitments and contingencies                       HTML     25K 
17: R18         Related party transactions                          HTML     37K 
24: R19         Segments                                            HTML    124K 
48: R20         Subsequent Events                                   HTML     22K 
41: R21         Description of business and basis of presentation   HTML     38K 
                (Policies)                                                       
11: R22         Revenue (Tables)                                    HTML     77K 
27: R23         Loss Per Common Share (Tables)                      HTML     40K 
49: R24         Property, Plant and Equipment (Tables)              HTML     40K 
42: R25         Intangible Assets and Liabilities Other Than        HTML     83K 
                Goodwill (Tables)                                                
12: R26         Leases (Tables)                                     HTML     38K 
28: R27         Stock-Based Compensation (Tables)                   HTML     51K 
50: R28         Fair Value Measurements (Tables)                    HTML     45K 
40: R29         Related Party Transactions (Tables)                 HTML     28K 
36: R30         Segments (Tables)                                   HTML    125K 
61: R31         Description of business and basis of presentation   HTML     42K 
                - Additional Information (Details)                               
26: R32         Revenue - Disaggregation of Revenue (Details)       HTML     53K 
21: R33         Revenue - Additional Information (Details)          HTML     42K 
35: R34         Loss Per Common Share - Schedule of Income (Loss)   HTML     35K 
                Per Common Share, Basic and Diluted (Details)                    
60: R35         Property, Plant and Equipment - Summary of          HTML     49K 
                Property and Equipment (Details)                                 
25: R36         Property, Plant and Equipment - Depreciation        HTML     21K 
                (Details)                                                        
20: R37         Intangible Assets and Liabilities Other Than        HTML     25K 
                Goodwill (Details)                                               
37: R38         Intangible Assets and Liabilities Other Than        HTML     52K 
                Goodwill -Amounts related to intangible assets                   
                (Details)                                                        
59: R39         Intangible Assets and Liabilities Other Than        HTML     33K 
                Goodwill - Future Amortization of Customer                       
                Contracts (Details)                                              
45: R40         Sale of Energy Producing Assets and Goodwill        HTML     31K 
                Impairment (Details)                                             
54: R41         Leases (Details)                                    HTML     32K 
31: R42         Leases - Future Minimum Lease Commitments           HTML     38K 
                (Details)                                                        
16: R43         Stock-Based Compensation - Stock-Based              HTML     32K 
                Compensation (Details)                                           
44: R44         Stock-Based Compensation - Stock Option Activity    HTML     86K 
                (Details)                                                        
53: R45         Fair Value Measurements - Fair Value on a           HTML     38K 
                Recurring Basis (Details)                                        
30: R46         Fair Value Measurements - Change in Level 2 Assets  HTML     26K 
                (Details)                                                        
15: R47         Revolving Line of Credit, Bank (Details)            HTML     48K 
47: R48         Commitments and Contingencies (Details)             HTML     26K 
51: R49         Related party transactions (Details)                HTML     49K 
57: R50         Related party transactions - Assets Acquired and    HTML     41K 
                Liabilities Assumed (Details)                                    
34: R51         Segments (Details)                                  HTML     52K 
56: XML         IDEA XML File -- Filing Summary                      XML    113K 
63: EXCEL       IDEA Workbook of Financial Reports                  XLSX     63K 
 5: EX-101.INS  XBRL Instance -- tgen-20190930                       XML   1.72M 
 7: EX-101.CAL  XBRL Calculations -- tgen-20190930_cal               XML    176K 
 8: EX-101.DEF  XBRL Definitions -- tgen-20190930_def                XML    440K 
 9: EX-101.LAB  XBRL Labels -- tgen-20190930_lab                     XML   1.21M 
10: EX-101.PRE  XBRL Presentations -- tgen-20190930_pre              XML    681K 
 6: EX-101.SCH  XBRL Schema -- tgen-20190930                         XSD    119K 
58: ZIP         XBRL Zipped Folder -- 0001537435-19-000048-xbrl      Zip    164K

‘EX-101.LAB’ — XBRL Labels — tgen-20190930_lab

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<link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_15B9F121881840EA9C216D622FD39F7A_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_15B9F121881840EA9C216D622FD39F7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> AOCI Attributable to Parent [Member] </link:label>

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<link:label id="lab_us-gaap_RetainedEarningsMember_C46E6DC65C44CD1177B46D622FD32121_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsMember_C46E6DC65C44CD1177B46D622FD32121" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retained Earnings [Member] </link:label>

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<link:label id="lab_us-gaap_NoncontrollingInterestMember_0A6A35DE58DC12C809A36D622FD30AB9_terseLabel_en-US" xlink:label="lab_us-gaap_NoncontrollingInterestMember_0A6A35DE58DC12C809A36D622FD30AB9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Noncontrolling Interest </link:label>

<link:label id="lab_us-gaap_NoncontrollingInterestMember_0A6A35DE58DC12C809A36D622FD30AB9_label_en-US" xlink:label="lab_us-gaap_NoncontrollingInterestMember_0A6A35DE58DC12C809A36D622FD30AB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Noncontrolling Interest [Member] </link:label>

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<link:label id="lab_us-gaap_StatementLineItems_2D17A23945A469A348956D622FD30830_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_2D17A23945A469A348956D622FD30830" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement [Line Items] </link:label>

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<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_20F4D1549ECC795835946D622FD3235F_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_20F4D1549ECC795835946D622FD3235F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Stockholders' Equity [Roll Forward] </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_20F4D1549ECC795835946D622FD3235F_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_20F4D1549ECC795835946D622FD3235F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Stockholders' Equity [Roll Forward] </link:label>

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<link:label id="lab_us-gaap_SharesOutstanding_900A92A4EC1798984A5E6D622FD334A8_periodStartLabel_en-US" xlink:label="lab_us-gaap_SharesOutstanding_900A92A4EC1798984A5E6D622FD334A8" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Beginning balance (shares) </link:label>

<link:label id="lab_us-gaap_SharesOutstanding_900A92A4EC1798984A5E6D622FD334A8_label_en-US" xlink:label="lab_us-gaap_SharesOutstanding_900A92A4EC1798984A5E6D622FD334A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Shares, Outstanding </link:label>

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<link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_1788655AA3269F26CF3C6D622FD3912D_periodStartLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_1788655AA3269F26CF3C6D622FD3912D" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Beginning balance </link:label>

<link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_1788655AA3269F26CF3C6D622FD3912D_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_1788655AA3269F26CF3C6D622FD3912D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest </link:label>

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<link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_702B8CA26FC025A3271F6D622FD39ED5_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_702B8CA26FC025A3271F6D622FD39ED5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Reclassification of Accumulated Other Comprehensive Loss </link:label>

<link:label id="lab_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_702B8CA26FC025A3271F6D622FD39ED5_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_702B8CA26FC025A3271F6D622FD39ED5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_702B8CA26FC025A3271F6D622FD39ED5" xlink:type="locator"/>

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<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2B41F561567FC961756C6D622FD3EC36_terseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2B41F561567FC961756C6D622FD3EC36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise of stock options (shares) </link:label>

<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2B41F561567FC961756C6D622FD3EC36_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2B41F561567FC961756C6D622FD3EC36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_2B41F561567FC961756C6D622FD3EC36" xlink:type="locator"/>

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<link:label id="lab_tgen_SettlementOfReceivableFromShareholder_6C9A97DF8581F75228526D622FD30E42_terseLabel_en-US" xlink:label="lab_tgen_SettlementOfReceivableFromShareholder_6C9A97DF8581F75228526D622FD30E42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise of stock options </link:label>

<link:label id="lab_tgen_SettlementOfReceivableFromShareholder_6C9A97DF8581F75228526D622FD30E42_label_en-US" xlink:label="lab_tgen_SettlementOfReceivableFromShareholder_6C9A97DF8581F75228526D622FD30E42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Settlement of Receivable from Shareholder </link:label>

<link:label id="lab_tgen_SettlementOfReceivableFromShareholder_6C9A97DF8581F75228526D622FD30E42_documentation_en-US" xlink:label="lab_tgen_SettlementOfReceivableFromShareholder_6C9A97DF8581F75228526D622FD30E42" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Settlement of Receivable from Shareholder </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_SettlementOfReceivableFromShareholder" xlink:label="loc_tgen_SettlementOfReceivableFromShareholder_6C9A97DF8581F75228526D622FD30E42" xlink:type="locator"/>

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<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_EFEB75551E624A9B5FF26D622FD3B15E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_EFEB75551E624A9B5FF26D622FD3B15E" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Stock issuance costs </link:label>

<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_EFEB75551E624A9B5FF26D622FD3B15E_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_EFEB75551E624A9B5FF26D622FD3B15E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_EFEB75551E624A9B5FF26D622FD3B15E" xlink:type="locator"/>

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<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0EC5D97AC56FA027FA596D622FD31C8B_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0EC5D97AC56FA027FA596D622FD31C8B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock based compensation expense </link:label>

<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0EC5D97AC56FA027FA596D622FD31C8B_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0EC5D97AC56FA027FA596D622FD31C8B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition </link:label>

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<link:label id="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_DED2A9490D11EB5954346D622FD3C377_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_DED2A9490D11EB5954346D622FD3C377" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Distributions to Noncontrolling interests </link:label>

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<link:label id="lab_us-gaap_NetIncomeLoss_4E51575B0274A447ECBD6D622FD3C493_verboseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_4E51575B0274A447ECBD6D622FD3C493" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Net income (loss) </link:label>

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<link:label id="lab_us-gaap_RelatedPartyTransactionsAbstract_ABFEA9490FEC614A52F36D622F66DF76_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsAbstract_ABFEA9490FEC614A52F36D622F66DF76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Related Party Transactions [Abstract] </link:label>

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<link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_24D0D5CE60127BF9D9176D622F66831C_terseLabel_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_24D0D5CE60127BF9D9176D622F66831C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Related party transactions </link:label>

<link:label id="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_24D0D5CE60127BF9D9176D622F66831C_label_en-US" xlink:label="lab_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_24D0D5CE60127BF9D9176D622F66831C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Related Party Transactions Disclosure [Text Block] </link:label>

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<link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_CA8AB552A0E07F4D55EE378564DBF3AD_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract_CA8AB552A0E07F4D55EE378564DBF3AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Financial Position [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_CA8AB552A0E07F4D55EE378564DBF3AD" xlink:type="locator"/>

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<link:label id="lab_us-gaap_AssetsAbstract_6962C18311AF91B02484378564DB7462_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_6962C18311AF91B02484378564DB7462" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> ASSETS </link:label>

<link:label id="lab_us-gaap_AssetsAbstract_6962C18311AF91B02484378564DB7462_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_6962C18311AF91B02484378564DB7462" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_6962C18311AF91B02484378564DB7462" xlink:type="locator"/>

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<link:label id="lab_us-gaap_AssetsCurrentAbstract_8B10542891BBF497A015378564DB4ECA_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_8B10542891BBF497A015378564DB4ECA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current assets: </link:label>

<link:label id="lab_us-gaap_AssetsCurrentAbstract_8B10542891BBF497A015378564DB4ECA_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_8B10542891BBF497A015378564DB4ECA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_8B10542891BBF497A015378564DB4ECA" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E926E3EB2B15DFD670FD378564DB9689_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E926E3EB2B15DFD670FD378564DB9689" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents </link:label>

<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E926E3EB2B15DFD670FD378564DB9689_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E926E3EB2B15DFD670FD378564DB9689" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents, at Carrying Value </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_E926E3EB2B15DFD670FD378564DB9689" xlink:type="locator"/>

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<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_929F20E5F7087A262D74378564DBCC67_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_929F20E5F7087A262D74378564DBCC67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable, net </link:label>

<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_929F20E5F7087A262D74378564DBCC67_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_929F20E5F7087A262D74378564DBCC67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, Net, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_929F20E5F7087A262D74378564DBCC67" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms_C900ED6D1274BCFFDF4E378564DBAA93_terseLabel_en-US" xlink:label="lab_us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms_C900ED6D1274BCFFDF4E378564DBAA93" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unbilled revenue </link:label>

<link:label id="lab_us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms_C900ED6D1274BCFFDF4E378564DBAA93_label_en-US" xlink:label="lab_us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms_C900ED6D1274BCFFDF4E378564DBAA93" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Costs in Excess of Billings </link:label>

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<link:label id="lab_us-gaap_InventoryNet_026EC70C47A693B807BD378564DB8C8F_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_026EC70C47A693B807BD378564DB8C8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Inventory, net </link:label>

<link:label id="lab_us-gaap_InventoryNet_026EC70C47A693B807BD378564DB8C8F_label_en-US" xlink:label="lab_us-gaap_InventoryNet_026EC70C47A693B807BD378564DB8C8F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Inventory, Net </link:label>

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<link:label id="lab_us-gaap_DueFromRelatedPartiesCurrent_33607FB039BE140980EE378564DB7603_terseLabel_en-US" xlink:label="lab_us-gaap_DueFromRelatedPartiesCurrent_33607FB039BE140980EE378564DB7603" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Due from related party </link:label>

<link:label id="lab_us-gaap_DueFromRelatedPartiesCurrent_33607FB039BE140980EE378564DB7603_label_en-US" xlink:label="lab_us-gaap_DueFromRelatedPartiesCurrent_33607FB039BE140980EE378564DB7603" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Due from Related Parties, Current </link:label>

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<link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_4018C2A78304210590C3378564DB2AEF_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_4018C2A78304210590C3378564DB2AEF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid and other current assets </link:label>

<link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_4018C2A78304210590C3378564DB2AEF_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_4018C2A78304210590C3378564DB2AEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Prepaid Expense and Other Assets, Current </link:label>

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<link:label id="lab_us-gaap_AssetsCurrent_E960938B820837D44E54378564DB4AD9_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_E960938B820837D44E54378564DB4AD9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current assets </link:label>

<link:label id="lab_us-gaap_AssetsCurrent_E960938B820837D44E54378564DB4AD9_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_E960938B820837D44E54378564DB4AD9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current </link:label>

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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_3115E933FCF5CD04F1C4378564DBE876_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_3115E933FCF5CD04F1C4378564DBE876" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, plant and equipment, net </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_3115E933FCF5CD04F1C4378564DBE876_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_3115E933FCF5CD04F1C4378564DBE876" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Net </link:label>

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<link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_0B1116BBE4D36BCD0936378564DB0BB4_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_0B1116BBE4D36BCD0936378564DB0BB4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Right of use assets </link:label>

<link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_0B1116BBE4D36BCD0936378564DB0BB4_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_0B1116BBE4D36BCD0936378564DB0BB4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Right-of-Use Asset </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_0B1116BBE4D36BCD0936378564DB0BB4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseRightOfUseAsset_0B1116BBE4D36BCD0936378564DB0BB4" xlink:to="lab_us-gaap_OperatingLeaseRightOfUseAsset_0B1116BBE4D36BCD0936378564DB0BB4" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_0E55F2EA425A6FCD3622378564DB482D_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_0E55F2EA425A6FCD3622378564DB482D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intangible assets, net </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_0E55F2EA425A6FCD3622378564DB482D_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_0E55F2EA425A6FCD3622378564DB482D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Net </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_0E55F2EA425A6FCD3622378564DB482D" xlink:type="locator"/>

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<link:label id="lab_us-gaap_Goodwill_F37C6B8A380081DABE02378564DBD24E_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_F37C6B8A380081DABE02378564DBD24E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>

<link:label id="lab_us-gaap_Goodwill_F37C6B8A380081DABE02378564DBD24E_label_en-US" xlink:label="lab_us-gaap_Goodwill_F37C6B8A380081DABE02378564DBD24E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_F37C6B8A380081DABE02378564DBD24E" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherAssetsNoncurrent_1BC6337F52860130C633378564DB9D0A_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_1BC6337F52860130C633378564DB9D0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other assets </link:label>

<link:label id="lab_us-gaap_OtherAssetsNoncurrent_1BC6337F52860130C633378564DB9D0A_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_1BC6337F52860130C633378564DB9D0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Noncurrent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_1BC6337F52860130C633378564DB9D0A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_1BC6337F52860130C633378564DB9D0A" xlink:to="lab_us-gaap_OtherAssetsNoncurrent_1BC6337F52860130C633378564DB9D0A" xlink:type="arc"/>

<link:label id="lab_us-gaap_Assets_BC6B9D7F05C5B26B6187378564DB07BE_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_BC6B9D7F05C5B26B6187378564DB07BE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> TOTAL ASSETS </link:label>

<link:label id="lab_us-gaap_Assets_BC6B9D7F05C5B26B6187378564DB07BE_label_en-US" xlink:label="lab_us-gaap_Assets_BC6B9D7F05C5B26B6187378564DB07BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_BC6B9D7F05C5B26B6187378564DB07BE" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_884296CE573DEAFF1B2B378564DB84D4_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_884296CE573DEAFF1B2B378564DB84D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> LIABILITIES AND STOCKHOLDERS’ EQUITY </link:label>

<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_884296CE573DEAFF1B2B378564DB84D4_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_884296CE573DEAFF1B2B378564DB84D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_884296CE573DEAFF1B2B378564DB84D4" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_787C74135EF7EB0D3D36378564DB7F47_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_787C74135EF7EB0D3D36378564DB7F47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current liabilities: </link:label>

<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_787C74135EF7EB0D3D36378564DB7F47_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_787C74135EF7EB0D3D36378564DB7F47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_787C74135EF7EB0D3D36378564DB7F47" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_787C74135EF7EB0D3D36378564DB7F47" xlink:to="lab_us-gaap_LiabilitiesCurrentAbstract_787C74135EF7EB0D3D36378564DB7F47" xlink:type="arc"/>

<link:label id="lab_tgen_NotesPayableandLineofCreditRelatedPartiesCurrent_BCA041D7591ACBC23D8B378564DB7570_terseLabel_en-US" xlink:label="lab_tgen_NotesPayableandLineofCreditRelatedPartiesCurrent_BCA041D7591ACBC23D8B378564DB7570" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving line of credit, bank </link:label>

<link:label id="lab_tgen_NotesPayableandLineofCreditRelatedPartiesCurrent_BCA041D7591ACBC23D8B378564DB7570_label_en-US" xlink:label="lab_tgen_NotesPayableandLineofCreditRelatedPartiesCurrent_BCA041D7591ACBC23D8B378564DB7570" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Notes Payable and Line of Credit, Related Parties, Current </link:label>

<link:label id="lab_tgen_NotesPayableandLineofCreditRelatedPartiesCurrent_BCA041D7591ACBC23D8B378564DB7570_documentation_en-US" xlink:label="lab_tgen_NotesPayableandLineofCreditRelatedPartiesCurrent_BCA041D7591ACBC23D8B378564DB7570" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Notes Payable and Line of Credit, Related Parties, Current </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_NotesPayableandLineofCreditRelatedPartiesCurrent" xlink:label="loc_tgen_NotesPayableandLineofCreditRelatedPartiesCurrent_BCA041D7591ACBC23D8B378564DB7570" xlink:type="locator"/>

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<link:label id="lab_us-gaap_AccountsPayableCurrent_7782414547697BAA5BA8378564DBFB03_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_7782414547697BAA5BA8378564DBFB03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable </link:label>

<link:label id="lab_us-gaap_AccountsPayableCurrent_7782414547697BAA5BA8378564DBFB03_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_7782414547697BAA5BA8378564DBFB03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_7782414547697BAA5BA8378564DBFB03" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableCurrent_7782414547697BAA5BA8378564DBFB03" xlink:to="lab_us-gaap_AccountsPayableCurrent_7782414547697BAA5BA8378564DBFB03" xlink:type="arc"/>

<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_90CEC871897FAD2928D9378564DB084F_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_90CEC871897FAD2928D9378564DB084F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued expenses </link:label>

<link:label id="lab_us-gaap_AccruedLiabilitiesCurrent_90CEC871897FAD2928D9378564DB084F_label_en-US" xlink:label="lab_us-gaap_AccruedLiabilitiesCurrent_90CEC871897FAD2928D9378564DB084F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accrued Liabilities, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_90CEC871897FAD2928D9378564DB084F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_90CEC871897FAD2928D9378564DB084F" xlink:to="lab_us-gaap_AccruedLiabilitiesCurrent_90CEC871897FAD2928D9378564DB084F" xlink:type="arc"/>

<link:label id="lab_us-gaap_DeferredRevenueCurrent_7BAE86D6BFD75CD47E07378564DBEB66_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_7BAE86D6BFD75CD47E07378564DBEB66" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue </link:label>

<link:label id="lab_us-gaap_DeferredRevenueCurrent_7BAE86D6BFD75CD47E07378564DBEB66_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_7BAE86D6BFD75CD47E07378564DBEB66" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_7BAE86D6BFD75CD47E07378564DBEB66" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherLiabilitiesCurrent_0471ADB6455DE8255E44378564DBF0A3_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_0471ADB6455DE8255E44378564DBF0A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease obligations, current </link:label>

<link:label id="lab_us-gaap_OtherLiabilitiesCurrent_0471ADB6455DE8255E44378564DBF0A3_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_0471ADB6455DE8255E44378564DBF0A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_0471ADB6455DE8255E44378564DBF0A3" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LiabilitiesCurrent_F577F51FD88860D7CD40378564DB7BBD_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_F577F51FD88860D7CD40378564DB7BBD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current liabilities </link:label>

<link:label id="lab_us-gaap_LiabilitiesCurrent_F577F51FD88860D7CD40378564DB7BBD_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_F577F51FD88860D7CD40378564DB7BBD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_F577F51FD88860D7CD40378564DB7BBD" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LiabilitiesNoncurrentAbstract_CCBFEE52D6C6336FFE3C378564DB2D2F_label_en-US" xlink:label="lab_us-gaap_LiabilitiesNoncurrentAbstract_CCBFEE52D6C6336FFE3C378564DB2D2F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Noncurrent [Abstract] </link:label>

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<link:label id="lab_us-gaap_DeferredRevenueNoncurrent_913FB3DCF2C44A02E94A378564DB4B1C_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueNoncurrent_913FB3DCF2C44A02E94A378564DB4B1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue, Noncurrent </link:label>

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<link:label id="lab_us-gaap_StockholdersEquityAbstract_63E386C8C764FAAFF96A378564DBADC9_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_63E386C8C764FAAFF96A378564DBADC9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Tecogen Inc. shareholders’ equity: </link:label>

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<link:label id="lab_us-gaap_MinorityInterest_D97D59E66CA531B0DC77378564DB94D6_terseLabel_en-US" xlink:label="lab_us-gaap_MinorityInterest_D97D59E66CA531B0DC77378564DB94D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Noncontrolling interest </link:label>

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<link:label id="lab_us-gaap_TitleOfIndividualAxis_465E0491DEF226C1F73F6D622F087224_terseLabel_en-US" xlink:label="lab_us-gaap_TitleOfIndividualAxis_465E0491DEF226C1F73F6D622F087224" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Title of Individual [Axis] </link:label>

<link:label id="lab_us-gaap_TitleOfIndividualAxis_465E0491DEF226C1F73F6D622F087224_label_en-US" xlink:label="lab_us-gaap_TitleOfIndividualAxis_465E0491DEF226C1F73F6D622F087224" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Title of Individual [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TitleOfIndividualAxis" xlink:label="loc_us-gaap_TitleOfIndividualAxis_465E0491DEF226C1F73F6D622F087224" xlink:type="locator"/>

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<link:label id="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_F95DB5AB416CA39F24046D622F08A9DF_terseLabel_en-US" xlink:label="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_F95DB5AB416CA39F24046D622F08A9DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Relationship to Entity [Domain] </link:label>

<link:label id="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_F95DB5AB416CA39F24046D622F08A9DF_label_en-US" xlink:label="lab_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_F95DB5AB416CA39F24046D622F08A9DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Relationship to Entity [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_F95DB5AB416CA39F24046D622F08A9DF" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ChiefExecutiveOfficerMember_425129938FD522E759AC6D622F08A894_verboseLabel_en-US" xlink:label="lab_us-gaap_ChiefExecutiveOfficerMember_425129938FD522E759AC6D622F08A894" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Co-Chief Executive Officer </link:label>

<link:label id="lab_us-gaap_ChiefExecutiveOfficerMember_425129938FD522E759AC6D622F08A894_label_en-US" xlink:label="lab_us-gaap_ChiefExecutiveOfficerMember_425129938FD522E759AC6D622F08A894" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Chief Executive Officer [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ChiefExecutiveOfficerMember" xlink:label="loc_us-gaap_ChiefExecutiveOfficerMember_425129938FD522E759AC6D622F08A894" xlink:type="locator"/>

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<link:label id="lab_srt_CounterpartyNameAxis_DF52ED76B193D670A00E6D622F0807F6_terseLabel_en-US" xlink:label="lab_srt_CounterpartyNameAxis_DF52ED76B193D670A00E6D622F0807F6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Counterparty Name [Axis] </link:label>

<link:label id="lab_srt_CounterpartyNameAxis_DF52ED76B193D670A00E6D622F0807F6_label_en-US" xlink:label="lab_srt_CounterpartyNameAxis_DF52ED76B193D670A00E6D622F0807F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Counterparty Name [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_CounterpartyNameAxis" xlink:label="loc_srt_CounterpartyNameAxis_DF52ED76B193D670A00E6D622F0807F6" xlink:type="locator"/>

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<link:label id="lab_srt_RepurchaseAgreementCounterpartyNameDomain_FA7A3E66119CBC0E8D076D622F080694_terseLabel_en-US" xlink:label="lab_srt_RepurchaseAgreementCounterpartyNameDomain_FA7A3E66119CBC0E8D076D622F080694" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Counterparty Name [Domain] </link:label>

<link:label id="lab_srt_RepurchaseAgreementCounterpartyNameDomain_FA7A3E66119CBC0E8D076D622F080694_label_en-US" xlink:label="lab_srt_RepurchaseAgreementCounterpartyNameDomain_FA7A3E66119CBC0E8D076D622F080694" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Counterparty Name [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_FA7A3E66119CBC0E8D076D622F080694" xlink:type="locator"/>

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<link:label id="lab_tgen_Tedoma.s.Member_CD3C2A37B7363CDE41046D622F088604_terseLabel_en-US" xlink:label="lab_tgen_Tedoma.s.Member_CD3C2A37B7363CDE41046D622F088604" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Tedom a.s. </link:label>

<link:label id="lab_tgen_Tedoma.s.Member_CD3C2A37B7363CDE41046D622F088604_label_en-US" xlink:label="lab_tgen_Tedoma.s.Member_CD3C2A37B7363CDE41046D622F088604" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Tedom a.s. [Member] </link:label>

<link:label id="lab_tgen_Tedoma.s.Member_CD3C2A37B7363CDE41046D622F088604_documentation_en-US" xlink:label="lab_tgen_Tedoma.s.Member_CD3C2A37B7363CDE41046D622F088604" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Tedom a.s. [Member] </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_Tedoma.s.Member" xlink:label="loc_tgen_Tedoma.s.Member_CD3C2A37B7363CDE41046D622F088604" xlink:type="locator"/>

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<link:label id="lab_tgen_TedomUSAMember_90CD15E797EC8DD75CCF6D622F08A865_terseLabel_en-US" xlink:label="lab_tgen_TedomUSAMember_90CD15E797EC8DD75CCF6D622F08A865" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Tedom USA </link:label>

<link:label id="lab_tgen_TedomUSAMember_90CD15E797EC8DD75CCF6D622F08A865_label_en-US" xlink:label="lab_tgen_TedomUSAMember_90CD15E797EC8DD75CCF6D622F08A865" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Tedom USA [Member] </link:label>

<link:label id="lab_tgen_TedomUSAMember_90CD15E797EC8DD75CCF6D622F08A865_documentation_en-US" xlink:label="lab_tgen_TedomUSAMember_90CD15E797EC8DD75CCF6D622F08A865" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Tedom USA [Member] </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_TedomUSAMember" xlink:label="loc_tgen_TedomUSAMember_90CD15E797EC8DD75CCF6D622F08A865" xlink:type="locator"/>

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<link:label id="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_56FACF21A00650D895CF6D622F087FF6_terseLabel_en-US" xlink:label="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_56FACF21A00650D895CF6D622F087FF6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Investment, Name [Axis] </link:label>

<link:label id="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_56FACF21A00650D895CF6D622F087FF6_label_en-US" xlink:label="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_56FACF21A00650D895CF6D622F087FF6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Investment, Name [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_56FACF21A00650D895CF6D622F087FF6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_56FACF21A00650D895CF6D622F087FF6" xlink:to="lab_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_56FACF21A00650D895CF6D622F087FF6" xlink:type="arc"/>

<link:label id="lab_srt_EquityMethodInvesteeNameDomain_12F4DA6AA8F4032AA9176D622F08F2A8_terseLabel_en-US" xlink:label="lab_srt_EquityMethodInvesteeNameDomain_12F4DA6AA8F4032AA9176D622F08F2A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Investment, Name [Domain] </link:label>

<link:label id="lab_srt_EquityMethodInvesteeNameDomain_12F4DA6AA8F4032AA9176D622F08F2A8_label_en-US" xlink:label="lab_srt_EquityMethodInvesteeNameDomain_12F4DA6AA8F4032AA9176D622F08F2A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Investment, Name [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_EquityMethodInvesteeNameDomain" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_12F4DA6AA8F4032AA9176D622F08F2A8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_12F4DA6AA8F4032AA9176D622F08F2A8" xlink:to="lab_srt_EquityMethodInvesteeNameDomain_12F4DA6AA8F4032AA9176D622F08F2A8" xlink:type="arc"/>

<link:label id="lab_tgen_TTcogenLLCMember_E2AF8BBF6BC73A379E526D622F08BF1D_terseLabel_en-US" xlink:label="lab_tgen_TTcogenLLCMember_E2AF8BBF6BC73A379E526D622F08BF1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> TTcogen, LLC </link:label>

<link:label id="lab_tgen_TTcogenLLCMember_E2AF8BBF6BC73A379E526D622F08BF1D_label_en-US" xlink:label="lab_tgen_TTcogenLLCMember_E2AF8BBF6BC73A379E526D622F08BF1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> TTcogen, LLC [Member] </link:label>

<link:label id="lab_tgen_TTcogenLLCMember_E2AF8BBF6BC73A379E526D622F08BF1D_documentation_en-US" xlink:label="lab_tgen_TTcogenLLCMember_E2AF8BBF6BC73A379E526D622F08BF1D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> TTcogen, LLC [Member] </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_TTcogenLLCMember" xlink:label="loc_tgen_TTcogenLLCMember_E2AF8BBF6BC73A379E526D622F08BF1D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_TTcogenLLCMember_E2AF8BBF6BC73A379E526D622F08BF1D" xlink:to="lab_tgen_TTcogenLLCMember_E2AF8BBF6BC73A379E526D622F08BF1D" xlink:type="arc"/>

<link:label id="lab_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_CFA199603358B0B464066D622F08C8F2_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_CFA199603358B0B464066D622F08C8F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Equity Method Investments [Line Items] </link:label>

<link:label id="lab_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_CFA199603358B0B464066D622F08C8F2_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_CFA199603358B0B464066D622F08C8F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Equity Method Investments [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_CFA199603358B0B464066D622F08C8F2" xlink:type="locator"/>

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<link:label id="lab_us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent_B7C68102E6C6EDC888936D622F083917_terseLabel_en-US" xlink:label="lab_us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent_B7C68102E6C6EDC888936D622F083917" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Loan from related party </link:label>

<link:label id="lab_us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent_B7C68102E6C6EDC888936D622F083917_label_en-US" xlink:label="lab_us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent_B7C68102E6C6EDC888936D622F083917" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Notes Payable, Related Parties </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent_B7C68102E6C6EDC888936D622F083917" xlink:type="locator"/>

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<link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_0E0F0991BEF89E6FBC826D622F0875B9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_0E0F0991BEF89E6FBC826D622F0875B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stated interest rate (percent) </link:label>

<link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_0E0F0991BEF89E6FBC826D622F0875B9_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_0E0F0991BEF89E6FBC826D622F0875B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Interest Rate, Stated Percentage </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0E0F0991BEF89E6FBC826D622F0875B9" xlink:type="locator"/>

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<link:label id="lab_us-gaap_RepaymentsOfRelatedPartyDebt_7840A64B4331372367F26D622F080E84_terseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfRelatedPartyDebt_7840A64B4331372367F26D622F080E84" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Repayment of loan </link:label>

<link:label id="lab_us-gaap_RepaymentsOfRelatedPartyDebt_7840A64B4331372367F26D622F080E84_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfRelatedPartyDebt_7840A64B4331372367F26D622F080E84" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Repayments of Related Party Debt </link:label>

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<link:label id="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage_23C493A8178C5CA68D516D622F089E2B_terseLabel_en-US" xlink:label="lab_us-gaap_EquityMethodInvestmentOwnershipPercentage_23C493A8178C5CA68D516D622F089E2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equity interest in joint venture (percent) </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_23C493A8178C5CA68D516D622F089E2B" xlink:type="locator"/>

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<link:label id="lab_tgen_InitialPaymenttoAcquireProductiveAssets_C38F99083D8D4EAD6F896D622F0859AC_terseLabel_en-US" xlink:label="lab_tgen_InitialPaymenttoAcquireProductiveAssets_C38F99083D8D4EAD6F896D622F0859AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Initial payment to acquire Tedom USA's membership interest in TTcogen </link:label>

<link:label id="lab_tgen_InitialPaymenttoAcquireProductiveAssets_C38F99083D8D4EAD6F896D622F0859AC_label_en-US" xlink:label="lab_tgen_InitialPaymenttoAcquireProductiveAssets_C38F99083D8D4EAD6F896D622F0859AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Initial Payment to Acquire Productive Assets </link:label>

<link:label id="lab_tgen_InitialPaymenttoAcquireProductiveAssets_C38F99083D8D4EAD6F896D622F0859AC_documentation_en-US" xlink:label="lab_tgen_InitialPaymenttoAcquireProductiveAssets_C38F99083D8D4EAD6F896D622F0859AC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Initial Payment to Acquire Productive Assets </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_InitialPaymenttoAcquireProductiveAssets" xlink:label="loc_tgen_InitialPaymenttoAcquireProductiveAssets_C38F99083D8D4EAD6F896D622F0859AC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_InitialPaymenttoAcquireProductiveAssets_C38F99083D8D4EAD6F896D622F0859AC" xlink:to="lab_tgen_InitialPaymenttoAcquireProductiveAssets_C38F99083D8D4EAD6F896D622F0859AC" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsToAcquireEquityMethodInvestments_BEE3E0F2E80E22F2F0226D622F08CAC1_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireEquityMethodInvestments_BEE3E0F2E80E22F2F0226D622F08CAC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payment to acquire Tedom USA'a initial investment in TTcogen, minus certain adjustments </link:label>

<link:label id="lab_us-gaap_PaymentsToAcquireEquityMethodInvestments_BEE3E0F2E80E22F2F0226D622F08CAC1_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireEquityMethodInvestments_BEE3E0F2E80E22F2F0226D622F08CAC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Equity Method Investments </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_BEE3E0F2E80E22F2F0226D622F08CAC1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_BEE3E0F2E80E22F2F0226D622F08CAC1" xlink:to="lab_us-gaap_PaymentsToAcquireEquityMethodInvestments_BEE3E0F2E80E22F2F0226D622F08CAC1" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsToAcquireProductiveAssets_69002CC8ACF2805541E86D622F087F33_terseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireProductiveAssets_69002CC8ACF2805541E86D622F087F33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payment for acquisition of assets </link:label>

<link:label id="lab_us-gaap_PaymentsToAcquireProductiveAssets_69002CC8ACF2805541E86D622F087F33_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireProductiveAssets_69002CC8ACF2805541E86D622F087F33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Productive Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_69002CC8ACF2805541E86D622F087F33" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireProductiveAssets_69002CC8ACF2805541E86D622F087F33" xlink:to="lab_us-gaap_PaymentsToAcquireProductiveAssets_69002CC8ACF2805541E86D622F087F33" xlink:type="arc"/>

<link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_6854EF2CC577CFEBBEFB3785649DD886_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_6854EF2CC577CFEBBEFB3785649DD886" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Cash Flows [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_6854EF2CC577CFEBBEFB3785649DD886" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_6854EF2CC577CFEBBEFB3785649DD886" xlink:to="lab_us-gaap_StatementOfCashFlowsAbstract_6854EF2CC577CFEBBEFB3785649DD886" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4AC76622A59AD67DDB3B3785649DE817_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4AC76622A59AD67DDB3B3785649DE817" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> CASH FLOWS FROM OPERATING ACTIVITIES: </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4AC76622A59AD67DDB3B3785649DE817_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4AC76622A59AD67DDB3B3785649DE817" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4AC76622A59AD67DDB3B3785649DE817" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4AC76622A59AD67DDB3B3785649DE817" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4AC76622A59AD67DDB3B3785649DE817" xlink:type="arc"/>

<link:label id="lab_us-gaap_ProfitLoss_3A939D9126C5DED355F73785649DD9D3_terseLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_3A939D9126C5DED355F73785649DD9D3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Consolidated net loss </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_3A939D9126C5DED355F73785649DD9D3" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProfitLoss_3A939D9126C5DED355F73785649DD9D3" xlink:to="lab_us-gaap_ProfitLoss_3A939D9126C5DED355F73785649DD9D3" xlink:type="arc"/>

<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E57CC7C348601FBF474D3785649D816E_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E57CC7C348601FBF474D3785649D816E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to reconcile net loss to net cash used in operating activities: </link:label>

<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E57CC7C348601FBF474D3785649D816E_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E57CC7C348601FBF474D3785649D816E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E57CC7C348601FBF474D3785649D816E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E57CC7C348601FBF474D3785649D816E" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_E57CC7C348601FBF474D3785649D816E" xlink:type="arc"/>

<link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_0338EE3CA2B6226BEA823785649D25D0_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_0338EE3CA2B6226BEA823785649D25D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Depreciation, accretion and amortization, net </link:label>

<link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_0338EE3CA2B6226BEA823785649D25D0_label_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_0338EE3CA2B6226BEA823785649D25D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Depreciation, Depletion and Amortization </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_0338EE3CA2B6226BEA823785649D25D0" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DepreciationDepletionAndAmortization_0338EE3CA2B6226BEA823785649D25D0" xlink:to="lab_us-gaap_DepreciationDepletionAndAmortization_0338EE3CA2B6226BEA823785649D25D0" xlink:type="arc"/>

<link:label id="lab_us-gaap_GainLossOnContractTermination_92DFEE3E689A269465E03785649D695E_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnContractTermination_92DFEE3E689A269465E03785649D695E" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Gain on contract termination </link:label>

<link:label id="lab_us-gaap_GainLossOnContractTermination_92DFEE3E689A269465E03785649D695E_label_en-US" xlink:label="lab_us-gaap_GainLossOnContractTermination_92DFEE3E689A269465E03785649D695E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gain (Loss) on Contract Termination </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnContractTermination" xlink:label="loc_us-gaap_GainLossOnContractTermination_92DFEE3E689A269465E03785649D695E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnContractTermination_92DFEE3E689A269465E03785649D695E" xlink:to="lab_us-gaap_GainLossOnContractTermination_92DFEE3E689A269465E03785649D695E" xlink:type="arc"/>

<link:label id="lab_tgen_ProvisionForRecoveryFromInventoryValuationReserves_4BF806165556D25C44B03785649D5F26_terseLabel_en-US" xlink:label="lab_tgen_ProvisionForRecoveryFromInventoryValuationReserves_4BF806165556D25C44B03785649D5F26" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Provision on inventory reserve </link:label>

<link:label id="lab_tgen_ProvisionForRecoveryFromInventoryValuationReserves_4BF806165556D25C44B03785649D5F26_label_en-US" xlink:label="lab_tgen_ProvisionForRecoveryFromInventoryValuationReserves_4BF806165556D25C44B03785649D5F26" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Provision for (Recovery from) Inventory Valuation Reserves </link:label>

<link:label id="lab_tgen_ProvisionForRecoveryFromInventoryValuationReserves_4BF806165556D25C44B03785649D5F26_documentation_en-US" xlink:label="lab_tgen_ProvisionForRecoveryFromInventoryValuationReserves_4BF806165556D25C44B03785649D5F26" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Provision for (Recovery from) Inventory Valuation Reserves </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_ProvisionForRecoveryFromInventoryValuationReserves" xlink:label="loc_tgen_ProvisionForRecoveryFromInventoryValuationReserves_4BF806165556D25C44B03785649D5F26" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_ProvisionForRecoveryFromInventoryValuationReserves_4BF806165556D25C44B03785649D5F26" xlink:to="lab_tgen_ProvisionForRecoveryFromInventoryValuationReserves_4BF806165556D25C44B03785649D5F26" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensation_3D851F6F545007F6024C3785649D9796_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_3D851F6F545007F6024C3785649D9796" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensation_3D851F6F545007F6024C3785649D9796_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_3D851F6F545007F6024C3785649D9796" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_3D851F6F545007F6024C3785649D9796" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_3D851F6F545007F6024C3785649D9796" xlink:to="lab_us-gaap_ShareBasedCompensation_3D851F6F545007F6024C3785649D9796" xlink:type="arc"/>

<link:label id="lab_us-gaap_OtherNoncashIncomeExpense_DEE1820773441263D1123785649D9CEA_negatedLabel_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_DEE1820773441263D1123785649D9CEA" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Goodwill impairment </link:label>

<link:label id="lab_us-gaap_OtherNoncashIncomeExpense_DEE1820773441263D1123785649D9CEA_label_en-US" xlink:label="lab_us-gaap_OtherNoncashIncomeExpense_DEE1820773441263D1123785649D9CEA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Noncash Income (Expense) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_DEE1820773441263D1123785649D9CEA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNoncashIncomeExpense_DEE1820773441263D1123785649D9CEA" xlink:to="lab_us-gaap_OtherNoncashIncomeExpense_DEE1820773441263D1123785649D9CEA" xlink:type="arc"/>

<link:label id="lab_us-gaap_GainLossOnDispositionOfAssets1_81499DF7B54D0D7BD8333785649D8879_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets1_81499DF7B54D0D7BD8333785649D8879" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> (Gain) loss on sale of assets </link:label>

<link:label id="lab_us-gaap_GainLossOnDispositionOfAssets1_81499DF7B54D0D7BD8333785649D8879_label_en-US" xlink:label="lab_us-gaap_GainLossOnDispositionOfAssets1_81499DF7B54D0D7BD8333785649D8879" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gain (Loss) on Disposition of Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets1" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_81499DF7B54D0D7BD8333785649D8879" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnDispositionOfAssets1_81499DF7B54D0D7BD8333785649D8879" xlink:to="lab_us-gaap_GainLossOnDispositionOfAssets1_81499DF7B54D0D7BD8333785649D8879" xlink:type="arc"/>

<link:label id="lab_us-gaap_GainLossOnSaleOfOtherAssets_282ECECAB77751CE39533785649D9B6E_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfOtherAssets_282ECECAB77751CE39533785649D9B6E" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> (Gain) loss on sale of assets </link:label>

<link:label id="lab_us-gaap_GainLossOnSaleOfOtherAssets_282ECECAB77751CE39533785649D9B6E_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfOtherAssets_282ECECAB77751CE39533785649D9B6E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gain (Loss) on Disposition of Other Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfOtherAssets" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherAssets_282ECECAB77751CE39533785649D9B6E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSaleOfOtherAssets_282ECECAB77751CE39533785649D9B6E" xlink:to="lab_us-gaap_GainLossOnSaleOfOtherAssets_282ECECAB77751CE39533785649D9B6E" xlink:type="arc"/>

<link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_C6FFAD66F56907039D003785649D45B2_terseLabel_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_C6FFAD66F56907039D003785649D45B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Provision for losses on accounts receivable </link:label>

<link:label id="lab_us-gaap_ProvisionForDoubtfulAccounts_C6FFAD66F56907039D003785649D45B2_label_en-US" xlink:label="lab_us-gaap_ProvisionForDoubtfulAccounts_C6FFAD66F56907039D003785649D45B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Provision for Doubtful Accounts </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_C6FFAD66F56907039D003785649D45B2" xlink:type="locator"/>

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<link:label id="lab_tgen_NoncashInterestExpense_47FCB49DD279540B3AD73785649DD9B8_terseLabel_en-US" xlink:label="lab_tgen_NoncashInterestExpense_47FCB49DD279540B3AD73785649DD9B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-cash interest expense </link:label>

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<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_EF16D4F403493B9688DC3785649D2426_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_EF16D4F403493B9688DC3785649D2426" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Changes in operating assets and liabilities, net of effects of acquisitions </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_EF16D4F403493B9688DC3785649D2426_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_EF16D4F403493B9688DC3785649D2426" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Operating Assets [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingAssetsAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_EF16D4F403493B9688DC3785649D2426" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_2A231AD69E46ED4D3D503785649DBE82_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_2A231AD69E46ED4D3D503785649DBE82" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Accounts receivable </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_2A231AD69E46ED4D3D503785649DBE82_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_2A231AD69E46ED4D3D503785649DBE82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Receivable </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_2A231AD69E46ED4D3D503785649DBE82" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings_3299F3420A028030C6283785649D0224_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings_3299F3420A028030C6283785649D0224" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unbilled revenue </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings_3299F3420A028030C6283785649D0224_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings_3299F3420A028030C6283785649D0224" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Billing in Excess of Cost of Earnings </link:label>

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<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_4F018FDCAED686A7ECBC3785649DBFA5_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_4F018FDCAED686A7ECBC3785649DBFA5" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Inventory </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInInventories_4F018FDCAED686A7ECBC3785649DBFA5_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_4F018FDCAED686A7ECBC3785649DBFA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Inventories </link:label>

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<link:label id="lab_us-gaap_IncreaseDecreaseInDueFromRelatedParties_9EE633B3B5FD5D9DE2B23785649D58CF_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDueFromRelatedParties_9EE633B3B5FD5D9DE2B23785649D58CF" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Due from related party </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInDueFromRelatedParties_9EE633B3B5FD5D9DE2B23785649D58CF_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDueFromRelatedParties_9EE633B3B5FD5D9DE2B23785649D58CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Due from Related Parties </link:label>

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<link:label id="lab_tgen_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_06C900DDD488353935693785649D8271_negatedTerseLabel_en-US" xlink:label="lab_tgen_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_06C900DDD488353935693785649D8271" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid expenses and other current assets </link:label>

<link:label id="lab_tgen_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_06C900DDD488353935693785649D8271_label_en-US" xlink:label="lab_tgen_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_06C900DDD488353935693785649D8271" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Prepaid Expense and Other Current Assets </link:label>

<link:label id="lab_tgen_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_06C900DDD488353935693785649D8271_documentation_en-US" xlink:label="lab_tgen_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_06C900DDD488353935693785649D8271" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Prepaid Expense and Other Current Assets </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets" xlink:label="loc_tgen_IncreaseDecreaseInPrepaidExpenseAndOtherCurrentAssets_06C900DDD488353935693785649D8271" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_0331350DAC6099DFF7343785649D095A_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_0331350DAC6099DFF7343785649D095A" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Other non-current assets </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_0331350DAC6099DFF7343785649D095A_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_0331350DAC6099DFF7343785649D095A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Other Operating Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_0331350DAC6099DFF7343785649D095A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_6ED823802177A5A83B8B3785649D6886_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_6ED823802177A5A83B8B3785649D6886" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increase (decrease) in: </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_6ED823802177A5A83B8B3785649D6886_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_6ED823802177A5A83B8B3785649D6886" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Operating Liabilities [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_6ED823802177A5A83B8B3785649D6886" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_9E4EBE8F39321E74B8ED3785649DE4BF_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_9E4EBE8F39321E74B8ED3785649DE4BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_9E4EBE8F39321E74B8ED3785649DE4BF_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_9E4EBE8F39321E74B8ED3785649DE4BF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Payable </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_9E4EBE8F39321E74B8ED3785649DE4BF" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_61462A18386C86B4BDE33785649DCFB6_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_61462A18386C86B4BDE33785649DCFB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued expenses and other current liabilities </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_61462A18386C86B4BDE33785649DCFB6" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_F98F9F113BAF7AD73F7A3785649D1A36_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_F98F9F113BAF7AD73F7A3785649D1A36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue </link:label>

<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_F98F9F113BAF7AD73F7A3785649D1A36_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_F98F9F113BAF7AD73F7A3785649D1A36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Deferred Revenue </link:label>

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<link:label id="lab_tgen_IncreaseDecreaseInInterestPayableRelatedParty_641A5ECBFC93E10B12EB3785649D39EC_terseLabel_en-US" xlink:label="lab_tgen_IncreaseDecreaseInInterestPayableRelatedParty_641A5ECBFC93E10B12EB3785649D39EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest payable, related party </link:label>

<link:label id="lab_tgen_IncreaseDecreaseInInterestPayableRelatedParty_641A5ECBFC93E10B12EB3785649D39EC_label_en-US" xlink:label="lab_tgen_IncreaseDecreaseInInterestPayableRelatedParty_641A5ECBFC93E10B12EB3785649D39EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Interest Payable, Related Party </link:label>

<link:label id="lab_tgen_IncreaseDecreaseInInterestPayableRelatedParty_641A5ECBFC93E10B12EB3785649D39EC_documentation_en-US" xlink:label="lab_tgen_IncreaseDecreaseInInterestPayableRelatedParty_641A5ECBFC93E10B12EB3785649D39EC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Interest Payable, Related Party </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_IncreaseDecreaseInInterestPayableRelatedParty" xlink:label="loc_tgen_IncreaseDecreaseInInterestPayableRelatedParty_641A5ECBFC93E10B12EB3785649D39EC" xlink:type="locator"/>

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<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_2BB4CDC88771BCFC15D33785649D3724_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_2BB4CDC88771BCFC15D33785649D3724" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash used in operating activities </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_2BB4CDC88771BCFC15D33785649D3724" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_2BB4CDC88771BCFC15D33785649D3724" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_2BB4CDC88771BCFC15D33785649D3724" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_45A233887ED0648B035C3785649D0549_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_45A233887ED0648B035C3785649D0549" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> CASH FLOWS FROM INVESTING ACTIVITIES: </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_45A233887ED0648B035C3785649D0549_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_45A233887ED0648B035C3785649D0549" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_45A233887ED0648B035C3785649D0549" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_45A233887ED0648B035C3785649D0549" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_45A233887ED0648B035C3785649D0549" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D570989F990E1FD2B67D3785649D6246_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D570989F990E1FD2B67D3785649D6246" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Purchases of property and equipment </link:label>

<link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D570989F990E1FD2B67D3785649D6246_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D570989F990E1FD2B67D3785649D6246" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Property, Plant, and Equipment </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D570989F990E1FD2B67D3785649D6246" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D570989F990E1FD2B67D3785649D6246" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_D570989F990E1FD2B67D3785649D6246" xlink:type="arc"/>

<link:label id="lab_us-gaap_ProceedsFromSaleOfOtherProductiveAssets_307D93B7E3BA9E58F7953785649DC848_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfOtherProductiveAssets_307D93B7E3BA9E58F7953785649DC848" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from sale of assets </link:label>

<link:label id="lab_us-gaap_ProceedsFromSaleOfOtherProductiveAssets_307D93B7E3BA9E58F7953785649DC848_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfOtherProductiveAssets_307D93B7E3BA9E58F7953785649DC848" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Sale of Other Productive Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromSaleOfOtherProductiveAssets" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherProductiveAssets_307D93B7E3BA9E58F7953785649DC848" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleOfOtherProductiveAssets_307D93B7E3BA9E58F7953785649DC848" xlink:to="lab_us-gaap_ProceedsFromSaleOfOtherProductiveAssets_307D93B7E3BA9E58F7953785649DC848" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsToAcquireIntangibleAssets_5CAD4E35F72BB50AF1283785649D80FC_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireIntangibleAssets_5CAD4E35F72BB50AF1283785649D80FC" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Purchases of intangible assets </link:label>

<link:label id="lab_us-gaap_PaymentsToAcquireIntangibleAssets_5CAD4E35F72BB50AF1283785649D80FC_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireIntangibleAssets_5CAD4E35F72BB50AF1283785649D80FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Intangible Assets </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_5CAD4E35F72BB50AF1283785649D80FC" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireIntangibleAssets_5CAD4E35F72BB50AF1283785649D80FC" xlink:to="lab_us-gaap_PaymentsToAcquireIntangibleAssets_5CAD4E35F72BB50AF1283785649D80FC" xlink:type="arc"/>

<link:label id="lab_us-gaap_CashAcquiredFromAcquisition_4EA53FCF0D5CA7DC456C3785649D0829_terseLabel_en-US" xlink:label="lab_us-gaap_CashAcquiredFromAcquisition_4EA53FCF0D5CA7DC456C3785649D0829" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash acquired in asset acquisition </link:label>

<link:label id="lab_us-gaap_CashAcquiredFromAcquisition_4EA53FCF0D5CA7DC456C3785649D0829_label_en-US" xlink:label="lab_us-gaap_CashAcquiredFromAcquisition_4EA53FCF0D5CA7DC456C3785649D0829" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash Acquired from Acquisition </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CashAcquiredFromAcquisition" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_4EA53FCF0D5CA7DC456C3785649D0829" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAcquiredFromAcquisition_4EA53FCF0D5CA7DC456C3785649D0829" xlink:to="lab_us-gaap_CashAcquiredFromAcquisition_4EA53FCF0D5CA7DC456C3785649D0829" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsToAcquireLongtermInvestments_1B0EBA4FF5EE113A003B3785649DE919_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireLongtermInvestments_1B0EBA4FF5EE113A003B3785649DE919" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Expenses associated with asset acquisition </link:label>

<link:label id="lab_us-gaap_PaymentsToAcquireLongtermInvestments_1B0EBA4FF5EE113A003B3785649DE919_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireLongtermInvestments_1B0EBA4FF5EE113A003B3785649DE919" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Long-term Investments </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireLongtermInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireLongtermInvestments_1B0EBA4FF5EE113A003B3785649DE919" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireLongtermInvestments_1B0EBA4FF5EE113A003B3785649DE919" xlink:to="lab_us-gaap_PaymentsToAcquireLongtermInvestments_1B0EBA4FF5EE113A003B3785649DE919" xlink:type="arc"/>

<link:label id="lab_tgen_PaymentofStockIssuanceCostsAcquisition_6A459C5BC1C8566164EF3785649D100F_negatedLabel_en-US" xlink:label="lab_tgen_PaymentofStockIssuanceCostsAcquisition_6A459C5BC1C8566164EF3785649D100F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Payment of stock issuance costs </link:label>

<link:label id="lab_tgen_PaymentofStockIssuanceCostsAcquisition_6A459C5BC1C8566164EF3785649D100F_label_en-US" xlink:label="lab_tgen_PaymentofStockIssuanceCostsAcquisition_6A459C5BC1C8566164EF3785649D100F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payment of Stock Issuance Costs, Acquisition </link:label>

<link:label id="lab_tgen_PaymentofStockIssuanceCostsAcquisition_6A459C5BC1C8566164EF3785649D100F_documentation_en-US" xlink:label="lab_tgen_PaymentofStockIssuanceCostsAcquisition_6A459C5BC1C8566164EF3785649D100F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Payment of Stock Issuance Costs, Acquisition </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_PaymentofStockIssuanceCostsAcquisition" xlink:label="loc_tgen_PaymentofStockIssuanceCostsAcquisition_6A459C5BC1C8566164EF3785649D100F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_PaymentofStockIssuanceCostsAcquisition_6A459C5BC1C8566164EF3785649D100F" xlink:to="lab_tgen_PaymentofStockIssuanceCostsAcquisition_6A459C5BC1C8566164EF3785649D100F" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsToMinorityShareholders_DACD5C2239C998F39BF53785649D0972_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToMinorityShareholders_DACD5C2239C998F39BF53785649D0972" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Distributions to noncontrolling interest </link:label>

<link:label id="lab_us-gaap_PaymentsToMinorityShareholders_DACD5C2239C998F39BF53785649D0972_label_en-US" xlink:label="lab_us-gaap_PaymentsToMinorityShareholders_DACD5C2239C998F39BF53785649D0972" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Noncontrolling Interests </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToMinorityShareholders" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_DACD5C2239C998F39BF53785649D0972" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToMinorityShareholders_DACD5C2239C998F39BF53785649D0972" xlink:to="lab_us-gaap_PaymentsToMinorityShareholders_DACD5C2239C998F39BF53785649D0972" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_BD4FBA873FB7D293A37A3785649D2DF4_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_BD4FBA873FB7D293A37A3785649D2DF4" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by (used in) investing activities </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_BD4FBA873FB7D293A37A3785649D2DF4_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_BD4FBA873FB7D293A37A3785649D2DF4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_BD4FBA873FB7D293A37A3785649D2DF4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_BD4FBA873FB7D293A37A3785649D2DF4" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_BD4FBA873FB7D293A37A3785649D2DF4" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5D9C355FFBBE150221043785649D8B31_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5D9C355FFBBE150221043785649D8B31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> CASH FLOWS FROM FINANCING ACTIVITIES: </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5D9C355FFBBE150221043785649D8B31_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5D9C355FFBBE150221043785649D8B31" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5D9C355FFBBE150221043785649D8B31" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5D9C355FFBBE150221043785649D8B31" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_5D9C355FFBBE150221043785649D8B31" xlink:type="arc"/>

<link:label id="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_1641A79F23FAFC3E7FF03785649DB26C_negatedLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_1641A79F23FAFC3E7FF03785649DB26C" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Proceeds (payments) on revolving line of credit, net </link:label>

<link:label id="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_1641A79F23FAFC3E7FF03785649DB26C_label_en-US" xlink:label="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_1641A79F23FAFC3E7FF03785649DB26C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from (Repayments of) Lines of Credit </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_1641A79F23FAFC3E7FF03785649DB26C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_1641A79F23FAFC3E7FF03785649DB26C" xlink:to="lab_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_1641A79F23FAFC3E7FF03785649DB26C" xlink:type="arc"/>

<link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_99FBB4C6455ACD75B1223785649DBE16_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_99FBB4C6455ACD75B1223785649DBE16" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Payments for debt issuance costs </link:label>

<link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_99FBB4C6455ACD75B1223785649DBE16_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_99FBB4C6455ACD75B1223785649DBE16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments of Debt Issuance Costs </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_99FBB4C6455ACD75B1223785649DBE16" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfDebtIssuanceCosts_99FBB4C6455ACD75B1223785649DBE16" xlink:to="lab_us-gaap_PaymentsOfDebtIssuanceCosts_99FBB4C6455ACD75B1223785649DBE16" xlink:type="arc"/>

<link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_16F904B8F57E1B8141083785649D081C_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_16F904B8F57E1B8141083785649D081C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from the exercise of stock options </link:label>

<link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_16F904B8F57E1B8141083785649D081C_label_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_16F904B8F57E1B8141083785649D081C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Stock Options Exercised </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_16F904B8F57E1B8141083785649D081C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromStockOptionsExercised_16F904B8F57E1B8141083785649D081C" xlink:to="lab_us-gaap_ProceedsFromStockOptionsExercised_16F904B8F57E1B8141083785649D081C" xlink:type="arc"/>

<link:label id="lab_us-gaap_RepaymentsOfRelatedPartyDebt_B4C52DF13EFBB847EB253785649D08FA_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfRelatedPartyDebt_B4C52DF13EFBB847EB253785649D08FA" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Payment on loan due to related party </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RepaymentsOfRelatedPartyDebt" xlink:label="loc_us-gaap_RepaymentsOfRelatedPartyDebt_B4C52DF13EFBB847EB253785649D08FA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepaymentsOfRelatedPartyDebt_B4C52DF13EFBB847EB253785649D08FA" xlink:to="lab_us-gaap_RepaymentsOfRelatedPartyDebt_B4C52DF13EFBB847EB253785649D08FA" xlink:type="arc"/>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_0778798C8D850453E7DE3785649DE1DD_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_0778798C8D850453E7DE3785649DE1DD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net cash provided by (used in) financing activities </link:label>

<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_0778798C8D850453E7DE3785649DE1DD_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_0778798C8D850453E7DE3785649DE1DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_0778798C8D850453E7DE3785649DE1DD" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_26A8F7F8515DD41877073785649D7971_terseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_26A8F7F8515DD41877073785649D7971" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-cash investing and financing activities: </link:label>

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<link:label id="lab_us-gaap_InterestPaidNet_78CFA896B615D26459FB37A699847992_label_en-US" xlink:label="lab_us-gaap_InterestPaidNet_78CFA896B615D26459FB37A699847992" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Paid, Excluding Capitalized Interest, Operating Activities </link:label>

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<link:label id="lab_us-gaap_AccountingPoliciesAbstract_664B425F3E5D2397A2036D622FF2C1CF_label_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract_664B425F3E5D2397A2036D622FF2C1CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounting Policies [Abstract] </link:label>

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<link:label id="lab_tgen_PrinciplesOfConsolidationAndBasisOfPresentationPolicyTextBlock_543EB1CAD00768A7BE0B6D622FF22166_terseLabel_en-US" xlink:label="lab_tgen_PrinciplesOfConsolidationAndBasisOfPresentationPolicyTextBlock_543EB1CAD00768A7BE0B6D622FF22166" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Principles of Consolidation and Basis of Presentation </link:label>

<link:label id="lab_tgen_PrinciplesOfConsolidationAndBasisOfPresentationPolicyTextBlock_543EB1CAD00768A7BE0B6D622FF22166_label_en-US" xlink:label="lab_tgen_PrinciplesOfConsolidationAndBasisOfPresentationPolicyTextBlock_543EB1CAD00768A7BE0B6D622FF22166" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Principles Of Consolidation and Basis Of Presentation [Policy Text Block] </link:label>

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<link:label id="lab_us-gaap_UseOfEstimates_437FF809051FDB05D96C6D622FF244E9_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_437FF809051FDB05D96C6D622FF244E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Use of Estimates </link:label>

<link:label id="lab_us-gaap_UseOfEstimates_437FF809051FDB05D96C6D622FF244E9_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_437FF809051FDB05D96C6D622FF244E9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Use of Estimates, Policy [Policy Text Block] </link:label>

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<link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_8D09F307A19689F8C8FC6D622FF22692_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_8D09F307A19689F8C8FC6D622FF22692" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Taxes </link:label>

<link:label id="lab_us-gaap_IncomeTaxPolicyTextBlock_8D09F307A19689F8C8FC6D622FF22692_label_en-US" xlink:label="lab_us-gaap_IncomeTaxPolicyTextBlock_8D09F307A19689F8C8FC6D622FF22692" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax, Policy [Policy Text Block] </link:label>

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<link:label id="lab_us-gaap_FairValueDisclosuresAbstract_678A618DE9451B802D506D622EE9B9B0_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract_678A618DE9451B802D506D622EE9B9B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Disclosures [Abstract] </link:label>

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<link:label id="lab_tgen_EurositePowerIncMember_E632FCAD8A7D1E30FB8F6D622EE9CD11_terseLabel_en-US" xlink:label="lab_tgen_EurositePowerIncMember_E632FCAD8A7D1E30FB8F6D622EE9CD11" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Eurosite Power Inc </link:label>

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<link:label id="lab_us-gaap_FairValueDisclosureItemAmountsDomain_21D1E510A3BACAD4FFF66D622EE9C61E_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosureItemAmountsDomain_21D1E510A3BACAD4FFF66D622EE9C61E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Measurement [Domain] </link:label>

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<link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_A2695D3B5FA4BBE496496D622EE98150_label_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis_A2695D3B5FA4BBE496496D622EE98150" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Measurement Frequency [Axis] </link:label>

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<link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_273C238D293169C8928F6D622EE948F1_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain_273C238D293169C8928F6D622EE948F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, Measurement Frequency [Domain] </link:label>

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<link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_2EF5FCE86DE95FFC6D1E6D622EE97E7A_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember_2EF5FCE86DE95FFC6D1E6D622EE97E7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, Measurements, Recurring </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_2EF5FCE86DE95FFC6D1E6D622EE97E7A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_7837939B1DCF4A7500146D622EE95EE2_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_7837939B1DCF4A7500146D622EE95EE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Axis] </link:label>

<link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_7837939B1DCF4A7500146D622EE95EE2_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_7837939B1DCF4A7500146D622EE95EE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7837939B1DCF4A7500146D622EE95EE2" xlink:type="locator"/>

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<link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5A89A23255EB80EDED5D6D622EE991E0_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5A89A23255EB80EDED5D6D622EE991E0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Domain] </link:label>

<link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5A89A23255EB80EDED5D6D622EE991E0_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5A89A23255EB80EDED5D6D622EE991E0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5A89A23255EB80EDED5D6D622EE991E0" xlink:type="locator"/>

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<link:label id="lab_us-gaap_FairValueInputsLevel1Member_069F68E4222B643141AA6D622EE90823_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_069F68E4222B643141AA6D622EE90823" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Level 1 </link:label>

<link:label id="lab_us-gaap_FairValueInputsLevel1Member_069F68E4222B643141AA6D622EE90823_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_069F68E4222B643141AA6D622EE90823" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 1 [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_069F68E4222B643141AA6D622EE90823" xlink:type="locator"/>

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<link:label id="lab_us-gaap_FairValueInputsLevel2Member_B41E4A92B2CA9FAC767B6D622EE99396_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_B41E4A92B2CA9FAC767B6D622EE99396" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Level 2 </link:label>

<link:label id="lab_us-gaap_FairValueInputsLevel2Member_B41E4A92B2CA9FAC767B6D622EE99396_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_B41E4A92B2CA9FAC767B6D622EE99396" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 2 [Member] </link:label>

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<link:label id="lab_us-gaap_FairValueInputsLevel3Member_877445AD2BDDABC76A326D622EE951BE_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_877445AD2BDDABC76A326D622EE951BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Level 3 </link:label>

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<link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_522C8BDEB73EE6FA17216D622EE9BF8B_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_522C8BDEB73EE6FA17216D622EE9BF8B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] </link:label>

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<link:label id="lab_us-gaap_AvailableForSaleSecuritiesEquitySecurities_207714B136F010AD62346D622EE9724F_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesEquitySecurities_207714B136F010AD62346D622EE9724F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Available-for-sale equity securities </link:label>

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<link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_BCCDC32BA59FFA65ECCC6D623002D2E7_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_BCCDC32BA59FFA65ECCC6D623002D2E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, par value </link:label>

<link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_BCCDC32BA59FFA65ECCC6D623002D2E7_label_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_BCCDC32BA59FFA65ECCC6D623002D2E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Par or Stated Value Per Share </link:label>

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<link:label id="lab_us-gaap_CommonStockSharesAuthorized_1469CA7FF8F36EE934936D62300268EA_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_1469CA7FF8F36EE934936D62300268EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares Authorized </link:label>

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<link:label id="lab_us-gaap_CommonStockSharesIssued_AC1E83B44843F393E5956D623002FCEE_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_AC1E83B44843F393E5956D623002FCEE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares, Issued </link:label>

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<link:label id="lab_us-gaap_CommonStockSharesOutstanding_1C2FB5D1CF313CDF7F6D6D623002CB24_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_1C2FB5D1CF313CDF7F6D6D623002CB24" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, shares outstanding </link:label>

<link:label id="lab_us-gaap_CommonStockSharesOutstanding_1C2FB5D1CF313CDF7F6D6D623002CB24_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_1C2FB5D1CF313CDF7F6D6D623002CB24" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares, Outstanding </link:label>

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<link:label id="lab_us-gaap_IncomeStatementAbstract_48A2B006767D05F97115378564BCAD0C_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_48A2B006767D05F97115378564BCAD0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement [Abstract] </link:label>

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<link:label id="lab_srt_ProductOrServiceAxis_F0631AAD810C1C3DA2B2378564BC4E22_label_en-US" xlink:label="lab_srt_ProductOrServiceAxis_F0631AAD810C1C3DA2B2378564BC4E22" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product and Service [Axis] </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_38DC247137EFC85EC261378564BCAEF6" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ProductMember_4A5DB54674E12BC70879378564BC5B6F_terseLabel_en-US" xlink:label="lab_us-gaap_ProductMember_4A5DB54674E12BC70879378564BC5B6F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Products </link:label>

<link:label id="lab_us-gaap_ProductMember_4A5DB54674E12BC70879378564BC5B6F_label_en-US" xlink:label="lab_us-gaap_ProductMember_4A5DB54674E12BC70879378564BC5B6F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Product [Member] </link:label>

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<link:label id="lab_us-gaap_ServiceMember_A383A1E93D9CBD5DE4DE378564BC10F4_terseLabel_en-US" xlink:label="lab_us-gaap_ServiceMember_A383A1E93D9CBD5DE4DE378564BC10F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Services </link:label>

<link:label id="lab_us-gaap_ServiceMember_A383A1E93D9CBD5DE4DE378564BC10F4_label_en-US" xlink:label="lab_us-gaap_ServiceMember_A383A1E93D9CBD5DE4DE378564BC10F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Service [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ServiceMember" xlink:label="loc_us-gaap_ServiceMember_A383A1E93D9CBD5DE4DE378564BC10F4" xlink:type="locator"/>

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<link:label id="lab_us-gaap_EnergyServiceMember_1BFEB87E1DF16982BBBF378564BC12B3_terseLabel_en-US" xlink:label="lab_us-gaap_EnergyServiceMember_1BFEB87E1DF16982BBBF378564BC12B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Energy production </link:label>

<link:label id="lab_us-gaap_EnergyServiceMember_1BFEB87E1DF16982BBBF378564BC12B3_label_en-US" xlink:label="lab_us-gaap_EnergyServiceMember_1BFEB87E1DF16982BBBF378564BC12B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Energy Service [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EnergyServiceMember" xlink:label="loc_us-gaap_EnergyServiceMember_1BFEB87E1DF16982BBBF378564BC12B3" xlink:type="locator"/>

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<link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_359805760E8367CD3DA2378564BC8A0F_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_359805760E8367CD3DA2378564BC8A0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total revenues </link:label>

<link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_359805760E8367CD3DA2378564BC8A0F_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_359805760E8367CD3DA2378564BC8A0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue from Contract with Customer, Excluding Assessed Tax </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_359805760E8367CD3DA2378564BC8A0F" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_F4F5842ECFBFCE2B6C16378564BC1B70_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_F4F5842ECFBFCE2B6C16378564BC1B70" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total cost of sales </link:label>

<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_F4F5842ECFBFCE2B6C16378564BC1B70_label_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_F4F5842ECFBFCE2B6C16378564BC1B70" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Goods and Services Sold </link:label>

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<link:label id="lab_us-gaap_GrossProfit_F983CF9C5287991B1E38378564BCD41B_totalLabel_en-US" xlink:label="lab_us-gaap_GrossProfit_F983CF9C5287991B1E38378564BCD41B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Gross profit </link:label>

<link:label id="lab_us-gaap_GrossProfit_F983CF9C5287991B1E38378564BCD41B_label_en-US" xlink:label="lab_us-gaap_GrossProfit_F983CF9C5287991B1E38378564BCD41B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gross Profit </link:label>

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<link:label id="lab_us-gaap_SellingExpense_A0B3970A901A896195CA378564BC11F8_terseLabel_en-US" xlink:label="lab_us-gaap_SellingExpense_A0B3970A901A896195CA378564BC11F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Selling </link:label>

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<link:label id="lab_us-gaap_GoodwillImpairmentLoss_C30ADEC8AE406C5A1CE0378564BCED25_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss_C30ADEC8AE406C5A1CE0378564BCED25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill impairment </link:label>

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<link:label id="lab_us-gaap_OperatingIncomeLoss_EDF136C1EA8B6BF0A23C378564BC1A0F_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_EDF136C1EA8B6BF0A23C378564BC1A0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Income (Loss) </link:label>

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<link:label id="lab_us-gaap_OtherIncomeAndExpensesAbstract_65C97EEB8271AB26ABB2378564BC0DC1_terseLabel_en-US" xlink:label="lab_us-gaap_OtherIncomeAndExpensesAbstract_65C97EEB8271AB26ABB2378564BC0DC1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other income (expense) </link:label>

<link:label id="lab_us-gaap_OtherIncomeAndExpensesAbstract_65C97EEB8271AB26ABB2378564BC0DC1_label_en-US" xlink:label="lab_us-gaap_OtherIncomeAndExpensesAbstract_65C97EEB8271AB26ABB2378564BC0DC1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Income and Expenses [Abstract] </link:label>

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<link:label id="lab_tgen_InterestandOtherIncomeExpense_ED219136C8F337CABED1378564BC0B02_terseLabel_en-US" xlink:label="lab_tgen_InterestandOtherIncomeExpense_ED219136C8F337CABED1378564BC0B02" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest income </link:label>

<link:label id="lab_tgen_InterestandOtherIncomeExpense_ED219136C8F337CABED1378564BC0B02_label_en-US" xlink:label="lab_tgen_InterestandOtherIncomeExpense_ED219136C8F337CABED1378564BC0B02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest and Other Income (Expense) </link:label>

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<link:label id="lab_us-gaap_InterestExpense_A0B38AE5E52ED7FCC39A378564BC6645_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_InterestExpense_A0B38AE5E52ED7FCC39A378564BC6645" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Interest expense </link:label>

<link:label id="lab_us-gaap_InterestExpense_A0B38AE5E52ED7FCC39A378564BC6645_label_en-US" xlink:label="lab_us-gaap_InterestExpense_A0B38AE5E52ED7FCC39A378564BC6645" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Expense </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_A0B38AE5E52ED7FCC39A378564BC6645" xlink:type="locator"/>

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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_DB3BD3FCA9D8D877EA40378564BCBE1E_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_DB3BD3FCA9D8D877EA40378564BCBE1E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unrealized gain (loss) on investment securities </link:label>

<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_DB3BD3FCA9D8D877EA40378564BCBE1E_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_DB3BD3FCA9D8D877EA40378564BCBE1E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_DB3BD3FCA9D8D877EA40378564BCBE1E" xlink:type="locator"/>

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<link:label id="lab_us-gaap_InterestIncomeExpenseNet_358E3D8517299556F5FB378564BC8A32_totalLabel_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNet_358E3D8517299556F5FB378564BC8A32" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total other income (expense), net </link:label>

<link:label id="lab_us-gaap_InterestIncomeExpenseNet_358E3D8517299556F5FB378564BC8A32_label_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNet_358E3D8517299556F5FB378564BC8A32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Income (Expense), Net </link:label>

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<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_E4C2359C43B5DB047D34378564BC533A_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_E4C2359C43B5DB047D34378564BC533A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Loss before provision for state income taxes </link:label>

<link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_E4C2359C43B5DB047D34378564BC533A_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_E4C2359C43B5DB047D34378564BC533A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest </link:label>

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<link:label id="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_6BEFAF27CAFAC336AB01378564BCA727_terseLabel_en-US" xlink:label="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_6BEFAF27CAFAC336AB01378564BCA727" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Provision for state income taxes </link:label>

<link:label id="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_6BEFAF27CAFAC336AB01378564BCA727_label_en-US" xlink:label="lab_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_6BEFAF27CAFAC336AB01378564BCA727" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Current State and Local Tax Expense (Benefit) </link:label>

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<link:label id="lab_us-gaap_ProfitLoss_65C48EBEFC611B2824E1378564BCC738_totalLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_65C48EBEFC611B2824E1378564BCC738" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Consolidated net loss </link:label>

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<link:label id="lab_us-gaap_NetIncomeLoss_5CD6F8F88E303ED3BDAF378564BCF1C8_totalLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_5CD6F8F88E303ED3BDAF378564BCF1C8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net loss attributable to Tecogen Inc. </link:label>

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<link:label id="lab_us-gaap_EarningsPerShareBasicAndDiluted_9E13E9F66D689A08067C378564BCAC9F_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDiluted_9E13E9F66D689A08067C378564BCAC9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basic loss per share </link:label>

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<link:label id="lab_us-gaap_DisaggregationOfRevenueTable_DA222B6052BABDBB45686D6230114794_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTable_DA222B6052BABDBB45686D6230114794" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue [Table] </link:label>

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<link:label id="lab_srt_ConsolidationItemsDomain_0D6AEDF7518568D0CF426D6230116E2B_label_en-US" xlink:label="lab_srt_ConsolidationItemsDomain_0D6AEDF7518568D0CF426D6230116E2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Consolidation Items [Domain] </link:label>

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<link:label id="lab_srt_ParentCompanyMember_EAB43400DCEC785AE094378564104A0B_label_en-US" xlink:label="lab_srt_ParentCompanyMember_EAB43400DCEC785AE094378564104A0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Parent Company [Member] </link:label>

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<link:label id="lab_us-gaap_PlanNameAxis_7E6D43448DFF30205FC7378564104590_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis_7E6D43448DFF30205FC7378564104590" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>

<link:label id="lab_us-gaap_PlanNameAxis_7E6D43448DFF30205FC7378564104590_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis_7E6D43448DFF30205FC7378564104590" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_7E6D43448DFF30205FC7378564104590" xlink:type="locator"/>

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<link:label id="lab_us-gaap_PlanNameDomain_F8D7962988241E30A6D837856410C592_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameDomain_F8D7962988241E30A6D837856410C592" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>

<link:label id="lab_us-gaap_PlanNameDomain_F8D7962988241E30A6D837856410C592_label_en-US" xlink:label="lab_us-gaap_PlanNameDomain_F8D7962988241E30A6D837856410C592" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_F8D7962988241E30A6D837856410C592" xlink:type="locator"/>

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<link:label id="lab_tgen_AmendedStockOptionandIncentivePlan2006Member_EA229BA892306D55377C378564101393_terseLabel_en-US" xlink:label="lab_tgen_AmendedStockOptionandIncentivePlan2006Member_EA229BA892306D55377C378564101393" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amended Plan </link:label>

<link:label id="lab_tgen_AmendedStockOptionandIncentivePlan2006Member_EA229BA892306D55377C378564101393_label_en-US" xlink:label="lab_tgen_AmendedStockOptionandIncentivePlan2006Member_EA229BA892306D55377C378564101393" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amended Stock Option and Incentive Plan 2006 [Member] </link:label>

<link:label id="lab_tgen_AmendedStockOptionandIncentivePlan2006Member_EA229BA892306D55377C378564101393_documentation_en-US" xlink:label="lab_tgen_AmendedStockOptionandIncentivePlan2006Member_EA229BA892306D55377C378564101393" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Amended 2006 Stock Option and Incentive Plan [Member] </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_AmendedStockOptionandIncentivePlan2006Member" xlink:label="loc_tgen_AmendedStockOptionandIncentivePlan2006Member_EA229BA892306D55377C378564101393" xlink:type="locator"/>

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<link:label id="lab_us-gaap_AwardTypeAxis_1F1DCE63CEEFC23B85A6378564108429_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_1F1DCE63CEEFC23B85A6378564108429" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>

<link:label id="lab_us-gaap_AwardTypeAxis_1F1DCE63CEEFC23B85A6378564108429_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_1F1DCE63CEEFC23B85A6378564108429" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_1F1DCE63CEEFC23B85A6378564108429" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56F1E21AE939A157A9B837856410F132_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56F1E21AE939A157A9B837856410F132" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Domain] </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56F1E21AE939A157A9B837856410F132_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56F1E21AE939A157A9B837856410F132" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity Award [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_56F1E21AE939A157A9B837856410F132" xlink:type="locator"/>

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<link:label id="lab_us-gaap_EmployeeStockOptionMember_079B09E37955B40A165F3785641074F2_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember_079B09E37955B40A165F3785641074F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock Options </link:label>

<link:label id="lab_us-gaap_EmployeeStockOptionMember_079B09E37955B40A165F3785641074F2_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember_079B09E37955B40A165F3785641074F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee Stock Option [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_079B09E37955B40A165F3785641074F2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeStockOptionMember_079B09E37955B40A165F3785641074F2" xlink:to="lab_us-gaap_EmployeeStockOptionMember_079B09E37955B40A165F3785641074F2" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48F3807D3B8E2F76A667378564107DB9_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48F3807D3B8E2F76A667378564107DB9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48F3807D3B8E2F76A667378564107DB9_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48F3807D3B8E2F76A667378564107DB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_48F3807D3B8E2F76A667378564107DB9" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_50A5AA1C9035DA23AB0B37856410D665_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_50A5AA1C9035DA23AB0B37856410D665" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Shares of common stock reserved for future issuance </link:label>

<link:label id="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_50A5AA1C9035DA23AB0B37856410D665_label_en-US" xlink:label="lab_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_50A5AA1C9035DA23AB0B37856410D665" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Capital Shares Reserved for Future Issuance </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_50A5AA1C9035DA23AB0B37856410D665" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_9E0C27DA7463F112A79237856410CEC7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_9E0C27DA7463F112A79237856410CEC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of shares remaining available for future issuance </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_9E0C27DA7463F112A79237856410CEC7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_9E0C27DA7463F112A79237856410CEC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_9E0C27DA7463F112A79237856410CEC7" xlink:type="locator"/>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_EEE0BF5FC9674974E96637856410AB8A" xlink:type="locator"/>

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<link:label id="lab_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_B9F70DE33C38B1F8621F3785642FDFC0_label_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_B9F70DE33C38B1F8621F3785642FDFC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Discontinued Operations and Disposal Groups [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract" xlink:label="loc_us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract_B9F70DE33C38B1F8621F3785642FDFC0" xlink:type="locator"/>

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<link:label id="lab_tgen_NumberofSalesofEnergyProducingAssets_202BB9A0FDB0621048363785642F7B30_terseLabel_en-US" xlink:label="lab_tgen_NumberofSalesofEnergyProducingAssets_202BB9A0FDB0621048363785642F7B30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of sales of energy producing assets </link:label>

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<link:loc xlink:href="tgen-20190930.xsd#tgen_NumberofSalesofEnergyProducingAssets" xlink:label="loc_tgen_NumberofSalesofEnergyProducingAssets_202BB9A0FDB0621048363785642F7B30" xlink:type="locator"/>

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<link:label id="lab_tgen_NumberofEnergyProducingSitesSold_355AD64B021E0EFAF6203785642F0544_terseLabel_en-US" xlink:label="lab_tgen_NumberofEnergyProducingSitesSold_355AD64B021E0EFAF6203785642F0544" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of energy producing sites sold </link:label>

<link:label id="lab_tgen_NumberofEnergyProducingSitesSold_355AD64B021E0EFAF6203785642F0544_label_en-US" xlink:label="lab_tgen_NumberofEnergyProducingSitesSold_355AD64B021E0EFAF6203785642F0544" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of Energy Producing Sites Sold </link:label>

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<link:label id="lab_us-gaap_ProceedsFromSaleOfProductiveAssets_3016C18F73C1897F99A53785642F1044_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfProductiveAssets_3016C18F73C1897F99A53785642F1044" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Consideration received </link:label>

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<link:label id="lab_tgen_PercentageOfOwnedJointVenture_203A424D36BF4E25A74D377E7B177392_label_en-US" xlink:label="lab_tgen_PercentageOfOwnedJointVenture_203A424D36BF4E25A74D377E7B177392" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Percentage Of Owned Joint Venture </link:label>

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<link:label id="lab_us-gaap_NumberOfOperatingSegments_8C4C8CE1A7B6B1D0CBCB377E7B178E5C_verboseLabel_en-US" xlink:label="lab_us-gaap_NumberOfOperatingSegments_8C4C8CE1A7B6B1D0CBCB377E7B178E5C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Number of business segments </link:label>

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<link:label id="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_962854B26D365F6159766D622F669610_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_962854B26D365F6159766D622F669610" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue </link:label>

<link:label id="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_962854B26D365F6159766D622F669610_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueTableTextBlock_962854B26D365F6159766D622F669610" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue [Table Text Block] </link:label>

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<link:label id="lab_tgen_DepreciationDepletionandAmortizationPropertyPlantandEquipment_AA6BCE72C186AA14941D6D622EC92536_terseLabel_en-US" xlink:label="lab_tgen_DepreciationDepletionandAmortizationPropertyPlantandEquipment_AA6BCE72C186AA14941D6D622EC92536" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Depreciation and amortization expense </link:label>

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<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_29AFD12EB63C30603BF06D62301171C7_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_29AFD12EB63C30603BF06D62301171C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Stock Option Activity </link:label>

<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_29AFD12EB63C30603BF06D62301171C7_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_29AFD12EB63C30603BF06D62301171C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation, Stock Options, Activity [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_29AFD12EB63C30603BF06D62301171C7" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_2492104206B11FE42A276D623021A9E9_terseLabel_en-US" xlink:label="lab_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_2492104206B11FE42A276D623021A9E9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Indefinite-lived Intangible Assets [Axis] </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_2492104206B11FE42A276D623021A9E9" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_609A3088508E4D064FD86D6230216B0C_terseLabel_en-US" xlink:label="lab_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_609A3088508E4D064FD86D6230216B0C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Indefinite-lived Intangible Assets, Major Class Name [Domain] </link:label>

<link:label id="lab_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_609A3088508E4D064FD86D6230216B0C_label_en-US" xlink:label="lab_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_609A3088508E4D064FD86D6230216B0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Indefinite-lived Intangible Assets, Major Class Name [Domain] </link:label>

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<link:label id="lab_us-gaap_TrademarksMember_2C0A8311C23F77E844FA6D623021EEB0_terseLabel_en-US" xlink:label="lab_us-gaap_TrademarksMember_2C0A8311C23F77E844FA6D623021EEB0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Trademarks </link:label>

<link:label id="lab_us-gaap_TrademarksMember_2C0A8311C23F77E844FA6D623021EEB0_label_en-US" xlink:label="lab_us-gaap_TrademarksMember_2C0A8311C23F77E844FA6D623021EEB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Trademarks [Member] </link:label>

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<link:label id="lab_us-gaap_InProcessResearchAndDevelopmentMember_34BB65136E3173C52F2A6D623021E5BF_terseLabel_en-US" xlink:label="lab_us-gaap_InProcessResearchAndDevelopmentMember_34BB65136E3173C52F2A6D623021E5BF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> In Process R&D </link:label>

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<link:label id="lab_tgen_ProductCertificationMember_4B576B7B5CAE39C3CD236D62302199DF_terseLabel_en-US" xlink:label="lab_tgen_ProductCertificationMember_4B576B7B5CAE39C3CD236D62302199DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Product Certifications </link:label>

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<link:label id="lab_us-gaap_PatentsMember_4C4F4BCAFAC4DBF21CDB6D62302116F0_terseLabel_en-US" xlink:label="lab_us-gaap_PatentsMember_4C4F4BCAFAC4DBF21CDB6D62302116F0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Patents </link:label>

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<link:label id="lab_us-gaap_DevelopedTechnologyRightsMember_C05F25A5DDEE530958836D623021B1D7_terseLabel_en-US" xlink:label="lab_us-gaap_DevelopedTechnologyRightsMember_C05F25A5DDEE530958836D623021B1D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Developed Technology </link:label>

<link:label id="lab_us-gaap_DevelopedTechnologyRightsMember_C05F25A5DDEE530958836D623021B1D7_label_en-US" xlink:label="lab_us-gaap_DevelopedTechnologyRightsMember_C05F25A5DDEE530958836D623021B1D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Developed Technology Rights [Member] </link:label>

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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DevelopedTechnologyRightsMember_C05F25A5DDEE530958836D623021B1D7" xlink:to="lab_us-gaap_DevelopedTechnologyRightsMember_C05F25A5DDEE530958836D623021B1D7" xlink:type="arc"/>

<link:label id="lab_us-gaap_ContractBasedIntangibleAssetsMember_3DAAD14DC2BF842E23BC6D623021397D_terseLabel_en-US" xlink:label="lab_us-gaap_ContractBasedIntangibleAssetsMember_3DAAD14DC2BF842E23BC6D623021397D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Favorable contract asset </link:label>

<link:label id="lab_us-gaap_ContractBasedIntangibleAssetsMember_3DAAD14DC2BF842E23BC6D623021397D_label_en-US" xlink:label="lab_us-gaap_ContractBasedIntangibleAssetsMember_3DAAD14DC2BF842E23BC6D623021397D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract-Based Intangible Assets [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractBasedIntangibleAssetsMember" xlink:label="loc_us-gaap_ContractBasedIntangibleAssetsMember_3DAAD14DC2BF842E23BC6D623021397D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractBasedIntangibleAssetsMember_3DAAD14DC2BF842E23BC6D623021397D" xlink:to="lab_us-gaap_ContractBasedIntangibleAssetsMember_3DAAD14DC2BF842E23BC6D623021397D" xlink:type="arc"/>

<link:label id="lab_tgen_TTcogenIntangibleAssetsMember_4F43E7ABA9E34DAE954B6D6230219E32_terseLabel_en-US" xlink:label="lab_tgen_TTcogenIntangibleAssetsMember_4F43E7ABA9E34DAE954B6D6230219E32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> TTcogen Intangible Assets </link:label>

<link:label id="lab_tgen_TTcogenIntangibleAssetsMember_4F43E7ABA9E34DAE954B6D6230219E32_label_en-US" xlink:label="lab_tgen_TTcogenIntangibleAssetsMember_4F43E7ABA9E34DAE954B6D6230219E32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> TTcogen Intangible Assets [Member] </link:label>

<link:label id="lab_tgen_TTcogenIntangibleAssetsMember_4F43E7ABA9E34DAE954B6D6230219E32_documentation_en-US" xlink:label="lab_tgen_TTcogenIntangibleAssetsMember_4F43E7ABA9E34DAE954B6D6230219E32" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> TTcogen Intangible Assets [Member] </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_TTcogenIntangibleAssetsMember" xlink:label="loc_tgen_TTcogenIntangibleAssetsMember_4F43E7ABA9E34DAE954B6D6230219E32" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_TTcogenIntangibleAssetsMember_4F43E7ABA9E34DAE954B6D6230219E32" xlink:to="lab_tgen_TTcogenIntangibleAssetsMember_4F43E7ABA9E34DAE954B6D6230219E32" xlink:type="arc"/>

<link:label id="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_57C113BD3709961F116E6D623021D2D5_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_57C113BD3709961F116E6D623021D2D5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intangible assets </link:label>

<link:label id="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_57C113BD3709961F116E6D623021D2D5_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_57C113BD3709961F116E6D623021D2D5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Intangible Assets, Gross (Excluding Goodwill) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_57C113BD3709961F116E6D623021D2D5" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_57C113BD3709961F116E6D623021D2D5" xlink:to="lab_us-gaap_IntangibleAssetsGrossExcludingGoodwill_57C113BD3709961F116E6D623021D2D5" xlink:type="arc"/>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CE9CFDC007F1C7A687396D6230214CD7_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CE9CFDC007F1C7A687396D6230214CD7" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less - accumulated amortization </link:label>

<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CE9CFDC007F1C7A687396D6230214CD7_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CE9CFDC007F1C7A687396D6230214CD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Accumulated Amortization </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CE9CFDC007F1C7A687396D6230214CD7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CE9CFDC007F1C7A687396D6230214CD7" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_CE9CFDC007F1C7A687396D6230214CD7" xlink:type="arc"/>

<link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_80FF1C781000CA40EDCA6D62302181D6_totalLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_80FF1C781000CA40EDCA6D62302181D6" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Intangible assets, net </link:label>

<link:label id="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_80FF1C781000CA40EDCA6D62302181D6_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_80FF1C781000CA40EDCA6D62302181D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Intangible Assets, Net (Excluding Goodwill) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_80FF1C781000CA40EDCA6D62302181D6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_80FF1C781000CA40EDCA6D62302181D6" xlink:to="lab_us-gaap_IntangibleAssetsNetExcludingGoodwill_80FF1C781000CA40EDCA6D62302181D6" xlink:type="arc"/>

<link:label id="lab_tgen_IntangibleLiabilityGross_7AAC8AFEFECE9246CACF6D623021D4D4_terseLabel_en-US" xlink:label="lab_tgen_IntangibleLiabilityGross_7AAC8AFEFECE9246CACF6D623021D4D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unfavorable contract liability </link:label>

<link:label id="lab_tgen_IntangibleLiabilityGross_7AAC8AFEFECE9246CACF6D623021D4D4_label_en-US" xlink:label="lab_tgen_IntangibleLiabilityGross_7AAC8AFEFECE9246CACF6D623021D4D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Intangible Liability, Gross </link:label>

<link:label id="lab_tgen_IntangibleLiabilityGross_7AAC8AFEFECE9246CACF6D623021D4D4_documentation_en-US" xlink:label="lab_tgen_IntangibleLiabilityGross_7AAC8AFEFECE9246CACF6D623021D4D4" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Intangible Liability, Gross </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_IntangibleLiabilityGross" xlink:label="loc_tgen_IntangibleLiabilityGross_7AAC8AFEFECE9246CACF6D623021D4D4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_IntangibleLiabilityGross_7AAC8AFEFECE9246CACF6D623021D4D4" xlink:to="lab_tgen_IntangibleLiabilityGross_7AAC8AFEFECE9246CACF6D623021D4D4" xlink:type="arc"/>

<link:label id="lab_tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_69F2395901DAFE9279336D623021B324_negatedTerseLabel_en-US" xlink:label="lab_tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_69F2395901DAFE9279336D623021B324" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less - accumulated amortization </link:label>

<link:label id="lab_tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_69F2395901DAFE9279336D623021B324_label_en-US" xlink:label="lab_tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_69F2395901DAFE9279336D623021B324" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Liabilities, Accumulated Amortization </link:label>

<link:label id="lab_tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_69F2395901DAFE9279336D623021B324_documentation_en-US" xlink:label="lab_tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_69F2395901DAFE9279336D623021B324" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Liabilities, Accumulated Amortization </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization" xlink:label="loc_tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_69F2395901DAFE9279336D623021B324" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_69F2395901DAFE9279336D623021B324" xlink:to="lab_tgen_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization_69F2395901DAFE9279336D623021B324" xlink:type="arc"/>

<link:label id="lab_tgen_IntangibleLiabilitiesNet_681B61E428ECFA6DC90C6D623021A821_totalLabel_en-US" xlink:label="lab_tgen_IntangibleLiabilitiesNet_681B61E428ECFA6DC90C6D623021A821" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Unfavorable contract liability, net </link:label>

<link:label id="lab_tgen_IntangibleLiabilitiesNet_681B61E428ECFA6DC90C6D623021A821_label_en-US" xlink:label="lab_tgen_IntangibleLiabilitiesNet_681B61E428ECFA6DC90C6D623021A821" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Intangible Liabilities, Net </link:label>

<link:label id="lab_tgen_IntangibleLiabilitiesNet_681B61E428ECFA6DC90C6D623021A821_documentation_en-US" xlink:label="lab_tgen_IntangibleLiabilitiesNet_681B61E428ECFA6DC90C6D623021A821" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Intangible Liabilities, Net </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_IntangibleLiabilitiesNet" xlink:label="loc_tgen_IntangibleLiabilitiesNet_681B61E428ECFA6DC90C6D623021A821" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_IntangibleLiabilitiesNet_681B61E428ECFA6DC90C6D623021A821" xlink:to="lab_tgen_IntangibleLiabilitiesNet_681B61E428ECFA6DC90C6D623021A821" xlink:type="arc"/>

<link:label id="lab_us-gaap_LeasesAbstract_AAC5DC2E9B8B1B004D6A6D622F661BCF_label_en-US" xlink:label="lab_us-gaap_LeasesAbstract_AAC5DC2E9B8B1B004D6A6D622F661BCF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Leases [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeasesAbstract" xlink:label="loc_us-gaap_LeasesAbstract_AAC5DC2E9B8B1B004D6A6D622F661BCF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeasesAbstract_AAC5DC2E9B8B1B004D6A6D622F661BCF" xlink:to="lab_us-gaap_LeasesAbstract_AAC5DC2E9B8B1B004D6A6D622F661BCF" xlink:type="arc"/>

<link:label id="lab_us-gaap_LeaseCostTableTextBlock_D6C86263315D99B419AF6D622F662450_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_D6C86263315D99B419AF6D622F662450" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Supplemental Information Related to Leases </link:label>

<link:label id="lab_us-gaap_LeaseCostTableTextBlock_D6C86263315D99B419AF6D622F662450_label_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_D6C86263315D99B419AF6D622F662450" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Cost [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeaseCostTableTextBlock" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_D6C86263315D99B419AF6D622F662450" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCostTableTextBlock_D6C86263315D99B419AF6D622F662450" xlink:to="lab_us-gaap_LeaseCostTableTextBlock_D6C86263315D99B419AF6D622F662450" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E4358D84804F7C6C385D6D622F668EAF_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E4358D84804F7C6C385D6D622F668EAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Future Minimum Lease Commitments </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E4358D84804F7C6C385D6D622F668EAF_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E4358D84804F7C6C385D6D622F668EAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Maturity [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E4358D84804F7C6C385D6D622F668EAF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E4358D84804F7C6C385D6D622F668EAF" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_E4358D84804F7C6C385D6D622F668EAF" xlink:type="arc"/>

<link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_F589BE0D0849D8EF87C86D622FF2A6B3_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_F589BE0D0849D8EF87C86D622FF2A6B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Segment Reporting Information </link:label>

<link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_F589BE0D0849D8EF87C86D622FF2A6B3_label_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_F589BE0D0849D8EF87C86D622FF2A6B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Segment Reporting Information, by Segment [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_F589BE0D0849D8EF87C86D622FF2A6B3" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_F589BE0D0849D8EF87C86D622FF2A6B3" xlink:to="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_F589BE0D0849D8EF87C86D622FF2A6B3" xlink:type="arc"/>

<link:label id="lab_us-gaap_SubsequentEventsAbstract_BBB8BD593E41FC858A146D622FA4239F_label_en-US" xlink:label="lab_us-gaap_SubsequentEventsAbstract_BBB8BD593E41FC858A146D622FA4239F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Events [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventsAbstract" xlink:label="loc_us-gaap_SubsequentEventsAbstract_BBB8BD593E41FC858A146D622FA4239F" xlink:type="locator"/>

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<link:label id="lab_us-gaap_SubsequentEventsTextBlock_2E45306BC87A35EB32546D622FA467AF_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock_2E45306BC87A35EB32546D622FA467AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Subsequent Events </link:label>

<link:label id="lab_us-gaap_SubsequentEventsTextBlock_2E45306BC87A35EB32546D622FA467AF_label_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock_2E45306BC87A35EB32546D622FA467AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Subsequent Events [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventsTextBlock" xlink:label="loc_us-gaap_SubsequentEventsTextBlock_2E45306BC87A35EB32546D622FA467AF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventsTextBlock_2E45306BC87A35EB32546D622FA467AF" xlink:to="lab_us-gaap_SubsequentEventsTextBlock_2E45306BC87A35EB32546D622FA467AF" xlink:type="arc"/>

<link:label id="lab_tgen_PaymentTermonProductSales_EF90654ECE28B958ABC26D62303150B3_terseLabel_en-US" xlink:label="lab_tgen_PaymentTermonProductSales_EF90654ECE28B958ABC26D62303150B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payment term on product sales </link:label>

<link:label id="lab_tgen_PaymentTermonProductSales_EF90654ECE28B958ABC26D62303150B3_label_en-US" xlink:label="lab_tgen_PaymentTermonProductSales_EF90654ECE28B958ABC26D62303150B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payment Term on Product Sales </link:label>

<link:label id="lab_tgen_PaymentTermonProductSales_EF90654ECE28B958ABC26D62303150B3_documentation_en-US" xlink:label="lab_tgen_PaymentTermonProductSales_EF90654ECE28B958ABC26D62303150B3" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Payment Term on Product Sales </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_PaymentTermonProductSales" xlink:label="loc_tgen_PaymentTermonProductSales_EF90654ECE28B958ABC26D62303150B3" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_PaymentTermonProductSales_EF90654ECE28B958ABC26D62303150B3" xlink:to="lab_tgen_PaymentTermonProductSales_EF90654ECE28B958ABC26D62303150B3" xlink:type="arc"/>

<link:label id="lab_tgen_PaymentTermonInstallationServices_8DDDEF2CD31DA648D89F6D6230312D75_terseLabel_en-US" xlink:label="lab_tgen_PaymentTermonInstallationServices_8DDDEF2CD31DA648D89F6D6230312D75" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payment term on installation services </link:label>

<link:label id="lab_tgen_PaymentTermonInstallationServices_8DDDEF2CD31DA648D89F6D6230312D75_label_en-US" xlink:label="lab_tgen_PaymentTermonInstallationServices_8DDDEF2CD31DA648D89F6D6230312D75" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payment Term on Installation Services </link:label>

<link:label id="lab_tgen_PaymentTermonInstallationServices_8DDDEF2CD31DA648D89F6D6230312D75_documentation_en-US" xlink:label="lab_tgen_PaymentTermonInstallationServices_8DDDEF2CD31DA648D89F6D6230312D75" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Payment Term on Installation Services </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_PaymentTermonInstallationServices" xlink:label="loc_tgen_PaymentTermonInstallationServices_8DDDEF2CD31DA648D89F6D6230312D75" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_PaymentTermonInstallationServices_8DDDEF2CD31DA648D89F6D6230312D75" xlink:to="lab_tgen_PaymentTermonInstallationServices_8DDDEF2CD31DA648D89F6D6230312D75" xlink:type="arc"/>

<link:label id="lab_tgen_PaymentTermonContractuallyDeterminedMilestones_20464F007223833579376D623031B1C1_terseLabel_en-US" xlink:label="lab_tgen_PaymentTermonContractuallyDeterminedMilestones_20464F007223833579376D623031B1C1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payment term on contractually determined milestones </link:label>

<link:label id="lab_tgen_PaymentTermonContractuallyDeterminedMilestones_20464F007223833579376D623031B1C1_label_en-US" xlink:label="lab_tgen_PaymentTermonContractuallyDeterminedMilestones_20464F007223833579376D623031B1C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payment Term on Contractually Determined Milestones </link:label>

<link:label id="lab_tgen_PaymentTermonContractuallyDeterminedMilestones_20464F007223833579376D623031B1C1_documentation_en-US" xlink:label="lab_tgen_PaymentTermonContractuallyDeterminedMilestones_20464F007223833579376D623031B1C1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Payment Term on Contractually Determined Milestones </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_PaymentTermonContractuallyDeterminedMilestones" xlink:label="loc_tgen_PaymentTermonContractuallyDeterminedMilestones_20464F007223833579376D623031B1C1" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_PaymentTermonContractuallyDeterminedMilestones_20464F007223833579376D623031B1C1" xlink:to="lab_tgen_PaymentTermonContractuallyDeterminedMilestones_20464F007223833579376D623031B1C1" xlink:type="arc"/>

<link:label id="lab_tgen_PaymentTermonEnergyProductionContractInvoices_9215BABAD3663616F28F6D62303153F2_terseLabel_en-US" xlink:label="lab_tgen_PaymentTermonEnergyProductionContractInvoices_9215BABAD3663616F28F6D62303153F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Payment term on energy production contract invoices </link:label>

<link:label id="lab_tgen_PaymentTermonEnergyProductionContractInvoices_9215BABAD3663616F28F6D62303153F2_label_en-US" xlink:label="lab_tgen_PaymentTermonEnergyProductionContractInvoices_9215BABAD3663616F28F6D62303153F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payment Term on Energy Production Contract Invoices </link:label>

<link:label id="lab_tgen_PaymentTermonEnergyProductionContractInvoices_9215BABAD3663616F28F6D62303153F2_documentation_en-US" xlink:label="lab_tgen_PaymentTermonEnergyProductionContractInvoices_9215BABAD3663616F28F6D62303153F2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Payment Term on Energy Production Contract Invoices </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_PaymentTermonEnergyProductionContractInvoices" xlink:label="loc_tgen_PaymentTermonEnergyProductionContractInvoices_9215BABAD3663616F28F6D62303153F2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_PaymentTermonEnergyProductionContractInvoices_9215BABAD3663616F28F6D62303153F2" xlink:to="lab_tgen_PaymentTermonEnergyProductionContractInvoices_9215BABAD3663616F28F6D62303153F2" xlink:type="arc"/>

<link:label id="lab_tgen_UnbilledRevenueRevenueRecognized_059516F1E442769D405E6D623031A88C_terseLabel_en-US" xlink:label="lab_tgen_UnbilledRevenueRevenueRecognized_059516F1E442769D405E6D623031A88C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue recognized that was in unbilled revenue at beginning of period </link:label>

<link:label id="lab_tgen_UnbilledRevenueRevenueRecognized_059516F1E442769D405E6D623031A88C_label_en-US" xlink:label="lab_tgen_UnbilledRevenueRevenueRecognized_059516F1E442769D405E6D623031A88C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unbilled Revenue, Revenue Recognized </link:label>

<link:label id="lab_tgen_UnbilledRevenueRevenueRecognized_059516F1E442769D405E6D623031A88C_documentation_en-US" xlink:label="lab_tgen_UnbilledRevenueRevenueRecognized_059516F1E442769D405E6D623031A88C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Unbilled Revenue, Revenue Recognized </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_UnbilledRevenueRevenueRecognized" xlink:label="loc_tgen_UnbilledRevenueRevenueRecognized_059516F1E442769D405E6D623031A88C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_UnbilledRevenueRevenueRecognized_059516F1E442769D405E6D623031A88C" xlink:to="lab_tgen_UnbilledRevenueRevenueRecognized_059516F1E442769D405E6D623031A88C" xlink:type="arc"/>

<link:label id="lab_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_17D87952B53E368915E16D623031B626_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_17D87952B53E368915E16D623031B626" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revenue billed this period that had been recognized in previous periods </link:label>

<link:label id="lab_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_17D87952B53E368915E16D623031B626_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_17D87952B53E368915E16D623031B626" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Performance Obligation Satisfied in Previous Period </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod" xlink:label="loc_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_17D87952B53E368915E16D623031B626" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_17D87952B53E368915E16D623031B626" xlink:to="lab_us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod_17D87952B53E368915E16D623031B626" xlink:type="arc"/>

<link:label id="lab_us-gaap_DeferredRevenueRevenueRecognized1_D91157D6AE6E2889D7646D62303162E4_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueRevenueRecognized1_D91157D6AE6E2889D7646D62303162E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenue recognized </link:label>

<link:label id="lab_us-gaap_DeferredRevenueRevenueRecognized1_D91157D6AE6E2889D7646D62303162E4_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueRevenueRecognized1_D91157D6AE6E2889D7646D62303162E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue, Revenue Recognized </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredRevenueRevenueRecognized1" xlink:label="loc_us-gaap_DeferredRevenueRevenueRecognized1_D91157D6AE6E2889D7646D62303162E4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRevenueRevenueRecognized1_D91157D6AE6E2889D7646D62303162E4" xlink:to="lab_us-gaap_DeferredRevenueRevenueRecognized1_D91157D6AE6E2889D7646D62303162E4" xlink:type="arc"/>

<link:label id="lab_us-gaap_DeferredRevenuePeriodIncreaseDecrease_593A329BBBE578A1DA5C6D6230318779_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenuePeriodIncreaseDecrease_593A329BBBE578A1DA5C6D6230318779" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash payments received in advance of satisfying performance obligations </link:label>

<link:label id="lab_us-gaap_DeferredRevenuePeriodIncreaseDecrease_593A329BBBE578A1DA5C6D6230318779_label_en-US" xlink:label="lab_us-gaap_DeferredRevenuePeriodIncreaseDecrease_593A329BBBE578A1DA5C6D6230318779" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Revenue, Period Increase (Decrease) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredRevenuePeriodIncreaseDecrease" xlink:label="loc_us-gaap_DeferredRevenuePeriodIncreaseDecrease_593A329BBBE578A1DA5C6D6230318779" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRevenuePeriodIncreaseDecrease_593A329BBBE578A1DA5C6D6230318779" xlink:to="lab_us-gaap_DeferredRevenuePeriodIncreaseDecrease_593A329BBBE578A1DA5C6D6230318779" xlink:type="arc"/>

<link:label id="lab_us-gaap_RevenueRemainingPerformanceObligation_C203E3BA6DF17064B3446D623031DB4F_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligation_C203E3BA6DF17064B3446D623031DB4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Remaining performance obligations </link:label>

<link:label id="lab_us-gaap_RevenueRemainingPerformanceObligation_C203E3BA6DF17064B3446D623031DB4F_label_en-US" xlink:label="lab_us-gaap_RevenueRemainingPerformanceObligation_C203E3BA6DF17064B3446D623031DB4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue, Remaining Performance Obligation, Amount </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_C203E3BA6DF17064B3446D623031DB4F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligation_C203E3BA6DF17064B3446D623031DB4F" xlink:to="lab_us-gaap_RevenueRemainingPerformanceObligation_C203E3BA6DF17064B3446D623031DB4F" xlink:type="arc"/>

<link:label id="lab_tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent_AB10CE02576015FBAA6B6D62303104F2_terseLabel_en-US" xlink:label="lab_tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent_AB10CE02576015FBAA6B6D62303104F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Performance obligation revenue expected to be recognized over the next 24 months (percent) </link:label>

<link:label id="lab_tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent_AB10CE02576015FBAA6B6D62303104F2_label_en-US" xlink:label="lab_tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent_AB10CE02576015FBAA6B6D62303104F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Performance Obligation Recognized over Next Two Years, Percent </link:label>

<link:label id="lab_tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent_AB10CE02576015FBAA6B6D62303104F2_documentation_en-US" xlink:label="lab_tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent_AB10CE02576015FBAA6B6D62303104F2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Performance Obligation Recognized over Next Two Years, Percent </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent" xlink:label="loc_tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent_AB10CE02576015FBAA6B6D62303104F2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent_AB10CE02576015FBAA6B6D62303104F2" xlink:to="lab_tgen_PerformanceObligationRecognizedoverNextTwoYearsPercent_AB10CE02576015FBAA6B6D62303104F2" xlink:type="arc"/>

<link:label id="lab_tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent_5FF3CB5ECCFEBB0461546D6230319141_terseLabel_en-US" xlink:label="lab_tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent_5FF3CB5ECCFEBB0461546D6230319141" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Performance obligation revenue to be recognized in first 12 months (percent) </link:label>

<link:label id="lab_tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent_5FF3CB5ECCFEBB0461546D6230319141_label_en-US" xlink:label="lab_tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent_5FF3CB5ECCFEBB0461546D6230319141" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Performance Obligation Recognized over Next Twelve Months, Percent </link:label>

<link:label id="lab_tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent_5FF3CB5ECCFEBB0461546D6230319141_documentation_en-US" xlink:label="lab_tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent_5FF3CB5ECCFEBB0461546D6230319141" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Performance Obligation Recognized over Next Twelve Months, Percent </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent" xlink:label="loc_tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent_5FF3CB5ECCFEBB0461546D6230319141" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent_5FF3CB5ECCFEBB0461546D6230319141" xlink:to="lab_tgen_PerformanceObligationRecognizedoverNextTwelveMonthsPercent_5FF3CB5ECCFEBB0461546D6230319141" xlink:type="arc"/>

<link:label id="lab_tgen_PerformanceObligationRecognizedinYearTwoPercent_6C6FE2CF1FCC51AF420A6D6230316449_terseLabel_en-US" xlink:label="lab_tgen_PerformanceObligationRecognizedinYearTwoPercent_6C6FE2CF1FCC51AF420A6D6230316449" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Performance obligation revenue to be recognized over the subsequent 12 months (percent) </link:label>

<link:label id="lab_tgen_PerformanceObligationRecognizedinYearTwoPercent_6C6FE2CF1FCC51AF420A6D6230316449_label_en-US" xlink:label="lab_tgen_PerformanceObligationRecognizedinYearTwoPercent_6C6FE2CF1FCC51AF420A6D6230316449" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Performance Obligation Recognized in Year Two, Percent </link:label>

<link:label id="lab_tgen_PerformanceObligationRecognizedinYearTwoPercent_6C6FE2CF1FCC51AF420A6D6230316449_documentation_en-US" xlink:label="lab_tgen_PerformanceObligationRecognizedinYearTwoPercent_6C6FE2CF1FCC51AF420A6D6230316449" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Performance Obligation Recognized in Year Two, Percent </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_PerformanceObligationRecognizedinYearTwoPercent" xlink:label="loc_tgen_PerformanceObligationRecognizedinYearTwoPercent_6C6FE2CF1FCC51AF420A6D6230316449" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_PerformanceObligationRecognizedinYearTwoPercent_6C6FE2CF1FCC51AF420A6D6230316449" xlink:to="lab_tgen_PerformanceObligationRecognizedinYearTwoPercent_6C6FE2CF1FCC51AF420A6D6230316449" xlink:type="arc"/>

<link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_9B5C524799F71202AB5F6D622FB45B8C_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_9B5C524799F71202AB5F6D622FB45B8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments and Contingencies Disclosure [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_9B5C524799F71202AB5F6D622FB45B8C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_9B5C524799F71202AB5F6D622FB45B8C" xlink:to="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_9B5C524799F71202AB5F6D622FB45B8C" xlink:type="arc"/>

<link:label id="lab_us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock_28A2261EFAE3753B632A6D622FB4A392_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock_28A2261EFAE3753B632A6D622FB4A392" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Commitments and contingencies </link:label>

<link:label id="lab_us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock_28A2261EFAE3753B632A6D622FB4A392_label_en-US" xlink:label="lab_us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock_28A2261EFAE3753B632A6D622FB4A392" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Commitments Contingencies and Guarantees [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock" xlink:label="loc_us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock_28A2261EFAE3753B632A6D622FB4A392" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock_28A2261EFAE3753B632A6D622FB4A392" xlink:to="lab_us-gaap_CommitmentsContingenciesAndGuaranteesTextBlock_28A2261EFAE3753B632A6D622FB4A392" xlink:type="arc"/>

<link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_529954E600355D0440B96D6230022EF2_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_529954E600355D0440B96D6230022EF2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Measurements </link:label>

<link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_529954E600355D0440B96D6230022EF2_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_529954E600355D0440B96D6230022EF2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Disclosures [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_529954E600355D0440B96D6230022EF2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosuresTextBlock_529954E600355D0440B96D6230022EF2" xlink:to="lab_us-gaap_FairValueDisclosuresTextBlock_529954E600355D0440B96D6230022EF2" xlink:type="arc"/>

<link:label id="lab_srt_RangeAxis_2CF54429C0C271DABD5B3785640023FE_terseLabel_en-US" xlink:label="lab_srt_RangeAxis_2CF54429C0C271DABD5B3785640023FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Range [Axis] </link:label>

<link:label id="lab_srt_RangeAxis_2CF54429C0C271DABD5B3785640023FE_label_en-US" xlink:label="lab_srt_RangeAxis_2CF54429C0C271DABD5B3785640023FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Range [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_2CF54429C0C271DABD5B3785640023FE" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeAxis_2CF54429C0C271DABD5B3785640023FE" xlink:to="lab_srt_RangeAxis_2CF54429C0C271DABD5B3785640023FE" xlink:type="arc"/>

<link:label id="lab_srt_RangeMember_942265710A60E51863803785640004ED_terseLabel_en-US" xlink:label="lab_srt_RangeMember_942265710A60E51863803785640004ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Range [Domain] </link:label>

<link:label id="lab_srt_RangeMember_942265710A60E51863803785640004ED_label_en-US" xlink:label="lab_srt_RangeMember_942265710A60E51863803785640004ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Range [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_942265710A60E51863803785640004ED" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_RangeMember_942265710A60E51863803785640004ED" xlink:to="lab_srt_RangeMember_942265710A60E51863803785640004ED" xlink:type="arc"/>

<link:label id="lab_srt_MinimumMember_A231872F65DD9F869E50378564004F3D_terseLabel_en-US" xlink:label="lab_srt_MinimumMember_A231872F65DD9F869E50378564004F3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Minimum </link:label>

<link:label id="lab_srt_MinimumMember_A231872F65DD9F869E50378564004F3D_label_en-US" xlink:label="lab_srt_MinimumMember_A231872F65DD9F869E50378564004F3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Minimum [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_A231872F65DD9F869E50378564004F3D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MinimumMember_A231872F65DD9F869E50378564004F3D" xlink:to="lab_srt_MinimumMember_A231872F65DD9F869E50378564004F3D" xlink:type="arc"/>

<link:label id="lab_srt_MaximumMember_39ADF70AE35FD8DB284337856400447E_terseLabel_en-US" xlink:label="lab_srt_MaximumMember_39ADF70AE35FD8DB284337856400447E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum </link:label>

<link:label id="lab_srt_MaximumMember_39ADF70AE35FD8DB284337856400447E_label_en-US" xlink:label="lab_srt_MaximumMember_39ADF70AE35FD8DB284337856400447E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_39ADF70AE35FD8DB284337856400447E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MaximumMember_39ADF70AE35FD8DB284337856400447E" xlink:to="lab_srt_MaximumMember_39ADF70AE35FD8DB284337856400447E" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_27746E5B2A3F547357A8378564106532_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_27746E5B2A3F547357A8378564106532" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock Options Outstanding [Roll Forward] </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_27746E5B2A3F547357A8378564106532_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_27746E5B2A3F547357A8378564106532" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_27746E5B2A3F547357A8378564106532" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_27746E5B2A3F547357A8378564106532" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_27746E5B2A3F547357A8378564106532" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_50F9AD989AA75FFCCCE737856410C812_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_50F9AD989AA75FFCCCE737856410C812" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Beginning (shares) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_50F9AD989AA75FFCCCE737856410C812_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_50F9AD989AA75FFCCCE737856410C812" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_50F9AD989AA75FFCCCE737856410C812" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_50F9AD989AA75FFCCCE737856410C812" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_50F9AD989AA75FFCCCE737856410C812" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AE35E789386B038DC9AD378564100C5C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AE35E789386B038DC9AD378564100C5C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Granted (shares) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AE35E789386B038DC9AD378564100C5C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AE35E789386B038DC9AD378564100C5C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AE35E789386B038DC9AD378564100C5C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AE35E789386B038DC9AD378564100C5C" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_AE35E789386B038DC9AD378564100C5C" xlink:type="arc"/>

<link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_CB5A165ECC6EA04998333785641030DD_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_CB5A165ECC6EA04998333785641030DD" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Exercised (shares) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_CB5A165ECC6EA04998333785641030DD" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_CB5A165ECC6EA04998333785641030DD" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_CB5A165ECC6EA04998333785641030DD" xlink:type="arc"/>

<link:label id="lab_tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod_34D123EECAA37E320E3337856410CDAA_negatedTerseLabel_en-US" xlink:label="lab_tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod_34D123EECAA37E320E3337856410CDAA" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Canceled and forfeited (shares) </link:label>

<link:label id="lab_tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod_34D123EECAA37E320E3337856410CDAA_label_en-US" xlink:label="lab_tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod_34D123EECAA37E320E3337856410CDAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Cancellations and Forfeitures in Period </link:label>

<link:label id="lab_tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod_34D123EECAA37E320E3337856410CDAA_documentation_en-US" xlink:label="lab_tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod_34D123EECAA37E320E3337856410CDAA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Cancellations and Forfeitures in Period </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod" xlink:label="loc_tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod_34D123EECAA37E320E3337856410CDAA" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod_34D123EECAA37E320E3337856410CDAA" xlink:to="lab_tgen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancellationsAndForfeituresInPeriod_34D123EECAA37E320E3337856410CDAA" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1B95D0CAE36A44E084303785641073BE_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1B95D0CAE36A44E084303785641073BE" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending (shares) </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1B95D0CAE36A44E084303785641073BE" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1B95D0CAE36A44E084303785641073BE" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1B95D0CAE36A44E084303785641073BE" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_FB5B37F3FE912A19ED04378564105D12_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_FB5B37F3FE912A19ED04378564105D12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercisable (shares) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_FB5B37F3FE912A19ED04378564105D12_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_FB5B37F3FE912A19ED04378564105D12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_FB5B37F3FE912A19ED04378564105D12" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_FB5B37F3FE912A19ED04378564105D12" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_FB5B37F3FE912A19ED04378564105D12" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_13AAF14943FE8EFFA5F6378564103B83_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_13AAF14943FE8EFFA5F6378564103B83" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vested and expected to vest (shares) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_13AAF14943FE8EFFA5F6378564103B83_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_13AAF14943FE8EFFA5F6378564103B83" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_13AAF14943FE8EFFA5F6378564103B83" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_13AAF14943FE8EFFA5F6378564103B83" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_13AAF14943FE8EFFA5F6378564103B83" xlink:type="arc"/>

<link:label id="lab_tgen_ExercisePricePerShareAbstract_6341A2E3E1DF897F10FF37856410A362_terseLabel_en-US" xlink:label="lab_tgen_ExercisePricePerShareAbstract_6341A2E3E1DF897F10FF37856410A362" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise Price Per Share [Abstract] </link:label>

<link:label id="lab_tgen_ExercisePricePerShareAbstract_6341A2E3E1DF897F10FF37856410A362_label_en-US" xlink:label="lab_tgen_ExercisePricePerShareAbstract_6341A2E3E1DF897F10FF37856410A362" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Exercise Price Per Share [Abstract] </link:label>

<link:label id="lab_tgen_ExercisePricePerShareAbstract_6341A2E3E1DF897F10FF37856410A362_documentation_en-US" xlink:label="lab_tgen_ExercisePricePerShareAbstract_6341A2E3E1DF897F10FF37856410A362" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Exercise Price Per Share [Abstract] </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_ExercisePricePerShareAbstract" xlink:label="loc_tgen_ExercisePricePerShareAbstract_6341A2E3E1DF897F10FF37856410A362" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_ExercisePricePerShareAbstract_6341A2E3E1DF897F10FF37856410A362" xlink:to="lab_tgen_ExercisePricePerShareAbstract_6341A2E3E1DF897F10FF37856410A362" xlink:type="arc"/>

<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E468FA2770B14294938B37856410BE41_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E468FA2770B14294938B37856410BE41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Exercise Price Per Share, Outstanding, Minimum (per share) </link:label>

<link:label id="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E468FA2770B14294938B37856410BE41_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E468FA2770B14294938B37856410BE41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_E468FA2770B14294938B37856410BE41" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_D0F138D97117BC2185703785641040AC_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_D0F138D97117BC2185703785641040AC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price </link:label>

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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_64C26224CCA10EB56DAC6D622FC35DE9_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_64C26224CCA10EB56DAC6D622FC35DE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_64C26224CCA10EB56DAC6D622FC35DE9_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentByTypeAxis_64C26224CCA10EB56DAC6D622FC35DE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_64C26224CCA10EB56DAC6D622FC35DE9" xlink:type="locator"/>

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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_D60BF1A6F9EFAC0A3B916D622FC37237_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_D60BF1A6F9EFAC0A3B916D622FC37237" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_D60BF1A6F9EFAC0A3B916D622FC37237_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTypeDomain_D60BF1A6F9EFAC0A3B916D622FC37237" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Type [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_D60BF1A6F9EFAC0A3B916D622FC37237" xlink:type="locator"/>

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<link:label id="lab_us-gaap_EnergyEquipmentMember_BC61E5BF313E10F192CC6D622FC374C7_terseLabel_en-US" xlink:label="lab_us-gaap_EnergyEquipmentMember_BC61E5BF313E10F192CC6D622FC374C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Energy systems </link:label>

<link:label id="lab_us-gaap_EnergyEquipmentMember_BC61E5BF313E10F192CC6D622FC374C7_label_en-US" xlink:label="lab_us-gaap_EnergyEquipmentMember_BC61E5BF313E10F192CC6D622FC374C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Energy Equipment [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EnergyEquipmentMember" xlink:label="loc_us-gaap_EnergyEquipmentMember_BC61E5BF313E10F192CC6D622FC374C7" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EnergyEquipmentMember_BC61E5BF313E10F192CC6D622FC374C7" xlink:to="lab_us-gaap_EnergyEquipmentMember_BC61E5BF313E10F192CC6D622FC374C7" xlink:type="arc"/>

<link:label id="lab_us-gaap_MachineryAndEquipmentMember_2007B150C5C02364BCB46D622FC33444_terseLabel_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentMember_2007B150C5C02364BCB46D622FC33444" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Machinery and equipment </link:label>

<link:label id="lab_us-gaap_MachineryAndEquipmentMember_2007B150C5C02364BCB46D622FC33444_label_en-US" xlink:label="lab_us-gaap_MachineryAndEquipmentMember_2007B150C5C02364BCB46D622FC33444" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Machinery and Equipment [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_2007B150C5C02364BCB46D622FC33444" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MachineryAndEquipmentMember_2007B150C5C02364BCB46D622FC33444" xlink:to="lab_us-gaap_MachineryAndEquipmentMember_2007B150C5C02364BCB46D622FC33444" xlink:type="arc"/>

<link:label id="lab_us-gaap_FurnitureAndFixturesMember_C32CA3FA9F1CEB0CDAF66D622FC39995_terseLabel_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_C32CA3FA9F1CEB0CDAF66D622FC39995" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Furniture and fixtures </link:label>

<link:label id="lab_us-gaap_FurnitureAndFixturesMember_C32CA3FA9F1CEB0CDAF66D622FC39995_label_en-US" xlink:label="lab_us-gaap_FurnitureAndFixturesMember_C32CA3FA9F1CEB0CDAF66D622FC39995" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Furniture and Fixtures [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_C32CA3FA9F1CEB0CDAF66D622FC39995" xlink:type="locator"/>

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<link:label id="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_393D1F139DCCC6CBFBAA6D622FC3E551_terseLabel_en-US" xlink:label="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_393D1F139DCCC6CBFBAA6D622FC3E551" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Computer software </link:label>

<link:label id="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_393D1F139DCCC6CBFBAA6D622FC3E551_label_en-US" xlink:label="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_393D1F139DCCC6CBFBAA6D622FC3E551" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Computer Software, Intangible Asset [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_393D1F139DCCC6CBFBAA6D622FC3E551" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LeaseholdImprovementsMember_9AE849C14E4285B931AB6D622FC38EEF_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_9AE849C14E4285B931AB6D622FC38EEF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Leasehold improvements </link:label>

<link:label id="lab_us-gaap_LeaseholdImprovementsMember_9AE849C14E4285B931AB6D622FC38EEF_label_en-US" xlink:label="lab_us-gaap_LeaseholdImprovementsMember_9AE849C14E4285B931AB6D622FC38EEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Leasehold Improvements [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_9AE849C14E4285B931AB6D622FC38EEF" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseholdImprovementsMember_9AE849C14E4285B931AB6D622FC38EEF" xlink:to="lab_us-gaap_LeaseholdImprovementsMember_9AE849C14E4285B931AB6D622FC38EEF" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_EC46DE07E24A77BDED726D622FC33043_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_EC46DE07E24A77BDED726D622FC33043" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentLineItems_EC46DE07E24A77BDED726D622FC33043_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentLineItems_EC46DE07E24A77BDED726D622FC33043" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_EC46DE07E24A77BDED726D622FC33043" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_EC46DE07E24A77BDED726D622FC33043" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentLineItems_EC46DE07E24A77BDED726D622FC33043" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_EE1B058FE5BCEDE2EE846D622FC3B48E_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_EE1B058FE5BCEDE2EE846D622FC3B48E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, gross </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentGross_EE1B058FE5BCEDE2EE846D622FC3B48E_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentGross_EE1B058FE5BCEDE2EE846D622FC3B48E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Gross </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_EE1B058FE5BCEDE2EE846D622FC3B48E" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_EE1B058FE5BCEDE2EE846D622FC3B48E" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentGross_EE1B058FE5BCEDE2EE846D622FC3B48E" xlink:type="arc"/>

<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_EEF0B7DD1BA9F304708D6D622FC37563_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_EEF0B7DD1BA9F304708D6D622FC37563" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Less - accumulated depreciation and amortization </link:label>

<link:label id="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_EEF0B7DD1BA9F304708D6D622FC37563_label_en-US" xlink:label="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_EEF0B7DD1BA9F304708D6D622FC37563" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_EEF0B7DD1BA9F304708D6D622FC37563" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_EEF0B7DD1BA9F304708D6D622FC37563" xlink:to="lab_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_EEF0B7DD1BA9F304708D6D622FC37563" xlink:type="arc"/>

<link:label id="lab_tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress_F94F1F19FA8417037D1A6D622FC3759D_totalLabel_en-US" xlink:label="lab_tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress_F94F1F19FA8417037D1A6D622FC3759D" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Property and equipment, net, before construction in progress </link:label>

<link:label id="lab_tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress_F94F1F19FA8417037D1A6D622FC3759D_label_en-US" xlink:label="lab_tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress_F94F1F19FA8417037D1A6D622FC3759D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant And Equipment, Net, Before Public Utilities, Contruction Work In Progress </link:label>

<link:label id="lab_tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress_F94F1F19FA8417037D1A6D622FC3759D_documentation_en-US" xlink:label="lab_tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress_F94F1F19FA8417037D1A6D622FC3759D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Property, Plant And Equipment, Net, Before Public Utilities Contruction Work In Progress </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress" xlink:label="loc_tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress_F94F1F19FA8417037D1A6D622FC3759D" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress_F94F1F19FA8417037D1A6D622FC3759D" xlink:to="lab_tgen_PropertyPlantAndEquipmentNetBeforePublicUtilitiesContructionWorkInProgress_F94F1F19FA8417037D1A6D622FC3759D" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_690D1BDE8F1DD02B0E606D622FC38CD6_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_690D1BDE8F1DD02B0E606D622FC38CD6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Useful life - years </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_690D1BDE8F1DD02B0E606D622FC38CD6_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_690D1BDE8F1DD02B0E606D622FC38CD6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Useful Life </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_690D1BDE8F1DD02B0E606D622FC38CD6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_690D1BDE8F1DD02B0E606D622FC38CD6" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentUsefulLife_690D1BDE8F1DD02B0E606D622FC38CD6" xlink:type="arc"/>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_E689BF7D5152CA86F4E86D622FF232A4_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_E689BF7D5152CA86F4E86D622FF232A4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Summary of Property, Plant and Equipment </link:label>

<link:label id="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_E689BF7D5152CA86F4E86D622FF232A4_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_E689BF7D5152CA86F4E86D622FF232A4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment [Table Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_E689BF7D5152CA86F4E86D622FF232A4" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_E689BF7D5152CA86F4E86D622FF232A4" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentTextBlock_E689BF7D5152CA86F4E86D622FF232A4" xlink:type="arc"/>

<link:label id="lab_us-gaap_DebtDisclosureAbstract_D779964D3FF544348B546D622F1721CD_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract_D779964D3FF544348B546D622F1721CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Disclosure [Abstract] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_D779964D3FF544348B546D622F1721CD" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtDisclosureAbstract_D779964D3FF544348B546D622F1721CD" xlink:to="lab_us-gaap_DebtDisclosureAbstract_D779964D3FF544348B546D622F1721CD" xlink:type="arc"/>

<link:label id="lab_us-gaap_LineOfCreditFacilityTable_7C5F2A5FBAA4A17BF1D66D622F177C6C_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityTable_7C5F2A5FBAA4A17BF1D66D622F177C6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Table] </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityTable_7C5F2A5FBAA4A17BF1D66D622F177C6C_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityTable_7C5F2A5FBAA4A17BF1D66D622F177C6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Table] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_7C5F2A5FBAA4A17BF1D66D622F177C6C" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_7C5F2A5FBAA4A17BF1D66D622F177C6C" xlink:to="lab_us-gaap_LineOfCreditFacilityTable_7C5F2A5FBAA4A17BF1D66D622F177C6C" xlink:type="arc"/>

<link:label id="lab_us-gaap_VariableRateAxis_16C71AEF36E37FAA55E16D622F175965_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis_16C71AEF36E37FAA55E16D622F175965" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate [Axis] </link:label>

<link:label id="lab_us-gaap_VariableRateAxis_16C71AEF36E37FAA55E16D622F175965_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis_16C71AEF36E37FAA55E16D622F175965" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_16C71AEF36E37FAA55E16D622F175965" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateAxis_16C71AEF36E37FAA55E16D622F175965" xlink:to="lab_us-gaap_VariableRateAxis_16C71AEF36E37FAA55E16D622F175965" xlink:type="arc"/>

<link:label id="lab_us-gaap_VariableRateDomain_8658994A306AE936F56A6D622F1778E2_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_8658994A306AE936F56A6D622F1778E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate [Domain] </link:label>

<link:label id="lab_us-gaap_VariableRateDomain_8658994A306AE936F56A6D622F1778E2_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_8658994A306AE936F56A6D622F1778E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_8658994A306AE936F56A6D622F1778E2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateDomain_8658994A306AE936F56A6D622F1778E2" xlink:to="lab_us-gaap_VariableRateDomain_8658994A306AE936F56A6D622F1778E2" xlink:type="arc"/>

<link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_64D960D20DC21804F40C6D622F17AF82_terseLabel_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_64D960D20DC21804F40C6D622F17AF82" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> One Month LIBOR </link:label>

<link:label id="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_64D960D20DC21804F40C6D622F17AF82_label_en-US" xlink:label="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_64D960D20DC21804F40C6D622F17AF82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> London Interbank Offered Rate (LIBOR) [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_64D960D20DC21804F40C6D622F17AF82" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_64D960D20DC21804F40C6D622F17AF82" xlink:to="lab_us-gaap_LondonInterbankOfferedRateLIBORMember_64D960D20DC21804F40C6D622F17AF82" xlink:type="arc"/>

<link:label id="lab_us-gaap_BaseRateMember_6E135CE1595AC18336166D622F17CE79_terseLabel_en-US" xlink:label="lab_us-gaap_BaseRateMember_6E135CE1595AC18336166D622F17CE79" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lender's Base Rate </link:label>

<link:label id="lab_us-gaap_BaseRateMember_6E135CE1595AC18336166D622F17CE79_label_en-US" xlink:label="lab_us-gaap_BaseRateMember_6E135CE1595AC18336166D622F17CE79" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Base Rate [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BaseRateMember" xlink:label="loc_us-gaap_BaseRateMember_6E135CE1595AC18336166D622F17CE79" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BaseRateMember_6E135CE1595AC18336166D622F17CE79" xlink:to="lab_us-gaap_BaseRateMember_6E135CE1595AC18336166D622F17CE79" xlink:type="arc"/>

<link:label id="lab_us-gaap_FederalFundsEffectiveSwapRateMember_2A3112F5311E6D7AA9D96D622F17B8F5_terseLabel_en-US" xlink:label="lab_us-gaap_FederalFundsEffectiveSwapRateMember_2A3112F5311E6D7AA9D96D622F17B8F5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Federal Funds Rate </link:label>

<link:label id="lab_us-gaap_FederalFundsEffectiveSwapRateMember_2A3112F5311E6D7AA9D96D622F17B8F5_label_en-US" xlink:label="lab_us-gaap_FederalFundsEffectiveSwapRateMember_2A3112F5311E6D7AA9D96D622F17B8F5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Federal Funds Effective Swap Rate [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_2A3112F5311E6D7AA9D96D622F17B8F5" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FederalFundsEffectiveSwapRateMember_2A3112F5311E6D7AA9D96D622F17B8F5" xlink:to="lab_us-gaap_FederalFundsEffectiveSwapRateMember_2A3112F5311E6D7AA9D96D622F17B8F5" xlink:type="arc"/>

<link:label id="lab_tgen_LendersBaseRateOneMonthLIBORMember_41D6AC0A61F8F56E323C6D622F17C724_terseLabel_en-US" xlink:label="lab_tgen_LendersBaseRateOneMonthLIBORMember_41D6AC0A61F8F56E323C6D622F17C724" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lender's Base Rate - One Month LIBOR </link:label>

<link:label id="lab_tgen_LendersBaseRateOneMonthLIBORMember_41D6AC0A61F8F56E323C6D622F17C724_label_en-US" xlink:label="lab_tgen_LendersBaseRateOneMonthLIBORMember_41D6AC0A61F8F56E323C6D622F17C724" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lender's Base Rate - One Month LIBOR [Member] </link:label>

<link:label id="lab_tgen_LendersBaseRateOneMonthLIBORMember_41D6AC0A61F8F56E323C6D622F17C724_documentation_en-US" xlink:label="lab_tgen_LendersBaseRateOneMonthLIBORMember_41D6AC0A61F8F56E323C6D622F17C724" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lender's Base Rate - One Month LIBOR [Member] </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_LendersBaseRateOneMonthLIBORMember" xlink:label="loc_tgen_LendersBaseRateOneMonthLIBORMember_41D6AC0A61F8F56E323C6D622F17C724" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_LendersBaseRateOneMonthLIBORMember_41D6AC0A61F8F56E323C6D622F17C724" xlink:to="lab_tgen_LendersBaseRateOneMonthLIBORMember_41D6AC0A61F8F56E323C6D622F17C724" xlink:type="arc"/>

<link:label id="lab_us-gaap_LineOfCreditFacilityAxis_CA27540E1D4B2304246B6D622F17A153_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityAxis_CA27540E1D4B2304246B6D622F17A153" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lender Name [Axis] </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityAxis_CA27540E1D4B2304246B6D622F17A153_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityAxis_CA27540E1D4B2304246B6D622F17A153" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lender Name [Axis] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_CA27540E1D4B2304246B6D622F17A153" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_CA27540E1D4B2304246B6D622F17A153" xlink:to="lab_us-gaap_LineOfCreditFacilityAxis_CA27540E1D4B2304246B6D622F17A153" xlink:type="arc"/>

<link:label id="lab_us-gaap_LineOfCreditFacilityLenderDomain_40210B549C7895742A4E6D622F17572B_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLenderDomain_40210B549C7895742A4E6D622F17572B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Lender [Domain] </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityLenderDomain_40210B549C7895742A4E6D622F17572B_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLenderDomain_40210B549C7895742A4E6D622F17572B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Lender [Domain] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_40210B549C7895742A4E6D622F17572B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_40210B549C7895742A4E6D622F17572B" xlink:to="lab_us-gaap_LineOfCreditFacilityLenderDomain_40210B549C7895742A4E6D622F17572B" xlink:type="arc"/>

<link:label id="lab_tgen_WebsterBusinessCreditCorporationMember_E2E409E815516787C83C6D622F17A055_terseLabel_en-US" xlink:label="lab_tgen_WebsterBusinessCreditCorporationMember_E2E409E815516787C83C6D622F17A055" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Webster Business Credit Corporation </link:label>

<link:label id="lab_tgen_WebsterBusinessCreditCorporationMember_E2E409E815516787C83C6D622F17A055_label_en-US" xlink:label="lab_tgen_WebsterBusinessCreditCorporationMember_E2E409E815516787C83C6D622F17A055" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Webster Business Credit Corporation [Member] </link:label>

<link:label id="lab_tgen_WebsterBusinessCreditCorporationMember_E2E409E815516787C83C6D622F17A055_documentation_en-US" xlink:label="lab_tgen_WebsterBusinessCreditCorporationMember_E2E409E815516787C83C6D622F17A055" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Webster Business Credit Corporation [Member] </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_WebsterBusinessCreditCorporationMember" xlink:label="loc_tgen_WebsterBusinessCreditCorporationMember_E2E409E815516787C83C6D622F17A055" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_WebsterBusinessCreditCorporationMember_E2E409E815516787C83C6D622F17A055" xlink:to="lab_tgen_WebsterBusinessCreditCorporationMember_E2E409E815516787C83C6D622F17A055" xlink:type="arc"/>

<link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_F3FDE04959AB4BD3BC1A6D622F1740C2_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems_F3FDE04959AB4BD3BC1A6D622F1740C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Line Items] </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityLineItems_F3FDE04959AB4BD3BC1A6D622F1740C2_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityLineItems_F3FDE04959AB4BD3BC1A6D622F1740C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_F3FDE04959AB4BD3BC1A6D622F1740C2" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_F3FDE04959AB4BD3BC1A6D622F1740C2" xlink:to="lab_us-gaap_LineOfCreditFacilityLineItems_F3FDE04959AB4BD3BC1A6D622F1740C2" xlink:type="arc"/>

<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F80E4384497DD6142D896D622F17B988_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F80E4384497DD6142D896D622F17B988" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of credit limit </link:label>

<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F80E4384497DD6142D896D622F17B988_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F80E4384497DD6142D896D622F17B988" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Maximum Borrowing Capacity </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F80E4384497DD6142D896D622F17B988" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F80E4384497DD6142D896D622F17B988" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_F80E4384497DD6142D896D622F17B988" xlink:type="arc"/>

<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_036AED55574D3E584F8A6D622F174494_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_036AED55574D3E584F8A6D622F174494" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Basis spread on variable interest rate (percent) </link:label>

<link:label id="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_036AED55574D3E584F8A6D622F174494_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_036AED55574D3E584F8A6D622F174494" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Basis Spread on Variable Rate </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_036AED55574D3E584F8A6D622F174494" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_036AED55574D3E584F8A6D622F174494" xlink:to="lab_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_036AED55574D3E584F8A6D622F174494" xlink:type="arc"/>

<link:label id="lab_tgen_DebtCovenantFixedChargeCoverageRatio_57D1BD12A8FBB2A739166D622F1721C6_terseLabel_en-US" xlink:label="lab_tgen_DebtCovenantFixedChargeCoverageRatio_57D1BD12A8FBB2A739166D622F1721C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fixed charge coverage ratio </link:label>

<link:label id="lab_tgen_DebtCovenantFixedChargeCoverageRatio_57D1BD12A8FBB2A739166D622F1721C6_label_en-US" xlink:label="lab_tgen_DebtCovenantFixedChargeCoverageRatio_57D1BD12A8FBB2A739166D622F1721C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Covenant, Fixed Charge Coverage Ratio </link:label>

<link:label id="lab_tgen_DebtCovenantFixedChargeCoverageRatio_57D1BD12A8FBB2A739166D622F1721C6_documentation_en-US" xlink:label="lab_tgen_DebtCovenantFixedChargeCoverageRatio_57D1BD12A8FBB2A739166D622F1721C6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Covenant, Fixed Charge Coverage Ratio </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_DebtCovenantFixedChargeCoverageRatio" xlink:label="loc_tgen_DebtCovenantFixedChargeCoverageRatio_57D1BD12A8FBB2A739166D622F1721C6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_DebtCovenantFixedChargeCoverageRatio_57D1BD12A8FBB2A739166D622F1721C6" xlink:to="lab_tgen_DebtCovenantFixedChargeCoverageRatio_57D1BD12A8FBB2A739166D622F1721C6" xlink:type="arc"/>

<link:label id="lab_tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit_F23EF4BF73D599E07AD26D622F17766F_terseLabel_en-US" xlink:label="lab_tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit_F23EF4BF73D599E07AD26D622F17766F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Annual financial capital expenditure limit </link:label>

<link:label id="lab_tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit_F23EF4BF73D599E07AD26D622F17766F_label_en-US" xlink:label="lab_tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit_F23EF4BF73D599E07AD26D622F17766F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Covenant, Annual Financial Capital Expenditure Limit </link:label>

<link:label id="lab_tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit_F23EF4BF73D599E07AD26D622F17766F_documentation_en-US" xlink:label="lab_tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit_F23EF4BF73D599E07AD26D622F17766F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Covenant, Annual Financial Capital Expenditure Limit </link:label>

<link:loc xlink:href="tgen-20190930.xsd#tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit" xlink:label="loc_tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit_F23EF4BF73D599E07AD26D622F17766F" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit_F23EF4BF73D599E07AD26D622F17766F" xlink:to="lab_tgen_DebtCovenantAnnualFinancialCapitalExpenditureLimit_F23EF4BF73D599E07AD26D622F17766F" xlink:type="arc"/>

<link:label id="lab_us-gaap_DeferredFinanceCostsGross_758BFD72A11FA2EAA5116D622F1780DE_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsGross_758BFD72A11FA2EAA5116D622F1780DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt issuance costs incurred </link:label>

<link:label id="lab_us-gaap_DeferredFinanceCostsGross_758BFD72A11FA2EAA5116D622F1780DE_label_en-US" xlink:label="lab_us-gaap_DeferredFinanceCostsGross_758BFD72A11FA2EAA5116D622F1780DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Issuance Costs, Gross </link:label>

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<link:label id="lab_us-gaap_EarningsPerShareTextBlock_8038F47DAD0BE274F72537851F71EB8A_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_8038F47DAD0BE274F72537851F71EB8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Earnings Per Share [Text Block] </link:label>

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<link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_660537FAD2D7604201876D623002A79E_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_660537FAD2D7604201876D623002A79E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis </link:label>

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<link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_7B15E58F84EF1CFBE0DA6D622F85B66F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_7B15E58F84EF1CFBE0DA6D622F85B66F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Segment Reporting Information, by Segment [Table] </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_7B15E58F84EF1CFBE0DA6D622F85B66F" xlink:type="locator"/>

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<link:label id="lab_us-gaap_IntersegmentEliminationMember_6C35E9875AD2D27D4B2C6D622F854E47_terseLabel_en-US" xlink:label="lab_us-gaap_IntersegmentEliminationMember_6C35E9875AD2D27D4B2C6D622F854E47" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intersegment Eliminations </link:label>

<link:label id="lab_us-gaap_IntersegmentEliminationMember_6C35E9875AD2D27D4B2C6D622F854E47_label_en-US" xlink:label="lab_us-gaap_IntersegmentEliminationMember_6C35E9875AD2D27D4B2C6D622F854E47" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Intersegment Eliminations [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="loc_us-gaap_IntersegmentEliminationMember_6C35E9875AD2D27D4B2C6D622F854E47" xlink:type="locator"/>

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<link:label id="lab_us-gaap_CorporateAndOtherMember_C57FA4F4BA02FC3BF70E6D622F85AA79_terseLabel_en-US" xlink:label="lab_us-gaap_CorporateAndOtherMember_C57FA4F4BA02FC3BF70E6D622F85AA79" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Corporate, other and elimination </link:label>

<link:label id="lab_us-gaap_CorporateAndOtherMember_C57FA4F4BA02FC3BF70E6D622F85AA79_label_en-US" xlink:label="lab_us-gaap_CorporateAndOtherMember_C57FA4F4BA02FC3BF70E6D622F85AA79" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Corporate and Other [Member] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="loc_us-gaap_CorporateAndOtherMember_C57FA4F4BA02FC3BF70E6D622F85AA79" xlink:type="locator"/>

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<link:label id="lab_us-gaap_SegmentReportingInformationLineItems_0D998E85737A81B1C8696D622F85EEBA_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems_0D998E85737A81B1C8696D622F85EEBA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Segment Reporting Information [Line Items] </link:label>

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<link:label id="lab_us-gaap_NumberOfOperatingSegments_75F5CE1FE2547DE9299B6D622F859B12_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfOperatingSegments_75F5CE1FE2547DE9299B6D622F859B12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of operating divisions </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NumberOfOperatingSegments" xlink:label="loc_us-gaap_NumberOfOperatingSegments_75F5CE1FE2547DE9299B6D622F859B12" xlink:type="locator"/>

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<link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_B00D81FC9EDAA4FF67C06D622F85AC1C_netLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_B00D81FC9EDAA4FF67C06D622F85AC1C" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US"> Revenue </link:label>

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<link:label id="lab_tgen_IdentifiableAssets_66DB7B8A3EAFA1BAE20C6D622F85A05A_terseLabel_en-US" xlink:label="lab_tgen_IdentifiableAssets_66DB7B8A3EAFA1BAE20C6D622F85A05A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Identifiable Assets </link:label>

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<link:label id="lab_us-gaap_LeaseCost_F54BD172E23444B50DCD6D622FA4C04C_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCost_F54BD172E23444B50DCD6D622FA4C04C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease cost </link:label>

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<link:label id="lab_us-gaap_OperatingLeasePayments_DB0FCCCE304D316232286D622FA4686A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_DB0FCCCE304D316232286D622FA4686A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash paid for amounts included in the measurement of operating lease liabilities </link:label>

<link:label id="lab_us-gaap_OperatingLeasePayments_DB0FCCCE304D316232286D622FA4686A_label_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_DB0FCCCE304D316232286D622FA4686A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Payments </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="loc_us-gaap_OperatingLeasePayments_DB0FCCCE304D316232286D622FA4686A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasePayments_DB0FCCCE304D316232286D622FA4686A" xlink:to="lab_us-gaap_OperatingLeasePayments_DB0FCCCE304D316232286D622FA4686A" xlink:type="arc"/>

<link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_F6B832DB70BFD80898BC6D622FA41EF0_terseLabel_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_F6B832DB70BFD80898BC6D622FA41EF0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Right-of-use assets obtained in exchange for operating lease liabilities </link:label>

<link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_F6B832DB70BFD80898BC6D622FA41EF0_label_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_F6B832DB70BFD80898BC6D622FA41EF0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Right-of-Use Asset Obtained in Exchange for Operating Lease Liability </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_F6B832DB70BFD80898BC6D622FA41EF0" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_F6B832DB70BFD80898BC6D622FA41EF0" xlink:to="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_F6B832DB70BFD80898BC6D622FA41EF0" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_492FF1C0CC45DF2D9DE96D622FA42FB8_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_492FF1C0CC45DF2D9DE96D622FA42FB8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average remaining lease term - operating leases </link:label>

<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_492FF1C0CC45DF2D9DE96D622FA42FB8_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_492FF1C0CC45DF2D9DE96D622FA42FB8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Weighted Average Remaining Lease Term </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_492FF1C0CC45DF2D9DE96D622FA42FB8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_492FF1C0CC45DF2D9DE96D622FA42FB8" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_492FF1C0CC45DF2D9DE96D622FA42FB8" xlink:type="arc"/>

<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_CC63EF363DC1D6167CA66D622FA4A61A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_CC63EF363DC1D6167CA66D622FA4A61A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted-average discount rate - operating leases (percent) </link:label>

<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_CC63EF363DC1D6167CA66D622FA4A61A_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_CC63EF363DC1D6167CA66D622FA4A61A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Weighted Average Discount Rate, Percent </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_CC63EF363DC1D6167CA66D622FA4A61A" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_CC63EF363DC1D6167CA66D622FA4A61A" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_CC63EF363DC1D6167CA66D622FA4A61A" xlink:type="arc"/>

<link:label id="lab_us-gaap_IntangibleAssetsDisclosureTextBlock_55B95F1CDEE5B377C39F6D622ED9AEB8_terseLabel_en-US" xlink:label="lab_us-gaap_IntangibleAssetsDisclosureTextBlock_55B95F1CDEE5B377C39F6D622ED9AEB8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intangible Assets and Liabilities Other Than Goodwill </link:label>

<link:label id="lab_us-gaap_IntangibleAssetsDisclosureTextBlock_55B95F1CDEE5B377C39F6D622ED9AEB8_label_en-US" xlink:label="lab_us-gaap_IntangibleAssetsDisclosureTextBlock_55B95F1CDEE5B377C39F6D622ED9AEB8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Intangible Assets Disclosure [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IntangibleAssetsDisclosureTextBlock" xlink:label="loc_us-gaap_IntangibleAssetsDisclosureTextBlock_55B95F1CDEE5B377C39F6D622ED9AEB8" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IntangibleAssetsDisclosureTextBlock_55B95F1CDEE5B377C39F6D622ED9AEB8" xlink:to="lab_us-gaap_IntangibleAssetsDisclosureTextBlock_55B95F1CDEE5B377C39F6D622ED9AEB8" xlink:type="arc"/>

<link:label id="lab_us-gaap_LesseeOperatingLeasesTextBlock_C313F45475720397FB4F6D622FF2B7D6_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeasesTextBlock_C313F45475720397FB4F6D622FF2B7D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Leases </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeasesTextBlock_C313F45475720397FB4F6D622FF2B7D6_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeasesTextBlock_C313F45475720397FB4F6D622FF2B7D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Leases [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeasesTextBlock" xlink:label="loc_us-gaap_LesseeOperatingLeasesTextBlock_C313F45475720397FB4F6D622FF2B7D6" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeasesTextBlock_C313F45475720397FB4F6D622FF2B7D6" xlink:to="lab_us-gaap_LesseeOperatingLeasesTextBlock_C313F45475720397FB4F6D622FF2B7D6" xlink:type="arc"/>

<link:label id="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_40635CFD7748BE6A903A3785642F4A98_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_40635CFD7748BE6A903A3785642F4A98" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Sale of Energy Producing Assets and Goodwill Impairment </link:label>

<link:label id="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_40635CFD7748BE6A903A3785642F4A98_label_en-US" xlink:label="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_40635CFD7748BE6A903A3785642F4A98" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_40635CFD7748BE6A903A3785642F4A98" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_40635CFD7748BE6A903A3785642F4A98" xlink:to="lab_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock_40635CFD7748BE6A903A3785642F4A98" xlink:type="arc"/>

<link:label id="lab_us-gaap_LossContingenciesTable_A52F49CBF6702C59592437A4AB9A0B2B_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesTable_A52F49CBF6702C59592437A4AB9A0B2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Loss Contingencies [Table] </link:label>

<link:label id="lab_us-gaap_LossContingenciesTable_A52F49CBF6702C59592437A4AB9A0B2B_label_en-US" xlink:label="lab_us-gaap_LossContingenciesTable_A52F49CBF6702C59592437A4AB9A0B2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Loss Contingencies [Table] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_A52F49CBF6702C59592437A4AB9A0B2B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesTable_A52F49CBF6702C59592437A4AB9A0B2B" xlink:to="lab_us-gaap_LossContingenciesTable_A52F49CBF6702C59592437A4AB9A0B2B" xlink:type="arc"/>

<link:label id="lab_us-gaap_LossContingenciesLineItems_2704C16FD503666CC6F737A4ABAA1F61_terseLabel_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_2704C16FD503666CC6F737A4ABAA1F61" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Loss Contingencies [Line Items] </link:label>

<link:label id="lab_us-gaap_LossContingenciesLineItems_2704C16FD503666CC6F737A4ABAA1F61_label_en-US" xlink:label="lab_us-gaap_LossContingenciesLineItems_2704C16FD503666CC6F737A4ABAA1F61" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Loss Contingencies [Line Items] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_2704C16FD503666CC6F737A4ABAA1F61" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LossContingenciesLineItems_2704C16FD503666CC6F737A4ABAA1F61" xlink:to="lab_us-gaap_LossContingenciesLineItems_2704C16FD503666CC6F737A4ABAA1F61" xlink:type="arc"/>

<link:label id="lab_us-gaap_GuaranteesFairValueDisclosure_773559E57C3F81B48BE9378563E1B252_terseLabel_en-US" xlink:label="lab_us-gaap_GuaranteesFairValueDisclosure_773559E57C3F81B48BE9378563E1B252" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Guarantee of obligations of Eurosite Power, Inc. </link:label>

<link:label id="lab_us-gaap_GuaranteesFairValueDisclosure_773559E57C3F81B48BE9378563E1B252_label_en-US" xlink:label="lab_us-gaap_GuaranteesFairValueDisclosure_773559E57C3F81B48BE9378563E1B252" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Guarantees, Fair Value Disclosure </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GuaranteesFairValueDisclosure" xlink:label="loc_us-gaap_GuaranteesFairValueDisclosure_773559E57C3F81B48BE9378563E1B252" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GuaranteesFairValueDisclosure_773559E57C3F81B48BE9378563E1B252" xlink:to="lab_us-gaap_GuaranteesFairValueDisclosure_773559E57C3F81B48BE9378563E1B252" xlink:type="arc"/>

<link:label id="lab_us-gaap_GuaranteeObligationsMaximumExposure_931C1EDA5948EBE5D397378563E18E0B_terseLabel_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsMaximumExposure_931C1EDA5948EBE5D397378563E18E0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Guarantee liability </link:label>

<link:label id="lab_us-gaap_GuaranteeObligationsMaximumExposure_931C1EDA5948EBE5D397378563E18E0B_label_en-US" xlink:label="lab_us-gaap_GuaranteeObligationsMaximumExposure_931C1EDA5948EBE5D397378563E18E0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Guarantor Obligations, Maximum Exposure, Undiscounted </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GuaranteeObligationsMaximumExposure" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_931C1EDA5948EBE5D397378563E18E0B" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GuaranteeObligationsMaximumExposure_931C1EDA5948EBE5D397378563E18E0B" xlink:to="lab_us-gaap_GuaranteeObligationsMaximumExposure_931C1EDA5948EBE5D397378563E18E0B" xlink:type="arc"/>

<link:label id="lab_us-gaap_NatureOfOperations_CA3D0303A387270C22276D622F08D614_terseLabel_en-US" xlink:label="lab_us-gaap_NatureOfOperations_CA3D0303A387270C22276D622F08D614" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Description of business and basis of presentation </link:label>

<link:label id="lab_us-gaap_NatureOfOperations_CA3D0303A387270C22276D622F08D614_label_en-US" xlink:label="lab_us-gaap_NatureOfOperations_CA3D0303A387270C22276D622F08D614" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Nature of Operations [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NatureOfOperations" xlink:label="loc_us-gaap_NatureOfOperations_CA3D0303A387270C22276D622F08D614" xlink:type="locator"/>

<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NatureOfOperations_CA3D0303A387270C22276D622F08D614" xlink:to="lab_us-gaap_NatureOfOperations_CA3D0303A387270C22276D622F08D614" xlink:type="arc"/>

<link:label id="lab_us-gaap_DebtDisclosureTextBlock_F5AF7D055D27FB73EE516D622F94F4EA_terseLabel_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_F5AF7D055D27FB73EE516D622F94F4EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving Line of Credit, Bank </link:label>

<link:label id="lab_us-gaap_DebtDisclosureTextBlock_F5AF7D055D27FB73EE516D622F94F4EA_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureTextBlock_F5AF7D055D27FB73EE516D622F94F4EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Disclosure [Text Block] </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="loc_us-gaap_DebtDisclosureTextBlock_F5AF7D055D27FB73EE516D622F94F4EA" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_B1591E1EE83D66B7CE2C37856420724F_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_B1591E1EE83D66B7CE2C37856420724F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Q4 2019 </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_B1591E1EE83D66B7CE2C37856420724F_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_B1591E1EE83D66B7CE2C37856420724F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year </link:label>

<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_B1591E1EE83D66B7CE2C37856420724F" xlink:type="locator"/>

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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_B51594B357413505CFA33785642060E2_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_B51594B357413505CFA33785642060E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_B51594B357413505CFA33785642060E2_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_B51594B357413505CFA33785642060E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Year Two </link:label>

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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9D5556889B8892DDAB50378564203EA5_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_9D5556889B8892DDAB50378564203EA5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Year Three </link:label>

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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_7C870DF387347E62483337856420CE50_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_7C870DF387347E62483337856420CE50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Thereafter </link:label>

<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_7C870DF387347E62483337856420CE50_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_7C870DF387347E62483337856420CE50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due after Year Five </link:label>

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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_3285D4AA64AA9EAEAB3037856420FFC8" xlink:type="locator"/>

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Filing Submission 0001537435-19-000048 – Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Tecogen Inc. – ‘10-Q’ for 9/30/19 – ‘EX-101.LAB’

On: Tuesday, 11/12/19, at 1:08pm ET · For: 9/30/19 · Accession #: 1537435-19-48 · File #: 1-36103

Previous ‘10-Q’: ‘10-Q’ on 8/13/19 for 6/30/19 · Next: ‘10-Q’ on 5/14/20 for 3/31/20 · Latest: ‘10-Q’ on 11/9/23 for 9/30/23

Quarterly Report — Form 10-Q — Sect. 13 / 15(d) – SEA’34Filing Table of Contents

‘EX-101.LAB’ — XBRL Labels — tgen-20190930_lab

This Exhibit is an XBRL XML File.

Quarterly Report — Form 10-Q — Sect. 13 / 15(d) – SEA’34
Filing Table of Contents