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  <xs:element name="ReclassificationOfPreferredStockWarrants" id="tngn_ReclassificationOfPreferredStockWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="Issuanceofseriesredeemableconvertiblepreferredsharesvalue" id="tngn_Issuanceofseriesredeemableconvertiblepreferredsharesvalue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="IssuanceOfSeriesRedeemableConvertiblePreferredShares" id="tngn_IssuanceOfSeriesRedeemableConvertiblePreferredShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="RedeemableConvertiblePreferredStockValueIssuedForNotesPayable" id="tngn_RedeemableConvertiblePreferredStockValueIssuedForNotesPayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="RedeemableConvertiblePreferredStockSharesIssuedForNotesPayable" id="tngn_RedeemableConvertiblePreferredStockSharesIssuedForNotesPayable" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="ExtendedPeriodOfResearchAgreement" id="tngn_ExtendedPeriodOfResearchAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="StockIssuedDuringPeriodSharesRestrictedStockAwardNonemployeesValue" id="tngn_StockIssuedDuringPeriodSharesRestrictedStockAwardNonemployeesValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="StockIssuedDuringPeriodSharesRestrictedStockAwardNonemployeesShares" id="tngn_StockIssuedDuringPeriodSharesRestrictedStockAwardNonemployeesShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="IssuanceOfPreferredStockOptionsNoteholders" id="tngn_IssuanceOfPreferredStockOptionsNoteholders" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
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  <xs:element name="StockIssuedDuringPeriodSharesNewIssuesConsultants" id="tngn_StockIssuedDuringPeriodSharesNewIssuesConsultants" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
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  <xs:element name="IssuanceOfCommonStockToConvertibleNoteholdersInShares" id="tngn_IssuanceOfCommonStockToConvertibleNoteholdersInShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="IssuanceOfCommonStockOptionsConsultants" id="tngn_IssuanceOfCommonStockOptionsConsultants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
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  <xs:element name="ProceedsFromInitialPublicOfferingNetOfExpenses" id="tngn_ProceedsFromInitialPublicOfferingNetOfExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="ProceedsFromInitialPublicOfferingNetOfExpensesInShares" id="tngn_ProceedsFromInitialPublicOfferingNetOfExpensesInShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
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  <xs:element name="RestrictedCommonStockValuePerShare" id="tngn_RestrictedCommonStockValuePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="SeriesBRedeemableConvertiblePreferredStockValuePerShare" id="tngn_SeriesBRedeemableConvertiblePreferredStockValuePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="SeriesCRedeemableConvertiblePreferredStockValuePerShare" id="tngn_SeriesCRedeemableConvertiblePreferredStockValuePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="ChangeInValueOfLeaseLiability" id="tngn_ChangeInValueOfLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="NoncashInterestExpense" id="tngn_NoncashInterestExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="NoncashRentExpense" id="tngn_NoncashRentExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="ProceedsFromSaleOfCommonStockAndWarrantsNet" id="tngn_ProceedsFromSaleOfCommonStockAndWarrantsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="ManagementSPlansToContinueAsGoingConcernAbstract" id="tngn_ManagementSPlansToContinueAsGoingConcernAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ManagementSPlansToContinueAsGoingConcernTextBlock" id="tngn_ManagementSPlansToContinueAsGoingConcernTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
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  <xs:element name="ReductionInValueOfImpairedAssetsAcquired" id="tngn_ReductionInValueOfImpairedAssetsAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="PaymentOfSeveranceCosts" id="tngn_PaymentOfSeveranceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="RestructuringPlanMember" id="tngn_RestructuringPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="AccruedCompensationAndBenefitsLineItems" id="tngn_AccruedCompensationAndBenefitsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="AccruedCompensationAndBenefitsTable" id="tngn_AccruedCompensationAndBenefitsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LiabilityRecordedInConnectionWithSeveranceAgreement" id="tngn_LiabilityRecordedInConnectionWithSeveranceAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="EstimatedSeveranceCostsInNextSixMonths" id="tngn_EstimatedSeveranceCostsInNextSixMonths" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
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  <xs:element name="PreferredStockWarrantsMember" id="tngn_PreferredStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="VolatilityDaysAxis" id="tngn_VolatilityDaysAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="NumberOfMonthlyPaymentsOfPrincipalAndInterestForWhichEntityIsObligated" id="tngn_NumberOfMonthlyPaymentsOfPrincipalAndInterestForWhichEntityIsObligated" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="FairValueOfWarrantIssued" id="tngn_FairValueOfWarrantIssued" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="DebtInstrumentRepaymentPeriod" id="tngn_DebtInstrumentRepaymentPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="DeferredTaxAssetsCapitalizedStartUpCosts" id="tngn_DeferredTaxAssetsCapitalizedStartUpCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
  <xs:element name="CapitalizedStartUpCosts" id="tngn_CapitalizedStartUpCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" />
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  <xs:element name="NumberOfYearsForWhichLeaseIsToBeRenewed" id="tngn_NumberOfYearsForWhichLeaseIsToBeRenewed" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfDevelopmentMilestonesAchieved" id="tngn_NumberOfDevelopmentMilestonesAchieved" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfSubfieldsForSpecifiedAggregatePayments" id="tngn_NumberOfSubfieldsForSpecifiedAggregatePayments" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="AggregateMilestonesPaymentsToBePaidBasedOnCondition" id="tngn_AggregateMilestonesPaymentsToBePaidBasedOnCondition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="DocumentAndEntityInformationAbstract" id="tngn_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="NumberOfMonthlySeverancePaymentsToBeReceivedByEmployee" id="tngn_NumberOfMonthlySeverancePaymentsToBeReceivedByEmployee" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="EmployeeAndNonEmployeeDirectorMember" id="tngn_EmployeeAndNonEmployeeDirectorMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="AccruedResearchAndDevelopmentCurrent" id="tngn_AccruedResearchAndDevelopmentCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="SalesMilestonePaymentBasedOnSpecifiedCondition" id="tngn_SalesMilestonePaymentBasedOnSpecifiedCondition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" />
  <xs:element name="PurchasePricePerSecurity" id="tngn_PurchasePricePerSecurity" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="Short-TermInvestmentsPolicyTextBlock" id="tngn_Short-TermInvestmentsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="DeferredEquityOfferingCostsPolicyTextBlock" id="tngn_DeferredEquityOfferingCostsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="ReverseStockSplitPolicyTextBlock" id="tngn_ReverseStockSplitPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="SupplementalCashFlowDisclosuresAbstract" id="tngn_SupplementalCashFlowDisclosuresAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ConvertibleNoteIssuedToInitialStockholderForConsultingExpense" id="tngn_ConvertibleNoteIssuedToInitialStockholderForConsultingExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="FairValueOfWarrantsIssuedWithIssuanceOfLongTermDebt" id="tngn_FairValueOfWarrantsIssuedWithIssuanceOfLongTermDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="ReverseStockSplitAbstract" id="tngn_ReverseStockSplitAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
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  <xs:element name="IssuanceOfAdditionalWarrants" id="tngn_IssuanceOfAdditionalWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="ReclassificationOfWarrantLiabilityToStockholdersEquity" id="tngn_ReclassificationOfWarrantLiabilityToStockholdersEquity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="OfficeAndWarehouseEquipmentMember" id="tngn_OfficeAndWarehouseEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ScheduleOfAccruedCompensationAndBenefitsTableTextBlock" id="tngn_ScheduleOfAccruedCompensationAndBenefitsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="CreditRecognizedDueToDeclineInPerShareFairValue" id="tngn_CreditRecognizedDueToDeclineInPerShareFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="WarehouseSpaceMember" id="tngn_WarehouseSpaceMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="OfficeAndManufacturingSpaceMember" id="tngn_OfficeAndManufacturingSpaceMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LeaseTerm" id="tngn_LeaseTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="AdditionalChargesToOperations" id="tngn_AdditionalChargesToOperations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" />
  <xs:element name="InitialFairValue" id="tngn_InitialFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="EquipmentAndSupplementalWorkingCapitalNotesMember" id="tngn_EquipmentAndSupplementalWorkingCapitalNotesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="WorkingCapitalNoteMember" id="tngn_WorkingCapitalNoteMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="EquipmentNoteMember" id="tngn_EquipmentNoteMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="SupplementalWorkingCapitalNoteMember" id="tngn_SupplementalWorkingCapitalNoteMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="MachineryAndEquipmentLoanMember" id="tngn_MachineryAndEquipmentLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="PercentageOfPurchasePriceWhichEntityObligateToPayIfFailsToMeetLegalRequirementsRegardingRegistrationStatement" id="tngn_PercentageOfPurchasePriceWhichEntityObligateToPayIfFailsToMeetLegalRequirementsRegardingRegistrationStatement" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="Condition1Member" id="tngn_Condition1Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="PercentageOfPurchasePriceWhichEntityObligateToPayIfFailsToMeetLegalRequirementsRegardingCurrentPublicInformation" id="tngn_PercentageOfPurchasePriceWhichEntityObligateToPayIfFailsToMeetLegalRequirementsRegardingCurrentPublicInformation" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="StockIssuanceCosts" id="tngn_StockIssuanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" />
  <xs:element name="ScheduleOfFairValueAndNetCashSettlementValueValuationAssumptionsTableTextBlock" id="tngn_ScheduleOfFairValueAndNetCashSettlementValueValuationAssumptionsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="EquityClassifiedWarrantsMember" id="tngn_EquityClassifiedWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="LiabilityClassifiedWarrantsMember" id="tngn_LiabilityClassifiedWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ExpirationOfWarrantsAxis" id="tngn_ExpirationOfWarrantsAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="ExpirationOfWarrantsDomain" id="tngn_ExpirationOfWarrantsDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="WarrantsIssuedToVendorsExpiredFromSeptember2015ThroughDecember2016Member" id="tngn_WarrantsIssuedToVendorsExpiredFromSeptember2015ThroughDecember2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="WarrantsIssuedPursuantToMarch2011RefinancingOfWorkingCapitalNoteInMarch2016Member" id="tngn_WarrantsIssuedPursuantToMarch2011RefinancingOfWorkingCapitalNoteInMarch2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="WarrantsIssuedToLendersFromAugust2013ThroughDecember2016Member" id="tngn_WarrantsIssuedToLendersFromAugust2013ThroughDecember2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="WarrantsIssuedToLendersExpiredFromOctober2015ThroughSeptember2019Member" id="tngn_WarrantsIssuedToLendersExpiredFromOctober2015ThroughSeptember2019Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="WarrantsIssuedPursuantToMarch2011EquityFinancingInMarch2016Member" id="tngn_WarrantsIssuedPursuantToMarch2011EquityFinancingInMarch2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
  <xs:element name="WarrantsOutstandingAbstract" id="tngn_WarrantsOutstandingAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
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  <xs:element name="NetCashSettlementValueAssumptionsRiskFreeInterestRate" id="tngn_NetCashSettlementValueAssumptionsRiskFreeInterestRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
  <xs:element name="NetCashSettlementValueAssumptionsDividendYield" id="tngn_NetCashSettlementValueAssumptionsDividendYield" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="instant" />
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  <xs:element name="UseOfEstimatesTextBlock" id="tngn_UseOfEstimatesTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
  <xs:element name="NumberOfLevels" id="tngn_NumberOfLevels" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
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  <xs:element name="NumberOfDaysToDetermineAverageVolatilityThree" id="tngn_NumberOfDaysToDetermineAverageVolatilityThree" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" abstract="false" xbrli:periodType="duration" />
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  <xs:element name="TwoThousandTenStockIncentiveAndOptionPlanMember" id="tngn_TwoThousandTenStockIncentiveAndOptionPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" nillable="true" abstract="true" xbrli:periodType="duration" />
</xs:schema>
