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  <xsd:element id="fcel_FinanceObligationsForSaleLeaseBackTransactionsMember" name="FinanceObligationsForSaleLeaseBackTransactionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fcel_StateOfConnecticutMember" name="StateOfConnecticutMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fcel_FifthThirdBankTermLoanAgreementMember" name="FifthThirdBankTermLoanAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fcel_TwoThousandEighteenOmnibusIncentivePlanMember" name="TwoThousandEighteenOmnibusIncentivePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fcel_TimeBasedAwardsMember" name="TimeBasedAwardsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fcel_CommitmentsAndContingenciesLineItems" name="CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fcel_CommitmentsAndContingenciesTable" name="CommitmentsAndContingenciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fcel_PercentageOfSalesCommission" name="PercentageOfSalesCommission" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="fcel_AverageSaleOfStockPricePerShare" name="AverageSaleOfStockPricePerShare" nillable="true" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" abstract="false" />
  <xsd:element id="fcel_GrossProceedsFromIssuanceOfCommonStock" name="GrossProceedsFromIssuanceOfCommonStock" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="fcel_TaxEquityFinancingTransactionWithEastWestBankFor7.4MwFuelCellProjectMember" name="TaxEquityFinancingTransactionWithEastWestBankFor7.4MwFuelCellProjectMember" nillable="true" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" />
  <xsd:element id="fcel_CapacityOfPlant" name="CapacityOfPlant" nillable="true" type="dtr-types:powerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element id="fcel_TaxEquityFinancingCommitment" name="TaxEquityFinancingCommitment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="fcel_InitialDrawFromTaxEquityFinancingCommitment" name="InitialDrawFromTaxEquityFinancingCommitment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" />
  <xsd:element id="fcel_ClosingCostsRelatedToTaxEquityFinancingCommitment" name="ClosingCostsRelatedToTaxEquityFinancingCommitment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" />
  <xsd:element id="fcel_RemainingAmountOfDrawFromTaxEquityFinancingCommitment" name="RemainingAmountOfDrawFromTaxEquityFinancingCommitment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" />
  <xsd:element id="fcel_PercentageOfCashAndTaxAllocationsToBeReceived" name="PercentageOfCashAndTaxAllocationsToBeReceived" nillable="true" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" />
  <xsd:element name="AgreementTypeAxis" id="fcel_AgreementTypeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AgreementTypeDomain" id="fcel_AgreementTypeDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ImpairmentOfPropertyPlantAndEquipmentAndProjectAssets" id="fcel_ImpairmentOfPropertyPlantAndEquipmentAndProjectAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ProjectAssetsBopAndSiteConstructionMember" id="fcel_ProjectAssetsBopAndSiteConstructionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ProjectAssetsModulesMember" id="fcel_ProjectAssetsModulesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ProceedsFromIssuanceOfCommonStockIssuedForStockPlansAndRelatedExpenses" id="fcel_ProceedsFromIssuanceOfCommonStockIssuedForStockPlansAndRelatedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="GrotonProjectMember" id="fcel_GrotonProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LIPYaphankSolidWasteManagementProjectMember" id="fcel_LIPYaphankSolidWasteManagementProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ConnecticutGreenBankLoansMember" id="fcel_ConnecticutGreenBankLoansMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="EmploymentObligationMember" id="fcel_EmploymentObligationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="EmployeeStockPurchasePlanMember" id="fcel_EmployeeStockPurchasePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DebtServiceCoverageRatio" id="fcel_DebtServiceCoverageRatio" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NumberOfMinimumFullTimePositionsRequiredToBeMaintain" id="fcel_NumberOfMinimumFullTimePositionsRequiredToBeMaintain" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ConsecutiveTermForFullTimePositions" id="fcel_ConsecutiveTermForFullTimePositions" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="AdditionalCreditsToBeEarnedUnderAssistanceAgreement" id="fcel_AdditionalCreditsToBeEarnedUnderAssistanceAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PrincipalPayableNumberOfEmployeeUnderEmployeeObligationTarget" id="fcel_PrincipalPayableNumberOfEmployeeUnderEmployeeObligationTarget" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="TaxEquityFinancingAbstract" id="fcel_TaxEquityFinancingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TaxEquityFinancingDisclosureTextBlock" id="fcel_TaxEquityFinancingDisclosureTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PowerPurchaseAgreementMember" id="fcel_PowerPurchaseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NumberOfProjectUnderPowerPurchaseAgreement" id="fcel_NumberOfProjectUnderPowerPurchaseAgreement" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="BridgeportMember" id="fcel_BridgeportMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TulareBiomartProjectMember" id="fcel_TulareBiomartProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LongIslandPowerAuthorityProjectMember" id="fcel_LongIslandPowerAuthorityProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PowerCapacityOfOperatingProject" id="fcel_PowerCapacityOfOperatingProject" type="dtr-types:powerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PowerPlantUnderConstruction" id="fcel_PowerPlantUnderConstruction" type="dtr-types:powerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="TermForProcuringFuelUnderPowerPurchaseAgreement" id="fcel_TermForProcuringFuelUnderPowerPurchaseAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ToyotaMember" id="fcel_ToyotaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PowerCapacityUnderConstructionPhase" id="fcel_PowerCapacityUnderConstructionPhase" type="dtr-types:powerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ToyotaProjectMember" id="fcel_ToyotaProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LongTermProjectAssetsNetExcludingConstructionInProgress" id="fcel_LongTermProjectAssetsNetExcludingConstructionInProgress" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PoscoEnergySettlementAgreementMember" id="fcel_PoscoEnergySettlementAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PercentageOfAmountPayableEquivalentToCapitalContributionsAfterOptionExercise" id="fcel_PercentageOfAmountPayableEquivalentToCapitalContributionsAfterOptionExercise" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="TaxEquityFinancingTransactionWithReiFor7.4MwFuelCellProjectMember" id="fcel_TaxEquityFinancingTransactionWithReiFor7.4MwFuelCellProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SettlementAgreementOptionToPurchaseAdditionalWarrantyModuleUnits" id="fcel_SettlementAgreementOptionToPurchaseAdditionalWarrantyModuleUnits" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="SettlementAgreementModulesUnitsOrderPlaced" id="fcel_SettlementAgreementModulesUnitsOrderPlaced" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="MilestoneBasedPayments" id="fcel_MilestoneBasedPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="EmreJointDevelopmentAgreementMember" id="fcel_EmreJointDevelopmentAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TaxEquityFinancingCommitmentAmountOfRefund" id="fcel_TaxEquityFinancingCommitmentAmountOfRefund" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="TaxEquityFinancingCommitmentAmountOfDistribution" id="fcel_TaxEquityFinancingCommitmentAmountOfDistribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ResearchAndDevelopmentArrangementAmountOfReimbursement" id="fcel_ResearchAndDevelopmentArrangementAmountOfReimbursement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="NetNonCashReclassificationsOfOtherAssetsToProjectAssets" id="fcel_NetNonCashReclassificationsOfOtherAssetsToProjectAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DerbyProject14.0MegaWattMember" id="fcel_DerbyProject14.0MegaWattMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DerbyProject2.8MegaWattMember" id="fcel_DerbyProject2.8MegaWattMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NoncontrollingInterestIncreaseFromReclassification" id="fcel_NoncontrollingInterestIncreaseFromReclassification" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="AggregateSharesForOffer" id="fcel_AggregateSharesForOffer" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="CommonStockRemainingSharesAvailableForIssuance" id="fcel_CommonStockRemainingSharesAvailableForIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="TaxEquityFinancingCommitmentContributions" id="fcel_TaxEquityFinancingCommitmentContributions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="FirstAnniversaryOfProjectAchievingCommercialOperationsMember" id="fcel_FirstAnniversaryOfProjectAchievingCommercialOperationsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SecondAnniversaryOfProjectAchievingCommercialOperationsMember" id="fcel_SecondAnniversaryOfProjectAchievingCommercialOperationsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ThirdAnniversaryOfProjectAchievingCommercialOperationsMember" id="fcel_ThirdAnniversaryOfProjectAchievingCommercialOperationsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TaxEquityFinancingAggregateFee" id="fcel_TaxEquityFinancingAggregateFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="TaxEquityFinancingWithdrawalRightPercentOfReturnOfInvestment" id="fcel_TaxEquityFinancingWithdrawalRightPercentOfReturnOfInvestment" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NetNoncashReclassificationsOfFixedAssetsToInventory" id="fcel_NetNoncashReclassificationsOfFixedAssetsToInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="TwoZeroTwoTwoOpenMarketSaleAgreementMember" id="fcel_TwoZeroTwoTwoOpenMarketSaleAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="JefferiesLlcB.rileySecuritiesBarclaysCapitalIncBmocorpBofaSecuritiesCanacordGenuityLlcCitigroupGlobalMarketsIncJ.p.morganSecuritiesLlcAndLoopCapitalMarketsLlcMember" id="fcel_JefferiesLlcB.rileySecuritiesBarclaysCapitalIncBmocorpBofaSecuritiesCanacordGenuityLlcCitigroupGlobalMarketsIncJ.p.morganSecuritiesLlcAndLoopCapitalMarketsLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RelativeTotalShareholderReturnPerformanceSharesMember" id="fcel_RelativeTotalShareholderReturnPerformanceSharesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ShareBasedCompensationArrangementAwardCalibrationPercentage" id="fcel_ShareBasedCompensationArrangementAwardCalibrationPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ShareBasedCompensationArrangementVarianceFromAwardCalibrationPercentage" id="fcel_ShareBasedCompensationArrangementVarianceFromAwardCalibrationPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ShareBasedCompensationArrangementAwardCapPercent" id="fcel_ShareBasedCompensationArrangementAwardCapPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ShareBasedCompensationArrangementAwardAdditionalCapPercent" id="fcel_ShareBasedCompensationArrangementAwardAdditionalCapPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ShareBasedCompensationArrangementThresholdConsecutiveTradingDays" id="fcel_ShareBasedCompensationArrangementThresholdConsecutiveTradingDays" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="SeniorManagementMember" id="fcel_SeniorManagementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SalariedEmployeesMember" id="fcel_SalariedEmployeesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PercentageOfTargetPerformance" id="fcel_PercentageOfTargetPerformance" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="CommonStockCapitalSharesReservedForFutureIssuancePercent" id="fcel_CommonStockCapitalSharesReservedForFutureIssuancePercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="PerformanceAndTimeBasedUnitsMember" id="fcel_PerformanceAndTimeBasedUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ShareBasedCompensationNumberOfAwardComponents" id="fcel_ShareBasedCompensationNumberOfAwardComponents" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="TaxEquityFinancingFeesForExtensionOfCommercialOperationDeadline" id="fcel_TaxEquityFinancingFeesForExtensionOfCommercialOperationDeadline" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ConsecutiveTermForAverageNumberOfEmployees" id="fcel_ConsecutiveTermForAverageNumberOfEmployees" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="CapacityOfPlantDueToTechnicalImprovementPlan" id="fcel_CapacityOfPlantDueToTechnicalImprovementPlan" type="dtr-types:powerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PaymentOfElectricEnergyAmendmentFee" id="fcel_PaymentOfElectricEnergyAmendmentFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="AmendedAndRestatedPowerPurchaseAgreementMember" id="fcel_AmendedAndRestatedPowerPurchaseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LongTermIncentivePlanFiscal2023Member" id="fcel_LongTermIncentivePlanFiscal2023Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="VersaPowerSystemsLtdMember" id="fcel_VersaPowerSystemsLtdMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AreaOfAdditionalLeasedSpace" id="fcel_AreaOfAdditionalLeasedSpace" type="dtr-types:areaItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DerbyProjectMember" id="fcel_DerbyProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="FuelSupplyContractTerm" id="fcel_FuelSupplyContractTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DevelopmentAgreementFirstTechnicalMilestonePaymentReceived" id="fcel_DevelopmentAgreementFirstTechnicalMilestonePaymentReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="RotterdamProjectMember" id="fcel_RotterdamProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DevelopmentAgreementRemainingAmountAvailableDiscountPurchaseOfFuelCellModuleAndDetailedEngineeringDesign" id="fcel_DevelopmentAgreementRemainingAmountAvailableDiscountPurchaseOfFuelCellModuleAndDetailedEngineeringDesign" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="NonRecourseProjectFinancingFacilityMember" id="fcel_NonRecourseProjectFinancingFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TermLoanMember" id="fcel_TermLoanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="UnrestrictedCash" id="fcel_UnrestrictedCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PercentageOfElectricityOutputProvidedToCustomers" id="fcel_PercentageOfElectricityOutputProvidedToCustomers" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PfizerProjectMember" id="fcel_PfizerProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RiversideRegionalWaterQualityControlPlantProjectMember" id="fcel_RiversideRegionalWaterQualityControlPlantProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SantaRitaJailProjectMember" id="fcel_SantaRitaJailProjectMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PncEnergyCapitalLlcMember" id="fcel_PncEnergyCapitalLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SaleLeasebackArrangementsWithPncMember" id="fcel_SaleLeasebackArrangementsWithPncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LibertyBankFifthThirdBankAndConnecticutGreenBankMember" id="fcel_LibertyBankFifthThirdBankAndConnecticutGreenBankMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LibertyBankAndFifthThirdBankMember" id="fcel_LibertyBankAndFifthThirdBankMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ScenarioFirstFourYearsMember" id="fcel_ScenarioFirstFourYearsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ScenarioAfterFourYearsMember" id="fcel_ScenarioAfterFourYearsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ApplicableInterestPeriodOneMember" id="fcel_ApplicableInterestPeriodOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ApplicableInterestPeriodTwoMember" id="fcel_ApplicableInterestPeriodTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ApplicableInterestPeriodThreeMember" id="fcel_ApplicableInterestPeriodThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DebtInstrumentCollateralNumberOfOperatingFuelCellGenerationProjects" id="fcel_DebtInstrumentCollateralNumberOfOperatingFuelCellGenerationProjects" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="SaleLeasebackTransactionLeaseBuyoutAmount" id="fcel_SaleLeasebackTransactionLeaseBuyoutAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="FundsReleasedFromRestrictedAndUnrestrictedReserveAccount" id="fcel_FundsReleasedFromRestrictedAndUnrestrictedReserveAccount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="NumberOfLeasedProjectsOwnershipReacquired" id="fcel_NumberOfLeasedProjectsOwnershipReacquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ProceedsFromLongTermDebtGross" id="fcel_ProceedsFromLongTermDebtGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="PaymentsForLeaseBuyoutAmountsAndSalesTaxes" id="fcel_PaymentsForLeaseBuyoutAmountsAndSalesTaxes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PaymentsToFundCapitalExpenditureReserveAccount" id="fcel_PaymentsToFundCapitalExpenditureReserveAccount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ProceedsFromDebtDistributedToCompany" id="fcel_ProceedsFromDebtDistributedToCompany" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="FundsReleasedFromRestrictedCash" id="fcel_FundsReleasedFromRestrictedCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DebtInstrumentInitialInterestPeriod" id="fcel_DebtInstrumentInitialInterestPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentInterestPeriod" id="fcel_DebtInstrumentInterestPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentPrincipalAmortizationPeriod" id="fcel_DebtInstrumentPrincipalAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuableOnExerciseOfStockOptions" id="fcel_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuableOnExerciseOfStockOptions" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPurchaseByIndividualParticipant" id="fcel_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesPurchaseByIndividualParticipant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ThirdAmendmentMember" id="fcel_ThirdAmendmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NumberOfMinimumFullTimePositionsRequiredToBeMaintainedIncludingAdditionalEmploymentPositions" id="fcel_NumberOfMinimumFullTimePositionsRequiredToBeMaintainedIncludingAdditionalEmploymentPositions" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="CapitalExpenditureReserve" id="fcel_CapitalExpenditureReserve" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DebtServiceCoverageRatioTerm" id="fcel_DebtServiceCoverageRatioTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="CapitalExpenditureReserveFundedOutOfDebt" id="fcel_CapitalExpenditureReserveFundedOutOfDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ExtensionTermOfGasAgreement" id="fcel_ExtensionTermOfGasAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ThresholdAnnualOperatingExpenseBudgetAsPercentOfBaseCaseModelApprovalFromLenders" id="fcel_ThresholdAnnualOperatingExpenseBudgetAsPercentOfBaseCaseModelApprovalFromLenders" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="AnnualOperatingExpenseBudgetApprovalFromLendersLendingPercent" id="fcel_AnnualOperatingExpenseBudgetApprovalFromLendersLendingPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentTrailingPeriodForDebtServiceCoverageRatio" id="fcel_DebtInstrumentTrailingPeriodForDebtServiceCoverageRatio" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtServiceCoverageRatioTestingFrequency" id="fcel_DebtServiceCoverageRatioTestingFrequency" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PeriodToExerciseOptionToPurchaseMemberInterestInTaxEquityPartnership" id="fcel_PeriodToExerciseOptionToPurchaseMemberInterestInTaxEquityPartnership" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="OpcoFinancingFacilityMember" id="fcel_OpcoFinancingFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="GainOnFairValueAdjustmentOfDebt" id="fcel_GainOnFairValueAdjustmentOfDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DebtServiceAndPerformanceReservesRelatedToFinancingFacility" id="fcel_DebtServiceAndPerformanceReservesRelatedToFinancingFacility" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="NetProceedsFromIssuanceOfLineOfCredit" id="fcel_NetProceedsFromIssuanceOfLineOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="RepaymentOfAdditionalLinesOfCredit" id="fcel_RepaymentOfAdditionalLinesOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="GrotonBackLeverageFinancingMember" id="fcel_GrotonBackLeverageFinancingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="LibertyLenderMember" id="fcel_LibertyLenderMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AmalgamatedLenderMember" id="fcel_AmalgamatedLenderMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="BackLeverageLendersMember" id="fcel_BackLeverageLendersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SeniorBackLeverageLendersMember" id="fcel_SeniorBackLeverageLendersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SubordinatedBackLeverageLendersMember" id="fcel_SubordinatedBackLeverageLendersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SeniorBackAndSubordinateBackLeverageLoanFacilityMember" id="fcel_SeniorBackAndSubordinateBackLeverageLoanFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SeniorBackLeverageLoanFacilityMember" id="fcel_SeniorBackLeverageLoanFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SubordinatedBackLeverageLoanFacilityMember" id="fcel_SubordinatedBackLeverageLoanFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CarbonOffsetEventContinuingMember" id="fcel_CarbonOffsetEventContinuingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CarbonOffsetEventNonContinuingMember" id="fcel_CarbonOffsetEventNonContinuingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="StepDownDateMember" id="fcel_StepDownDateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="AfterStepDownDateMember" id="fcel_AfterStepDownDateMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PercentageOfLoanProvidedByLender" id="fcel_PercentageOfLoanProvidedByLender" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PaymentToFundDebtServiceReserveAccounts" id="fcel_PaymentToFundDebtServiceReserveAccounts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PaymentToFundOperationsAndMaintenanceAndModuleReplacementReserveAccounts" id="fcel_PaymentToFundOperationsAndMaintenanceAndModuleReplacementReserveAccounts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="OutputShortfallPayments" id="fcel_OutputShortfallPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DebtInstrumentFloorRate" id="fcel_DebtInstrumentFloorRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PercentageOfExcessCashflowAvailableToBorrower" id="fcel_PercentageOfExcessCashflowAvailableToBorrower" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="TermFollowingCommercialOperationDateAndTerminationOfAmendedAndRestatedPpa" id="fcel_TermFollowingCommercialOperationDateAndTerminationOfAmendedAndRestatedPpa" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentTermOfInterestOnlyPeriodAfterClosingDate" id="fcel_DebtInstrumentTermOfInterestOnlyPeriodAfterClosingDate" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentBasisPoints" id="fcel_DebtInstrumentBasisPoints" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="StockIssuedDuringPeriodSharesSold" id="fcel_StockIssuedDuringPeriodSharesSold" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentAnnualCarbonEmissionPriceMultiplier" id="fcel_DebtInstrumentAnnualCarbonEmissionPriceMultiplier" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentTermToAcquireInterestOnFlipPoint" id="fcel_DebtInstrumentTermToAcquireInterestOnFlipPoint" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="DebtInstrumentPrepaymentFeePercentage" id="fcel_DebtInstrumentPrepaymentFeePercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PrepaymentOnOrPriorToSecondAnniversaryMember" id="fcel_PrepaymentOnOrPriorToSecondAnniversaryMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PrepaymentAfterSecondAnniversaryOfClosingDateButOnOrPriorToFourthAnniversaryMember" id="fcel_PrepaymentAfterSecondAnniversaryOfClosingDateButOnOrPriorToFourthAnniversaryMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PrepaymentAfterFourthAnniversaryOfClosingDateButOnOrPriorToSeventhAnniversaryMember" id="fcel_PrepaymentAfterFourthAnniversaryOfClosingDateButOnOrPriorToSeventhAnniversaryMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SettledAfterPeriodEndMember" id="fcel_SettledAfterPeriodEndMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
</xsd:schema>
