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| <import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/country/2016-01-31" schemaLocation="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/currency/2016-01-31" schemaLocation="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/exch/2016-01-31" schemaLocation="http://xbrl.sec.gov/exch/2016/exch-2016-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/naics/2011-01-31" schemaLocation="http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd"/> |
| <import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/> |
| <import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd"/> |
| <import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd"/> |
| <import namespace="http://xbrl.sec.gov/dei/2014-01-31" schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd"/> |
| <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/> |
| <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/> |
| <import namespace="http://fasb.org/us-types/2016-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2016/elts/us-types-2016-01-31.xsd"/> |
| <element name="DocumentAndEntityInformationAbstract" id="opvs_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConversionOptionDerivativeLiability" id="opvs_ConversionOptionDerivativeLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AdvancesFromRelatedParty" id="opvs_AdvancesFromRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PatentApplicationAndProsecutionFees" id="opvs_PatentApplicationAndProsecutionFees" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockReturnedAndCancelledForIssuanceOfConvertibleNote" id="opvs_StockReturnedAndCancelledForIssuanceOfConvertibleNote" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockReturnedAndCancelledSharesForIssuanceOfConvertibleNote" id="opvs_StockReturnedAndCancelledSharesForIssuanceOfConvertibleNote" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommonStockAndWarrantsIssuedForCash" id="opvs_CommonStockAndWarrantsIssuedForCash" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommonStockAndWarrantsIssuedForCashInShares" id="opvs_CommonStockAndWarrantsIssuedForCashInShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockIssuedDuringFairValueOfWarrantDerivativeLiability" id="opvs_StockIssuedDuringFairValueOfWarrantDerivativeLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RecognitionOfContingentBeneficialConversionFeatureAndWarrants" id="opvs_RecognitionOfContingentBeneficialConversionFeatureAndWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockIssuedDuringPeriodValueIssuedForwarrantExercise" id="opvs_StockIssuedDuringPeriodValueIssuedForwarrantExercise" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockIssuedDuringPeriodShareIssuedForwarrantExercise" id="opvs_StockIssuedDuringPeriodShareIssuedForwarrantExercise" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockCommonSharesValueIssuedRelatedToWarrantReset" id="opvs_StockCommonSharesValueIssuedRelatedToWarrantReset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockCommonSharesIssuedRelatedToWarrantReset" id="opvs_StockCommonSharesIssuedRelatedToWarrantReset" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockWarrantsReclassifiedAsDerivativeLiabilities" id="opvs_StockWarrantsReclassifiedAsDerivativeLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockWarrantsIssuedUponConversionOfDebt" id="opvs_StockWarrantsIssuedUponConversionOfDebt" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockConversionOfDebtToCommonStockAndWarrantsValue" id="opvs_StockConversionOfDebtToCommonStockAndWarrantsValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockConversionOfDebtToCommonStockAndWarrants" id="opvs_StockConversionOfDebtToCommonStockAndWarrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockOptionsIssuedForServices" id="opvs_StockOptionsIssuedForServices" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsIssuedForCompensation" id="opvs_WarrantsIssuedForCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OptionsIssuedAsCompensation" id="opvs_OptionsIssuedAsCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InterestExpenseOfWarrantsRelatedToConversionOfDebt" id="opvs_InterestExpenseOfWarrantsRelatedToConversionOfDebt" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InterestExpenseOfWarrantsIssued" id="opvs_InterestExpenseOfWarrantsIssued" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommonSharesIssuedForServices" id="opvs_CommonSharesIssuedForServices" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ProceedsFromIssuanceOfCommonStockAndWarrants" id="opvs_ProceedsFromIssuanceOfCommonStockAndWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AdvancesReceivedFromRelatedParty" id="opvs_AdvancesReceivedFromRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AdvancesRepaidToRelatedParty" id="opvs_AdvancesRepaidToRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtDiscountDueToWarrantsIssued" id="opvs_DebtDiscountDueToWarrantsIssued" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AccruedLiabilitiesSettledWithCommonSharesAndWarrants" id="opvs_AccruedLiabilitiesSettledWithCommonSharesAndWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ReclassificationOfConversionOptionsAsDerivativeLiabilities" id="opvs_ReclassificationOfConversionOptionsAsDerivativeLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ReclassificationOfWarrantsAsDerivativeLiabilities" id="opvs_ReclassificationOfWarrantsAsDerivativeLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConversionOfModifiedNote" id="opvs_ConversionOfModifiedNote" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AccruedInterestConvertedToDebt" id="opvs_AccruedInterestConvertedToDebt" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueOfCommonStockAndWarrantsIssuedForDebt" id="opvs_FairValueOfCommonStockAndWarrantsIssuedForDebt" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DiscountOnBeneficialConversionFeatureAndWarrantsIssuedWithDebt" id="opvs_DiscountOnBeneficialConversionFeatureAndWarrantsIssuedWithDebt" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsAndCommonSharesIssuedForAccruedInterest" id="opvs_WarrantsAndCommonSharesIssuedForAccruedInterest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommonStockReturnedAndCancelledForIssuanceOfConvertibleNotes" id="opvs_CommonStockReturnedAndCancelledForIssuanceOfConvertibleNotes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GoingConcernAbstract" id="opvs_GoingConcernAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GoingConcernTextBlock" id="opvs_GoingConcernTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueMember" id="opvs_FairValueMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ScheduleOfRoyaltyRevenuesTableTextBlock" id="opvs_ScheduleOfRoyaltyRevenuesTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ScheduleOfValuationOfDerivativeLiabilitiesAttachedToConvertibleDebtTableTextBlock" id="opvs_ScheduleOfValuationOfDerivativeLiabilitiesAttachedToConvertibleDebtTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AssetsCurrentFairValueDisclosure" id="opvs_AssetsCurrentFairValueDisclosure" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationAdditionsReclassifiedFromEquity" id="opvs_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationAdditionsReclassifiedFromEquity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationAdditionsRecognizedAsCompensationExpense" id="opvs_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationAdditionsRecognizedAsCompensationExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RoyaltyRevenueFutureMinimumPaymentsDueNextTwelveMonths" id="opvs_RoyaltyRevenueFutureMinimumPaymentsDueNextTwelveMonths" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RoyaltyRevenueFutureMinimumPaymentsDueInTwoYears" id="opvs_RoyaltyRevenueFutureMinimumPaymentsDueInTwoYears" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RoyaltyRevenueFutureMinimumPaymentsDueInThreeYears" id="opvs_RoyaltyRevenueFutureMinimumPaymentsDueInThreeYears" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RoyaltyRevenueFutureMinimumPaymentsDueInFourYears" id="opvs_RoyaltyRevenueFutureMinimumPaymentsDueInFourYears" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RoyaltyRevenueFutureMinimumPaymentsDueInFiveYears" id="opvs_RoyaltyRevenueFutureMinimumPaymentsDueInFiveYears" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RoyaltyRevenueFutureMinimumPaymentsDueThereafter" id="opvs_RoyaltyRevenueFutureMinimumPaymentsDueThereafter" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="BackgroundBasisOfPresentationTextualAbstract" id="opvs_BackgroundBasisOfPresentationTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LicenseAgreementDescription" id="opvs_LicenseAgreementDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CashPaidForResearchAndDevelopment" id="opvs_CashPaidForResearchAndDevelopment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SponsoredResearchAgreementDescription" id="opvs_SponsoredResearchAgreementDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WorkingCapitalDeficit" id="opvs_WorkingCapitalDeficit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GoingConcernTextualAbstract" id="opvs_GoingConcernTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OperationRequirementCostDescription" id="opvs_OperationRequirementCostDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SummaryOfSignificantAccountingPoliciesTextualAbstract" id="opvs_SummaryOfSignificantAccountingPoliciesTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationAdditionsRecognizedAsDebtDiscounts" id="opvs_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationAdditionsRecognizedAsDebtDiscounts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AdvancesRelatedPartyMember" id="opvs_AdvancesRelatedPartyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertibleNotesPayableRelatedPartyMember" id="opvs_ConvertibleNotesPayableRelatedPartyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertibleNotesPayableOneMember" id="opvs_ConvertibleNotesPayableOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertibleNotesPayableTwoMember" id="opvs_ConvertibleNotesPayableTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertibleNotesPayableThreeMember" id="opvs_ConvertibleNotesPayableThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertibleNotesPayableFourerMember" id="opvs_ConvertibleNotesPayableFourerMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertibleNotesPayableFiveMember" id="opvs_ConvertibleNotesPayableFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertibleNotesPayableSixMember" id="opvs_ConvertibleNotesPayableSixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertibleNotesPayableSevenMember" id="opvs_ConvertibleNotesPayableSevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertibleNotesPayableEightMember" id="opvs_ConvertibleNotesPayableEightMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DerivativeLiabilitiesAndConvertibleNotesMember" id="opvs_DerivativeLiabilitiesAndConvertibleNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ThirdPartyMember" id="opvs_ThirdPartyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NoteConversionAgreementMember" id="opvs_NoteConversionAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShortTermNoteAgreementsMember" id="opvs_ShortTermNoteAgreementsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtTextualAbstract" id="opvs_DebtTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtDiscount" id="opvs_DebtDiscount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TermOfWarrants" id="opvs_TermOfWarrants" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueOfTheConversionOptions" id="opvs_FairValueOfTheConversionOptions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AdditionalWarrantExpense" id="opvs_AdditionalWarrantExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueOfWarrantsIssuedWithDebt" id="opvs_FairValueOfWarrantsIssuedWithDebt" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AdditonalIssuanceOfWarrants" id="opvs_AdditonalIssuanceOfWarrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommonStockIssuedInConnectionWithDebt" id="opvs_CommonStockIssuedInConnectionWithDebt" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="UnamortizedDiscount" id="opvs_UnamortizedDiscount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsPurchasePrice" id="opvs_WarrantsPurchasePrice" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsExercisableTerm" id="opvs_WarrantsExercisableTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantAndCommonStockConversion" id="opvs_WarrantAndCommonStockConversion" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommonStockIssuedToPurchaseOfWarrants" id="opvs_CommonStockIssuedToPurchaseOfWarrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtDiscountDueToDerivativeLiabilities" id="opvs_DebtDiscountDueToDerivativeLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueOfConversionOptionDerivativeLiabilitiesGainLoss" id="opvs_FairValueOfConversionOptionDerivativeLiabilitiesGainLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FaiValueOfWarrantsIssued" id="opvs_FaiValueOfWarrantsIssued" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsIssuedToPurchaseCommonStock" id="opvs_WarrantsIssuedToPurchaseCommonStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeAbstract" id="opvs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualLifeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWarrantsIssuedRelatedToResetProvision" id="opvs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWarrantsIssuedRelatedToResetProvision" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsWarrantsIssuedRelatedToResetProvisionInWeightedAverageExercisePrice" id="opvs_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsWarrantsIssuedRelatedToResetProvisionInWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValuesAbstract" id="opvs_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingAggregateIntrinsicValuesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PipeThreeMember" id="opvs_PipeThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PipeOneMember" id="opvs_PipeOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PipeTwoMember" id="opvs_PipeTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TwoThousandAndThirteenStockOptionPlanMember" id="opvs_TwoThousandAndThirteenStockOptionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsOneMember" id="opvs_WarrantsOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsTwoMember" id="opvs_WarrantsTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsThreeMember" id="opvs_WarrantsThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ExercisePriceRangeOneMember" id="opvs_ExercisePriceRangeOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ExecutiveVicePresidentAndMemberBoardOfDirectorsMember" id="opvs_ExecutiveVicePresidentAndMemberBoardOfDirectorsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FirstAnniversaryMember" id="opvs_FirstAnniversaryMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SecondAnniversaryMember" id="opvs_SecondAnniversaryMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ThirdAnniversaryMember" id="opvs_ThirdAnniversaryMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EquityTextualAbstract" id="opvs_EquityTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ClassOfWarrantExercisablePeriod" id="opvs_ClassOfWarrantExercisablePeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockAndWarrantsIssuedDuringPeriodSharesCommonStockAndWarrants" id="opvs_StockAndWarrantsIssuedDuringPeriodSharesCommonStockAndWarrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommonStockEstimatedFairValueGrants" id="opvs_CommonStockEstimatedFairValueGrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsExerciseToSharesOfCommonStock" id="opvs_WarrantsExerciseToSharesOfCommonStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockIssuedDuringPeriodSharesExerciseOfWarrant" id="opvs_StockIssuedDuringPeriodSharesExerciseOfWarrant" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtConversionConvertedInstrumentAddItionalWarrantsIssued" id="opvs_DebtConversionConvertedInstrumentAddItionalWarrantsIssued" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OpvsWarrantsExercisePriceSubjectToCertainAntidilutionProvisions" id="opvs_OpvsWarrantsExercisePriceSubjectToCertainAntidilutionProvisions" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AdditionalWarrantsIssuedDuringPeriodForInvestors" id="opvs_AdditionalWarrantsIssuedDuringPeriodForInvestors" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NumberOfConvertibleDebtHolders" id="opvs_NumberOfConvertibleDebtHolders" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockIssuedDuringPeriodSharesIssuedForNonCashConsideration1" id="opvs_StockIssuedDuringPeriodSharesIssuedForNonCashConsideration1" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommonStockStrikePrice" id="opvs_CommonStockStrikePrice" type="us-types:perUnitItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueOfDerivativeLiabilityOfWarrants" id="opvs_FairValueOfDerivativeLiabilityOfWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantToPurchaseOfCommonStock" id="opvs_WarrantToPurchaseOfCommonStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueOfSharesAndWarrants" id="opvs_FairValueOfSharesAndWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockWarrantPlanExpense" id="opvs_StockWarrantPlanExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsValue" id="opvs_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncrementalCommonSharesAttributableToOptions" id="opvs_IncrementalCommonSharesAttributableToOptions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommitmentsAndContingenciesTextualAbstract" id="opvs_CommitmentsAndContingenciesTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LeaseAgreementTerm" id="opvs_LeaseAgreementTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncomeTaxesTextualAbstract" id="opvs_IncomeTaxesTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NotePurchaseAgreementMember" id="opvs_NotePurchaseAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OneYearPromissoryNoteMember" id="opvs_OneYearPromissoryNoteMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertiblePromissoryNoteMember" id="opvs_ConvertiblePromissoryNoteMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AmendmentAxis" id="opvs_AmendmentAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/> |
| <element name="AmendmentDomain" id="opvs_AmendmentDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AllenAmendmentMember" id="opvs_AllenAmendmentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EdgerAmendmentMember" id="opvs_EdgerAmendmentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TobinAmendmentMember" id="opvs_TobinAmendmentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SubsequentEventsTextualAbstract" id="opvs_SubsequentEventsTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AdditionalPromissoryNoteIssued" id="opvs_AdditionalPromissoryNoteIssued" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WarrantsIssuedInConnectionWithPromissoryNote" id="opvs_WarrantsIssuedInConnectionWithPromissoryNote" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InvestmentInPrivatePlacementOfConvertibleNotesAndWarrants" id="opvs_InvestmentInPrivatePlacementOfConvertibleNotesAndWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PurchaseOfCommonStockByConvertibleNoteAndWarrant" id="opvs_PurchaseOfCommonStockByConvertibleNoteAndWarrant" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SettlementForEmployeeTermination" id="opvs_SettlementForEmployeeTermination" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PaymentsToAcquirePromissoryNote" id="opvs_PaymentsToAcquirePromissoryNote" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IssuanceOfWarrants" id="opvs_IssuanceOfWarrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockOptionExpirationTerm" id="opvs_StockOptionExpirationTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CashCompensation" id="opvs_CashCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| </schema> |