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  <xsd:element id="bkh_PropertyPlantEquipmentExcludingConstructionInProgress" name="PropertyPlantEquipmentExcludingConstructionInProgress" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="bkh_PublicUtilitiesAmountOfRequestedSystemSafetyAndIntegrityRiderBeMovedToBaseRates" name="PublicUtilitiesAmountOfRequestedSystemSafetyAndIntegrityRiderBeMovedToBaseRates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
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  <xsd:element id="bkh_PublicUtilitiesLengthOfElectricDistributionLinesToReceiveInfrastructureInvestments" name="PublicUtilitiesLengthOfElectricDistributionLinesToReceiveInfrastructureInvestments" type="dtr-types:lengthItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="bkh_PublicUtilitiesLengthOfElectricTransmissionLinesToReceiveInfrastructureInvestments" name="PublicUtilitiesLengthOfElectricTransmissionLinesToReceiveInfrastructureInvestments" type="dtr-types:lengthItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="bkh_PublicUtilitiesLengthOfNaturalGasPipelineToReceiveInfrastructureInvestments" name="PublicUtilitiesLengthOfNaturalGasPipelineToReceiveInfrastructureInvestments" type="dtr-types:lengthItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="bkh_PublicUtilitiesNumberOfFormerRidersReplacedWithANewComprehensiveSafetyAndIntegrityRider" name="PublicUtilitiesNumberOfFormerRidersReplacedWithANewComprehensiveSafetyAndIntegrityRider" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
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  <xsd:element id="bkh_PublicUtilitiesTermOfPowerPurchaseAgreement" name="PublicUtilitiesTermOfPowerPurchaseAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="bkh_RemainingTaxExpenseRelatedToIncreaseInValuationAllowance" name="RemainingTaxExpenseRelatedToIncreaseInValuationAllowance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="bkh_RevenueRefundedToCustomersAsAResultOfTheTCJATaxBenefits" name="RevenueRefundedToCustomersAsAResultOfTheTCJATaxBenefits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="bkh_SettlementOfPlanToProvideTCJAAndStateTaxReformBenefitsToCustomersAnnually" name="SettlementOfPlanToProvideTCJAAndStateTaxReformBenefitsToCustomersAnnually" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
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  <xsd:element id="bkh_StormCarryingCostsOneTimeTrueUpToCommissionAuthorizedRates" name="StormCarryingCostsOneTimeTrueUpToCommissionAuthorizedRates" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
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  <xsd:element id="bkh_AssetRetirementObligationCostsLineItems" name="AssetRetirementObligationCostsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_AllowanceForFundsUsedDuringConstructionMember" name="AllowanceForFundsUsedDuringConstructionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_APSCAuthorizedMember" name="APSCAuthorizedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="bkh_BuschRanchIWindFarmMember" name="BuschRanchIWindFarmMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="bkh_CommonCollectiveTrustCashAndCashEquivalentsMember" name="CommonCollectiveTrustCashAndCashEquivalentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_CommonCollectiveTrustEquityFundMember" name="CommonCollectiveTrustEquityFundMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_CommonCollectiveTrustFixedIncomeFundMember" name="CommonCollectiveTrustFixedIncomeFundMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_ContractSubjecttoMasterNettingArrangementMember" name="ContractSubjecttoMasterNettingArrangementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_CorporateTermLoanDueJune2021Member" name="CorporateTermLoanDueJune2021Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_CushionGasDepreciableMember" name="CushionGasDepreciableMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="bkh_ElectricUtilitiesMember" name="ElectricUtilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="bkh_EnvironmentalMember" name="EnvironmentalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_ExternalCustomersMember" name="ExternalCustomersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_FederalEnergyRegulatoryCommissionFERCCommonUseSystemCUSMember" name="FederalEnergyRegulatoryCommissionFERCCommonUseSystemCUSMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="bkh_FirstMortgageBondsDue2044Member" name="FirstMortgageBondsDue2044Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="bkh_GasSupplyContractTerminationMember" name="GasSupplyContractTerminationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_GasUtilitiesMember" name="GasUtilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_GlobalSettlementAgreementWithKCCStaffAndVariousIntervenorsForAGeneralRateIncreaseAndRenewalOfItsSafetyAndIntegrityRiderMember" name="GlobalSettlementAgreementWithKCCStaffAndVariousIntervenorsForAGeneralRateIncreaseAndRenewalOfItsSafetyAndIntegrityRiderMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_GTResourcesLLCMember" name="GTResourcesLLCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_IndustrialDevelopmentRevenueBondsDue2021Member" name="IndustrialDevelopmentRevenueBondsDue2021Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="bkh_IntercompanyCustomersMember" name="IntercompanyCustomersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_InterestExpenseIncurredNetOfAmountsCapitalizedIncludingAmortizationOfDebtIssuanceCostsPremiumsAndDiscountsMember" name="InterestExpenseIncurredNetOfAmountsCapitalizedIncludingAmortizationOfDebtIssuanceCostsPremiumsAndDiscountsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
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  <xsd:element id="bkh_InterestRateSwapAndCommodityDerivativeMember" name="InterestRateSwapAndCommodityDerivativeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_IowaUtilitiesBoardIUBMember" name="IowaUtilitiesBoardIUBMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_KansasCorporationCommissionKCCMember" name="KansasCorporationCommissionKCCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_LiabilityHedgingAssetsMember" name="LiabilityHedgingAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_ManufacturedGasPlantMember" name="ManufacturedGasPlantMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_MarketOffSystemSalesMember" name="MarketOffSystemSalesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_NaturalGasDistributionMember" name="NaturalGasDistributionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_NaturalGasPhysicalPurchasesMember" name="NaturalGasPhysicalPurchasesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_NebraskaPublcServiceCommissionNPSCMember" name="NebraskaPublcServiceCommissionNPSCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_NebraskaPublicServiceCommissionNPSCMember" name="NebraskaPublicServiceCommissionNPSCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_OtherMember" name="OtherMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_OtherRegulatoryAssetsMember" name="OtherRegulatoryAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_OtherRegulatoryLiabilitiesMember" name="OtherRegulatoryLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PerformanceSharesEquityAwardsMember" name="PerformanceSharesEquityAwardsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PerformanceSharesLiabilityAwardsMember" name="PerformanceSharesLiabilityAwardsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PerformanceShareUnitsMarketConditionMember" name="PerformanceShareUnitsMarketConditionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PerformanceShareUnitsPerformanceConditionMember" name="PerformanceShareUnitsPerformanceConditionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PlantAcquisitionAdjustmentMember" name="PlantAcquisitionAdjustmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PowerGenerationMember" name="PowerGenerationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PowerPurchaseAgreementsMember" name="PowerPurchaseAgreementsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PowerPurchasedMember" name="PowerPurchasedMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PrincipalPaymentsOnLongTermDebtIncludingCurrentMaturitiesMember" name="PrincipalPaymentsOnLongTermDebtIncludingCurrentMaturitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PuebloAirportGenerationMember" name="PuebloAirportGenerationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PurchasedGasCostObligationMember" name="PurchasedGasCostObligationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_PurchasePowerContractMEANMember" name="PurchasePowerContractMEANMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_RateReviewApprovedByRegulatoryAgencyMember" name="RateReviewApprovedByRegulatoryAgencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_RateReviewFiledwiththeRegulatoryAgencyMember" name="RateReviewFiledwiththeRegulatoryAgencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_RetailElectricNaturalGasandCoalMember" name="RetailElectricNaturalGasandCoalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_ReturnSeekingAssetsMember" name="ReturnSeekingAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2021Member" name="SeniorUnsecuredNotesDue2021Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2023Member" name="SeniorUnsecuredNotesDue2023Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2024Member" name="SeniorUnsecuredNotesDue2024Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2026Member" name="SeniorUnsecuredNotesDue2026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2027Member" name="SeniorUnsecuredNotesDue2027Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2029Member" name="SeniorUnsecuredNotesDue2029Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2030Member" name="SeniorUnsecuredNotesDue2030Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2033Member" name="SeniorUnsecuredNotesDue2033Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2046Member" name="SeniorUnsecuredNotesDue2046Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SeniorUnsecuredNotesDue2049Member" name="SeniorUnsecuredNotesDue2049Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SettlementAgreementReachedWithCPUCStaffAndVariousIntervenorsSubjectToTheReviewAndApprovalByAnAdministrativeLawJudgeAndTheCPUCMember" name="SettlementAgreementReachedWithCPUCStaffAndVariousIntervenorsSubjectToTheReviewAndApprovalByAnAdministrativeLawJudgeAndTheCPUCMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SettlementReachedWithTheRegulatoryAgencyMember" name="SettlementReachedWithTheRegulatoryAgencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_SouthDakotaElectricMember" name="SouthDakotaElectricMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_TransmissionOtherMember" name="TransmissionOtherMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_TransmissionServicesAgreementsMember" name="TransmissionServicesAgreementsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_TransmissionTieMember" name="TransmissionTieMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_TransportationMember" name="TransportationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_TransportationStorageGatheringAndCoalAgreementsMember" name="TransportationStorageGatheringAndCoalAgreementsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_TriStateGenerationAndTransmissionAssociationMember" name="TriStateGenerationAndTransmissionAssociationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_UtilitiesGroupMember" name="UtilitiesGroupMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_WholesaleMember" name="WholesaleMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_WinterStormUriMember" name="WinterStormUriMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_WygenIGeneratingFacilityMember" name="WygenIGeneratingFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_WygenIIIGeneratingFacilityMember" name="WygenIIIGeneratingFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_WyodakPlantMember" name="WyodakPlantMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_WyomingElectricMember" name="WyomingElectricMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_WyomingPublicServiceCommissionMember" name="WyomingPublicServiceCommissionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_AssetRetirementObligationsTable" name="AssetRetirementObligationsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="bkh_CreditFacilityAndShortTermDebtCovenantsTableTextBlock" name="CreditFacilityAndShortTermDebtCovenantsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="bkh_DeferredFinancingCostsTableTextBlock" name="DeferredFinancingCostsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="bkh_JointlyOwnedFacilitiesUtilityandNonRegulatedTextBlock" name="JointlyOwnedFacilitiesUtilityandNonRegulatedTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="bkh_PerformancePlanPayoutsTableTextBlock" name="PerformancePlanPayoutsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="bkh_ScheduleOfEmployerContributionToEmployeeBenefitPlansTableTextBlock" name="ScheduleOfEmployerContributionToEmployeeBenefitPlansTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="bkh_ScheduleOfJointlyOwnedFacilitiesTableTextBlock" name="ScheduleOfJointlyOwnedFacilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="bkh_ScheduleOfRegulatoryAssetsAndLiabilitiesTableTextBlock" name="ScheduleOfRegulatoryAssetsAndLiabilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="bkh_ScheduleofUnitContingentCapacityTableTextBlock" name="ScheduleofUnitContingentCapacityTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="bkh_SummaryOfAtTheMarkeActivityTableTextBlock" name="SummaryOfAtTheMarkeActivityTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
</xsd:schema>
