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Mdu Resources Group Inc. – ‘10-K’ for 12/31/21 – ‘EX-101.SCH’

On:  Wednesday, 2/23/22, at 12:06pm ET   ·   For:  12/31/21   ·   Accession #:  67716-22-12   ·   File #:  1-03480

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

 2/23/22  Mdu Resources Group Inc.          10-K       12/31/21  161:38M

Annual Report   —   Form 10-K

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Mdu Resources 2021 Form 10-K                        HTML   2.57M 
 2: EX-10.K     Mdu Resources Long-Term Performance Incentive Plan  HTML     71K 
 3: EX-10.M     Mdu Resources Restrictive Stock Unit Award          HTML     59K 
                Agreement                                                        
 4: EX-10.W     Mdu Resources 401 K Retirement Plan Amendment       HTML     46K 
                01-01-22                                                         
 5: EX-21       Mdu Resources Subsidiaries of Mdu Resources         HTML     49K 
 6: EX-23       Mdu Resources Consent of Independent Accounting     HTML     36K 
                Firm                                                             
10: EX-95       Mdu Resources Mine Safety Disclosures               HTML    109K 
 7: EX-31.A     Mdu Resources Certification of Chief Executive      HTML     40K 
                Officer                                                          
 8: EX-31.B     Mdu Resources Certification of Chief Financial      HTML     40K 
                Officer                                                          
 9: EX-32       Mdu Resources Certification of CEO and CFO          HTML     38K 
16: R1          Cover page                                          HTML    101K 
17: R2          Audit Information                                   HTML     42K 
18: R3          Consolidated Statements of Income                   HTML    144K 
19: R4          Consolidated Statements of Comprehensive Income     HTML     96K 
20: R5          Consolidated Balance Sheets                         HTML    206K 
21: R6          Consolidated Statements of Equity                   HTML    112K 
22: R7          Consolidated Statements of Cash Flows               HTML    147K 
23: R8          Basis of Presentation                               HTML     45K 
24: R9          Accounting Policies                                 HTML    147K 
25: R10         Revenue from Contract with Customer                 HTML    215K 
26: R11         Business Combinations                               HTML     45K 
27: R12         Property, Plant, and Equipment                      HTML     85K 
28: R13         Regulatory assets and liabilities                   HTML     90K 
29: R14         Goodwill and other intangible assets                HTML     81K 
30: R15         Fair value measurements                             HTML    100K 
31: R16         Debt                                                HTML     99K 
32: R17         Leases                                              HTML     62K 
33: R18         Asset retirement obligations                        HTML     51K 
34: R19         Equity                                              HTML     53K 
35: R20         Stock-Based Compensation                            HTML     62K 
36: R21         Accumulated other comprehensive loss                HTML     75K 
37: R22         Income Taxes                                        HTML    120K 
38: R23         Cash flow information                               HTML     56K 
39: R24         Business segment data                               HTML    200K 
40: R25         Employee benefit plans                              HTML    392K 
41: R26         Jointly owned facilities                            HTML     66K 
42: R27         Regulatory matters                                  HTML     43K 
43: R28         Commitments and contingencies                       HTML     67K 
44: R29         Schedule I-Condensed Financial Information of       HTML    120K 
                Registrant                                                       
45: R30         Basis of Presentation (Policies)                    HTML     51K 
46: R31         Accounting Policies (Policies)                      HTML    130K 
47: R32         Revenue from Contract with Customer (Policies)      HTML     42K 
48: R33         Accumulated other comprehensive loss (Policies)     HTML     38K 
49: R34         Business segment data (Policies)                    HTML     40K 
50: R35         Commitment and Contingencies (Policies)             HTML     40K 
51: R36         Accounting Policies (Tables)                        HTML    105K 
52: R37         Revenue from contracts with customers (Tables)      HTML    208K 
53: R38         Property, Plant, and Equipment (Tables)             HTML     84K 
54: R39         Regulatory assets and liabilities (Tables)          HTML    135K 
55: R40         Goodwill and other intangible assets (Tables)       HTML     86K 
56: R41         Fair value measurements (Tables)                    HTML     98K 
57: R42         Debt (Tables)                                       HTML     91K 
58: R43         Leases (Tables)                                     HTML     60K 
59: R44         Asset Retirement Obligations (Tables)               HTML     49K 
60: R45         Equity (Tables)                                     HTML     48K 
61: R46         Stock-Based Compensation (Tables)                   HTML     62K 
62: R47         Accumulated other comprehensive loss (Tables)       HTML     76K 
63: R48         Income Taxes (Tables)                               HTML    125K 
64: R49         Cash flow information (Tables)                      HTML     56K 
65: R50         Business segment data (Tables)                      HTML    192K 
66: R51         Employee Benefit Plans (Tables)                     HTML    388K 
67: R52         Jointly owned facilities (Tables)                   HTML     66K 
68: R53         Commitment and Contingencies Disclosure (Tables)    HTML     45K 
69: R54         Accounting Policies - Receivables Past Due 90 Days  HTML     39K 
                (Details 1)                                                      
70: R55         Accounting Policies - CECL Table (Details 2)        HTML     67K 
71: R56         Accounting Policies - Accrued Unbilled Revenue      HTML     38K 
                (Details 3)                                                      
72: R57         Accounting Policies - Retainage (Details 4)         HTML     45K 
73: R58         Accounting Policies - Inventory (Details 5)         HTML     54K 
74: R59         Accounting Policies - PPE (Details 6)               HTML     42K 
75: R60         Accounting Policies - Impairment of Long-Lived      HTML     39K 
                Assets (Details 7)                                               
76: R61         Natural Gas Costs Recoverable or Refundable         HTML     41K 
                through Rate Adjustments (Details 8)                             
77: R62         Accounting Policies - Goodwill (Details 9)          HTML     39K 
78: R63         Accounting Policies - Joint Ventures (Details 10)   HTML     70K 
79: R64         Accounting Policies - Derivatives (Details 11)      HTML     41K 
80: R65         Accounting Policies - EPS (Details 12)              HTML     46K 
81: R66         Accounting Policies - Income Taxes (Details 13)     HTML     38K 
82: R67         Disaggregation of revenue (Details)                 HTML    141K 
83: R68         Contract balances (Details 2)                       HTML     59K 
84: R69         Revenue from contracts with customers Remaining     HTML     49K 
                performance obligations (Details 3)                              
85: R70         Business Combinations (Details)                     HTML     65K 
86: R71         Business Combinations - Assets Acquired &           HTML     68K 
                Liabilities Assumed (Details 2)                                  
87: R72         Property, Plant, and Equipment (Details)            HTML    121K 
88: R73         Regulatory assets (Details)                         HTML     87K 
89: R74         Regulatory liabilities (Details 2)                  HTML     68K 
90: R75         Goodwill rollforward (Details)                      HTML     54K 
91: R76         Other intangible assets (Details 2)                 HTML     55K 
92: R77         Future amortization expense (Details 3)             HTML     50K 
93: R78         Fair value measurements insurance contracts         HTML     42K 
                (Details)                                                        
94: R79         Available-for-sale securities (Details 2)           HTML     53K 
95: R80         Fair value measurements (Details 3)                 HTML     69K 
96: R81         Fair value measurements (Details 5)                 HTML     47K 
97: R82         Credit facilities (Details)                         HTML     66K 
98: R83         Short-term Debt (Details 2)                         HTML     45K 
99: R84         Long-term debt outstanding (Details 3)              HTML     68K 
100: R85         Long-term borrowings (Details 4)                    HTML     82K  
101: R86         Schedule of debt maturities (Details 5)             HTML     54K  
102: R87         Lease costs (Details)                               HTML     53K  
103: R88         Operating lease liabilities undiscounted cash       HTML     56K  
                flows maturity schedule (Details 2)                              
104: R89         Lessor accounting (Details 3)                       HTML     41K  
105: R90         Asset Retirement Obligations (Details)              HTML     54K  
106: R91         Common stock (Details)                              HTML     49K  
107: R92         Common stock Common stock issuance (Details 2)      HTML     53K  
108: R93         Preferred Stock (Details 3)                         HTML     44K  
109: R94         Stock based compensation plans (Details)            HTML     46K  
110: R95         Stock awards (Details 2)                            HTML     42K  
111: R96         Restricted stock awards (Details 3)                 HTML     43K  
112: R97         Performance share awards (Details 4)                HTML    105K  
113: R98         Accumulated other comprehensive loss (Details)      HTML     70K  
114: R99         Reclassification out of accumulated other           HTML     72K  
                comprehensive loss (Details 2)                                   
115: R100        Components of income before income taxes from       HTML     47K  
                continuing operations (Details)                                  
116: R101        Income tax expense (Benefit) (Details 2)            HTML     64K  
117: R102        Components of deferred tax assets and liabilities   HTML     76K  
                (Details 3)                                                      
118: R103        Carryforwards (Details 4)                           HTML     46K  
119: R104        Deferred tax reconciliation (Details 5)             HTML     48K  
120: R105        Income tax expense (Benefit) Statutory Rate Versus  HTML     74K  
                Actual Rate (Details 6)                                          
121: R106        Cash flow information (Details)                     HTML     54K  
122: R107        Business segment data (Details)                     HTML    172K  
123: R108        Change in benefit obligations and plan assets       HTML    124K  
                (Details)                                                        
124: R109        Benefit obligations in excess of plan assets        HTML     49K  
                (Details 2)                                                      
125: R110        Components of net periodic benefit cost (Details    HTML     99K  
                3)                                                               
126: R111        Weighted average assumptions (Details 4)            HTML     61K  
127: R112        Investment Allocations (Details 5)                  HTML     55K  
128: R113        Health care rate assumptions and cost trend rate    HTML     47K  
                (Details 6)                                                      
129: R114        Estimated future benefit payments and subsidies     HTML     78K  
                (Details 7)                                                      
130: R115        Fair value - pension (Details 8)                    HTML     99K  
131: R116        Fair value - other postretirement (Details 9)       HTML     94K  
132: R117        Nonqualified Benefit Plans Benefit Obligations      HTML     46K  
                (Details 10)                                                     
133: R118        Nonqualified Benefit Plans Components of NPBC       HTML     53K  
                (Details 11)                                                     
134: R119        Nonqualified Benefit Plans Weighted Average         HTML     45K  
                Assumptions (Details 12)                                         
135: R120        Nonqualified Benefit Plans Future Benefit Payments  HTML     53K  
                (Details 13)                                                     
136: R121        Nonqualified Benefit Plans Contributions (Details   HTML     42K  
                14)                                                              
137: R122        Nonqualified Benefit Plans Investments (Details     HTML     48K  
                15)                                                              
138: R123        Defined Contribution Benefit Plans Contribution     HTML     40K  
                (Details 16)                                                     
139: R124        Multiemployer Plans Zones (Details 17)              HTML     47K  
140: R125        Multiemployer Plans Participation by Plan (Details  HTML    130K  
                18)                                                              
141: R126        Multiemployer Plan Contributions (Details 19)       HTML     44K  
142: R127        Jointly owned facilities (Details)                  HTML     62K  
143: R128        Mnpuc (Details)                                     HTML     43K  
144: R129        Ndpsc (Details 2)                                   HTML     45K  
145: R130        Sdpuc (Details 3)                                   HTML     42K  
146: R131        Wutc (Details 4)                                    HTML     45K  
147: R132        Ferc (Details 5)                                    HTML     43K  
148: R133        Litigation (Details)                                HTML     42K  
149: R134        Enviromental matters (Details 2)                    HTML     70K  
150: R135        Purchase commitments (Details 3)                    HTML     57K  
151: R136        Guarantees (Details 4)                              HTML     62K  
152: R137        Variable interest entities (Details 5)              HTML     40K  
153: R138        Condensed Statements of Income and Comprehensive    HTML     57K  
                Income (Details)                                                 
154: R139        Condensed Balance Sheets (Details 2)                HTML    183K  
155: R140        Condensed Statements of Cash Flows (Details 3)      HTML     79K  
156: R141        Notes to Condensed Financial Statements (Details    HTML     40K  
                4)                                                               
159: XML         IDEA XML File -- Filing Summary                      XML    292K  
157: XML         XBRL Instance -- mdu-20211231_htm                    XML   6.68M  
158: EXCEL       IDEA Workbook of Financial Reports                  XLSX    226K  
12: EX-101.CAL  XBRL Calculations -- mdu-20211231_cal                XML    247K 
13: EX-101.DEF  XBRL Definitions -- mdu-20211231_def                 XML   1.91M 
14: EX-101.LAB  XBRL Labels -- mdu-20211231_lab                      XML   3.18M 
15: EX-101.PRE  XBRL Presentations -- mdu-20211231_pre               XML   2.26M 
11: EX-101.SCH  XBRL Schema -- mdu-20211231                          XSD    332K 
160: JSON        XBRL Instance as JSON Data -- MetaLinks              750±  1.05M  
161: ZIP         XBRL Zipped Folder -- 0000067716-22-000012-xbrl      Zip   6.22M

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<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="AccountingPoliciesEPSDetails12" roleURI="http://www.mdu.com/role/AccountingPoliciesEPSDetails12">
<link:definition> 240174012 - Disclosure - Accounting Policies - EPS (Details 12) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="AccountingPoliciesIncomeTaxesDetails13" roleURI="http://www.mdu.com/role/AccountingPoliciesIncomeTaxesDetails13">
<link:definition> 240184013 - Disclosure - Accounting Policies - Income Taxes (Details 13) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RevenuefromContractwithCustomer" roleURI="http://www.mdu.com/role/RevenuefromContractwithCustomer">
<link:definition> 210191003 - Disclosure - Revenue from Contract with Customer </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RevenuefromContractwithCustomerPolicies" roleURI="http://www.mdu.com/role/RevenuefromContractwithCustomerPolicies">
<link:definition> 220202003 - Disclosure - Revenue from Contract with Customer (Policies) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RevenuefromcontractswithcustomersTables" roleURI="http://www.mdu.com/role/RevenuefromcontractswithcustomersTables">
<link:definition> 230213002 - Disclosure - Revenue from contracts with customers (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="DisaggregationofrevenueDetails" roleURI="http://www.mdu.com/role/DisaggregationofrevenueDetails">
<link:definition> 240224014 - Disclosure - Disaggregation of revenue (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="ContractbalancesDetails2" roleURI="http://www.mdu.com/role/ContractbalancesDetails2">
<link:definition> 240234015 - Disclosure - Contract balances (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RevenuefromcontractswithcustomersRemainingperformanceobligationsDetails3" roleURI="http://www.mdu.com/role/RevenuefromcontractswithcustomersRemainingperformanceobligationsDetails3">
<link:definition> 240244016 - Disclosure - Revenue from contracts with customers Remaining performance obligations (Details 3) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RevenuefromcontractswithcustomersRemainingperformanceobligationsDetails3_1" roleURI="http://www.mdu.com/role/RevenuefromcontractswithcustomersRemainingperformanceobligationsDetails3_1">
<link:definition> 240244016 - Disclosure - Revenue from contracts with customers Remaining performance obligations (Details 3) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="BusinessCombinations" roleURI="http://www.mdu.com/role/BusinessCombinations">
<link:definition> 210251004 - Disclosure - Business Combinations </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="BusinessCombinationsDetails" roleURI="http://www.mdu.com/role/BusinessCombinationsDetails">
<link:definition> 240264017 - Disclosure - Business Combinations (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="BusinessCombinationsAssetsAcquiredLiabilitiesAssumedDetails2" roleURI="http://www.mdu.com/role/BusinessCombinationsAssetsAcquiredLiabilitiesAssumedDetails2">
<link:definition> 240274018 - Disclosure - Business Combinations - Assets Acquired & Liabilities Assumed (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PropertyPlantandEquipment" roleURI="http://www.mdu.com/role/PropertyPlantandEquipment">
<link:definition> 210281005 - Disclosure - Property, Plant, and Equipment </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PropertyPlantandEquipmentTables" roleURI="http://www.mdu.com/role/PropertyPlantandEquipmentTables">
<link:definition> 230293003 - Disclosure - Property, Plant, and Equipment (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PropertyPlantandEquipmentDetails" roleURI="http://www.mdu.com/role/PropertyPlantandEquipmentDetails">
<link:definition> 240304019 - Disclosure - Property, Plant, and Equipment (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Regulatoryassetsandliabilities" roleURI="http://www.mdu.com/role/Regulatoryassetsandliabilities">
<link:definition> 210311006 - Disclosure - Regulatory assets and liabilities </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RegulatoryassetsandliabilitiesTables" roleURI="http://www.mdu.com/role/RegulatoryassetsandliabilitiesTables">
<link:definition> 230323004 - Disclosure - Regulatory assets and liabilities (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RegulatoryassetsDetails" roleURI="http://www.mdu.com/role/RegulatoryassetsDetails">
<link:definition> 240334020 - Disclosure - Regulatory assets (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RegulatoryliabilitiesDetails2" roleURI="http://www.mdu.com/role/RegulatoryliabilitiesDetails2">
<link:definition> 240344021 - Disclosure - Regulatory liabilities (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Goodwillandotherintangibleassets" roleURI="http://www.mdu.com/role/Goodwillandotherintangibleassets">
<link:definition> 210351007 - Disclosure - Goodwill and other intangible assets </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="GoodwillandotherintangibleassetsTables" roleURI="http://www.mdu.com/role/GoodwillandotherintangibleassetsTables">
<link:definition> 230363005 - Disclosure - Goodwill and other intangible assets (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="GoodwillrollforwardDetails" roleURI="http://www.mdu.com/role/GoodwillrollforwardDetails">
<link:definition> 240374022 - Disclosure - Goodwill rollforward (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="OtherintangibleassetsDetails2" roleURI="http://www.mdu.com/role/OtherintangibleassetsDetails2">
<link:definition> 240384023 - Disclosure - Other intangible assets (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="FutureamortizationexpenseDetails3" roleURI="http://www.mdu.com/role/FutureamortizationexpenseDetails3">
<link:definition> 240394024 - Disclosure - Future amortization expense (Details 3) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Fairvaluemeasurements" roleURI="http://www.mdu.com/role/Fairvaluemeasurements">
<link:definition> 210401008 - Disclosure - Fair value measurements </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="FairvaluemeasurementsTables" roleURI="http://www.mdu.com/role/FairvaluemeasurementsTables">
<link:definition> 230413006 - Disclosure - Fair value measurements (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="FairvaluemeasurementsinsurancecontractsDetails" roleURI="http://www.mdu.com/role/FairvaluemeasurementsinsurancecontractsDetails">
<link:definition> 240424025 - Disclosure - Fair value measurements insurance contracts (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="AvailableforsalesecuritiesDetails2" roleURI="http://www.mdu.com/role/AvailableforsalesecuritiesDetails2">
<link:definition> 240434026 - Disclosure - Available-for-sale securities (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="FairvaluemeasurementsDetails3" roleURI="http://www.mdu.com/role/FairvaluemeasurementsDetails3">
<link:definition> 240444027 - Disclosure - Fair value measurements (Details 3) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="FairvaluemeasurementsDetails5" roleURI="http://www.mdu.com/role/FairvaluemeasurementsDetails5">
<link:definition> 240454028 - Disclosure - Fair value measurements (Details 5) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Debt" roleURI="http://www.mdu.com/role/Debt">
<link:definition> 210461009 - Disclosure - Debt </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="DebtTables" roleURI="http://www.mdu.com/role/DebtTables">
<link:definition> 230473007 - Disclosure - Debt (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="CreditfacilitiesDetails" roleURI="http://www.mdu.com/role/CreditfacilitiesDetails">
<link:definition> 240484029 - Disclosure - Credit facilities (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="ShorttermDebtDetails2" roleURI="http://www.mdu.com/role/ShorttermDebtDetails2">
<link:definition> 240494030 - Disclosure - Short-term Debt (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="LongtermdebtoutstandingDetails3" roleURI="http://www.mdu.com/role/LongtermdebtoutstandingDetails3">
<link:definition> 240504031 - Disclosure - Long-term debt outstanding (Details 3) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="LongtermborrowingsDetails4" roleURI="http://www.mdu.com/role/LongtermborrowingsDetails4">
<link:definition> 240514032 - Disclosure - Long-term borrowings (Details 4) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="ScheduleofdebtmaturitiesDetails5" roleURI="http://www.mdu.com/role/ScheduleofdebtmaturitiesDetails5">
<link:definition> 240524033 - Disclosure - Schedule of debt maturities (Details 5) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Leases" roleURI="http://www.mdu.com/role/Leases">
<link:definition> 210531010 - Disclosure - Leases </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="LeasesTables" roleURI="http://www.mdu.com/role/LeasesTables">
<link:definition> 230543008 - Disclosure - Leases (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="LeasecostsDetails" roleURI="http://www.mdu.com/role/LeasecostsDetails">
<link:definition> 240554034 - Disclosure - Lease costs (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="OperatingleaseliabilitiesundiscountedcashflowsmaturityscheduleDetails2" roleURI="http://www.mdu.com/role/OperatingleaseliabilitiesundiscountedcashflowsmaturityscheduleDetails2">
<link:definition> 240564035 - Disclosure - Operating lease liabilities undiscounted cash flows maturity schedule (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="LessoraccountingDetails3" roleURI="http://www.mdu.com/role/LessoraccountingDetails3">
<link:definition> 240574036 - Disclosure - Lessor accounting (Details 3) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Assetretirementobligations" roleURI="http://www.mdu.com/role/Assetretirementobligations">
<link:definition> 210581011 - Disclosure - Asset retirement obligations </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="AssetRetirementObligationsTables" roleURI="http://www.mdu.com/role/AssetRetirementObligationsTables">
<link:definition> 230593009 - Disclosure - Asset Retirement Obligations (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="AssetRetirementObligationsDetails" roleURI="http://www.mdu.com/role/AssetRetirementObligationsDetails">
<link:definition> 240604037 - Disclosure - Asset Retirement Obligations (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Equity" roleURI="http://www.mdu.com/role/Equity">
<link:definition> 210611012 - Disclosure - Equity </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="EquityTables" roleURI="http://www.mdu.com/role/EquityTables">
<link:definition> 230623010 - Disclosure - Equity (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="CommonstockDetails" roleURI="http://www.mdu.com/role/CommonstockDetails">
<link:definition> 240634038 - Disclosure - Common stock (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="CommonstockCommonstockissuanceDetails2" roleURI="http://www.mdu.com/role/CommonstockCommonstockissuanceDetails2">
<link:definition> 240644039 - Disclosure - Common stock Common stock issuance (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PreferredStockDetails3" roleURI="http://www.mdu.com/role/PreferredStockDetails3">
<link:definition> 240654040 - Disclosure - Preferred Stock (Details 3) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="StockBasedCompensation" roleURI="http://www.mdu.com/role/StockBasedCompensation">
<link:definition> 210661013 - Disclosure - Stock-Based Compensation </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="StockBasedCompensationTables" roleURI="http://www.mdu.com/role/StockBasedCompensationTables">
<link:definition> 230673011 - Disclosure - Stock-Based Compensation (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="StockbasedcompensationplansDetails" roleURI="http://www.mdu.com/role/StockbasedcompensationplansDetails">
<link:definition> 240684041 - Disclosure - Stock based compensation plans (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="StockawardsDetails2" roleURI="http://www.mdu.com/role/StockawardsDetails2">
<link:definition> 240694042 - Disclosure - Stock awards (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="RestrictedstockawardsDetails3" roleURI="http://www.mdu.com/role/RestrictedstockawardsDetails3">
<link:definition> 240704043 - Disclosure - Restricted stock awards (Details 3) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="PerformanceshareawardsDetails4" roleURI="http://www.mdu.com/role/PerformanceshareawardsDetails4">
<link:definition> 240714044 - Disclosure - Performance share awards (Details 4) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="Accumulatedothercomprehensiveloss" roleURI="http://www.mdu.com/role/Accumulatedothercomprehensiveloss">
<link:definition> 210721014 - Disclosure - Accumulated other comprehensive loss </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="AccumulatedothercomprehensivelossPolicies" roleURI="http://www.mdu.com/role/AccumulatedothercomprehensivelossPolicies">
<link:definition> 220732004 - Disclosure - Accumulated other comprehensive loss (Policies) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="AccumulatedothercomprehensivelossTables" roleURI="http://www.mdu.com/role/AccumulatedothercomprehensivelossTables">
<link:definition> 230743012 - Disclosure - Accumulated other comprehensive loss (Tables) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="AccumulatedothercomprehensivelossDetails" roleURI="http://www.mdu.com/role/AccumulatedothercomprehensivelossDetails">
<link:definition> 240754045 - Disclosure - Accumulated other comprehensive loss (Details) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="ReclassificationoutofaccumulatedothercomprehensivelossDetails2" roleURI="http://www.mdu.com/role/ReclassificationoutofaccumulatedothercomprehensivelossDetails2">
<link:definition> 240764046 - Disclosure - Reclassification out of accumulated other comprehensive loss (Details 2) </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
</link:roleType>
<link:roleType id="IncomeTaxes" roleURI="http://www.mdu.com/role/IncomeTaxes">
<link:definition> 210771015 - Disclosure - Income Taxes </link:definition>
<link:usedOn> link:presentationLink </link:usedOn>
<link:usedOn> link:calculationLink </link:usedOn>
<link:usedOn> link:definitionLink </link:usedOn>
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<xs:element id="mdu_Multiemployerplangreenzonestatusfundedpercentage" abstract="false" name="Multiemployerplangreenzonestatusfundedpercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_InvestmentsInAndAdvancesToSubsidiaries" abstract="false" name="InvestmentsInAndAdvancesToSubsidiaries" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_PensionTrustFundforOperatingEngineersMember" abstract="true" name="PensionTrustFundforOperatingEngineersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_ConstructionServicesMember" abstract="true" name="ConstructionServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_IbewLocalNo82PensionPlanMember" abstract="true" name="IbewLocalNo82PensionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_InvestmentInSubsidiaries" abstract="false" name="InvestmentInSubsidiaries" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_HistoricalVolitilityRate" abstract="false" name="HistoricalVolitilityRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_IncurredCostsForSiteRemedialInvestigationAndFeasibilityStudy" abstract="false" name="IncurredCostsForSiteRemedialInvestigationAndFeasibilityStudy" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_AccountsReceivableFromSubsidiaries" abstract="false" name="AccountsReceivableFromSubsidiaries" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ExcessDeferredIncomeTaxAmortization" abstract="false" name="ExcessDeferredIncomeTaxAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_FixedMaximumAmountsGuaranteedThereafter" abstract="false" name="FixedMaximumAmountsGuaranteedThereafter" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_RatioOfEarningsBeforeInterestAndTaxesToInterestExpenseAsSpecifiedInDebtConvenants" abstract="false" name="RatioOfEarningsBeforeInterestAndTaxesToInterestExpenseAsSpecifiedInDebtConvenants" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossAmortizationofActuarialGainLossbeforeTax" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossAmortizationofActuarialGainLossbeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_EnvironmentalMattersEstimatedCosts" abstract="false" name="EnvironmentalMattersEstimatedCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_Multiemployerplanredzonestatusfundedpercentage" abstract="false" name="Multiemployerplanredzonestatusfundedpercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_BellinghamWAManufacturedGasPlantSiteMember" abstract="true" name="BellinghamWAManufacturedGasPlantSiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DefinedBenefitPlanRegulatoryAssetsorLiabilitiesGainLossbeforeTax" abstract="false" name="DefinedBenefitPlanRegulatoryAssetsorLiabilitiesGainLossbeforeTax" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_EnvironmentalMattersInvestigativeCosts" abstract="false" name="EnvironmentalMattersInvestigativeCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ContractwithCustomerLiabilityNoncurrentChange" abstract="false" name="ContractwithCustomerLiabilityNoncurrentChange" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ShareBasedCompensationSharesSharesIssuedNetOfTaxWithholdings" abstract="false" name="ShareBasedCompensationSharesSharesIssuedNetOfTaxWithholdings" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
<xs:element id="mdu_ContractwithCustomerAssetsandLiabilitiesNet" abstract="false" name="ContractwithCustomerAssetsandLiabilitiesNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_AccountsPayableToSubsidiaries" abstract="false" name="AccountsPayableToSubsidiaries" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_DeferredTaxAssetsCustomerAdvances" abstract="false" name="DeferredTaxAssetsCustomerAdvances" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_GreatPlainsNaturalGasCo.Member" abstract="true" name="GreatPlainsNaturalGasCo.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_LettersofCreditSettoExpireinYear2" abstract="false" name="LettersofCreditSettoExpireinYear2" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_OtherUtilitySalesMember" abstract="true" name="OtherUtilitySalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_MaximumDistributionsToTheCompanyAsARatioOfAverageConsolidatedIndebtednessToConsolidatedEBITDA" abstract="false" name="MaximumDistributionsToTheCompanyAsARatioOfAverageConsolidatedIndebtednessToConsolidatedEBITDA" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_RegulatoryAssetsorLiabilitiesDefinedBenefitPlanGainLossAmortizationofActuarialGainLossbeforeTax" abstract="false" name="RegulatoryAssetsorLiabilitiesDefinedBenefitPlanGainLossAmortizationofActuarialGainLossbeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_PipelineandMidstreamMember" abstract="true" name="PipelineandMidstreamMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_IntermountainGasCompanyMember" abstract="true" name="IntermountainGasCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_WbiEnergyTransmissionIncMember" abstract="true" name="WbiEnergyTransmissionIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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<xs:element id="mdu_NaturalGasTransportationMember" abstract="true" name="NaturalGasTransportationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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<xs:element id="mdu_PensionAndRetirementPlanOfPlumbersAndPipefittersLocal525Member" abstract="true" name="PensionAndRetirementPlanOfPlumbersAndPipefittersLocal525Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_MISOMember" abstract="true" name="MISOMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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<xs:element id="mdu_DeferredTaxLiabilitiesOperatingLeaseRightofUseAssets" abstract="false" name="DeferredTaxLiabilitiesOperatingLeaseRightofUseAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ShareBasedCompensationValueIssuedSharesNetOfTaxWithholdings" abstract="false" name="ShareBasedCompensationValueIssuedSharesNetOfTaxWithholdings" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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<xs:element id="mdu_PublicUtilitiesJointlyOwnedFacilitiesDisclosureTextBlock" abstract="false" name="PublicUtilitiesJointlyOwnedFacilitiesDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
<xs:element id="mdu_AtthemarketofferingMember" abstract="true" name="AtthemarketofferingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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<xs:element id="mdu_PendingRateCaseMember" abstract="true" name="PendingRateCaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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<xs:element id="mdu_PercentageInvestmentInCommonStockOfLargeCapCompanies" abstract="false" name="PercentageInvestmentInCommonStockOfLargeCapCompanies" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
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<xs:element id="mdu_RenewableResourceCostAdjustmentRateTariff" abstract="false" name="RenewableResourceCostAdjustmentRateTariff" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_RegulatoryAssetsorLiabilitiesDefinedBenefitPlanPriorServiceCostCreditReclassificationAdjustmentfromAOCIbeforeTax" abstract="false" name="RegulatoryAssetsorLiabilitiesDefinedBenefitPlanPriorServiceCostCreditReclassificationAdjustmentfromAOCIbeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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<xs:element id="mdu_BigStoneStationMember" abstract="true" name="BigStoneStationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DefinedBenefitPlanAmountRecognizedinOtherComprehensiveIncomeLossbeforeTax" abstract="false" name="DefinedBenefitPlanAmountRecognizedinOtherComprehensiveIncomeLossbeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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<xs:element id="mdu_CentennialMember" abstract="true" name="CentennialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_ThresholdOfLikelihoodOfTaxPositionsBeingRealizedUponUltimateSettlementWithTaxingAuthority" abstract="false" name="ThresholdOfLikelihoodOfTaxPositionsBeingRealizedUponUltimateSettlementWithTaxingAuthority" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_PercentageInvestmentinCashandCashEquivalents" abstract="false" name="PercentageInvestmentinCashandCashEquivalents" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_DefinedBenefitPlanAmountRecognizedinNetPeriodicBenefitCostCreditandOtherComprehensiveIncomeLossorRegulatoryAssetsorLiabilitiesbeforeTaxTotal" abstract="false" name="DefinedBenefitPlanAmountRecognizedinNetPeriodicBenefitCostCreditandOtherComprehensiveIncomeLossorRegulatoryAssetsorLiabilitiesbeforeTaxTotal" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_IncurredCostsForSiteRemedialInvestigation" abstract="false" name="IncurredCostsForSiteRemedialInvestigation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_FuelContractMember" abstract="true" name="FuelContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_ImpliedVolatilityRate" abstract="false" name="ImpliedVolatilityRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_EnvironmentalMattersAccrualForRemedialInvestigationandFeasibilityStudyCosts" abstract="false" name="EnvironmentalMattersAccrualForRemedialInvestigationandFeasibilityStudyCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_LettersofCreditSettoExpireinNextFiscalYear" abstract="false" name="LettersofCreditSettoExpireinNextFiscalYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_DeferredTaxAssetsPayrollTaxDeferral" abstract="false" name="DeferredTaxAssetsPayrollTaxDeferral" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_IncomeTaxReconciliationChangeInNetDeferredIncomeTaxLiability" abstract="false" name="IncomeTaxReconciliationChangeInNetDeferredIncomeTaxLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_A2021AcquisitionMember" abstract="true" name="A2021AcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_NetNoncashInclusionofAcctPayandAFUDC" abstract="false" name="NetNoncashInclusionofAcctPayandAFUDC" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_DeferredIncomeTaxes" abstract="false" name="DeferredIncomeTaxes" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ContractingServicesMember" abstract="true" name="ContractingServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_AmountOutstandingUnderGuaranteesThatIsReflectedOnBalanceSheet" abstract="false" name="AmountOutstandingUnderGuaranteesThatIsReflectedOnBalanceSheet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ParticipantTargetGrantofSharesPercentageRateRange" abstract="false" name="ParticipantTargetGrantofSharesPercentageRateRange" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_LongtermPrivateShelfAgreementIssuanceCapacity" abstract="false" name="LongtermPrivateShelfAgreementIssuanceCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_AfudcAndInterestCapitailizedTableTextBlock" abstract="false" name="AfudcAndInterestCapitailizedTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
<xs:element id="mdu_IBEWLocalNo.357PensionPlanAMember" abstract="true" name="IBEWLocalNo.357PensionPlanAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_FixedMaximumAmountsGuaranteedByYearOne" abstract="false" name="FixedMaximumAmountsGuaranteedByYearOne" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_AssetRetirementObligationLiabilitiesAcquired" abstract="false" name="AssetRetirementObligationLiabilitiesAcquired" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_LiabilitiesRefundableGasCostsMember" abstract="true" name="LiabilitiesRefundableGasCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_Multiemployerplanyellowzonestatusfundedpercentage" abstract="false" name="Multiemployerplanyellowzonestatusfundedpercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
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<xs:element id="mdu_WygenIiiMember" abstract="true" name="WygenIiiMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_ScheduleOfChangeInNetDeferredIncomeTaxLiabilityReconciliationTableTextBlock" abstract="false" name="ScheduleOfChangeInNetDeferredIncomeTaxLiabilityReconciliationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
<xs:element id="mdu_CompanysExcludingItsSubsidiariesNetAssetsRestrictedFromUseForDividendPayments" abstract="false" name="CompanysExcludingItsSubsidiariesNetAssetsRestrictedFromUseForDividendPayments" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_MontanaDakotaUtilitiesCo.Member" abstract="true" name="MontanaDakotaUtilitiesCo.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_OptionToIncreaseBorrowingsMaximumAmount" abstract="false" name="OptionToIncreaseBorrowingsMaximumAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_GrantDateFebruary2020Member" abstract="true" name="GrantDateFebruary2020Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_ContractwithCustomerAssetNetCurrentChange" abstract="false" name="ContractwithCustomerAssetNetCurrentChange" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_WesternConferenceOfTeamstersPensionPlanMember" abstract="true" name="WesternConferenceOfTeamstersPensionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_GasStorageMember" abstract="true" name="GasStorageMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_ResidentialUtilitySalesMember" abstract="true" name="ResidentialUtilitySalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_TotalAssetsMeasuredatFairValueMember" abstract="true" name="TotalAssetsMeasuredatFairValueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_OtherComprehensiveIncomeLossDefinedBenefitPlanPriorServiceCostCreditReclassificationAdjustmentfromAOCIbeforeTax" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanPriorServiceCostCreditReclassificationAdjustmentfromAOCIbeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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<xs:element id="mdu_ContractReceivableRetainageTableTextBlock" abstract="false" name="ContractReceivableRetainageTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
<xs:element id="mdu_DefinedBenefitPlanPlanAssetsContributionsbyEmployerAdditionalContributions" abstract="false" name="DefinedBenefitPlanPlanAssetsContributionsbyEmployerAdditionalContributions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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<xs:element id="mdu_RatioofTotalDebttoTotalCapitalization" abstract="false" name="RatioofTotalDebttoTotalCapitalization" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_RatioOfFundedDebtToTotalCapitalizationAsSpecifiedInDebtConvenants" abstract="false" name="RatioOfFundedDebtToTotalCapitalizationAsSpecifiedInDebtConvenants" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_CollectiveAndMutualFundsMember" abstract="true" name="CollectiveAndMutualFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_RegulatoryAssetsorLiabilitiesDefinedBenefitPlanGainLossArisingDuringPeriodBeforeTax" abstract="false" name="RegulatoryAssetsorLiabilitiesDefinedBenefitPlanGainLossArisingDuringPeriodBeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_DefinedBenefitPlanNetPeriodicBenefitCostIncludingAmountCapitalized" abstract="false" name="DefinedBenefitPlanNetPeriodicBenefitCostIncludingAmountCapitalized" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ElectricFuelAndPurchasedPowerDeferralMember" abstract="true" name="ElectricFuelAndPurchasedPowerDeferralMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_TotalEstimatedCostsForSiteRemedialInvestigationAndFeasibilityStudy" abstract="false" name="TotalEstimatedCostsForSiteRemedialInvestigationAndFeasibilityStudy" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_PercentageInFixedIncomeAndOtherInvestments" abstract="false" name="PercentageInFixedIncomeAndOtherInvestments" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_LocalUnion212IbewPensionTrustFundMember" abstract="true" name="LocalUnion212IbewPensionTrustFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_ElectricMember" abstract="true" name="ElectricMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DeferredTaxIncreaseDecreaseReconciliationOtherComprehensiveIncome" abstract="false" name="DeferredTaxIncreaseDecreaseReconciliationOtherComprehensiveIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_WUTCMember" abstract="true" name="WUTCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_SouthernCaliforniaIBEWNECAPensionTrustFundMember" abstract="true" name="SouthernCaliforniaIBEWNECAPensionTrustFundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_NaturalGasCostsRecoverableOrRefundableThroughRateAdjustmentsPolicyTextBlock" abstract="false" name="NaturalGasCostsRecoverableOrRefundableThroughRateAdjustmentsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
<xs:element id="mdu_EdisonPensionPlanMember" abstract="true" name="EdisonPensionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_GeneralMember" abstract="true" name="GeneralMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_NaturalGasGatheringMember" abstract="true" name="NaturalGasGatheringMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_KPlanMember" abstract="true" name="KPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DefinedBenefitPlanIncreaseDecreaseRecognizedinRegulatoryAssetsorLiabilitiesbeforeTax" abstract="false" name="DefinedBenefitPlanIncreaseDecreaseRecognizedinRegulatoryAssetsorLiabilitiesbeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_MarketConditionMember" abstract="true" name="MarketConditionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_TermLoanAgreementMember" abstract="true" name="TermLoanAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_PooledSeparateAccountsMember" abstract="true" name="PooledSeparateAccountsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_NaturalGasDistributionMember" abstract="true" name="NaturalGasDistributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_BSSEMember" abstract="true" name="BSSEMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_EnvironmentalMattersEstimatedInvestigativeCosts" abstract="false" name="EnvironmentalMattersEstimatedInvestigativeCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ContractwithCustomerLiabilityCurrentChange" abstract="false" name="ContractwithCustomerLiabilityCurrentChange" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_MNPUCMember" abstract="true" name="MNPUCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_TransmissionFormulaRevenueRequirement" abstract="false" name="TransmissionFormulaRevenueRequirement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_PostretirementInvestmentsInInsuranceContracts" abstract="false" name="PostretirementInvestmentsInInsuranceContracts" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_ConcentrationRisksPercentageAbstract" abstract="true" name="ConcentrationRisksPercentageAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="mdu_AggregateReservesMember" abstract="true" name="AggregateReservesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_PercentageInvestmentInCommonStockOfSmallCapCompanies" abstract="false" name="PercentageInvestmentInCommonStockOfSmallCapCompanies" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_NDPSCMember" abstract="true" name="NDPSCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_PerformanceConditionMember" abstract="true" name="PerformanceConditionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DefinedBenefitPlanAmountofRegulatoryAssetsorLiabilitiesbeforeTax" abstract="false" name="DefinedBenefitPlanAmountofRegulatoryAssetsorLiabilitiesbeforeTax" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_MissoulaMTmanufacturedgasplantsiteMember" abstract="true" name="MissoulaMTmanufacturedgasplantsiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_PortlandHarborSiteMember" abstract="true" name="PortlandHarborSiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_PercentageInvestmentinTargetDateInvestments" abstract="false" name="PercentageInvestmentinTargetDateInvestments" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_Mulitiemployerplanyellowstatusfundedpercentage" abstract="false" name="Mulitiemployerplanyellowstatusfundedpercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_PercentageInvestmentInCommonStockOfMidCapCompanies" abstract="false" name="PercentageInvestmentInCommonStockOfMidCapCompanies" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_AggregatesHeldForResaleInventory" abstract="false" name="AggregatesHeldForResaleInventory" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_TotalEstimatedCostsForSiteRemediation" abstract="false" name="TotalEstimatedCostsForSiteRemediation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="mdu_AsphaltOilInventory" abstract="false" name="AsphaltOilInventory" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_FederalandStateTaxingAuthorityMember" abstract="true" name="FederalandStateTaxingAuthorityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DefinedContributionPlanMember" abstract="true" name="DefinedContributionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_TotalInfrastructureRider" abstract="false" name="TotalInfrastructureRider" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_JointVentureProportionateConsolidationMember" abstract="true" name="JointVentureProportionateConsolidationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_CommercialUtilitySalesMember" abstract="true" name="CommercialUtilitySalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DeferredChargesAndOtherAssetsAbstract" abstract="true" name="DeferredChargesAndOtherAssetsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="mdu_DefinedBenefitPlanRegulatoryAssetsorLiabilitiesNetPriorServiceCostCreditBeforeTax" abstract="false" name="DefinedBenefitPlanRegulatoryAssetsorLiabilitiesNetPriorServiceCostCreditBeforeTax" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ShareBasedCompensationArrangementByShareBasedPaymentAwardValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_LifeInsuranceCarriedOnPlanParticipantsMember" abstract="true" name="LifeInsuranceCarriedOnPlanParticipantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_CommercialPaperRevolvingCreditAgreementMember" abstract="true" name="CommercialPaperRevolvingCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_SiteContingencyLossExposureNotAccruedPreferredAlternativeEstimate" abstract="false" name="SiteContingencyLossExposureNotAccruedPreferredAlternativeEstimate" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_DefinedBenefitPlanAmountsRecognizedinRegulatoryAssetsLiabilitiesAbstract" abstract="true" name="DefinedBenefitPlanAmountsRecognizedinRegulatoryAssetsLiabilitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="mdu_CentennialEnergyHoldingsIncMember" abstract="true" name="CentennialEnergyHoldingsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_CascadeNaturalGasMember" abstract="true" name="CascadeNaturalGasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_CascadeNaturalGasCorporationMember" abstract="true" name="CascadeNaturalGasCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DeferredTaxLiabilitiesexpensebenefitRegulatoryAssets" abstract="false" name="DeferredTaxLiabilitiesexpensebenefitRegulatoryAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_GrantDateFebruary2021Member" abstract="true" name="GrantDateFebruary2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_EquityinEarningsLossofSubsidiariesFromDiscontinuedOperationsAttributabletotheCompany" abstract="false" name="EquityinEarningsLossofSubsidiariesFromDiscontinuedOperationsAttributabletotheCompany" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_FixedMaximumAmountsGuaranteedByYearFive" abstract="false" name="FixedMaximumAmountsGuaranteedByYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_MultiemployerPlansDefinedContributionMember" abstract="true" name="MultiemployerPlansDefinedContributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_IdahoPlumbersandPipefittersPensionPlanMember" abstract="true" name="IdahoPlumbersandPipefittersPensionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_AmountOfSuretyBondsOutstanding" abstract="false" name="AmountOfSuretyBondsOutstanding" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_InvestmentTaxCreditCarryforwardAmount" abstract="false" name="InvestmentTaxCreditCarryforwardAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_DeferredTaxAssetsOperatingLeaseLiabilities" abstract="false" name="DeferredTaxAssetsOperatingLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_DeferredTaxliabilitiesPostretirementBenefits" abstract="false" name="DeferredTaxliabilitiesPostretirementBenefits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_InvestmentsFromAndAdvancesFromSubsidiaries" abstract="false" name="InvestmentsFromAndAdvancesFromSubsidiaries" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_IndustrialUtilitySalesMember" abstract="true" name="IndustrialUtilitySalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_LettersOfCredit" abstract="false" name="LettersOfCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_InvestmentsInNonqualifiedBenefitPlans" abstract="false" name="InvestmentsInNonqualifiedBenefitPlans" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_RevenueFromContractsWithCustomersMember" abstract="true" name="RevenueFromContractsWithCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_BremertonWAManufacturedGasPlantSiteMember" abstract="true" name="BremertonWAManufacturedGasPlantSiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DefinedBenefitPlanNetPeriodicBenefitCostAmountCapitalized" abstract="false" name="DefinedBenefitPlanNetPeriodicBenefitCostAmountCapitalized" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ConstructionMaterialsMember" abstract="true" name="ConstructionMaterialsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_DeferredTaxReconciliationOther" abstract="false" name="DeferredTaxReconciliationOther" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_DefinedBenefitPlanRegulatoryAssetsLiabilitiesbeforeTaxAbstract" abstract="true" name="DefinedBenefitPlanRegulatoryAssetsLiabilitiesbeforeTaxAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
<xs:element id="mdu_SDPUCMember" abstract="true" name="SDPUCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_PostretirementInvestmentsInCollectiveAndMutualFunds" abstract="false" name="PostretirementInvestmentsInCollectiveAndMutualFunds" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_InsuranceInvestmentContractMember" abstract="true" name="InsuranceInvestmentContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
<xs:element id="mdu_RatioOfTotalDebtToTotalCapitalizationAsSpecifiedInDebtConvenants" abstract="false" name="RatioOfTotalDebtToTotalCapitalizationAsSpecifiedInDebtConvenants" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
<xs:element id="mdu_EnvironmentalMattersAccrualForSiteRemediation" abstract="false" name="EnvironmentalMattersAccrualForSiteRemediation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_ContractwithCustomerAssetsandLiabilitiesNetChange" abstract="false" name="ContractwithCustomerAssetsandLiabilitiesNetChange" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
<xs:element id="mdu_DiscontinuedOperationsMember" abstract="true" name="DiscontinuedOperationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>

3 Subsequent Filings that Reference this Filing

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

 2/23/24  MDU Resources Group, Inc.         S-8         2/23/24    5:92K                                    Toppan Merrill/FA
 2/22/24  MDU Resources Group, Inc.         10-K       12/31/23  161:31M
 2/24/23  MDU Resources Group, Inc.         10-K       12/31/22  172:39M

22 Previous Filings that this Filing References

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

11/04/21  MDU Resources Group, Inc.         10-Q        9/30/21  101:13M
 8/05/21  MDU Resources Group, Inc.         10-Q        6/30/21  100:12M
 5/06/21  MDU Resources Group, Inc.         10-Q        3/31/21   98:10M
 2/19/21  MDU Resources Group, Inc.         10-K       12/31/20  171:24M
11/12/20  MDU Resources Group, Inc.         8-K:5,9    11/12/20   14:486K
 5/08/20  MDU Resources Group, Inc.         10-Q        3/31/20  101:11M
 2/21/20  MDU Resources Group, Inc.         10-K       12/31/19  169:27M
11/01/19  MDU Resources Group, Inc.         10-Q        9/30/19  116:15M
 8/02/19  MDU Resources Group, Inc.         10-Q        6/30/19  118:14M
 5/08/19  MDU Resources Group, Inc.         8-K:5,9     5/07/19    3:123K
 2/22/19  MDU Resources Group, Inc.         10-K       12/31/18  158:25M
 2/15/19  MDU Resources Group, Inc.         8-K:5,9     2/14/19    2:1M
 9/21/17  MDU Resources Group, Inc.         8-K:5,9     9/15/17    3:283K
 8/04/17  MDU Resources Group, Inc.         10-Q        6/30/17   90:9.8M
 2/19/16  MDU Resources Group, Inc.         10-K       12/31/15  157:23M
 5/15/14  MDU Resources Group, Inc.         8-K:1,5,9   5/15/14    4:459K
 2/21/14  MDU Resources Group, Inc.         10-K       12/31/13  156:29M
 8/07/12  MDU Resources Group, Inc.         10-Q        6/30/12   70:10M
 8/05/11  MDU Resources Group, Inc.         10-Q        6/30/11   63:10M
 2/17/10  MDU Resources Group, Inc.         10-K       12/31/09   61:12M
 8/07/08  MDU Resources Group, Inc.         10-Q        6/15/08   10:2.6M
 1/21/04  MDU Resources Group, Inc.         S-8         1/21/04    7:911K                                   Dewey & Leboeuf LLP
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