NORTHERN STATES POWER CO000112385212/312024Q1false3/31/2024http://fasb.org/us-gaap/2024#OtherLiabilitiesCurrenthttp://fasb.org/us-gaap/2024#OtherLiabilitiesCurrent00011238522024-01-012024-03-3100011238522024-04-25xbrli:sharesiso4217:USD00011238522023-01-012023-03-310001123852us-gaap:RetainedEarningsMember2024-01-012024-03-310001123852us-gaap:RetainedEarningsMember2023-01-012023-03-3100011238522023-12-3100011238522022-12-3100011238522024-03-3100011238522023-03-310001123852us-gaap:RelatedPartyMember2024-03-310001123852us-gaap:RelatedPartyMember2023-12-310001123852srt:AffiliatedEntityMember2024-03-310001123852srt:AffiliatedEntityMember2023-12-31iso4217:USDxbrli:shares0001123852us-gaap:CommonStockMember2022-12-310001123852us-gaap:AdditionalPaidInCapitalMember2022-12-310001123852us-gaap:RetainedEarningsMember2022-12-310001123852us-gaap:AccumulatedOtherComprehensiveIncomeMember2022-12-310001123852us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-01-012023-03-310001123852us-gaap:AdditionalPaidInCapitalMember2023-01-012023-03-310001123852us-gaap:CommonStockMember2023-03-310001123852us-gaap:AdditionalPaidInCapitalMember2023-03-310001123852us-gaap:RetainedEarningsMember2023-03-310001123852us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-03-310001123852us-gaap:CommonStockMember2023-12-310001123852us-gaap:AdditionalPaidInCapitalMember2023-12-310001123852us-gaap:RetainedEarningsMember2023-12-310001123852us-gaap:AccumulatedOtherComprehensiveIncomeMember2023-12-310001123852us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-01-012024-03-310001123852us-gaap:AdditionalPaidInCapitalMember2024-01-012024-03-310001123852us-gaap:CommonStockMember2024-03-310001123852us-gaap:AdditionalPaidInCapitalMember2024-03-310001123852us-gaap:RetainedEarningsMember2024-03-310001123852us-gaap:AccumulatedOtherComprehensiveIncomeMember2024-03-310001123852us-gaap:PublicUtilitiesInventorySuppliesMember2024-03-310001123852us-gaap:PublicUtilitiesInventorySuppliesMember2023-12-310001123852us-gaap:PublicUtilitiesInventoryFuelMember2024-03-310001123852us-gaap:PublicUtilitiesInventoryFuelMember2023-12-310001123852us-gaap:PublicUtilitiesInventoryNaturalGasMember2024-03-310001123852us-gaap:PublicUtilitiesInventoryNaturalGasMember2023-12-310001123852us-gaap:ElectricGenerationEquipmentMember2024-03-310001123852us-gaap:ElectricGenerationEquipmentMember2023-12-310001123852us-gaap:GasTransmissionEquipmentMember2024-03-310001123852us-gaap:GasTransmissionEquipmentMember2023-12-310001123852us-gaap:OtherCapitalizedPropertyPlantAndEquipmentMember2024-03-310001123852us-gaap:OtherCapitalizedPropertyPlantAndEquipmentMember2023-12-310001123852nspm:PlantToBeRetiredMember2024-03-310001123852nspm:PlantToBeRetiredMember2023-12-310001123852us-gaap:ConstructionInProgressMember2024-03-310001123852us-gaap:ConstructionInProgressMember2023-12-310001123852us-gaap:NuclearFuelMember2024-03-310001123852us-gaap:NuclearFuelMember2023-12-310001123852nspm:MoneyPoolMember2024-01-012024-03-310001123852nspm:MoneyPoolMember2024-03-310001123852nspm:MoneyPoolMember2023-12-310001123852nspm:MoneyPoolMember2023-01-012023-12-31xbrli:pure0001123852us-gaap:CommercialPaperMember2024-01-012024-03-310001123852us-gaap:CommercialPaperMember2024-03-310001123852us-gaap:CommercialPaperMember2023-12-310001123852us-gaap:CommercialPaperMember2023-01-012023-12-310001123852us-gaap:LetterOfCreditMember2024-03-310001123852us-gaap:LetterOfCreditMember2023-12-310001123852us-gaap:RevolvingCreditFacilityMember2024-01-012024-03-310001123852us-gaap:RevolvingCreditFacilityMember2024-03-310001123852us-gaap:RevolvingCreditFacilityMember2023-12-310001123852nspm:NspMinnesotaMemberus-gaap:LetterOfCreditMembernspm:BilateralCreditAgreementMember2024-01-012024-03-310001123852us-gaap:LetterOfCreditMembernspm:BilateralCreditAgreementMember2024-03-310001123852nspm:SeriesDueMarch152054Memberus-gaap:BondsMember2024-03-310001123852nspm:RetailDistributionMembernspm:ResidentialCustomersMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:ResidentialCustomersMembernspm:RegulatedNaturalGasMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMembernspm:RetailDistributionMembernspm:ResidentialCustomersMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:ResidentialCustomersMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:CommercialandIndustrialCustomersMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:CommercialandIndustrialCustomersMembernspm:RegulatedNaturalGasMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMembernspm:RetailDistributionMembernspm:CommercialandIndustrialCustomersMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:CommercialandIndustrialCustomersMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:OtherCustomersMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:OtherCustomersMembernspm:RegulatedNaturalGasMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMembernspm:RetailDistributionMembernspm:OtherCustomersMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:OtherCustomersMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:RegulatedNaturalGasMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMembernspm:RetailDistributionMember2024-01-012024-03-310001123852nspm:RetailDistributionMember2024-01-012024-03-310001123852nspm:WholesaleDistributionMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:WholesaleDistributionMembernspm:RegulatedNaturalGasMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMembernspm:WholesaleDistributionMember2024-01-012024-03-310001123852nspm:WholesaleDistributionMember2024-01-012024-03-310001123852nspm:TransmissionServicesMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:TransmissionServicesMembernspm:RegulatedNaturalGasMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMembernspm:TransmissionServicesMember2024-01-012024-03-310001123852nspm:TransmissionServicesMember2024-01-012024-03-310001123852nspm:InterchangeMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:RegulatedNaturalGasMembernspm:InterchangeMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMembernspm:InterchangeMember2024-01-012024-03-310001123852nspm:InterchangeMember2024-01-012024-03-310001123852nspm:OtherServicesMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:RegulatedNaturalGasMembernspm:OtherServicesMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMembernspm:OtherServicesMember2024-01-012024-03-310001123852nspm:OtherServicesMember2024-01-012024-03-310001123852us-gaap:ProductMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852us-gaap:ProductMembernspm:RegulatedNaturalGasMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMemberus-gaap:ProductMember2024-01-012024-03-310001123852us-gaap:ProductMember2024-01-012024-03-310001123852nspm:AlternativeandOtherMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:RegulatedNaturalGasMembernspm:AlternativeandOtherMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMembernspm:AlternativeandOtherMember2024-01-012024-03-310001123852nspm:AlternativeandOtherMember2024-01-012024-03-310001123852us-gaap:OperatingSegmentsMembernspm:RegulatedElectricMember2024-01-012024-03-310001123852us-gaap:OperatingSegmentsMembernspm:RegulatedNaturalGasMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMemberus-gaap:OperatingSegmentsMember2024-01-012024-03-310001123852us-gaap:OperatingSegmentsMember2024-01-012024-03-310001123852nspm:RetailDistributionMembernspm:ResidentialCustomersMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:ResidentialCustomersMembernspm:RegulatedNaturalGasMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMembernspm:RetailDistributionMembernspm:ResidentialCustomersMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:ResidentialCustomersMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:CommercialandIndustrialCustomersMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:CommercialandIndustrialCustomersMembernspm:RegulatedNaturalGasMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMembernspm:RetailDistributionMembernspm:CommercialandIndustrialCustomersMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:CommercialandIndustrialCustomersMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:OtherCustomersMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:OtherCustomersMembernspm:RegulatedNaturalGasMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMembernspm:RetailDistributionMembernspm:OtherCustomersMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:OtherCustomersMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852nspm:RetailDistributionMembernspm:RegulatedNaturalGasMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMembernspm:RetailDistributionMember2023-01-012023-03-310001123852nspm:RetailDistributionMember2023-01-012023-03-310001123852nspm:WholesaleDistributionMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852nspm:WholesaleDistributionMembernspm:RegulatedNaturalGasMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMembernspm:WholesaleDistributionMember2023-01-012023-03-310001123852nspm:WholesaleDistributionMember2023-01-012023-03-310001123852nspm:TransmissionServicesMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852nspm:TransmissionServicesMembernspm:RegulatedNaturalGasMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMembernspm:TransmissionServicesMember2023-01-012023-03-310001123852nspm:TransmissionServicesMember2023-01-012023-03-310001123852nspm:InterchangeMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852nspm:RegulatedNaturalGasMembernspm:InterchangeMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMembernspm:InterchangeMember2023-01-012023-03-310001123852nspm:InterchangeMember2023-01-012023-03-310001123852us-gaap:ProductMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852us-gaap:ProductMembernspm:RegulatedNaturalGasMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMemberus-gaap:ProductMember2023-01-012023-03-310001123852us-gaap:ProductMember2023-01-012023-03-310001123852nspm:AlternativeandOtherMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852nspm:RegulatedNaturalGasMembernspm:AlternativeandOtherMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMembernspm:AlternativeandOtherMember2023-01-012023-03-310001123852nspm:AlternativeandOtherMember2023-01-012023-03-310001123852us-gaap:OperatingSegmentsMembernspm:RegulatedElectricMember2023-01-012023-03-310001123852us-gaap:OperatingSegmentsMembernspm:RegulatedNaturalGasMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMemberus-gaap:OperatingSegmentsMember2023-01-012023-03-310001123852us-gaap:OperatingSegmentsMember2023-01-012023-03-3100011238522023-01-012023-06-300001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashAndCashEquivalentsMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashAndCashEquivalentsMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashAndCashEquivalentsMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashAndCashEquivalentsMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:CashAndCashEquivalentsMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMembernspm:CommingledFundsMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:DebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:EquitySecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CarryingReportedAmountFairValueDisclosureMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:EstimateOfFairValueFairValueDisclosureMember2023-12-310001123852us-gaap:InterestRateSwapMember2024-03-310001123852nspm:CashflowhedgecommodityMember2024-03-310001123852nspm:ElectricCommodityMember2024-03-31utr:MWh0001123852nspm:ElectricCommodityMember2023-12-310001123852nspm:NaturalGasCommodityContractMember2024-03-31utr:MMBTU0001123852nspm:NaturalGasCommodityContractMember2023-12-310001123852us-gaap:CreditConcentrationRiskMemberus-gaap:ExternalCreditRatingInvestmentGradeMember2024-03-31nspm:Counterparty0001123852us-gaap:CreditConcentrationRiskMember2024-03-310001123852us-gaap:InternalInvestmentGradeMemberus-gaap:CreditConcentrationRiskMember2024-03-310001123852us-gaap:InternalInvestmentGradeMemberus-gaap:CreditConcentrationRiskMembersrt:MinimumMember2024-03-310001123852us-gaap:CreditConcentrationRiskMemberus-gaap:ExternalCreditRatingNonInvestmentGradeMember2024-03-310001123852us-gaap:CreditConcentrationRiskMembernspm:MunicipalorCooperativeEntitiesorOtherUtilitiesMember2024-03-310001123852us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:InterestRateContractMember2024-01-012024-03-310001123852us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMember2024-01-012024-03-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMember2024-01-012024-03-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityMember2024-01-012024-03-310001123852us-gaap:NondesignatedMembernspm:NaturalGasCommodityMember2024-01-012024-03-310001123852us-gaap:NondesignatedMember2024-01-012024-03-310001123852us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:InterestRateContractMember2023-01-012023-03-310001123852us-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMember2023-01-012023-03-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMember2023-01-012023-03-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityMember2023-01-012023-03-310001123852us-gaap:NondesignatedMembernspm:NaturalGasCommodityMember2023-01-012023-03-310001123852us-gaap:NondesignatedMember2023-01-012023-03-310001123852us-gaap:NondesignatedMembernspm:CommodityTradingContractMember2024-01-012024-03-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMember2024-01-012024-03-310001123852us-gaap:NondesignatedMembernspm:CommodityTradingContractMember2023-01-012023-03-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMember2023-01-012023-03-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CommodityContractMember2024-03-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMember2024-03-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CommodityContractMember2023-12-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMember2023-12-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:NondesignatedMembernspm:ElectricCommodityContractMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852nspm:NaturalGasCommodityContractMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMember2023-12-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CommodityContractMember2024-03-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMember2024-03-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:CommodityContractMember2023-12-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:CommodityContractMember2023-12-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2024-03-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2023-12-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:OtherNoncurrentAssetsMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherCurrentLiabilitiesMember2024-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherCurrentLiabilitiesMember2024-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherCurrentLiabilitiesMember2024-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMember2024-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherCurrentLiabilitiesMember2023-12-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherCurrentLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherCurrentLiabilitiesMember2023-12-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherCurrentLiabilitiesMember2023-12-310001123852us-gaap:InterestRateSwapMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:CashFlowHedgingMemberus-gaap:FairValueMeasurementsRecurringMember2023-12-310001123852us-gaap:FairValueMeasurementsNonrecurringMembernspm:PurchasedPowerAgreementsMember2024-03-310001123852us-gaap:FairValueMeasurementsNonrecurringMembernspm:PurchasedPowerAgreementsMember2023-12-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CommodityContractMember2024-03-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CommodityContractMember2024-03-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CommodityContractMember2023-12-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CommodityContractMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:NondesignatedMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:CommodityContractMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:FairValueInputsLevel1Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherNoncurrentLiabilitiesMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMember2024-03-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:FairValueInputsLevel1Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:OtherNoncurrentLiabilitiesMember2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMemberus-gaap:FairValueInputsLevel3Member2023-12-310001123852us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherNoncurrentLiabilitiesMember2023-12-310001123852us-gaap:CommodityContractMember2023-12-310001123852us-gaap:CommodityContractMember2022-12-310001123852us-gaap:CommodityContractMember2024-01-012024-03-310001123852us-gaap:CommodityContractMember2023-01-012023-03-310001123852us-gaap:CommodityContractMember2024-03-310001123852us-gaap:CommodityContractMember2023-03-310001123852us-gaap:FairValueInputsLevel2Member2024-03-310001123852us-gaap:FairValueInputsLevel2Member2023-12-310001123852us-gaap:PensionPlansDefinedBenefitMember2024-01-012024-03-310001123852us-gaap:PensionPlansDefinedBenefitMember2023-01-012023-03-310001123852us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2024-01-012024-03-310001123852us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2023-01-012023-03-310001123852srt:ParentCompanyMemberus-gaap:PensionPlansDefinedBenefitMember2024-01-012024-01-310001123852us-gaap:PensionPlansDefinedBenefitMember2024-01-012024-01-3100011238522021-01-012021-01-3100011238522021-01-310001123852nspm:NspMinnesotaMember2023-09-220001123852nspm:OtherMGPLandfillOrDisposalSitesMember2024-03-310001123852nspm:FederalCleanWaterActSection316bMemberus-gaap:CapitalAdditionsMember2024-03-310001123852nspm:PurchasedPowerAgreementsMember2024-01-012024-03-310001123852nspm:PurchasedPowerAgreementsMember2023-01-012023-03-310001123852us-gaap:PropertyPlantAndEquipmentOtherTypesMember2024-01-012024-03-310001123852us-gaap:PropertyPlantAndEquipmentOtherTypesMember2023-01-012023-03-310001123852nspm:PurchasedPowerAgreementsMember2024-03-310001123852us-gaap:PropertyPlantAndEquipmentOtherTypesMember2024-03-310001123852us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember2023-12-31utr:MW0001123852us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-12-310001123852us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-12-310001123852us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2022-12-310001123852us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2022-12-310001123852us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2024-01-012024-03-310001123852us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-01-012024-03-310001123852us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-01-012023-03-310001123852us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-01-012023-03-310001123852us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:InterestRateSwapMember2024-01-012024-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-01-012024-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2024-01-012024-03-310001123852us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:InterestRateSwapMember2023-01-012023-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-01-012023-03-310001123852us-gaap:InterestRateSwapMemberus-gaap:AccumulatedOtherComprehensiveIncomeMember2023-01-012023-03-310001123852us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2024-03-310001123852us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2024-03-310001123852us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2023-03-310001123852us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2023-03-310001123852nspm:RegulatedElectricMember2024-01-012024-03-310001123852nspm:RegulatedElectricMember2023-01-012023-03-310001123852nspm:RegulatedNaturalGasMemberus-gaap:IntersegmentEliminationMember2024-01-012024-03-310001123852nspm:RegulatedNaturalGasMemberus-gaap:IntersegmentEliminationMember2023-01-012023-03-310001123852nspm:RegulatedNaturalGasMember2024-01-012024-03-310001123852nspm:RegulatedNaturalGasMember2023-01-012023-03-310001123852us-gaap:AllOtherSegmentsMember2024-01-012024-03-310001123852us-gaap:AllOtherSegmentsMember2023-01-012023-03-310001123852us-gaap:IntersegmentEliminationMember2024-01-012024-03-310001123852us-gaap:IntersegmentEliminationMember2023-01-012023-03-31


UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
(Mark One)
QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended March 31, 2024
or
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from to

Commission File Number: 001-31387
Northern States Power Company
(Exact Name of Registrant as Specified in its Charter)
Minnesota41-1967505
(State or Other Jurisdiction of Incorporation or Organization)(I.R.S. Employer Identification No.)
414 Nicollet MallMinneapolisMinnesota55401
(Address of Principal Executive Offices)(Zip Code)
(612)330-5500
(Registrant’s Telephone Number, Including Area Code)
N/A
(Former name, former address and former fiscal year, if changed since last report)
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading Symbol(s)Name of each exchange on which registered
N/AN/AN/A
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes No
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes No
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company.  See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Large accelerated filerAccelerated filer
Non-accelerated filerSmaller reporting company
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes  No
Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.
Class Outstanding at April 25, 2024
Common Stock, $0.01 par value 1,000,000 shares
Northern States Power Company meets the conditions set forth in General Instructions H(1)(a) and (b) of Form 10-Q and is therefore filing this Form 10-Q with the reduced disclosure format specified in General Instruction H(2) to such Form 10-Q.



TABLE OF CONTENTS
PART IFINANCIAL INFORMATION
Item 1 —
Item 2 —
Item 4 —
PART IIOTHER INFORMATION
Item 1 —
Item 1A —
Item 5 —
Item 6 —
This Form 10-Q is filed by NSP-Minnesota. NSP-Minnesota is a wholly owned subsidiary of Xcel Energy Inc. Additional information on Xcel Energy is available in various filings with the SEC. This report should be read in its entirety.



Definitions of Abbreviations
Xcel Energy Inc.’s Subsidiaries and Affiliates (current and former)
NSP-MinnesotaNorthern States Power Company, a Minnesota corporation
NSP SystemThe electric production and transmission system of NSP-Minnesota and NSP-Wisconsin operated on an integrated basis and managed by NSP-Minnesota
NSP-WisconsinNorthern States Power Company, a Wisconsin corporation
PSCoPublic Service Company of Colorado
SPSSouthwestern Public Service Company
Utility subsidiariesNSP-Minnesota, NSP-Wisconsin, PSCo and SPS
Xcel EnergyXcel Energy Inc. and its subsidiaries
Federal and State Regulatory Agencies
D.C. CircuitUnited States Court of Appeals for the District of Columbia Circuit
DOCMinnesota Department of Commerce
EPAUnited States Environmental Protection Agency
FERCFederal Energy Regulatory Commission
MPUCMinnesota Public Utilities Commission
NDPSCNorth Dakota Public Service Commission
OAGMinnesota Office of Attorney General
SECSecurities and Exchange Commission
SDPUCSouth Dakota Public Utilities Commission
Other
ALJAdministrative Law Judge
C&ICommercial and Industrial
CCRCoal combustion residuals
CCR RuleFinal rule (40 CFR 257.50 - 257.107) published by the EPA regulating the management, storage and disposal of CCRs as nonhazardous waste
CEOChief executive officer
CERCLA
Comprehensive Environmental Response, Compensation, and Liability Act
CFOChief financial officer
CSPVCrystalline Silicon Photovoltaic
CUBCitizens Utility Board
ETREffective tax rate
FTRFinancial transmission right
GAAPUnited States generally accepted accounting principles
GEGeneral Electric Company
IPPIndependent power producing entity
MGPManufactured gas plant
MISOMidcontinent Independent System Operator, Inc.
NAVNet asset value
NOxNitrogen Oxides
O&MOperating and maintenance
PFAS
Per- and Polyfluoroalkyl Substances
PPAPower purchase agreement
PTCProduction tax credit
RFPRequest for proposal
ROEReturn on equity
RTORegional Transmission Organization
SMMPASouthern Minnesota Municipal Power Agency
Measurements
MWMegawatts

Forward-Looking Statements
Except for the historical statements contained in this report, the matters discussed herein are forward-looking statements that are subject to certain risks, uncertainties and assumptions. Such forward-looking statements, including those relating to future sales, future expenses, future tax rates, future operating performance, estimated base capital expenditures and financing plans, projected capital additions and forecasted annual revenue requirements with respect to rider filings, expected rate increases to customers, expectations and intentions regarding regulatory proceedings, and expected impact on our results of operations, financial condition and cash flows of resettlement calculations and credit losses relating to certain energy transactions, as well as assumptions and other statements are intended to be identified in this document by the words “anticipate,” “believe,” “could,” “estimate,” “expect,” “intend,” “may,” “objective,” “outlook,” “plan,” “project,” “possible,” “potential,” “should,” “will,” “would” and similar expressions. Actual results may vary materially. Forward-looking statements speak only as of the date they are made, and we expressly disclaim any obligation to update any forward-looking information. The following factors, in addition to those discussed in NSP-Minnesota’s Annual Report on Form 10-K for the fiscal year ended Dec. 31, 2023 and subsequent filings with the SEC, could cause actual results to differ materially from management expectations as suggested by such forward-looking information: operational safety, including our nuclear generation facilities and other utility operations; successful long-term operational planning; commodity risks associated with energy markets and production; rising energy prices and fuel costs; qualified employee workforce and third-party contractor factors; violations of our Codes of Conduct; our ability to recover costs; changes in regulation; reductions in our credit ratings and the cost of maintaining certain contractual relationships; general economic conditions, including recessionary conditions, inflation rates, monetary fluctuations, supply chain constraints and their impact on capital expenditures and/or the ability of NSP-Minnesota to obtain financing on favorable terms; availability or cost of capital; our customers’ and counterparties’ ability to pay their debts to us; assumptions and costs relating to funding our employee benefit plans and health care benefits; tax laws; uncertainty regarding epidemics, the duration and magnitude of business restrictions including shutdowns (domestically and globally), the potential impact on the workforce, including shortages of employees or third-party contractors due to quarantine policies, vaccination requirements or government restrictions, impacts on the transportation of goods and the generalized impact on the economy; effects of geopolitical events, including war and acts of terrorism; cybersecurity threats and data security breaches; seasonal weather patterns; changes in environmental laws and regulations; climate change and other weather events; natural disaster and resource depletion, including compliance with any accompanying legislative and regulatory changes; costs of potential regulatory penalties and wildfire damages in excess of liability insurance coverage; regulatory changes and/or limitations related to the use of natural gas as an energy source; challenging labor market conditions and our ability to attract and retain a qualified workforce; and our ability to execute on our strategies or achieve expectations related to environmental, social and governance matters including as a result of evolving legal, regulatory and other standards, processes, and assumptions, the pace of scientific and technological developments, increased costs, the availability of requisite financing, and changes in carbon markets.



Table of Contents
PART I FINANCIAL INFORMATION
ITEM 1 — FINANCIAL STATEMENTS

NSP-MINNESOTA AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
(amounts in millions)
Three Months Ended March 31
20242023
Operating revenues
Electric, non-affiliates$1,133 $1,131 
Electric, affiliates122 125 
Natural gas273 400 
Other8 10 
Total operating revenues1,536 1,666 
Operating expenses
Electric fuel and purchased power459 505 
Cost of natural gas sold and transported139 297 
Cost of sales — other4 7 
Operating and maintenance expenses295 325 
Conservation program expenses48 31 
Depreciation and amortization268 262 
Taxes (other than income taxes)68 78 
Total operating expenses1,281 1,505 
Operating income255 161 
Other income, net5  
Allowance for funds used during construction — equity11 8 
Interest charges and financing costs
Interest charges and other financing costs88 77 
Allowance for funds used during construction — debt(5)(5)
Total interest charges and financing costs83 72 
Income before income taxes188 97 
Income tax benefit(23)(42)
Net income$211 $139 

See Notes to Consolidated Financial Statements
4

Table of Contents
NSP-MINNESOTA AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)
(amounts in millions)
Three Months Ended March 31
20242023
Net income$211 $139 
Other comprehensive income
Derivative instruments:
Net fair value increase (decrease), net of tax12 (3)
Total other comprehensive income12 (3)
Total comprehensive income$223 $136 

See Notes to Consolidated Financial Statements
5

Table of Contents
NSP-MINNESOTA AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)
(amounts in millions)
Three Months Ended March 31
20242023
Operating activities
Net income$211 $139 
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization270 264 
Nuclear fuel amortization20 29 
Deferred income taxes112 (30)
Allowance for equity funds used during construction(11)(8)
Provision for bad debts6 8 
Changes in operating assets and liabilities:
Accounts receivable16 (18)
Accrued unbilled revenues13 112 
Inventories15 68 
Other current assets(74)(29)
Accounts payable(21)(133)
Net regulatory assets and liabilities(7)157 
Other current liabilities(170)44 
Pension and other employee benefit obligations(42)(22)
Other, net12 6 
Net cash provided by operating activities350 587 
Investing activities
Capital/construction expenditures(612)(532)
Purchase of investment securities(189)(236)
Proceeds from the sale of investment securities179 228 
Investments in utility money pool arrangement(317)(5)
Repayments from utility money pool arrangement129  
Other, net(2)(2)
Net cash used in investing activities(812)(547)
Financing activities
Repayments of short-term borrowings, net(165)(87)
Borrowings under utility money pool arrangement100  
Repayments under utility money pool arrangement(100) 
Proceeds from issuance of long-term debt688  
Capital contributions from parent347 151 
Dividends paid to parent(121)(122)
Net cash provided by (used in) financing activities749 (58)
Net change in cash, cash equivalents and restricted cash287 (18)
Cash, cash equivalents and restricted cash at beginning of period34 65 
Cash, cash equivalents and restricted cash at end of period$321 $47 
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)$(69)$(69)
Cash received from (paid for) income taxes, net; includes proceeds from tax credit transfers76 (5)
Supplemental disclosure of non-cash investing and financing transactions:
Accrued property, plant and equipment additions$149 $170 
Inventory transfers to property, plant and equipment9 9 
Operating lease right-of-use assets 29 
Allowance for equity funds used during construction11 8 

See Notes to Consolidated Financial Statements
6

Table of Contents
NSP-MINNESOTA AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS (UNAUDITED)
(amounts in millions, except share and per share data)
March 31, 2024Dec. 31, 2023
Assets
Current assets
Cash and cash equivalents$321 $34 
Accounts receivable, net471 490 
Accounts receivable from affiliates12 15 
Investments in money pool arrangements245 57 
Accrued unbilled revenues277 290 
Inventories332 356 
Regulatory assets354 250 
Derivative instruments34 50 
Prepayments and other161 87 
Total current assets2,207 1,629 
Property, plant and equipment, net19,097 18,757 
Other assets
Nuclear decommissioning fund and other investments3,403 3,262 
Regulatory assets817 837 
Derivative instruments71 61 
Operating lease right-of-use assets417 439 
Other11 16 
Total other assets4,719 4,615 
Total assets$26,023 $25,001 
Liabilities and Equity
Current liabilities
Short-term debt 165 
Accounts payable531 579 
Accounts payable to affiliates61 89 
Regulatory liabilities326 300 
Taxes accrued274 223 
Accrued interest90 79 
Dividends payable to parent101 121 
Derivative instruments37 44 
Operating lease liabilities93 91 
Other149 351 
Total current liabilities1,662 2,042 
Deferred credits and other liabilities
Deferred income taxes2,147 1,992 
Deferred investment tax credits14 14 
Regulatory liabilities2,225 2,097 
Asset retirement obligations2,689 2,658 
Derivative instruments90 86 
Pension and employee benefit obligations128 168 
Operating lease liabilities347 372 
Other28 35 
Total deferred credits and other liabilities7,668 7,422 
Commitments and contingencies
Capitalization
Long-term debt8,019 7,330 
Common stock — 5,000,000 shares authorized of $0.01 par value; 1,000,000 shares
outstanding at March 31, 2024 and Dec. 31, 2023, respectively
  
Additional paid in capital6,031 5,686 
Retained earnings2,651 2,541 
Accumulated other comprehensive loss(8)(20)
Total common stockholder's equity8,674 8,207 
Total liabilities and equity$26,023 $25,001 
See Notes to Consolidated Financial Statements
7

Table of Contents
NSP-MINNESOTA AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER’S EQUITY (UNAUDITED)
(amounts in millions, except share data)
Common Stock IssuedRetained EarningsAccumulated Other Comprehensive Loss Total Common Stockholder's Equity
SharesPar ValueAdditional Paid
In Capital
Three Months Ended March 31, 2024 and 2023
Balance at Dec. 31, 20221,000,000 $ $5,374 $2,480 $(18)$7,836 
Net income139 139 
Other comprehensive loss(3)(3)
Dividends declared to parent(132)(132)
Contribution of capital by parent110 110 
Balance at March 31, 20231,000,000 $ $5,484 $2,487 $(21)$7,950 
Balance at Dec. 31, 20231,000,000 $ $5,686 $2,541 $(20)$8,207 
Net income211 211 
Other comprehensive income12 12 
Dividends declared to parent(101)(101)
Contribution of capital by parent345 345 
Balance at March 31, 20241,000,000 $ $6,031 $2,651 $(8)$8,674 
See Notes to Consolidated Financial Statements

8

Table of Contents

NSP-MINNESOTA AND SUBSIDIARIES
Notes to Consolidated Financial Statements (UNAUDITED)
In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly, in accordance with GAAP, the financial position of NSP-Minnesota and its subsidiaries as of March 31, 2024 and Dec. 31, 2023; the results of NSP-Minnesota’s operations, including the components of net income and comprehensive income, cash flows and changes in stockholder’s equity for the three months ended March 31, 2024 and 2023.
All adjustments are of a normal, recurring nature, except as otherwise disclosed. Management has also evaluated the impact of events occurring after March 31, 2024 up to the date of issuance of these consolidated financial statements. These statements contain all necessary adjustments and disclosures resulting from that evaluation. The Dec. 31, 2023 balance sheet information has been derived from the audited 2023 consolidated financial statements included in the NSP-Minnesota Annual Report on Form 10-K for the year ended Dec. 31, 2023.
Notes to the consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP on an annual basis have been condensed or omitted pursuant to such rules and regulations. For further information, refer to the consolidated financial statements and notes thereto included in the NSP-Minnesota Annual Report on Form 10-K for the year ended Dec. 31, 2023, filed with the SEC on Feb. 21, 2024. Due to the seasonality of NSP-Minnesota’s electric and natural gas sales, interim results are not necessarily an appropriate base from which to project annual results.
1. Summary of Significant Accounting Policies
The significant accounting policies set forth in Note 1 to the consolidated financial statements in the NSP-Minnesota Annual Report on Form 10-K for the year ended Dec. 31, 2023 appropriately represent, in all material respects, the current status of accounting policies and are incorporated herein by reference.
2. Accounting Pronouncements
Recently Issued
Segment Reporting In November 2023, the FASB issued ASU 2023-07 – Segment Reporting (Topic 280) – Improvements to Reportable Segment Disclosures, which extends the existing requirements for annual disclosures to quarterly periods, and requires that both annual and quarterly disclosures present segment expenses using line items consistent with information regularly provided to the chief operating decision maker. The ASU is effective for annual periods beginning after Dec. 15, 2023 and quarterly periods beginning after Dec. 15, 2024, and Xcel Energy does not expect implementation of the new disclosure guidance to have a material impact to its consolidated financial statements.
Income Taxes In December 2023, the FASB issued ASU 2023-09 Income Taxes (Topic 740) – Improvements to Income Tax Disclosures, with new disclosure requirements including presentation of prescribed line items in the effective tax rate reconciliation and disclosures regarding state and local tax payments. The ASU is effective for annual periods beginning after Dec. 15, 2024, and Xcel Energy does not expect implementation of the new disclosure guidance to have a material impact to its consolidated financial statements.
Climate-Related Disclosures In March 2024, the SEC issued Final Rule 33-11275 – The Enhancement and Standardization of Climate-Related Disclosures for Investors. This rule requires registrants to provide standardized disclosures in Form 10-K related to climate-related risks, Scope 1 and 2 greenhouse gas emissions, as well as to include in a footnote to the consolidated financial statements the financial impact of severe weather events and other natural conditions. The rule requires implementation in phases between 2025 and 2033. In April 2024, the SEC announced that it would voluntarily stay its final climate disclosure rules pending judicial review. Xcel Energy does not expect implementation of the new guidance to have a material impact on the consolidated financial statements.
3. Selected Balance Sheet Data
(Millions of Dollars)March 31, 2024Dec. 31, 2023
Accounts receivable, net
Accounts receivable$516 $538 
Less allowance for bad debts(45)(48)
Accounts receivable, net$471 $490 
(Millions of Dollars)March 31, 2024Dec. 31, 2023
Inventories
Materials and supplies$222 $219 
Fuel104 105 
Natural gas6 32 
Total inventories$332 $356 
(Millions of Dollars)March 31, 2024Dec. 31, 2023
Property, plant and equipment, net
Electric plant$21,437 $21,206 
Natural gas plant2,273 2,256 
Common and other property1,316 1,301 
 Plant to be retired (a)
589 604 
Construction work in progress1,315 1,085 
Total property, plant and equipment26,930 26,452 
Less accumulated depreciation(8,204)(8,044)
Nuclear fuel3,379 3,337 
Less accumulated amortization(3,008)(2,988)
Property, plant and equipment, net$19,097 $18,757 
(a)Amounts include Sherco 1 and 3 and A.S. King. Balance is presented net of accumulated depreciation.
4. Borrowings and Other Financing Instruments
Short-Term Borrowings
NSP-Minnesota meets its short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under its credit facility and the money pool.
Money Pool — Xcel Energy and its utility subsidiaries have established a money pool arrangement that allows for short-term investments in and borrowings between the utility subsidiaries. Xcel Energy may make investments in the utility subsidiaries at market-based interest rates; however, the money pool arrangement does not allow the utility subsidiaries to make investments in Xcel Energy.

9

Table of Contents
Money pool borrowings:
(Amounts in Millions, Except Interest Rates)Three Months Ended March 31, 2024Year Ended Dec. 31, 2023
Borrowing limit$250 $250 
Amount outstanding at period end  
Average amount outstanding11 17 
Maximum amount outstanding100 135 
Weighted average interest rate, computed on a daily basis5.33 %4.97 %
Weighted average interest rate at period endN/AN/A
Commercial Paper Commercial paper outstanding:
(Amounts in Millions, Except Interest Rates)Three Months Ended March 31, 2024Year Ended Dec. 31, 2023
Borrowing limit$700 $700 
Amount outstanding at period end 165 
Average amount outstanding195 92 
Maximum amount outstanding400 441 
Weighted average interest rate, computed on a daily basis5.49 %4.99 %
Weighted average interest rate at period endN/A5.47 
Letters of Credit — NSP-Minnesota uses letters of credit, generally with terms of one year, to provide financial guarantees for certain obligations. There were $15 million of letters of credit outstanding under the credit facility at both March 31, 2024 and Dec. 31, 2023. Amounts approximate their fair value and are subject to fees.
Revolving Credit Facility — In order to issue its commercial paper, NSP-Minnesota must have a revolving credit facility equal to or greater than the commercial paper borrowing limit and cannot issue commercial paper exceeding available capacity under this credit facility. The credit facility provides short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.
NSP-Minnesota has the right to request an extension of the revolving credit facility termination date for two additional one-year periods. All extension requests are subject to majority bank group approval.
At March 31, 2024, NSP-Minnesota had the following committed revolving credit facility available (in millions of dollars):
Credit Facility (a)
Drawn (b)
Available
$700 $15 $685 
(a)Expires in September 2027.
(b)Includes outstanding commercial paper and letters of credit.
All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the credit facility. NSP-Minnesota had no direct advances on the credit facility outstanding at March 31, 2024 and Dec. 31, 2023.
Bilateral Credit Agreement — In April 2024, NSP-Minnesota’s uncommitted bilateral credit agreement was renewed for an additional one-year term. The credit agreement is limited in use to support letters of credit.
As of March 31, 2024, NSP-Minnesota had $65 million of outstanding letters of credit under the $75 million bilateral credit agreement.
Long-Term Borrowings
During the three months ended March 31, 2024, NSP-Minnesota issued $700 million of 5.40% first mortgage bonds due March 15, 2054.
5. Revenues
Revenue is classified by the type of goods/services rendered and market/customer type. NSP-Minnesota’s operating revenues consisted of the following:
Three Months Ended March 31, 2024
(Millions of Dollars)ElectricNatural GasAll OtherTotal
Major revenue types
Revenue from contracts with customers:
Residential$368 $138 $7 $513 
C&I522 90  612 
Other9  1 10 
Total retail899 228 8 1,135 
Wholesale75   75 
Transmission63   63 
Interchange122   122 
Other3 17  20 
Total revenue from contracts with customers1,162 245 8 1,415 
Alternative revenue and other93 28  121 
Total revenues$1,255 $273 $8 $1,536 
Three Months Ended March 31, 2023
(Millions of Dollars)ElectricNatural GasAll OtherTotal
Major revenue types
Revenue from contracts with customers:
Residential$358 $207 $9 $574 
C&I543 173  716 
Other8  1 9 
Total retail909 380 10 1,299 
Wholesale104   104 
Transmission64   64 
Interchange and other126 2  128 
Total revenue from contracts with customers1,203 382 10 1,595 
Alternative revenue and other53 18  71 
Total revenues$1,256 $400 $10 $1,666 
6. Income Taxes
Reconciliation between the statutory rate and ETR:
Three Months Ended March 31
20242023
Federal statutory rate21.0 %21.0 %
State tax (net of federal tax effect)7.0 7.0 
(Decreases) increases:
Wind PTCs (a)
(35.1)(65.1)
Plant regulatory differences (b)
(5.2)(6.2)
Other tax credits, net operating loss & tax credit allowances(1.0)(1.3)
Other (net)1.1 1.3 
Effective income tax rate(12.2)%(43.3)%
(a)Wind PTCs net of estimated transfer discounts are credited to customers (reduction to revenue) and do not materially impact net income.
(b)Plant regulatory differences primarily relate to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit are offset by corresponding revenue reductions.
10

Table of Contents
7.    Fair Value of Financial Assets and Liabilities
Fair Value Measurements
Accounting guidance for fair value measurements and disclosures provides a hierarchical framework for disclosing the observability of the inputs utilized in measuring assets and liabilities at fair value.
Level 1 — Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. The types of assets and liabilities included in Level 1 are actively traded instruments with observable actual trading prices.
Level 2 — Pricing inputs are other than actual trading prices in active markets, but are either directly or indirectly observable as of the reporting date. The types of assets and liabilities included in Level 2 are typically either comparable to actively traded securities or contracts, or priced with models using highly observable inputs.
Level 3 — Significant inputs to pricing have little or no observability as of the reporting date. The types of assets and liabilities included in Level 3 include those valued with models requiring significant judgment or estimation.
Specific valuation methods include:
Investments in equity securities and other funds Equity securities are valued using quoted prices in active markets. The fair values for commingled funds are measured using NAVs. The investments in commingled funds may be redeemed for NAV with proper notice. Private equity commingled funds require approval of the fund for any unscheduled redemption, and such redemptions may be approved or denied by the fund at its sole discretion. Unscheduled distributions from real estate commingled funds may be redeemed with proper notice, however, withdrawals may be delayed or discounted as a result of fund illiquidity.
Investments in debt securities Fair values for debt securities are determined by a third party pricing service using recent trades and observable spreads from benchmark interest rates for similar securities.
Interest rate derivatives — Fair values of interest rate derivatives are based on broker quotes that utilize current market interest rate forecasts.
Commodity derivatives Methods used to measure the fair value of commodity derivative forwards and options utilize forward prices and volatilities, as well as pricing adjustments for specific delivery locations, and are generally assigned a Level 2 classification.
When contracts relate to inactive delivery locations or extend to periods beyond those readily observable on active exchanges, the significance of the use of less observable inputs on a valuation is evaluated and may result in Level 3 classification.
Electric commodity derivatives held by NSP-Minnesota include transmission congestion instruments, generally referred to as FTRs. FTRs purchased from an RTO are financial instruments that entitle or obligate the holder to monthly revenues or charges based on transmission congestion across a given transmission path.
The values of these instruments are derived from, and designed to offset, the costs of transmission congestion. In addition to overall transmission load, congestion is also influenced by the operating schedules of power plants and the consumption of electricity pertinent to a given transmission path. Unplanned plant outages, scheduled plant maintenance, changes in the relative costs of fuels used in generation, weather and overall changes in demand for electricity can each impact the operating schedules of the power plants on the transmission grid and the value of these instruments.
FTRs are recognized at fair value and adjusted each period prior to settlement. Given the limited observability of certain variables underlying the reported auction values of FTRs, these fair value measurements have been assigned a Level 3 classification.
Net congestion costs, including the impact of FTR settlements are shared through fuel and purchased energy cost recovery mechanisms. As such, the fair value of the unsettled instruments (i.e., derivative asset or liability) is offset/deferred as a regulatory asset or liability.
Non-Derivative Fair Value Measurements
The Nuclear Regulatory Commission requires NSP-Minnesota to maintain a portfolio of investments to fund the costs of decommissioning its nuclear generating plants. Assets of the nuclear decommissioning fund are legally restricted for the purpose of decommissioning these facilities. The fund contains cash equivalents, debt securities, equity securities and other investments. NSP-Minnesota uses the MPUC approved asset allocation for the investment targets by asset class for the qualified trust.
NSP-Minnesota recognizes the costs of funding the decommissioning over the lives of the nuclear plants, assuming rate recovery of all costs. Realized and unrealized gains on fund investments over the life of the fund are deferred as an offset of NSP-Minnesota’s regulatory asset for nuclear decommissioning costs. Consequently, any realized and unrealized gains and losses on securities in the nuclear decommissioning fund are deferred as a component of the associated nuclear decommissioning costs.
Unrealized gains for the nuclear decommissioning fund were $1.3 billion and $1.2 billion as of March 31, 2024 and Dec. 31, 2023, and unrealized losses were $34 million and $29 million as of March 31, 2024 and Dec. 31, 2023, respectively.
Non-derivative instruments with recurring fair value measurements in the nuclear decommissioning fund:
March 31, 2024
Fair Value
(Millions of Dollars)CostLevel 1Level 2Level 3NAVTotal
Nuclear decommissioning fund (a)
Cash equivalents$57 $57 $ $ $ $57 
Commingled funds718    1,042 1,042 
Debt securities804  781 9  790 
Equity securities511 1,457 2   1,459 
Total$2,090 $1,514 $783 $9 $1,042 $3,348 
(a)Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $55 million of other investments, including the rabbi trust.
Dec. 31, 2023
Fair Value
(Millions of Dollars)CostLevel 1Level 2Level 3NAVTotal
Nuclear decommissioning fund (a)
Cash equivalents$41 $41 $ $ $ $41 
Commingled funds721    1,049 1,049 
Debt securities784  771 9  780 
Equity securities508 1,339 2   1,341 
Total$2,054 $1,380 $773 $9 $1,049 $3,211 
(a)Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $51 million of other investments, including the rabbi trust.
11

Table of Contents
For the three months ended March 31, 2024 and 2023, there were no Level 3 nuclear decommissioning fund investments or transfer of amounts between levels.
Contractual maturity dates of debt securities in the nuclear decommissioning fund as of March 31, 2024:
Final Contractual Maturity
(Millions of Dollars)Due in 1 Year or LessDue in 1 to 5 YearsDue in 5 to 10 YearsDue after 10 YearsTotal
Debt securities$6 $276 $257 $251 $790 
Derivative Activities and Fair Value Measurements
NSP-Minnesota enters into derivative instruments, including forward contracts, futures, swaps and options, for trading purposes and to manage risk in connection with changes in interest rates and utility commodity prices.
Interest Rate Derivatives — NSP-Minnesota enters into contracts that effectively fix the interest rate on a specified principal amount of a hypothetical future debt issuance. These financial swaps net settle based on changes in a specified benchmark interest rate, acting as a hedge of changes in market interest rates that will impact specified anticipated debt issuances. These derivative instruments are designated as cash flow hedges for accounting purposes, with changes in fair value prior to occurrence of the hedged transactions recorded as other comprehensive income.
As of March 31, 2024, accumulated other comprehensive loss related to interest rate derivatives included immaterial net losses expected to be reclassified into earnings during the next 12 months as the hedged transactions impact earnings. As of March 31, 2024, NSP-Minnesota had no unsettled interest rate derivatives.
See Note 10 for the financial impact of qualifying interest rate cash flow hedges on NSP-Minnesota’s accumulated other comprehensive loss included in the consolidated statements of common stockholder’s equity and in the consolidated statements of comprehensive income.
Wholesale and Commodity Trading — NSP-Minnesota conducts various wholesale and commodity trading activities, including the purchase and sale of electric capacity, energy, energy-related instruments and natural gas-related instruments, including derivatives. NSP-Minnesota is allowed to conduct these activities within guidelines and limitations as approved by its risk management committee, comprised of management personnel not directly involved in the activities governed by this policy.
Results of derivative instrument transactions entered into for trading purposes are presented in the consolidated statements of income as electric revenues, net of any sharing with customers. These activities are not intended to mitigate commodity price risk associated with regulated electric and natural gas operations. Sharing of these margins is determined through state regulatory proceedings as well as the operation of the FERC-approved joint operating agreement.
Commodity Derivatives — NSP-Minnesota enters into derivative instruments to manage variability of future cash flows from changes in commodity prices in its electric and natural gas operations. This could include the purchase or sale of energy or energy-related products, natural gas to generate electric energy, natural gas for resale and FTRs.
The most significant derivative positions outstanding at March 31, 2024 for this purpose relate to FTR instruments administered by MISO. These instruments are intended to offset the impacts of transmission system congestion.
When NSP-Minnesota enters into derivative instruments that mitigate commodity price risk on behalf of electric and natural gas customers, the instruments are not typically designated as qualifying hedging transactions. The classification of unrealized losses or gains on these instruments as a regulatory asset or liability, if applicable, is based on approved regulatory recovery mechanisms.
As of March 31, 2024, NSP-Minnesota had no commodity contracts designated as cash flow hedges.
Gross notional amounts of commodity forwards, options and FTRs:
(Amounts in Millions) (a)(b)
March 31, 2024Dec. 31, 2023
Megawatt hours of electricity24 38 
Million British thermal units of natural gas61 64 
(a)Not reflective of net positions in the underlying commodities.
(b)Notional amounts for options included on a gross basis but weighted for the probability of exercise.
Consideration of Credit Risk and Concentrations — NSP-Minnesota continuously monitors the creditworthiness of counterparties to its interest rate derivatives and commodity derivative contracts prior to settlement and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. Impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented on the consolidated balance sheets.
NSP-Minnesota’s most significant concentrations of credit risk with particular entities or industries are contracts with counterparties to its wholesale, trading and non-trading commodity activities.
As of March 31, 2024, four of NSP-Minnesota’s ten most significant counterparties for these activities, comprising $23 million, or 21%, of this credit exposure, had investment grade credit ratings from S&P Global Ratings, Moody’s Investor Services or Fitch Ratings.
Three of the ten most significant counterparties, comprising $31 million, or 28%, of this credit exposure, were not rated by these external ratings agencies, but based on NSP-Minnesota’s internal analysis, had credit quality consistent with investment grade.
Three of these significant counterparties, comprising $55 million or 50% of this credit exposure, had credit quality less than investment grade, based on internal analysis.
Five of these significant counterparties are municipal or cooperative electric entities, RTOs or other utilities.
Credit Related Contingent Features — Contract provisions for derivative instruments that NSP-Minnesota enters into, including those accounted for as normal purchase and normal sale contracts and therefore not reflected on the consolidated balance sheets, may require the posting of collateral or settlement of the contracts for various reasons, including if the applicable utility subsidiary’s credit ratings are downgraded below its investment grade credit rating by any of the major credit rating agencies.
As of March 31, 2024 and Dec. 31, 2023, there were $14 million and $12 million, respectively, of derivative liabilities with such underlying contract provisions.
12

Table of Contents
Certain contracts also contain cross default provisions that may require the posting of collateral or settlement of the contracts if there was a failure under other financing arrangements related to payment terms or other covenants.
As of both March 31, 2024 and Dec. 31, 2023, there were approximately $84 million and $80 million, respectively of derivative liabilities with such underlying contract provisions.
Certain derivative instruments are also subject to contract provisions that contain adequate assurance clauses. These provisions allow counterparties to seek performance assurance, including cash collateral, in the event that a given utility subsidiary’s ability to fulfill its contractual obligations is reasonably expected to be impaired. NSP-Minnesota had no collateral posted related to adequate assurance clauses in derivative contracts as of March 31, 2024 and Dec. 31, 2023.
Recurring Derivative Fair Value Measurements
Impact of derivative activity:
Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:
(Millions of Dollars)Accumulated Other Comprehensive LossRegulatory Assets and Liabilities
Three Months Ended March 31, 2024
Derivatives designated as cash flow hedges:
Interest rate$16 $ 
Total$16 $ 
Other derivative instruments:
Electric commodity$ $1 
Natural gas commodity 3 
Total$ $4 
Three Months Ended March 31, 2023
Derivatives designated as cash flow hedges:
Interest rate$(4)

$ 
Total$(4)$ 
Other derivative instruments:
Electric commodity$ $(17)
Natural gas commodity 2 
Total$ $(15)
.
Pre-Tax Losses Reclassified into Income During the Period from:Pre-Tax Gains (Losses) Recognized During the Period in Income
(Millions of Dollars)Regulatory Assets and Liabilities
Three Months Ended March 31, 2024
Other derivative instruments:
Commodity trading$ $1 
(a)
Electric commodity4 
(b)
 
Natural gas commodity (5)
(c)(d)
Total$4 $(4)
Three Months Ended March 31, 2023
Other derivative instruments:
Commodity trading$ $(1)
(a)
Electric commodity14 
(b)
 
Natural gas commodity (5)
(c)(d)
Total$14 $(6)
(a)Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
(b)Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.
(c)Recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
(d)Relates primarily to option premium amortization.
NSP-Minnesota had no derivative instruments designated as fair value hedges during the three months ended March 31, 2024 and 2023.
13

Table of Contents
Derivative assets and liabilities measured at fair value on a recurring basis were as follows:
March 31, 2024Dec. 31, 2023
Fair ValueFair Value Total
Netting (a)
TotalFair ValueFair Value Total
Netting (a)
Total
(Millions of Dollars)Level 1Level 2Level 3Level 1Level 2Level 3
Current derivative assets
Other derivative instruments:
Commodity trading$8 $34 $30 $72 $(43)$29 $7 $32 $32 $71 $(42)$29 
Electric commodity
  9 9 (4)5   23 23 (7)16 
Natural gas commodity       5  5  5 
Total current derivative assets$8 $34 $39 $81 $(47)$34 $7 $37 $55 $99 $(49)$50 
Noncurrent derivative assets
Other derivative instruments:
Commodity trading$7 $47 $51 $105 $(34)$71 $7 $43 $45 $95 $(34)$61 
Total noncurrent derivative assets$7 $47 $51 $105 $(34)$71 $7 $43 $45 $95 $(34)$61 
March 31, 2024Dec. 31, 2023
Fair ValueFair Value Total
Netting (a)
TotalFair ValueFair Value Total
Netting (a)
Total
(Millions of Dollars)Level 1Level 2Level 3Level 1Level 2Level 3
Current derivative liabilities
Derivatives designated as cash flow hedges:
Interest rate$ $ $ $ $ $ $ $7 $ $7 $ $7 
Other derivative instruments:
Commodity trading$7 $64 $5 $76 $(45)$31 $6 $60 $5 $71 $(43)$28 
Electric commodity  4 4 (4)   7 7 (7) 
Natural gas commodity       3  3  3 
Total current derivative liabilities$7 $64 $9 $80 $(49)31 $6 $70 $12 $88 $(50)38 
PPAs (b)
6 6 
Current derivative instruments$37 $44 
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading$11 $51 $42 $104 $(35)$69 $14 $49 $37 $100 $(36)$64 
Total noncurrent derivative liabilities$11 $51 $42 $104 $(35)69 $14 $49 $37 $100 $(36)64 
PPAs (b)
21 22 
Noncurrent derivative instruments$90 $86 
(a)NSP-Minnesota nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At March 31, 2024 and Dec. 31, 2023, derivative assets and liabilities include no obligations to return cash collateral. At both March 31, 2024 and Dec. 31, 2023 derivative assets and liabilities include rights to reclaim cash collateral of $3 million. Counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.
(b)NSP-Minnesota currently applies the normal purchase exception to qualifying PPAs. Balance relates to specific contracts that were previously recognized at fair value prior to applying the normal purchase exception, and are being amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.
14

Table of Contents
Changes in Level 3 commodity derivatives:
Three Months Ended March 31
(Millions of Dollars)20242023
Balance at Jan. 1$51 $107 
Settlements (a)
(15)(13)
Net transactions recorded during the period:
Losses recognized in earnings (b)
 (14)
Net gains (losses) recognized as regulatory assets and liabilities (a)
3 (34)
Balance at March 31$39 $46 
(a)Relates primarily to FTR instruments administered by MISO.
(b)Relates to commodity trading and is subject to substantial offsetting losses and gains on derivative instruments categorized as levels 1 and 2 in the consolidated income statement. See above tables for the income statement impact of derivative activity, including commodity trading gains and losses.
Fair Value of Long-Term Debt
As of March 31, 2024, other financial instruments for which the carrying amount did not equal fair value:
March 31, 2024Dec. 31, 2023
(Millions of Dollars)Carrying AmountFair ValueCarrying AmountFair Value
Long-term debt, including current portion$8,019 $6,993 $7,330 $6,561 
Fair value of NSP-Minnesota’s long-term debt is estimated based on recent trades and observable spreads from benchmark interest rates for similar securities. Fair value estimates are based on information available to management as of March 31, 2024 and Dec. 31, 2023, and given the observability of the inputs, fair values presented for long-term debt were assigned as Level 2.
8. Benefit Plans and Other Postretirement Benefits
Components of Net Periodic Benefit Cost
Three Months Ended March 31
2024202320242023
(Millions of Dollars)Pension BenefitsPostretirement Health
Care Benefits
Service cost$5 $5 $ $ 
Interest cost (a)
9 9 1 1 
Expected return on plan assets (a)
(11)(11)  
Amortization of net loss (a)
3 3   
Net periodic benefit cost6 6 1 1 
Effects of regulation3 1   
Net benefit cost recognized for financial reporting$9 $7 $1 $1 
(a)The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.
In January 2024, contributions totaling $100 million were made across Xcel Energy’s pension plans, of which $41 million was attributable to NSP-Minnesota. Xcel Energy does not expect additional pension contributions during 2024.

9. Commitments and Contingencies
Legal
NSP-Minnesota is involved in various litigation matters in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for losses probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories.
In such cases, there is considerable uncertainty regarding the timing or ultimate resolution, including a possible eventual loss. For current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, would have a material effect on NSP-Minnesota’s consolidated financial statements. Legal fees are generally expensed as incurred.
Rate Matters and Other
NSP-Minnesota is involved in various regulatory proceedings arising in the ordinary course of business. Until resolution, typically in the form of a rate order, uncertainties may exist regarding the ultimate rate treatment for certain activities and transactions. Amounts have been recognized for probable and reasonably estimable losses that may result. Unless otherwise disclosed, any reasonably possible range of loss in excess of any recognized amount is not expected to have a material effect on the consolidated financial statements.
Sherco In 2018, NSP-Minnesota and SMMPA (Co-owner of Sherco Unit 3) reached a settlement with GE related to a 2011 incident, which damaged the turbine at Sherco Unit 3 and resulted in an extended outage for repair. NSP-Minnesota notified the MPUC of its proposal to refund settlement proceeds to customers through the fuel clause adjustment.
In March 2019, the MPUC approved NSP-Minnesota’s settlement refund proposal. Additionally, the MPUC decided to withhold any decision as to NSP-Minnesota’s prudence in connection with the incident at Sherco Unit 3 until after conclusion of an appeal pending between GE and NSP-Minnesota’s insurers. In February 2020, the Minnesota Court of Appeals affirmed the district court’s judgment in favor of GE.
In January 2021, the OAG and DOC recommended that NSP-Minnesota refund approximately $17 million of replacement power costs previously recovered through the FCA. NSP-Minnesota responded that it acted prudently in connection with the Sherco Unit 3 outage, the MPUC has previously disallowed $22 million of related costs and no additional refund or disallowance is appropriate.
In July 2022, the MPUC referred the matter to the Office of Administrative Hearings to conduct a contested case on the prudence of the replacement power costs incurred by NSP-Minnesota. In 2023, NSP-Minnesota and various parties filed recommendations, including the DOC which recommended a $56 million customer refund. The Xcel Large Industrial customer group recommended a refund of $72 million. A final decision by the MPUC is expected in mid-2024. A loss related to this matter is deemed remote.
15

Table of Contents
Environmental
New and changing federal and state environmental mandates can create financial liabilities for NSP-Minnesota, which are normally recovered through the regulated rate process.
Site Remediation
Various federal and state environmental laws impose liability where hazardous substances or other regulated materials have been released to the environment. NSP-Minnesota may sometimes pay all or a portion of the cost to remediate sites where past activities of their predecessors or other parties have caused environmental contamination.
Environmental contingencies could arise from various situations, including sites of former MGPs; and third-party sites, such as landfills, for which NSP-Minnesota is alleged to have sent wastes to that site.
MGP, Landfill and Disposal Sites
NSP-Minnesota is investigating, remediating or performing post-closure actions at seven MGP, landfill or other disposal sites across its service territories.
NSP-Minnesota has recognized approximately $1 million of costs/liabilities from final resolution of these issues, however, the outcome and timing are unknown. In addition, there may be regulatory recovery, insurance recovery and/or recovery from other potentially responsible parties, offsetting a portion of costs incurred.
Environmental Requirements — Water and Waste
Coal Ash Regulation NSP-Minnesota’s operations are subject to federal and state regulations that impose requirements for handling, storage, treatment and disposal of solid waste, including the CCR Rule. As a specific requirement of the CCR Rule, utilities must complete groundwater sampling around their applicable landfills and surface impoundments as well as perform corrective actions where offsite groundwater has been impacted.
If certain impacts to groundwater are detected, utilities are required to perform additional groundwater investigations and/or perform corrective actions beginning with an Assessment of Corrective Measures.
NSP-Minnesota is conducting groundwater sampling and monitoring and implementing assessment of corrective measures at certain CCR landfills and surface impoundments. No results above the groundwater protection standards in the rule were identified.
Federal Clean Water Act Section 316(b) — The Federal Clean Water Act requires the EPA to regulate cooling water intake structures to assure they reflect the best technology available for minimizing impingement and entrainment of aquatic species.
NSP-Minnesota estimates capital expenditures of approximately $45 million may be required to comply with the requirements. NSP-Minnesota anticipates these costs will be recoverable through regulatory mechanisms.

Environmental Requirements — Air
Clean Air Act NOx Allowance Allocations — In June 2023, the EPA published final regulations for ozone under the “Good Neighbor” provisions of the Clean Air Act. The final rule applies to generation facilities in Minnesota, as well as other states outside of our service territory. The rule establishes an allowance trading program for NOx that will impact NSP-Minnesota fossil fuel-fired electric generating facilities. Subject facilities will have to secure additional allowances, install NOx controls and/or develop a strategy of operations that utilizes the existing allowance allocations. Guidelines are also established for allowance banking and emission limit backstops.
While the financial impacts of the final rule are uncertain and dependent on market forces and anticipated generation, NSP-Minnesota anticipates the annual costs could be significant, but would be recoverable through regulatory mechanisms.
NSP-Minnesota has joined other companies in litigation challenging the EPA’s disapproval of Minnesota’s state implementation plan. Currently, the regulation is under a judicial stay for Minnesota. The regulation may become applicable in the future, depending on the outcome of the litigation.
Leases
NSP-Minnesota evaluates contracts that may contain leases, including PPAs and arrangements for the use of office space and other facilities, vehicles and equipment. A contract contains a lease if it conveys the exclusive right to control the use of a specific asset.
Components of lease expense:
Three Months Ended March 31
(Millions of Dollars)20242023
Operating leases
PPA capacity payments$23 $25 
Other operating leases (a)
54
Total operating lease expense (b)
$28 $29 
(a)Includes immaterial short-term lease expense for both 2024 and 2023.
(b)PPA capacity payments are included in electric fuel and purchased power on the consolidated statements of income. Expense for other operating leases is included in O&M expense and electric fuel and purchased power.
Commitments under operating leases as of March 31, 2024:
(Millions of Dollars)PPA Operating
Leases
Other Operating
Leases
Total
Operating
Leases
Total minimum obligation$377 $174 $551 
Interest component of obligation(32)(79)(111)
Present value of minimum obligation$345 $95 440 
Less current portion(93)
Noncurrent operating lease liabilities$347 

16

Table of Contents
Variable Interest Entities
Under certain PPAs, NSP-Minnesota purchases power from IPPs for which NSP-Minnesota is required to reimburse fuel costs, or to participate in tolling arrangements under which NSP-Minnesota procures the natural gas required to produce the energy that it purchases. NSP-Minnesota has determined that certain IPPs are VIEs, however NSP-Minnesota is not subject to risk of loss from the operations of these entities, and no significant financial support is required other than contractual payments for energy and capacity.

NSP-Minnesota evaluated each of these VIEs for possible consolidation, including review of qualitative factors such as the length and terms of the contract, control over O&M, control over dispatch of electricity, historical and estimated future fuel and electricity prices and financing activities. NSP-Minnesota concluded that these entities are not required to be consolidated in its consolidated financial statements because NSP-Minnesota does not have the power to direct the activities that most significantly impact the entities’ economic performance.
NSP-Minnesota had approximately 1,347 MW of capacity under long-term PPAs at both March 31, 2024 and Dec. 31, 2023, with entities that have been determined to be VIEs. These agreements have expiration dates through 2039.
10. Other Comprehensive Loss
Changes in accumulated other comprehensive loss, net of tax:
Three Months Ended March 31, 2024Three Months Ended March 31, 2023
(Millions of Dollars)Gains and Losses on Cash Flow HedgesDefined Benefit Pension and Postretirement ItemsTotalGains and Losses on Cash Flow HedgesDefined Benefit Pension and Postretirement ItemsTotal
Accumulated other comprehensive loss at Jan. 1$(18)$(2)$(20)$(16)$(2)$(18)
Gains reclassified from net accumulated other comprehensive income:
Other comprehensive gain before reclassifications
12  12    
Losses reclassified from net accumulated other comprehensive loss:
Interest rate derivatives (a)
   (3) (3)
Net current period other comprehensive income (loss)12  12 (3) (3)
Accumulated other comprehensive loss at March 31$(6)$(2)$(8)$(19)$(2)$(21)
(a)Included in interest charges.
11. Segment Information
NSP-Minnesota evaluates performance based on profit or loss generated from the product or service provided. These segments are managed separately because the revenue streams are dependent upon regulated rate recovery, which is separately determined for each segment.
NSP-Minnesota has the following reportable segments:
Regulated Electric — The regulated electric utility segment generates electricity which is transmitted and distributed in Minnesota, North Dakota and South Dakota. In addition, this segment includes sales for resale and provides wholesale transmission service to various entities in the United States. The regulated electric utility segment also includes NSP-Minnesota’s wholesale commodity and trading operations.
Regulated Natural Gas — The regulated natural gas utility segment transports, stores and distributes natural gas in portions of Minnesota and North Dakota.

NSP-Minnesota also presents All Other, which includes operating segments with revenues below the necessary quantitative thresholds. Those operating segments primarily include appliance repair, non-utility real estate activities and revenues associated with processing solid waste into refuse-derived fuel.
Asset and capital expenditure information is not provided for NSP-Minnesota’s reportable segments. As an integrated electric and natural gas utility, NSP-Minnesota operates significant assets that are not dedicated to a specific business segment. Reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations, which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis.
Certain costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators across each segment. In addition, a general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.
17

Table of Contents
NSP-Minnesota’s segment information:
Three Months Ended March 31
(Millions of Dollars)20242023
Regulated Electric
Total revenues (a)
$1,255 $1,256 
Net income145 111 
Regulated Natural Gas
Operating revenues (b)
$273 $400 
 Intersegment revenue1 1 
Total revenues$274 $401 
Net income51 30 
All Other
Total revenues$8 $10 
Net income (loss)15 (2)
Consolidated Total
Operating revenues (a)(b)
$1,537 $1,667 
Reconciling eliminations(1)(1)
Total operating revenues$1,536 $1,666 
Net income211 139 
(a)Operating revenues include $122 million and $125 million of affiliate electric revenue for the three months ended March 31, 2024 and 2023.
(b)Operating revenues include an immaterial amount of affiliate gas revenue for the three months ended March 31, 2024 and 2023.
ITEM 2 — MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Discussion of financial condition and liquidity for NSP-Minnesota is omitted per conditions set forth in General Instructions H(1)(a) and (b) of Form 10-Q for wholly owned subsidiaries. It is replaced with management’s narrative analysis of the results of operations set forth in General Instruction H(2)(a) of Form 10-Q for wholly owned subsidiaries (reduced disclosure format).
Non-GAAP Financial Measures
The following discussion includes financial information prepared in accordance with GAAP, as well as certain non-GAAP financial measures such as ongoing earnings. Generally, a non-GAAP financial measure is a measure of a company’s financial performance, financial position or cash flows that adjusts measures calculated and presented in accordance with GAAP.
NSP-Minnesota’s management uses non-GAAP measures for financial planning and analysis, for reporting of results to the Board of Directors, in determining performance-based compensation, and communicating its earnings outlook to analysts and investors. Non-GAAP financial measures are intended to supplement investors’ understanding of our performance and should not be considered alternatives for financial measures presented in accordance with GAAP. These measures are discussed in more detail below and may not be comparable to other companies’ similarly titled non-GAAP financial measures.
Results of Operations
NSP-Minnesota’s net income was $211 million for the three months ended March 31, 2024 compared with $139 million for the prior year. The change was driven by increased recovery of electric and natural gas infrastructure investments and lower O&M expenses, partially offset by higher interest expenses and depreciation.
Electric Revenue
Electric revenues are impacted by fluctuations in the price of natural gas, coal and uranium, regulatory outcomes, market prices and seasonality. In addition, electric customers receive a credit for PTCs generated, which reduce electric revenue and income taxes. In the first quarter, electric revenues decreased $1 million.
(Millions of Dollars)Three Months Ended March 30, 2024 vs. 2023
Recovery of lower electric fuel and purchased power expenses$(46)
PTCs flowed back to customers(6)
Interchange agreement revenue from NSP-Wisconsin(3)
Regulatory rate outcomes28 
Conservation and demand side management 18 
Non-fuel riders14 
Sales and demand (a)
Other (net) (14)
Total decrease$(1)
(a)Sales excludes weather impact, net of sales true-up mechanism in Minnesota.
Natural Gas Revenues
Natural gas revenues vary with changing sales, the cost of natural gas and regulatory outcomes. In the first quarter, natural gas revenues decreased $127 million for the first quarter.
(Millions of Dollars)Three Months Ended March 30, 2024 vs. 2023
Recovery of lower natural gas costs (sold and transported)$(158)
Regulatory rate outcomes 20 
Infrastructure and integrity riders
Estimated impact of weather (net of decoupling)
Retail sales growth (net of decoupling)
Other (net)
Total $(127)
Electric Fuel and Purchased Power — Expenses incurred for electric fuel and purchased power are impacted by fluctuations in market prices of natural gas, coal and uranium, as well as seasonality. However, these incurred expenses are generally recovered through various regulatory recovery mechanisms. As a result, changes in these expenses are generally offset in operating revenues and have minimal earnings impact.
Electric fuel and purchased power expenses decreased $46 million for the first quarter of 2024. The decrease is primarily due to decreased volumes and timing of fuel recovery, partially offset by higher commodity prices.
Cost of Natural Gas Sold and Transported — Expenses incurred for the cost of natural gas sold are impacted by market prices and seasonality. These costs are generally recovered through various regulatory recovery mechanisms. As a result, changes in these expenses are generally offset in operating revenues and have minimal earnings impact.
Natural gas sold and transported decreased $158 million for the first quarter of 2024. The decrease is primarily due to timing of fuel recovery, lower commodity prices and volumes.
Non-Fuel Operating Expenses and Other Items
O&M Expenses — O&M expenses decreased $30 million for the first quarter. The decrease was primarily due to decreased labor and benefit costs, gain on the sale of land and lower bad debt expenses.
18

Table of Contents
Depreciation and Amortization Depreciation and amortization expense increased $6 million for the first quarter as a result of system expansion offset by depreciation life extensions implemented in the Minnesota Electric Rate Case.
Interest Charges — Interest charges increased $11 million year-to-date, largely due to increased long-term debt levels and higher interest rates to fund capital investments.
Public Utility Regulation and Other
The FERC and various state and local regulatory commissions regulate NSP-Minnesota. NSP-Minnesota is subject to rate regulation by state utility regulatory agencies, which have jurisdiction with respect to the rates of electric and natural gas distribution companies in Minnesota, North Dakota and South Dakota.
Rates are designed to recover plant investment, operating costs and an allowed return on investment. NSP-Minnesota requests changes in utility rates through commission filings. Changes in operating costs can affect NSP-Minnesota’s financial results, depending on the timing of rate cases and implementation of final rates. Other factors affecting rate filings are new investments, sales, conservation and demand side management efforts, and the cost of capital.
In addition, the regulatory commissions authorize the ROE, capital structure and depreciation rates in rate proceedings. Decisions by these regulators can significantly impact NSP-Minnesota’s results of operations.
Except to the extent noted below, the circumstances set forth in Public Utility Regulation included in Item 7 of NSP-Minnesota’s Annual Report on Form 10-K for the year ended Dec. 31, 2023 appropriately represent, in all material respects, the current status of public utility regulation and are incorporated herein by reference.
Pending and Recently Concluded Regulatory Proceedings
2024 Minnesota Natural Gas Rate Case — In November 2023, NSP-Minnesota filed a request with the MPUC for an annual natural gas rate increase of approximately $59 million, or 9.6%. The request is based on a ROE of 10.2%, a 52.5% equity ratio and a 2024 forward test year with rate base of approximately $1.27 billion. In December 2023, the MPUC approved NSP-Minnesota’s request for interim rates, subject to refund, of approximately $51 million (implemented on Jan. 1, 2024).
On April 19, 2024, four parties filed direct testimony. The DOC, OAG, and CUB were the only parties to quantify recommended financial adjustments. The OAG and CUB provided limited comments, recommending a reduction of approximately $1 million of O&M expenses each. The CUB additionally recommended a reduction to ROE.
Proposed DOC modifications to NSP-Minnesota’s request were as follows:
(Millions of Dollars)
NSP-Minnesota’s filed base revenue request$59 
Recommended adjustments:
Rate of return(7)
Operating & maintenance expenses(4)
Plant investments(3)
Other, net(2)
Total adjustments$(16)
Total proposed revenue change$43 
Positions on NSP-Minnesota’s filed rate request were as follows:
Recommended PositionDOCCUB
ROE9.40 %9.00-9.40%
Equity ratio 52.50 %N/A
Procedural schedule:
Mediation: May 17, 2024 (day subject to availability)
Rebuttal testimony: May 24, 2024
Evidentiary hearings: July 10-12, 2024
ALJ report: October 28, 2024
MPUC Order Due: March 14, 2025
2024 North Dakota Natural Gas Rate Case — In December 2023, NSP-Minnesota filed a request with the NDPSC seeking an increase in natural gas rates of $8.5 million (9.4%), a 2024 test year, ROE of 10.20%, an equity ratio of 52.5% and rate base of $168 million. In February 2024, the NDPSC approved interim rates of $8 million, effective March 1, 2024.
Minnesota 2023 Fuel Clause Adjustment — In March 2024, NSP-Minnesota submitted an annual fuel clause adjustment true-up petition to the MPUC, with a requested refund of $126 million for fuel over-recoveries in 2023. In April 2024, the DOC recommended the MPUC approve the non-nuclear aspects of the petition. The DOC stated it intends to submit supplemental comments in the second quarter of 2024 with recommendations related to costs associated with operation of NSP-Minnesota’s nuclear units, which includes costs associated with an outage at the Prairie Island generating station.
NSP System
2022 Upper Midwest IRP Resource Acquisition — Following the MPUC’s approval of NSP-Minnesota and NSP-Wisconsin’s latest IRP in April 2022, NSP-Minnesota and NSP-Wisconsin have been engaged in multiple resource acquisition processes and proceedings to meet the need identified in the IRP.
In the second quarter of 2023, NSP-Minnesota initiated the process with the MPUC for acquisition of 800 MW of firm dispatchable resources. In January 2024, NSP-Minnesota and other companies submitted proposed resources and filed for project approval with the MPUC. NSP-Minnesota expects a decision by the second quarter of 2025.
In July 2023, NSP-Wisconsin issued an RFP seeking approximately 650 MW of solar and/or solar plus storage development assets that will be developed in the 2027-2029 timeframe to replace the capacity from the retiring King Generating Station. The RFP closed in September 2023 and bids are being evaluated.
In October 2023, NSP-Minnesota issued an RFP seeking approximately 1,200 MW of wind development assets to replace capacity and reutilize interconnection rights associated with the retiring Sherco coal facilities. The RFP closed in December 2023 and NSP-Minnesota expects to file for approval of recommended projects by mid-2024.
19

Table of Contents
2024 Upper Midwest Resource Plan — In February 2024, NSP filed its Upper Midwest Resource Plan with the MPUC which included the following key items:
Reduced carbon emissions by more than 80%, potentially up to 88%, by 2030.
Extends the operation of Prairie Island and Monticello through the early 2050s.
Adds 3,600 MWs of new wind and solar resources by 2030.
Adds 600 MWs of battery energy storage by 2030.
Adds more than 2,200 MWs of dispatchable resources by 2030.
These proposed resources are in addition to projects already approved by the MPUC. NSP-Minnesota anticipates a MPUC decision in 2025.
Nuclear Power Operations
NSP-Minnesota owns two nuclear generating plants: the Monticello plant and the Prairie Island plant. See Note 10 to the consolidated financial statements of NSP-Minnesota’s Annual Report on Form 10-K for the year ended Dec. 31, 2023 for further information. The circumstances set forth in Nuclear Power Operations included in Item 7 of NSP-Minnesota’s Annual Report on Form 10-K for the year ended Dec. 31, 2023, appropriately represent, in all material respects, the current status of nuclear power operations.
Other
Supply Chain
NSP-Minnesota’s ability to meet customer energy requirements, respond to storm-related disruptions and execute our capital expenditure program are dependent on maintaining an efficient supply chain. Manufacturing processes have experienced disruptions related to scarcity of certain raw materials and interruptions in production and shipping. These disruptions have been further exacerbated by inflationary pressures, labor shortages and the impact of international conflicts/issues. NSP-Minnesota continues to monitor the situation as it remains fluid and seeks to mitigate the impacts by securing alternative suppliers, modifying design standards, and adjusting the timing of work.
Solar Resources
In August 2023, the U.S. Department of Commerce completed its anti-circumvention investigation and concluded that CSPV solar panels and cells imported from Malaysia, Vietnam, Thailand, and Cambodia would be subject to incremental tariffs ranging from 50% to 250%. These countries account for more than 80% of CSPV panel imports.
An interim stay on tariffs remains in effect until June 2024 and many significant solar projects have resumed with modified costs and projected in-service dates, including the Sherco Solar facility. Further policy action, a change in the interim stay of tariffs, or other restrictions on solar imports (e.g., as a result of implementation of the Uyghur Forced Labor Protection Act), disruptions in solar imports from key suppliers or any new trade complaint could impact project timelines and costs.
On April 24, 2024, the American Alliance for Solar Manufacturing Trade Committee filed a petition related to new anti-dumping and countervailing duty cases targeting solar products from Cambodia, Malaysia, Thailand and Vietnam with the United States Department of Commerce and the United States International Trade Commission. NSP-Minnesota continues to assess the impacts (if any) of this trade complaint on its business.

Emerging Environmental Regulation
Clean Air Act
Power Plant Greenhouse Gas Regulations In April 2024, the EPA published final rules addressing control of CO2 emissions from the power sector. The rules regulate new natural gas generating units and emission guidelines for existing coal and certain natural gas generation. The rules create subcategories of coal units based on planned retirement date and subcategories of natural gas combustion turbines and combined cycle units based on utilization. The CO2 control requirements vary by subcategory. NSP-Minnesota continues to evaluate the impact of these rules and believes that the cost of these initiatives or replacement generation would be recoverable through rates based on prior state commission practices.
Coal Ash Regulation
In April 2024, the EPA published final rules to regulate additional areas under the CCR Rule for the first time, including legacy CCR surface impoundments at inactive facilities and previously exempt areas where CCR was placed directly on land at regulated CCR facilities. The rule subjects these areas to groundwater monitoring, corrective action and closure and post-closure care requirements, among other requirements, with several of the deadlines accelerated. NSP-Minnesota believes that the cost of these requirements would be recoverable through rates based on prior state commission practices.
Emerging Contaminants of Concern
PFAS are man-made chemicals that are widely used in consumer products and can persist and bio-accumulate in the environment. NSP-Minnesota does not manufacture PFAS but because PFAS are so ubiquitous in products and the environment, it may impact our operations.
In September 2022, the EPA proposed to designate two types of PFAS as “hazardous substances” under the CERCLA.
In March 2023, the EPA published a proposed rule that would establish enforceable drinking water standards for certain PFAS chemicals.
In February 2024, the EPA proposed to change the Resource Conservation and Recovery Act by adding nine PFAS to its list of hazardous constituents.
Final rules for all three proposals are expected in 2024 which could result in new obligations. Potential costs are uncertain until final rules are published and/or agency action is taken.
Effluent Limitation Guidelines
In April 2024, the EPA published final rules under the Clean Water Act, setting forth Effluent Limitations Guidelines and Standards for steam generating coal plants. This rule establishes more stringent wastewater discharge standards for bottom ash transport water, flue-gas desulfurization wastewater, and combustion residuals leachate from steam electric power plants, particularly coal-fired power plants. NSP-Minnesota continues to evaluate the impact of these rules and believes that any costs associated with these requirements would be recoverable through rates based on prior state commission practices.
20

Table of Contents
Nuclear Fuel Supply
NSP-Minnesota is scheduled to take delivery of approximately 29% of its average enriched nuclear material requirements from Russia through 2030. Given the evolving situation in Ukraine and its global impacts, we have entered into additional contracts that cover potential supply interruptions of nuclear material from Russia. With these contracts, NSP-Minnesota has secured its enriched nuclear material requirements through 2028 with non-Russian material, which are in various stages of processing in Canada, Europe and the United States.
ITEM 4 CONTROLS AND PROCEDURES
Disclosure Controls and Procedures
NSP-Minnesota maintains a set of disclosure controls and procedures designed to ensure that information required to be disclosed in reports that it files or submits under the Securities Exchange Act of 1934 is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms.
In addition, the disclosure controls and procedures ensure that information required to be disclosed is accumulated and communicated to management, including the CEO and CFO, allowing timely decisions regarding required disclosure.
As of March 31, 2024, based on an evaluation carried out under the supervision and with the participation of NSP-Minnesota’s management, including the CEO and CFO, of the effectiveness of its disclosure controls and procedures, the CEO and CFO have concluded that NSP-Minnesota’s disclosure controls and procedures were effective.
Internal Control Over Financial Reporting
No changes in NSP-Minnesota’s internal control over financial reporting occurred during the most recent fiscal quarter that materially affected, or are reasonably likely to materially affect, NSP-Minnesota’s internal control over financial reporting.
PART IIOTHER INFORMATION
ITEM 1 — LEGAL PROCEEDINGS
NSP-Minnesota is involved in various litigation matters in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for losses probable of being incurred and subject to reasonable estimation.
Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss.
For current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, would have a material effect on NSP-Minnesota’s consolidated financial statements. Legal fees are generally expensed as incurred.
See Note 9 to the consolidated financial statements and Part I Item 2 for further information.
ITEM 1A — RISK FACTORS
NSP-Minnesota’s risk factors are documented in Item 1A of Part I of its Annual Report on Form 10-K for the year ended Dec. 31, 2023, which is incorporated herein by reference. There have been no material changes from the risk factors previously disclosed in the Form 10-K.
ITEM 5 — OTHER INFORMATION
None of the Company’s directors or officers adopted, modified, or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement during the Company’s fiscal quarter ended March 31, 2024.
ITEM 6 — EXHIBITS
* Indicates incorporation by reference
Exhibit NumberDescriptionReport or Registration StatementExhibit Reference
NSP-Minnesota Form 10-12G dated Oct. 5, 20003.01
NSP-Minnesota Form 10-K for the year ended Dec. 31, 20183.02
NSP-Minnesota Form 8-K dated February 29, 20244.01
101.INSInline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCHInline XBRL Schema
101.CALInline XBRL Calculation
101.DEFInline XBRL Definition
101.LABInline XBRL Label
101.PREInline XBRL Presentation
104Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)
21

Table of Contents
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
Northern States Power Company (a Minnesota corporation)
4/25/2024By:/s/ MELISSA L. OSTROM
Melissa L. Ostrom
Vice President, Controller
(Principal Accounting Officer)
By:/s/ BRIAN J. VAN ABEL
Brian J. Van Abel
Executive Vice President, Chief Financial Officer
(Principal Financial Officer)
22