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  <xs:element id="nxt_AccountsReceivableAndContractWithCustomerAssetsMember" abstract="true" name="AccountsReceivableAndContractWithCustomerAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="nxt_FurnitureFixturesComputerEquipmentAndSoftwareMember" abstract="true" name="FurnitureFixturesComputerEquipmentAndSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="nxt_AccruedFreightAndTariffs" abstract="false" name="AccruedFreightAndTariffs" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="nxt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTermAbstract" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
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  <xs:element id="nxt_IncrementalCommonSharesAttributableToDilutiveEffectOfNonControllingInterestsAndCommonStockEquivalentFromClassBCommonStock" abstract="false" name="IncrementalCommonSharesAttributableToDilutiveEffectOfNonControllingInterestsAndCommonStockEquivalentFromClassBCommonStock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="nxt_NewCreditAgreementMember" abstract="true" name="NewCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nxt_CreditFacilityMember" abstract="true" name="CreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nxt_LineOfCreditFacilityIncreasedMaximumBorrowingCapacity" abstract="false" name="LineOfCreditFacilityIncreasedMaximumBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_FairValueOfContingentConsiderationsForAcquisitions" abstract="false" name="FairValueOfContingentConsiderationsForAcquisitions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_NetAssetsLiabilitiesContributedToJointVenture" abstract="false" name="NetAssetsLiabilitiesContributedToJointVenture" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_TransfersFromPropertyAndEquipmentNetToInventories" abstract="false" name="TransfersFromPropertyAndEquipmentNetToInventories" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_TransfersFromOtherAssetsToOtherIntangibleAssetsNet" abstract="false" name="TransfersFromOtherAssetsToOtherIntangibleAssetsNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="nxt_EmployeeBenefitsAndShareBasedCompensationTaxBenefit" abstract="false" name="EmployeeBenefitsAndShareBasedCompensationTaxBenefit" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_NoncontrollingInterestUnpaidDistributionsToFormerNoncontrollingInterestHolders" abstract="false" name="NoncontrollingInterestUnpaidDistributionsToFormerNoncontrollingInterestHolders" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_IncomeTaxesCreditTransfer" abstract="false" name="IncomeTaxesCreditTransfer" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_NoncontrollingInterestProRataTaxDistributionToNoncontrollingInterestHolders" abstract="false" name="NoncontrollingInterestProRataTaxDistributionToNoncontrollingInterestHolders" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="nxt_CashDepositForNumberOfCSPVImports" abstract="false" name="CashDepositForNumberOfCSPVImports" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="nxt_FreightLaborAndOtherCostOfSales" abstract="false" name="FreightLaborAndOtherCostOfSales" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="nxt_OnSightMember" abstract="true" name="OnSightMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nxt_OrigamiSolarIncMember" abstract="true" name="OrigamiSolarIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="nxt_ZigorCorporationAndApexPowerMember" abstract="true" name="ZigorCorporationAndApexPowerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="nxt_BusinessCombinationDeferredContingentConsideration" abstract="false" name="BusinessCombinationDeferredContingentConsideration" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedLoanObligation" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetAcquiredAndLiabilityAssumedLoanObligation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_BusinessCombinationContingentConsiderationArrangementsTerm" abstract="false" name="BusinessCombinationContingentConsiderationArrangementsTerm" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="nxt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_BusinessCombinationContingentConsiderationRollForward" abstract="true" name="BusinessCombinationContingentConsiderationRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="nxt_BusinessCombinationContingentConsiderationArrangementsAdditionsLiability" abstract="false" name="BusinessCombinationContingentConsiderationArrangementsAdditionsLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="nxt_BusinessCombinationContingentConsiderationArrangementsPaymentLiability" abstract="false" name="BusinessCombinationContingentConsiderationArrangementsPaymentLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
