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        <link:definition>9955526 - Disclosure - VARIABLE INTEREST ENTITES (Tables)</link:definition>
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  <xs:element id="ogs_ForwardContractIndexedToAtTheMarketEquitySettlementOriginalNumberOfShares" abstract="false" name="ForwardContractIndexedToAtTheMarketEquitySettlementOriginalNumberOfShares" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="ogs_ForwardContractIndexedToIssuersAtTheMarketEquityForwardRatePerShare" abstract="false" name="ForwardContractIndexedToIssuersAtTheMarketEquityForwardRatePerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="ogs_ForwardContractIndexedToAtTheMarketEquitySettlementCashAmount" abstract="false" name="ForwardContractIndexedToAtTheMarketEquitySettlementCashAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_ForwardContractIndexedToAtTheMarketEquitySettlementNumberOfShares" abstract="false" name="ForwardContractIndexedToAtTheMarketEquitySettlementNumberOfShares" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="ogs_DefinedBenefitPlanReclassificationAdjustmentBeforeTaxAndRegulatoryAdjustments" abstract="false" name="DefinedBenefitPlanReclassificationAdjustmentBeforeTaxAndRegulatoryAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DefinedBenefitPlanRegulatoryAdjustments" abstract="false" name="DefinedBenefitPlanRegulatoryAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_ForfeitureRateMaximumInHundredths" abstract="false" name="ForfeitureRateMaximumInHundredths" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ogs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesGranted" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesGranted" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesVested" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFairValueOfSharesVested" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_MaximumAllowablePercentageOfAnnualBasePayWithheldToPurchaseOurCommonStock" abstract="false" name="MaximumAllowablePercentageOfAnnualBasePayWithheldToPurchaseOurCommonStock" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ogs_PurchasePricePercentageOfLowerOFItsGrantDateOrExerciseDateMarketPriceInHundredths" abstract="false" name="PurchasePricePercentageOfLowerOFItsGrantDateOrExerciseDateMarketPriceInHundredths" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ogs_PercentOfEmployeesWhoParticipatedInTheEmployeeStockPurchasePlan" abstract="false" name="PercentOfEmployeesWhoParticipatedInTheEmployeeStockPurchasePlan" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ogs_SharesSoldUnderEmployeeStockPurchasePlan" abstract="false" name="SharesSoldUnderEmployeeStockPurchasePlan" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="ogs_SharePriceOfSharesSoldUnderEmployeeStockPurchasePlanInDollarsPerShare" abstract="false" name="SharePriceOfSharesSoldUnderEmployeeStockPurchasePlanInDollarsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="ogs_A401kPlanMember" abstract="true" name="A401kPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_InvestmentGradeBondsMember" abstract="true" name="InvestmentGradeBondsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_USLargeCapEquityMember" abstract="true" name="USLargeCapEquityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_AlternativeInvestmentsMember" abstract="true" name="AlternativeInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_DevelopedForeignEquitiesMember" abstract="true" name="DevelopedForeignEquitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_MidCapEquitiesMember" abstract="true" name="MidCapEquitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_EmergingMarketEquitiesMember" abstract="true" name="EmergingMarketEquitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_SmallCapEquitiesMember" abstract="true" name="SmallCapEquitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_GovernmentObligationsMember" abstract="true" name="GovernmentObligationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_CorporateObligationsMember" abstract="true" name="CorporateObligationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_CashAndMoneyMarketFundsMember" abstract="true" name="CashAndMoneyMarketFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_InsuranceContractsAndGroupAnnuityContractsMember" abstract="true" name="InsuranceContractsAndGroupAnnuityContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_InvestmentsAtFairValueHierarchyTotalMember" abstract="true" name="InvestmentsAtFairValueHierarchyTotalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_AccruedInterestMember" abstract="true" name="AccruedInterestMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_GrosvenorRegisteredMultiLimitedPartnershipMember" abstract="true" name="GrosvenorRegisteredMultiLimitedPartnershipMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_K2InstitutionalInvestorsIILimitedPartnershipMember" abstract="true" name="K2InstitutionalInvestorsIILimitedPartnershipMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_NonserviceCostsMember" abstract="true" name="NonserviceCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_Minimumnumberofyearsofserviceforcertainemployeestobeeligibletoparticipateinsharedwelfareplansthatprovidepostretirementmedicalandlifeinsurancebenefits" abstract="false" name="Minimumnumberofyearsofserviceforcertainemployeestobeeligibletoparticipateinsharedwelfareplansthatprovidepostretirementmedicalandlifeinsurancebenefits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="ogs_DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMinimum" abstract="false" name="DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMinimum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ogs_DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMaximum" abstract="false" name="DefinedBenefitPlanAssumptionsUsedToDetermineBenefitObligationsRateofCompensationIncreaseMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ogs_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ogs_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ogs_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossBeforeRegulatoryAssetsAndTaxes" abstract="false" name="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossBeforeRegulatoryAssetsAndTaxes" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_OtherPostretirementBenefitsPlanAssetsTargetAllocationPercentage" abstract="false" name="OtherPostretirementBenefitsPlanAssetsTargetAllocationPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ogs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncrease" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncrease" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodDecrease" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetExpense" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DefinedBenefitPlanBenefitsPaid" abstract="false" name="DefinedBenefitPlanBenefitsPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_RegulatoryDeferralOfNetPeriodicBenefitCosts" abstract="false" name="RegulatoryDeferralOfNetPeriodicBenefitCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_CapitalizedNonServiceCostComponents" abstract="false" name="CapitalizedNonServiceCostComponents" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_RequestedRefundFrom2022AmendedFederalTaxReturn" abstract="false" name="RequestedRefundFrom2022AmendedFederalTaxReturn" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_RefundFromAmendedOklahomaCorporateIncomeTaxReturn" abstract="false" name="RefundFromAmendedOklahomaCorporateIncomeTaxReturn" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_ReductioninincometaxexpensefortheamortizationoftheregulatoryliabilityassociatedwithexcessADITthatwasreturnedtocustomers" abstract="false" name="ReductioninincometaxexpensefortheamortizationoftheregulatoryliabilityassociatedwithexcessADITthatwasreturnedtocustomers" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_TaxEffectOfPermanentDifferences" abstract="false" name="TaxEffectOfPermanentDifferences" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_TaxEffectOfPermanentDifferencesEffectiveIncomeTaxRateReconciliationPercent" abstract="false" name="TaxEffectOfPermanentDifferencesEffectiveIncomeTaxRateReconciliationPercent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_TaxEffectOfStateIncomeTaxDeduction" abstract="false" name="TaxEffectOfStateIncomeTaxDeduction" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_TaxEffectOfStateIncomeTaxDeductionEffectiveIncomeTaxRateReconciliationPercent" abstract="false" name="TaxEffectOfStateIncomeTaxDeductionEffectiveIncomeTaxRateReconciliationPercent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_AmortizationOfEDITRegulatoryLiabilityFederalTax" abstract="false" name="AmortizationOfEDITRegulatoryLiabilityFederalTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_AmortizationOfEDITRegulatoryLiabilityPercent" abstract="false" name="AmortizationOfEDITRegulatoryLiabilityPercent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_AmortizationOfEDITRegulatoryLiabilityStateTax" abstract="false" name="AmortizationOfEDITRegulatoryLiabilityStateTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_AmortizationOfEDITRegulatoryLiabilityStateTaxEffectiveIncomeTaxRateReconciliationPercent" abstract="false" name="AmortizationOfEDITRegulatoryLiabilityStateTaxEffectiveIncomeTaxRateReconciliationPercent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DeferredTaxAssetsRegulatoryAdjustments" abstract="false" name="DeferredTaxAssetsRegulatoryAdjustments" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DeferredTaxAssetsLeasingArrangements" abstract="false" name="DeferredTaxAssetsLeasingArrangements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DeferredTaxAssetsRegulatoryAssetsPurchasedGasCostAdjustment" abstract="false" name="DeferredTaxAssetsRegulatoryAssetsPurchasedGasCostAdjustment" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilitiesWinterWeatherEventCosts" abstract="false" name="DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilitiesWinterWeatherEventCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DeferredTaxLiabilitiesRegulatoryLiabilitiesPurchasedGasCostAdjustment" abstract="false" name="DeferredTaxLiabilitiesRegulatoryLiabilitiesPurchasedGasCostAdjustment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilitiesOther" abstract="false" name="DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilitiesOther" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefits" abstract="false" name="DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_IRS2022IncomeTaxReturnFederalIncomeTax" abstract="false" name="IRS2022IncomeTaxReturnFederalIncomeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_IRS2022IncomeTaxReturnInterest" abstract="false" name="IRS2022IncomeTaxReturnInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_IRS2022FederalIncomeTaxReturn" abstract="false" name="IRS2022FederalIncomeTaxReturn" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_OTHERINCOMEANDOTHEREXPENSEAxis" abstract="true" name="OTHERINCOMEANDOTHEREXPENSEAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="ogs_OTHERINCOMEANDOTHEREXPENSEDomain" abstract="true" name="OTHERINCOMEANDOTHEREXPENSEDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_NetPeriodicCreditCostOtherThanServiceCostMember" abstract="true" name="NetPeriodicCreditCostOtherThanServiceCostMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_GainLossOnInvestmentsAssociatedWithNonqualifiedDeferredCompensationPlansMember" abstract="true" name="GainLossOnInvestmentsAssociatedWithNonqualifiedDeferredCompensationPlansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_UnrealizedGainLossOnMarketableEquitySecuritiesMember" abstract="true" name="UnrealizedGainLossOnMarketableEquitySecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_OthernetMember" abstract="true" name="OthernetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ogs_NumberOfFormerManufacturedGasSitesWhereWeOwnOrRetainLegalResponsibilityForEnvironmentalConditions" abstract="false" name="NumberOfFormerManufacturedGasSitesWhereWeOwnOrRetainLegalResponsibilityForEnvironmentalConditions" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ogs_Numberofsiteswithongoinggroundwatermonitoring" abstract="false" name="Numberofsiteswithongoinggroundwatermonitoring" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ogs_NumberOfSitesWhereRegulatoryClosureHasBeenAchieved" abstract="false" name="NumberOfSitesWhereRegulatoryClosureHasBeenAchieved" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="ogs_DeferredMGPCostsMaximum" abstract="false" name="DeferredMGPCostsMaximum" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_RegulatoryAssetForCostsAssociatedWithManufacturedGasSites" abstract="false" name="RegulatoryAssetForCostsAssociatedWithManufacturedGasSites" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_Premiumsrecordedinothercurrentassetsonnaturalgascontractsheld" abstract="false" name="Premiumsrecordedinothercurrentassetsonnaturalgascontractsheld" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_FairValueAssetsTransfersbetweenLevels" abstract="false" name="FairValueAssetsTransfersbetweenLevels" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_SecuritizedUtilityTariffBonds" abstract="false" name="SecuritizedUtilityTariffBonds" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_DiscountsAndIssuanceCostsForSecuritizedUtilityTariffBondsExcludingCurrentMaturities" abstract="false" name="DiscountsAndIssuanceCostsForSecuritizedUtilityTariffBondsExcludingCurrentMaturities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_VariableInterestEntityMeasureOfActivityIncomeTax" abstract="false" name="VariableInterestEntityMeasureOfActivityIncomeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_VariableInterestEntityMeasureOfActivityNetIncome" abstract="false" name="VariableInterestEntityMeasureOfActivityNetIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_OtherIncomeDeferredCarryingCostNonGAAP" abstract="false" name="OtherIncomeDeferredCarryingCostNonGAAP" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_IncomeTaxExpenseBenefitOfDeferredCarryingCostNonGAAP" abstract="false" name="IncomeTaxExpenseBenefitOfDeferredCarryingCostNonGAAP" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ogs_AdjustedNetIncomeNonGAAP" abstract="false" name="AdjustedNetIncomeNonGAAP" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
