xbrli:pure iso4217:USD utr:dth iso4217:USD utr:dth utr:MW utr:mi C001088 2025-01-01 2025-12-31 C001088 MW_PipelineSystem_3_21_2025.PDF 2025-01-01 2025-12-31 C001088 ferc:SingleDayPeakDeliveriesMember 2025-01-01 2025-12-31 C001088 ferc:ThreeDayPeakDeliveriesMember 2025-01-01 2025-12-31 C001088 ScheduleSecurityHoldersAndVotingPowersAbstract 2025-01-01 2025-12-31 C001088 ScheduleStatementOfAccumulatedOtherComprehensiveIncomeAndHedgingActivitiesAbstract 2025-01-01 2025-12-31 C001088 ScheduleGasPropertyAndCapacityLeasedFromOthersAbstract 2025-01-01 2025-12-31 C001088 ScheduleGasPropertyAndCapacityLeasedToOthersAbstract 2025-01-01 2025-12-31 C001088 ScheduleGasPlantHeldForFutureUseAbstract 2025-01-01 2025-12-31 C001088 ScheduleInvestmentsAbstract 2025-01-01 2025-12-31 C001088 ScheduleExtraordinaryPropertyLossesAbstract 2025-01-01 2025-12-31 C001088 ScheduleUnrecoveredPlantAndRegulatoryStudyCostsAbstract 2025-01-01 2025-12-31 C001088 ScheduleCapitalStockAbstract 2025-01-01 2025-12-31 C001088 ScheduleCapitalStockSubscribedLiabilityForConversionPremiumOnAndInstallmentsReceivedOnAbstract 2025-01-01 2025-12-31 C001088 ScheduleDiscountOnCapitalStockAbstract 2025-01-01 2025-12-31 C001088 ScheduleCapitalStockExpenseAbstract 2025-01-01 2025-12-31 C001088 ScheduleSecuritiesIssuedOrAssumedAndSecuritiesRefundedOrRetiredDuringTheYearAbstract 2025-01-01 2025-12-31 C001088 ScheduleUnamortizedLossAndGainOnReacquiredDebtAbstract 2025-01-01 2025-12-31 C001088 ScheduleRevenuesFromTransporationOfGasOfOthersThroughGatheringFacilitiesAbstract 2025-01-01 2025-12-31 C001088 MountainWest Pipelines Holding LLC 2025-01-01 2025-12-31 C001088 The Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 MountainWest Pipelines Holding LLC 2025-12-31 C001088 MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 White River Hub, LLC 2025-01-01 2025-12-31 C001088 MountainWest Field Services, LLC 2025-01-01 2025-12-31 C001088 MountainWest White River Hub, LLC 2025-01-01 2025-12-31 C001088 MountainWest Overthrust Pipeline, LLC 2025-12-31 C001088 White River Hub, LLC 2025-12-31 C001088 MountainWest Field Services, LLC 2025-12-31 C001088 MountainWest White River Hub, LLC 2025-12-31 C001088 2025-12-31 C001088 2024-12-31 C001088 2024-01-01 2024-12-31 C001088 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember 2024-01-01 2024-12-31 C001088 2023-12-31 C001088 TOTAL Credits to Retained Earnings (Account 439) (footnote details) 2025-01-01 2025-12-31 C001088 TOTAL Debits to Retained Earnings (Account 439) (footnote details) 2025-01-01 2025-12-31 C001088 TOTAL Appropriations of Retained Earnings (Account 436) (footnote details) 2025-01-01 2025-12-31 C001088 TOTAL Dividends Declared-Preferred Stock (Account 437) (footnote details) 2025-01-01 2025-12-31 C001088 TOTAL Dividends Declared-Common Stook (Account 438) (footnote details) 2025-01-01 2025-12-31 C001088 Cash Distribution 2025-01-01 2025-12-31 C001088 Income Tax Distribution 2025-01-01 2025-12-31 C001088 Other Changes (Explain) 2025-01-01 2025-12-31 C001088 Amortization of (Specify) (footnote details) 2025-01-01 2025-12-31 C001088 Amortization Expense - Utility Plant 2025-01-01 2025-12-31 C001088 Amortization of Regulatory Asset - Cash Flow Hedge Deferrals 2025-01-01 2025-12-31 C001088 Amortization of Debt Expense 2025-01-01 2025-12-31 C001088 Amortization of Discount on Long Term Debt 2025-01-01 2025-12-31 C001088 Amortization Expense - Utility Plant 2024-01-01 2024-12-31 C001088 Amortization of Regulatory Asset - Cash Flow Hedge Deferrals 2024-01-01 2024-12-31 C001088 Amortization of Debt Expense 2024-01-01 2024-12-31 C001088 Amortization of Discount on Long Term Debt 2024-01-01 2024-12-31 C001088 Other (footnote details): 2025-01-01 2025-12-31 C001088 Net (Gain) or Loss on Sale of Assets 2025-01-01 2025-12-31 C001088 Accretion 2025-01-01 2025-12-31 C001088 Gas Stored - Base Gas 2025-01-01 2025-12-31 C001088 System Balancing Gas 2025-01-01 2025-12-31 C001088 Gas Owed to System Gas 2025-01-01 2025-12-31 C001088 Special Deposits 2025-01-01 2025-12-31 C001088 Prepayments 2025-01-01 2025-12-31 C001088 Gas Imbalances 2025-01-01 2025-12-31 C001088 Miscellaneous Deferred Debits 2025-01-01 2025-12-31 C001088 Customer Deposits 2025-01-01 2025-12-31 C001088 Other Deferred Credits 2025-01-01 2025-12-31 C001088 Net Transportation and Exchange Receivable/Payable Imbalance 2025-01-01 2025-12-31 C001088 Clearing Account 2025-01-01 2025-12-31 C001088 OBA cashout settlement 2025-01-01 2025-12-31 C001088 Preliminary Survey and Investigation Charges (Gas) 2025-01-01 2025-12-31 C001088 Accretion 2024-01-01 2024-12-31 C001088 Gas Owed to System Gas 2024-01-01 2024-12-31 C001088 Special Deposits 2024-01-01 2024-12-31 C001088 Prepayments 2024-01-01 2024-12-31 C001088 Miscellaneous Deferred Debits 2024-01-01 2024-12-31 C001088 Customer Deposits 2024-01-01 2024-12-31 C001088 Other Deferred Credits 2024-01-01 2024-12-31 C001088 Net Transportation and Exchange Receivable/Payable Imbalance 2024-01-01 2024-12-31 C001088 Clearing Account 2024-01-01 2024-12-31 C001088 OBA cashout settlement 2024-01-01 2024-12-31 C001088 Other (footnote details): 2025-01-01 2025-12-31 C001088 Net Retirements 2025-01-01 2025-12-31 C001088 Net Retirements 2024-01-01 2024-12-31 C001088 Other (footnote details): 2025-01-01 2025-12-31 C001088 Contributions and Advances for Construction Costs 2025-01-01 2025-12-31 C001088 Contributions and Advances for Construction Costs 2024-01-01 2024-12-31 C001088 Other (footnote details): 2025-01-01 2025-12-31 C001088 Other (footnote details): 2025-01-01 2025-12-31 C001088 Distribution to Willimas 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember 2025-12-31 C001088 CMP - 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Rehabilitation/Remediation ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 PIP - Rehabilitation/Remediation 2025-01-01 2025-12-31 C001088 Plant - Station Piping ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Plant - Station Piping 2025-01-01 2025-12-31 C001088 Reimbursable Projects ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Reimbursable Projects 2025-01-01 2025-12-31 C001088 STO - Clay Basin ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 STO - Clay Basin 2025-01-01 2025-12-31 C001088 TRB - Non-Emergency ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 TRB - Non-Emergency 2025-01-01 2025-12-31 C001088 Uinta Wax Receipt ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Uinta Wax Receipt 2025-01-01 2025-12-31 C001088 Minor Projects ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Minor Projects 2025-01-01 2025-12-31 C001088 CMP - Buildings / Foundations /Utilities ferc:GasUtilityMember 2025-12-31 C001088 CMP - Other ferc:GasUtilityMember 2025-12-31 C001088 IMP - IMP Rehabilitation/Remediation ferc:GasUtilityMember 2025-12-31 C001088 MAOP - Integrity/Material Dig ferc:GasUtilityMember 2025-12-31 C001088 MW IT Transition Prog ferc:GasUtilityMember 2025-12-31 C001088 Reimbursable Projects ferc:GasUtilityMember 2025-12-31 C001088 STO - Clay Basin ferc:GasUtilityMember 2025-12-31 C001088 TRB - Non-Emergency ferc:GasUtilityMember 2025-12-31 C001088 Uinta Wax Receipt ferc:GasUtilityMember 2025-12-31 C001088 Minor Projects ferc:GasUtilityMember 2025-12-31 C001088 CMP - Station Piping ferc:GasUtilityMember 2025-12-31 C001088 Fleet Program ferc:GasUtilityMember 2025-12-31 C001088 Kastler Replacement ferc:GasUtilityMember 2025-12-31 C001088 PIP - Rehabilitation/Remediation ferc:GasUtilityMember 2025-12-31 C001088 Plant - Station Piping ferc:GasUtilityMember 2025-12-31 C001088 EAKIN COMPRESSOR UNIT #7, See Footnote, AT RISK 2025-01-01 2025-12-31 C001088 FIDLAR COMPRESSOR UNIT #3, See Footnote, AT RISK 2025-01-01 2025-12-31 C001088 ML 101, CP96-820, AT RISK 2025-01-01 2025-12-31 C001088 ML 104, CP00-68, AT RISK 2025-01-01 2025-12-31 C001088 OAK SPRING COMPRESSOR, CP98-66, AT RISK 2025-01-01 2025-12-31 C001088 ML 104 SOUTHERN SYSTEM EXPANSION, See Footnote, INCREMENTAL 2025-01-01 2025-12-31 C001088 EAKIN COMPRESSOR UNIT #7, See Footnote, AT RISK 2025-12-31 C001088 FIDLAR COMPRESSOR UNIT #3, See Footnote, AT RISK 2025-12-31 C001088 ML 101, CP96-820, AT RISK 2025-12-31 C001088 ML 104, CP00-68, AT RISK 2025-12-31 C001088 OAK SPRING COMPRESSOR, CP98-66, AT RISK 2025-12-31 C001088 ML 104 SOUTHERN SYSTEM EXPANSION, See Footnote, INCREMENTAL 2025-12-31 C001088 ferc:GasUtilityMember 2024-12-31 C001088 ferc:GasUtilityMember ferc:GasPlantInServiceMember 2024-12-31 C001088 ferc:GasUtilityMember ferc:GasPlantInServiceMember 2025-01-01 2025-12-31 C001088 Other Clearing (Specify) (footnote details): 2025-01-01 2025-12-31 C001088 ARO Settlement Out of Retirement Work in Progress Account 2025-01-01 2025-12-31 C001088 Allocation of Furniture and Equipment Depreciation to Capital 2025-01-01 2025-12-31 C001088 Other Debit or Credit Items 2025-01-01 2025-12-31 C001088 Other Debit or Credit Items ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Other Debit or Credit Items ferc:GasUtilityMember ferc:GasPlantInServiceMember 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember ferc:GasPlantInServiceMember 2025-12-31 C001088 MountainWest Overthrust Pipeline, LLC (MWOT) ferc:UnspecifiedInvestmentsInSubsidiaryCompaniesOneMember 2025-01-01 2025-12-31 C001088 MountainWest Overthrust Pipeline, LLC - Advance Fixed Rate Note ferc:AdvancesNoteMember 2025-01-01 2025-12-31 C001088 MountainWest Field Services, LLC (MWFS) ferc:UnspecifiedInvestmentsInSubsidiaryCompaniesTwoMember 2025-01-01 2025-12-31 C001088 MountainWest White River Hub, LLC (MWWRH) ferc:UnspecifiedInvestmentsInSubsidiaryCompaniesThreeMember 2025-01-01 2025-12-31 C001088 MountainWest Overthrust Pipeline, LLC (MWOT) ferc:UnspecifiedInvestmentsInSubsidiaryCompaniesOneMember 2024-12-31 C001088 MountainWest Overthrust Pipeline, LLC - Advance Fixed Rate Note ferc:AdvancesNoteMember 2024-12-31 C001088 MountainWest Field Services, LLC (MWFS) ferc:UnspecifiedInvestmentsInSubsidiaryCompaniesTwoMember 2024-12-31 C001088 MountainWest White River Hub, LLC (MWWRH) ferc:UnspecifiedInvestmentsInSubsidiaryCompaniesThreeMember 2024-12-31 C001088 MountainWest Overthrust Pipeline, LLC (MWOT) ferc:UnspecifiedInvestmentsInSubsidiaryCompaniesOneMember 2025-12-31 C001088 MountainWest Overthrust Pipeline, LLC - Advance Fixed Rate Note ferc:AdvancesNoteMember 2025-12-31 C001088 MountainWest Field Services, LLC (MWFS) ferc:UnspecifiedInvestmentsInSubsidiaryCompaniesTwoMember 2025-12-31 C001088 MountainWest White River Hub, LLC (MWWRH) ferc:UnspecifiedInvestmentsInSubsidiaryCompaniesThreeMember 2025-12-31 C001088 ASC 740 Deferral - AFUDC Equity 2025-01-01 2025-12-31 C001088 Interest Cash Flow Hedge 2025-01-01 2025-12-31 C001088 ISS Cash Out 2025-01-01 2025-12-31 C001088 Clay Basin Stipulation 2025-01-01 2025-12-31 C001088 ASC 740 Deferral - AFUDC Equity 2024-12-31 C001088 Interest Cash Flow Hedge 2024-12-31 C001088 ISS Cash Out 2024-12-31 C001088 Clay Basin Stipulation 2024-12-31 C001088 ASC 740 Deferral - AFUDC Equity 2025-12-31 C001088 Interest Cash Flow Hedge 2025-12-31 C001088 ISS Cash Out 2025-12-31 C001088 Annual Charge Adjustment 2025-01-01 2025-12-31 C001088 Contract Asset 2025-01-01 2025-12-31 C001088 Supense Projects 2025-01-01 2025-12-31 C001088 Miscellaneous 2025-01-01 2025-12-31 C001088 MountainWest 1996 Settlement Trust 2025-01-01 2025-12-31 C001088 Annual Charge Adjustment 2024-12-31 C001088 Supense Projects 2024-12-31 C001088 MountainWest 1996 Settlement Trust 2024-12-31 C001088 Annual Charge Adjustment 2025-12-31 C001088 Contract Asset 2025-12-31 C001088 Supense Projects 2025-12-31 C001088 MountainWest 1996 Settlement Trust 2025-12-31 C001088 ferc:OtherUtilityMember 2025-01-01 2025-12-31 C001088 ferc:OperatingUtilityMember 2024-12-31 C001088 ferc:OperatingUtilityMember 2025-01-01 2025-12-31 C001088 ferc:OperatingUtilityMember 2025-12-31 C001088 ferc:NonUtilityMember 2025-01-01 2025-12-31 C001088 Increases (Decreases) from Sales of Donations Received from Stockholders 2025-01-01 2025-12-31 C001088 Increases (Decreases) Due to Reductions in Par or Stated Value of Capital Stock 2025-01-01 2025-12-31 C001088 Increases (Decreases) from Gain or Resale or Cancellation of Reacquired Capital Stock 2025-01-01 2025-12-31 C001088 FIT Stock Options Excercise 2025-01-01 2025-12-31 C001088 Transtock Contribution 2025-01-01 2025-12-31 C001088 Capital Contribution 2025-01-01 2025-12-31 C001088 Return of Capital to Parent 2025-01-01 2025-12-31 C001088 Contributed Property 2025-01-01 2025-12-31 C001088 Increases (Decreases) Due to Miscellaneous Paid-In Capital 2025-01-01 2025-12-31 C001088 Increases (Decreases) in Other Paid-In Capital 2025-01-01 2025-12-31 C001088 Account 224 - Note 4.875% Due 2041 2025-01-01 2025-12-31 C001088 Account 224 - Note 3.53% Due 2028 2025-01-01 2025-12-31 C001088 Account 224 - Note 3.91% Due 2038 2025-01-01 2025-12-31 C001088 Account 224 - Note 4.875% Due 2041 2025-12-31 C001088 Account 224 - Note 3.53% Due 2028 2025-12-31 C001088 Account 224 - Note 3.91% Due 2038 2025-12-31 C001088 Account 181 - Note 4.875% Due 2041 2025-01-01 2025-12-31 C001088 Account 181 - Note 3.53% Due 2028 2025-01-01 2025-12-31 C001088 Account 181 - Note 3.91% Due 2038 2025-01-01 2025-12-31 C001088 TOTAL ACCOUNT 181 2025-01-01 2025-12-31 C001088 Account 181 - Note 4.875% Due 2041 2024-12-31 C001088 Account 181 - Note 3.53% Due 2028 2024-12-31 C001088 Account 181 - Note 3.91% Due 2038 2024-12-31 C001088 TOTAL ACCOUNT 181 2024-12-31 C001088 Account 181 - Note 4.875% Due 2041 2025-12-31 C001088 Account 181 - Note 3.53% Due 2028 2025-12-31 C001088 Account 181 - Note 3.91% Due 2038 2025-12-31 C001088 TOTAL ACCOUNT 181 2025-12-31 C001088 Discount on Long-Term Debt (Account 226) 2025-01-01 2025-12-31 C001088 Account 226 - 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Use, Sales And Use Tax, N/A, 2025 2025-12-31 C001088 Utah - Use , Sales And Use Tax, Utah, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 ferc:SalesAndUseTaxMember 2024-12-31 C001088 ferc:SalesAndUseTaxMember 2025-01-01 2025-12-31 C001088 ferc:SalesAndUseTaxMember 2025-12-31 C001088 ferc:SalesAndUseTaxMember ferc:ElectricUtilityMember 2025-01-01 2025-12-31 C001088 ferc:SalesAndUseTaxMember ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 ferc:SalesAndUseTaxMember ferc:OtherUtilityMember 2025-01-01 2025-12-31 C001088 District of Columbia Paid Family Leave, Payroll Tax, District of Columbia, 2025 2025-01-01 2025-12-31 C001088 Federal Unemployment, Payroll Tax, , 2025 2025-01-01 2025-12-31 C001088 Federal Medicare, Payroll Tax, , 2025 2025-01-01 2025-12-31 C001088 FICA, Payroll Tax, , 2025 2025-01-01 2025-12-31 C001088 Oregon - Oregon Workers Benefit Fund, Payroll Tax, Oregon, 2025 2025-01-01 2025-12-31 C001088 Alabama - Unemployment, Payroll Tax, Alabama, 2025 2025-01-01 2025-12-31 C001088 Arizona - Unemployment, Payroll Tax, Arizona, 2025 2025-01-01 2025-12-31 C001088 Arkansas - Unemployment, Payroll Tax, Arkansas, 2025 2025-01-01 2025-12-31 C001088 Colorado - Unemployment, Payroll Tax, Colorado, 2025 2025-01-01 2025-12-31 C001088 District of Columbia - Unemployment, Payroll Tax, District of Columbia, 2025 2025-01-01 2025-12-31 C001088 Florida - Unemployment, Payroll Tax, Florida, 2025 2025-01-01 2025-12-31 C001088 Georgia - Unemployment, Payroll Tax, Georgia, 2025 2025-01-01 2025-12-31 C001088 Illinois - Unemployment, Payroll Tax, Illinois, 2025 2025-01-01 2025-12-31 C001088 Kansas - Unemployment, Payroll Tax, Kansas, 2025 2025-01-01 2025-12-31 C001088 Louisiana - Unemployment, Payroll Tax, Louisiana, 2025 2025-01-01 2025-12-31 C001088 Massachusetts - Unemployment, Payroll Tax, Massachusetts, 2025 2025-01-01 2025-12-31 C001088 Minnesota - Unemployment, Payroll Tax, Minnesota, 2025 2025-01-01 2025-12-31 C001088 Montana - Unemployment, Payroll Tax, Minnesota, 2025 2025-01-01 2025-12-31 C001088 New Mexico - Unemployment, Payroll Tax, New Mexico, 2025 2025-01-01 2025-12-31 C001088 New Jersey - Unemployment, Payroll Tax, New Jersey, 2025 2025-01-01 2025-12-31 C001088 New York - Unemployment, Payroll Tax, New York, 2025 2025-01-01 2025-12-31 C001088 North Carolina - Unemployment, Payroll Tax, North Carolina, 2025 2025-01-01 2025-12-31 C001088 Ohio - Unemployment, Payroll Tax, Ohio, 2025 2025-01-01 2025-12-31 C001088 Oklahoma - Unemployment, Payroll Tax, Oklahoma, 2025 2025-01-01 2025-12-31 C001088 Oregon - Unemployment, Payroll Tax, Oregon, 2025 2025-01-01 2025-12-31 C001088 Pennsylvania - Unemployment, Payroll Tax, Pennsylvania, 2025 2025-01-01 2025-12-31 C001088 South Carolina - Unemployment, Payroll Tax, South Carolina, 2025 2025-01-01 2025-12-31 C001088 Tennessee - Unemployment, Payroll Tax, Tennessee, 2025 2025-01-01 2025-12-31 C001088 Texas - Unemployment, Payroll Tax, Texas, 2025 2025-01-01 2025-12-31 C001088 Utah - Unemployment, Payroll Tax, Utah, 2025 2025-01-01 2025-12-31 C001088 Virginia - Unemployment, Payroll Tax, Virginia, 2025 2025-01-01 2025-12-31 C001088 Washington - Unemployment, Payroll Tax, Washington, 2025 2025-01-01 2025-12-31 C001088 West Virginia - Unemployment, Payroll Tax, West Virginia, 2025 2025-01-01 2025-12-31 C001088 Wyoming - Unemployment, Payroll Tax, Wyoming, 2025 2025-01-01 2025-12-31 C001088 Washington Paid Family & Medical Leave, Payroll Tax, Washington, 2025 2025-01-01 2025-12-31 C001088 New Mexico - Workers Comp, Payroll Tax, New Mexico, 2025 2025-01-01 2025-12-31 C001088 District of Columbia Paid Family Leave, Payroll Tax, District of Columbia, 2025 2024-12-31 C001088 Federal Unemployment, Payroll Tax, , 2025 2024-12-31 C001088 Federal Medicare, Payroll Tax, , 2025 2024-12-31 C001088 FICA, Payroll Tax, , 2025 2024-12-31 C001088 Oregon - Oregon Workers Benefit Fund, Payroll Tax, Oregon, 2025 2024-12-31 C001088 Alabama - Unemployment, Payroll Tax, Alabama, 2025 2024-12-31 C001088 Arizona - Unemployment, Payroll Tax, Arizona, 2025 2024-12-31 C001088 Arkansas - Unemployment, Payroll Tax, Arkansas, 2025 2024-12-31 C001088 Colorado - Unemployment, Payroll Tax, Colorado, 2025 2024-12-31 C001088 District of Columbia - Unemployment, Payroll Tax, District of Columbia, 2025 2024-12-31 C001088 Florida - Unemployment, Payroll Tax, Florida, 2025 2024-12-31 C001088 Georgia - Unemployment, Payroll Tax, Georgia, 2025 2024-12-31 C001088 Illinois - Unemployment, Payroll Tax, Illinois, 2025 2024-12-31 C001088 Kansas - Unemployment, Payroll Tax, Kansas, 2025 2024-12-31 C001088 Louisiana - Unemployment, Payroll Tax, Louisiana, 2025 2024-12-31 C001088 Massachusetts - Unemployment, Payroll Tax, Massachusetts, 2025 2024-12-31 C001088 Minnesota - Unemployment, Payroll Tax, Minnesota, 2025 2024-12-31 C001088 Montana - Unemployment, Payroll Tax, Minnesota, 2025 2024-12-31 C001088 New Mexico - Unemployment, Payroll Tax, New Mexico, 2025 2024-12-31 C001088 New Jersey - Unemployment, Payroll Tax, New Jersey, 2025 2024-12-31 C001088 New York - Unemployment, Payroll Tax, New York, 2025 2024-12-31 C001088 North Carolina - Unemployment, Payroll Tax, North Carolina, 2025 2024-12-31 C001088 Ohio - Unemployment, Payroll Tax, Ohio, 2025 2024-12-31 C001088 Oklahoma - Unemployment, Payroll Tax, Oklahoma, 2025 2024-12-31 C001088 Oregon - Unemployment, Payroll Tax, Oregon, 2025 2024-12-31 C001088 Pennsylvania - Unemployment, Payroll Tax, Pennsylvania, 2025 2024-12-31 C001088 South Carolina - Unemployment, Payroll Tax, South Carolina, 2025 2024-12-31 C001088 Tennessee - Unemployment, Payroll Tax, Tennessee, 2025 2024-12-31 C001088 Texas - Unemployment, Payroll Tax, Texas, 2025 2024-12-31 C001088 Utah - Unemployment, Payroll Tax, Utah, 2025 2024-12-31 C001088 Virginia - Unemployment, Payroll Tax, Virginia, 2025 2024-12-31 C001088 Washington - Unemployment, Payroll Tax, Washington, 2025 2024-12-31 C001088 West Virginia - Unemployment, Payroll Tax, West Virginia, 2025 2024-12-31 C001088 Wyoming - Unemployment, Payroll Tax, Wyoming, 2025 2024-12-31 C001088 Washington Paid Family & Medical Leave, Payroll Tax, Washington, 2025 2024-12-31 C001088 New Mexico - Workers Comp, Payroll Tax, New Mexico, 2025 2024-12-31 C001088 District of Columbia Paid Family Leave, Payroll Tax, District of Columbia, 2025 2025-12-31 C001088 Federal Unemployment, Payroll Tax, , 2025 2025-12-31 C001088 Federal Medicare, Payroll Tax, , 2025 2025-12-31 C001088 FICA, Payroll Tax, , 2025 2025-12-31 C001088 Oregon - Oregon Workers Benefit Fund, Payroll Tax, Oregon, 2025 2025-12-31 C001088 Alabama - Unemployment, Payroll Tax, Alabama, 2025 2025-12-31 C001088 Arizona - Unemployment, Payroll Tax, Arizona, 2025 2025-12-31 C001088 Arkansas - Unemployment, Payroll Tax, Arkansas, 2025 2025-12-31 C001088 Colorado - Unemployment, Payroll Tax, Colorado, 2025 2025-12-31 C001088 District of Columbia - Unemployment, Payroll Tax, District of Columbia, 2025 2025-12-31 C001088 Florida - Unemployment, Payroll Tax, Florida, 2025 2025-12-31 C001088 Georgia - Unemployment, Payroll Tax, Georgia, 2025 2025-12-31 C001088 Illinois - Unemployment, Payroll Tax, Illinois, 2025 2025-12-31 C001088 Kansas - Unemployment, Payroll Tax, Kansas, 2025 2025-12-31 C001088 Louisiana - Unemployment, Payroll Tax, Louisiana, 2025 2025-12-31 C001088 Massachusetts - Unemployment, Payroll Tax, Massachusetts, 2025 2025-12-31 C001088 Minnesota - Unemployment, Payroll Tax, Minnesota, 2025 2025-12-31 C001088 Montana - Unemployment, Payroll Tax, Minnesota, 2025 2025-12-31 C001088 New Mexico - Unemployment, Payroll Tax, New Mexico, 2025 2025-12-31 C001088 New Jersey - Unemployment, Payroll Tax, New Jersey, 2025 2025-12-31 C001088 New York - Unemployment, Payroll Tax, New York, 2025 2025-12-31 C001088 North Carolina - Unemployment, Payroll Tax, North Carolina, 2025 2025-12-31 C001088 Ohio - Unemployment, Payroll Tax, Ohio, 2025 2025-12-31 C001088 Oklahoma - Unemployment, Payroll Tax, Oklahoma, 2025 2025-12-31 C001088 Oregon - Unemployment, Payroll Tax, Oregon, 2025 2025-12-31 C001088 Pennsylvania - Unemployment, Payroll Tax, Pennsylvania, 2025 2025-12-31 C001088 South Carolina - Unemployment, Payroll Tax, South Carolina, 2025 2025-12-31 C001088 Tennessee - Unemployment, Payroll Tax, Tennessee, 2025 2025-12-31 C001088 Texas - Unemployment, Payroll Tax, Texas, 2025 2025-12-31 C001088 Utah - Unemployment, Payroll Tax, Utah, 2025 2025-12-31 C001088 Virginia - Unemployment, Payroll Tax, Virginia, 2025 2025-12-31 C001088 Washington - Unemployment, Payroll Tax, Washington, 2025 2025-12-31 C001088 West Virginia - Unemployment, Payroll Tax, West Virginia, 2025 2025-12-31 C001088 Wyoming - Unemployment, Payroll Tax, Wyoming, 2025 2025-12-31 C001088 Washington Paid Family & Medical Leave, Payroll Tax, Washington, 2025 2025-12-31 C001088 New Mexico - Workers Comp, Payroll Tax, New Mexico, 2025 2025-12-31 C001088 District of Columbia Paid Family Leave, Payroll Tax, District of Columbia, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Federal Unemployment, Payroll Tax, , 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Federal Medicare, Payroll Tax, , 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 FICA, Payroll Tax, , 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Oregon - Oregon Workers Benefit Fund, Payroll Tax, Oregon, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Alabama - Unemployment, Payroll Tax, Alabama, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Arizona - Unemployment, Payroll Tax, Arizona, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Arkansas - Unemployment, Payroll Tax, Arkansas, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Colorado - Unemployment, Payroll Tax, Colorado, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 District of Columbia - Unemployment, Payroll Tax, District of Columbia, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Florida - Unemployment, Payroll Tax, Florida, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Georgia - Unemployment, Payroll Tax, Georgia, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Illinois - Unemployment, Payroll Tax, Illinois, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Kansas - Unemployment, Payroll Tax, Kansas, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Louisiana - Unemployment, Payroll Tax, Louisiana, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Massachusetts - Unemployment, Payroll Tax, Massachusetts, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Minnesota - Unemployment, Payroll Tax, Minnesota, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Montana - Unemployment, Payroll Tax, Minnesota, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 New Mexico - Unemployment, Payroll Tax, New Mexico, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 New Jersey - Unemployment, Payroll Tax, New Jersey, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 New York - Unemployment, Payroll Tax, New York, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 North Carolina - Unemployment, Payroll Tax, North Carolina, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Ohio - Unemployment, Payroll Tax, Ohio, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Oklahoma - Unemployment, Payroll Tax, Oklahoma, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Oregon - Unemployment, Payroll Tax, Oregon, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Pennsylvania - Unemployment, Payroll Tax, Pennsylvania, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 South Carolina - Unemployment, Payroll Tax, South Carolina, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Tennessee - Unemployment, Payroll Tax, Tennessee, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Texas - Unemployment, Payroll Tax, Texas, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Utah - Unemployment, Payroll Tax, Utah, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Virginia - Unemployment, Payroll Tax, Virginia, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Washington - Unemployment, Payroll Tax, Washington, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 West Virginia - Unemployment, Payroll Tax, West Virginia, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Wyoming - Unemployment, Payroll Tax, Wyoming, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Washington Paid Family & Medical Leave, Payroll Tax, Washington, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 New Mexico - Workers Comp, Payroll Tax, New Mexico, 2025 ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 ferc:PayrollTaxMember 2024-12-31 C001088 ferc:PayrollTaxMember 2025-01-01 2025-12-31 C001088 ferc:PayrollTaxMember 2025-12-31 C001088 ferc:PayrollTaxMember ferc:ElectricUtilityMember 2025-01-01 2025-12-31 C001088 ferc:PayrollTaxMember ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 ferc:PayrollTaxMember ferc:OtherUtilityMember 2025-01-01 2025-12-31 C001088 Property tax and other tax, , , 2025-01-01 2025-12-31 C001088 Franchise tax, , , 2025-01-01 2025-12-31 C001088 Property tax and other tax, , , 2024-12-31 C001088 Franchise tax, , , 2024-12-31 C001088 Property tax and other tax, , , 2025-12-31 C001088 Franchise tax, , , 2025-12-31 C001088 Property tax and other tax, , , ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 Franchise tax, , , ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 ferc:OtherAllocatedTaxMember 2024-12-31 C001088 ferc:OtherAllocatedTaxMember 2025-01-01 2025-12-31 C001088 ferc:OtherAllocatedTaxMember 2025-12-31 C001088 ferc:OtherAllocatedTaxMember ferc:ElectricUtilityMember 2025-01-01 2025-12-31 C001088 ferc:OtherAllocatedTaxMember ferc:GasUtilityMember 2025-01-01 2025-12-31 C001088 ferc:OtherAllocatedTaxMember ferc:OtherUtilityMember 2025-01-01 2025-12-31 C001088 ferc:ElectricUtilityMember 2025-01-01 2025-12-31 C001088 Park and Loan 2025-01-01 2025-12-31 C001088 Accrued Estimated Environmental Cost 2025-01-01 2025-12-31 C001088 Transportation and Exchange Gas Imbalance 2025-01-01 2025-12-31 C001088 Park and Loan 2025-12-31 C001088 Accrued Estimated Environmental Cost 2025-12-31 C001088 Transportation and Exchange Gas Imbalance 2025-12-31 C001088 General and Auto liability 2025-01-01 2025-12-31 C001088 Contract Liability 2025-01-01 2025-12-31 C001088 Environmental Accrual 2025-01-01 2025-12-31 C001088 Escheatable Items 2025-01-01 2025-12-31 C001088 Contract Liability 2024-12-31 C001088 Environmental Accrual 2024-12-31 C001088 Escheatable Items 2024-12-31 C001088 Contract Liability 2025-12-31 C001088 Environmental Accrual 2025-12-31 C001088 Escheatable Items 2025-12-31 C001088 ASC 715 - PBOP Reserve 2025-01-01 2025-12-31 C001088 Income Taxes Refundable Through Future Rates 2025-01-01 2025-12-31 C001088 Transmission Cash Out 2025-01-01 2025-12-31 C001088 Fuel Gas Reimbursement - Current 2025-01-01 2025-12-31 C001088 Fuel Gas Amortization - per: Jan-Dec 2025-01-01 2025-12-31 C001088 Overrun Revenue Sharing 2025-01-01 2025-12-31 C001088 ISS Revenue Sharing 2025-01-01 2025-12-31 C001088 Clay Basin Stipulation 2025-01-01 2025-12-31 C001088 PAL Revenue Sharing 2025-01-01 2025-12-31 C001088 ASC 715 - PBOP Reserve 2024-12-31 C001088 Income Taxes Refundable Through Future Rates 2024-12-31 C001088 Transmission Cash Out 2024-12-31 C001088 Fuel Gas Reimbursement - Current 2024-12-31 C001088 Fuel Gas Amortization - per: Jan-Dec 2024-12-31 C001088 Overrun Revenue Sharing 2024-12-31 C001088 ISS Revenue Sharing 2024-12-31 C001088 PAL Revenue Sharing 2024-12-31 C001088 ASC 715 - PBOP Reserve 2025-12-31 C001088 Income Taxes Refundable Through Future Rates 2025-12-31 C001088 Transmission Cash Out 2025-12-31 C001088 Fuel Gas Reimbursement - Current 2025-12-31 C001088 Fuel Gas Amortization - per: Jan-Dec 2025-12-31 C001088 Overrun Revenue Sharing 2025-12-31 C001088 ISS Revenue Sharing 2025-12-31 C001088 Clay Basin Stipulation 2025-12-31 C001088 PAL Revenue Sharing 2025-12-31 C001088 2025-11-01 2025-11-30 C001088 2025-12-01 2025-12-31 C001088 T-1 2025-01-01 2025-12-31 C001088 T-1-SSXP 2025-01-01 2025-12-31 C001088 NNT 2025-01-01 2025-12-31 C001088 T-2 2025-01-01 2025-12-31 C001088 FP 2025-01-01 2025-12-31 C001088 T-1 2025-10-01 2025-10-31 C001088 T-1-SSXP 2025-10-01 2025-10-31 C001088 T-2 2025-10-01 2025-10-31 C001088 NNT 2025-10-01 2025-10-31 C001088 T-1 2025-11-01 2025-11-30 C001088 T-1-SSXP 2025-11-01 2025-11-30 C001088 T-2 2025-11-01 2025-11-30 C001088 NNT 2025-11-01 2025-11-30 C001088 FP 2025-11-01 2025-11-30 C001088 T-1 2025-12-01 2025-12-31 C001088 T-1-SSXP 2025-12-01 2025-12-31 C001088 T-2 2025-12-01 2025-12-31 C001088 NNT 2025-12-01 2025-12-31 C001088 FP 2025-12-01 2025-12-31 C001088 2025-10-01 2025-10-31 C001088 PKS 2025-01-01 2025-12-31 C001088 FSS 2025-01-01 2025-12-31 C001088 ISS 2025-01-01 2025-12-31 C001088 PAL1 2025-01-01 2025-12-31 C001088 PKS 2025-10-01 2025-10-31 C001088 FSS 2025-10-01 2025-10-31 C001088 ISS 2025-10-01 2025-10-31 C001088 PAL1 2025-10-01 2025-10-31 C001088 0 2025-10-01 2025-10-31 C001088 0 2025-01-01 2025-12-31 C001088 PKS 2025-11-01 2025-11-30 C001088 FSS 2025-11-01 2025-11-30 C001088 ISS 2025-11-01 2025-11-30 C001088 PAL1 2025-11-01 2025-11-30 C001088 0 2025-11-01 2025-11-30 C001088 PKS 2025-12-01 2025-12-31 C001088 FSS 2025-12-01 2025-12-31 C001088 ISS 2025-12-01 2025-12-31 C001088 PAL1 2025-12-01 2025-12-31 C001088 0 2025-12-01 2025-12-31 C001088 T-1 2025-01-01 2025-12-31 C001088 NNT 2025-01-01 2025-12-31 C001088 T-2 2025-01-01 2025-12-31 C001088 T-1-SSXP 2025-01-01 2025-12-31 C001088 FP 2025-01-01 2025-12-31 C001088 T-1 2024-01-01 2024-12-31 C001088 T-2 2024-01-01 2024-12-31 C001088 T-1-SSXP 2024-01-01 2024-12-31 C001088 NNT 2024-01-01 2024-12-31 C001088 FP 2024-01-01 2024-12-31 C001088 0 2025-01-01 2025-12-31 C001088 0 2024-01-01 2024-12-31 C001088 FSS 2025-01-01 2025-12-31 C001088 PKS 2025-01-01 2025-12-31 C001088 ISS 2025-01-01 2025-12-31 C001088 PAL1 2025-01-01 2025-12-31 C001088 TOTAL 2025-01-01 2025-12-31 C001088 FSS 2024-01-01 2024-12-31 C001088 ISS 2024-01-01 2024-12-31 C001088 TOTAL 2024-01-01 2024-12-31 C001088 PKS 2024-01-01 2024-12-31 C001088 PAL1 2024-01-01 2024-12-31 C001088 Other revenues (Specify): 2025-01-01 2025-12-31 C001088 Clay Basin Stipulation 2025-01-01 2025-12-31 C001088 OBA Sales 2025-01-01 2025-12-31 C001088 PAL Fuel Revenue 2025-01-01 2025-12-31 C001088 Miscellaneous Revenue 2025-01-01 2025-12-31 C001088 Account 489.1, Revenues from transportation of gas of others through gathering facilities 2025-01-01 2025-12-31 C001088 Account 489.2, Revenues from transportation of gas of others through transmission facilities 2025-01-01 2025-12-31 C001088 Account 489.4, Revenues from storing gas of others 2025-01-01 2025-12-31 C001088 Account 495, Other gas revenues 2025-01-01 2025-12-31 C001088 System Balancing Gas 2025-01-01 2025-12-31 C001088 812 Gas Used for Other Utility Operations - Credit (Report separately for each principal use. Group minor uses.) 2025-01-01 2025-12-31 C001088 MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 White River Hub, LLC 2025-01-01 2025-12-31 C001088 Other 2025-01-01 2025-12-31 C001088 Lost & Unaccounted For Gas 2025-01-01 2025-12-31 C001088 Cost of Gas Sold 2025-01-01 2025-12-31 C001088 PAL Fuel Expense 2025-01-01 2025-12-31 C001088 General Expense Allocation 2025-01-01 2025-12-31 C001088 Miscellaneous 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember ferc:IntangiblePlantMember 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember ferc:UndergroundGasStoragePlantMember 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember ferc:TransmissionPlantMember 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember ferc:GeneralPlantMember 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember ferc:UndergroundGasStoragePlantMember 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember ferc:TransmissionPlantOnshoreMember 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember ferc:GeneralPlantMember 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember Intangible 2025-01-01 2025-12-31 C001088 ferc:GasUtilityMember Electronic Flow Measurement 2025-01-01 2025-12-31 C001088 Intangible 2025-01-01 2025-12-31 C001088 Electronic Flow Measurement 2025-01-01 2025-12-31 C001088 425 - Miscellaneous Amortization 2025-01-01 2025-12-31 C001088 426.1 - Allocations 2025-01-01 2025-12-31 C001088 426.2 - Life Insurance 2025-01-01 2025-12-31 C001088 426.4 - Allocations 2025-01-01 2025-12-31 C001088 426.4 - Lobbying Expense 2025-01-01 2025-12-31 C001088 426.5 - Project Writeoffs 2025-01-01 2025-12-31 C001088 426.5 - Other 2025-01-01 2025-12-31 C001088 430.0 - Letters of Credit 2025-01-01 2025-12-31 C001088 431.0 - Interest and Penalties 2025-01-01 2025-12-31 C001088 431.0 - Miscellaneous 2025-01-01 2025-12-31 C001088 Federal Energy Regulatory Comission RM87-3 2025-01-01 2025-12-31 C001088 Other 2025-01-01 2025-12-31 C001088 Federal Energy Regulatory Comission RM87-3 2025-12-31 C001088 Other 2025-12-31 C001088 Chargeout of expenses 2025-01-01 2025-12-31 C001088 Investment plus plan 2025-01-01 2025-12-31 C001088 Group insurance Plans 2025-01-01 2025-12-31 C001088 Benefit and payroll tax accrual 2025-01-01 2025-12-31 C001088 Corporate Benefits allocation 2025-01-01 2025-12-31 C001088 Other Employee Welfare Costs 2025-01-01 2025-12-31 C001088 Retirement Plan 2025-01-01 2025-12-31 C001088 ferc:DirectPayrollDistributionMember 2025-01-01 2025-12-31 C001088 ferc:PayrollBilledByAffiliatedCompaniesMember 2025-01-01 2025-12-31 C001088 ferc:AllocationOfPayrollChargedForClearingAccountsMember 2025-01-01 2025-12-31 C001088 Other Accounts (Specify) 2025-01-01 2025-12-31 C001088 Other Preliminary Survey and Investigation Charges (183.2) 2025-01-01 2025-12-31 C001088 Miscellaneous Deferred Debits (186) 2025-01-01 2025-12-31 C001088 Clearing Accounts (184) 2025-01-01 2025-12-31 C001088 Stock Amortizations (various operating accounts) 2025-01-01 2025-12-31 C001088 ferc:DirectPayrollDistributionMember Other Preliminary Survey and Investigation Charges (183.2) 2025-01-01 2025-12-31 C001088 ferc:DirectPayrollDistributionMember Miscellaneous Deferred Debits (186) 2025-01-01 2025-12-31 C001088 ferc:DirectPayrollDistributionMember Stock Amortizations (various operating accounts) 2025-01-01 2025-12-31 C001088 ferc:PayrollBilledByAffiliatedCompaniesMember Other Preliminary Survey and Investigation Charges (183.2) 2025-01-01 2025-12-31 C001088 ferc:PayrollBilledByAffiliatedCompaniesMember Miscellaneous Deferred Debits (186) 2025-01-01 2025-12-31 C001088 ALLEGIS GLOBAL SOLUTIONS INC 2025-01-01 2025-12-31 C001088 AUDIE PRICE INSPECTION INC 2025-01-01 2025-12-31 C001088 BH INC 2025-01-01 2025-12-31 C001088 BWS INSPECTION SERVICES LLC 2025-01-01 2025-12-31 C001088 COASTAL CHEMICAL CO LLC 2025-01-01 2025-12-31 C001088 COOPER MACHINERY SERVICES LLC 2025-01-01 2025-12-31 C001088 D2 INTEGRITY LLC 2025-01-01 2025-12-31 C001088 FLARE CONSTRUCTION LLC 2025-01-01 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C001088 Goods or Services Provided by Affiliated Company Employee Benefits and Taxes, Williams WPC-1, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Employee Charges, Williams WPC-1, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Direct Assignment Payroll, Benefits, and Taxes, Williams WPC-1, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Corporate Allocations, Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Fleet Allocations, Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Stock Based Compensation, Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Employee Stock Purchase Plan, Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Employee Charges, Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Contracted Services, Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Work Order Transfers , Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Inventory Transfers, Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Operating Area Allocations, Williams Partners Operating LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Storage Facilities Allocations, Williams Partners Operating LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Work Order Allocations, Williams Partners Operating LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Fixed Asset Transfers , Williams Partners Operating LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Contracted Services, MountainWest Energy Services, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Inventory Transfers , Williams Field Services Group, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Cashout Activity, Sequent Energy Management LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Work Order Transfers , MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Inventory Transfers , MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Transportation of Gas of Others Through Transmission Facilities , MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Rent Allocations , Transcontinental Gas Pipe Line Company, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Software Allocations, Transcontinental Gas Pipe Line Company, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Other, Transcontinental Gas Pipe Line Company, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Work Order Transfers, Northwest Pipeline LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided by Affiliated Company Inventory Transfers, Northwest Pipeline LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Capital Workorder Overheads, Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Work Order Transfers , Williams Companies, Inc. 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company General and Administrative Allocations, Williams Partners Operating LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Rent Allocations, Williams Partners Operating LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Fixed Asset Transfers , Williams Partners Operating LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Inventory Transfers, Williams Partners Operating LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Rent Allocations, Williams Field Services Group, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Capital Workorder Overheads, Williams Field Services Group, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Inventory Transfers , Williams Field Services Group, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Gas Sold, Sequent Energy Management LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Transportation of Gas of Others Through Transmission Facilities, Sequent Energy Management LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Storing Gas of Others, Sequent Energy Management LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Interest on Borrowing, MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company General and Administrative Allocations, MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Rent Allocations, MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Work Order Transfers , MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Inventory Transfers , MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Gas Sold, MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Transportation of Gas of Others Through Transmission Facilities , MountainWest Overthrust Pipeline, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Rent Allocations , Transcontinental Gas Pipe Line Company, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Inventory Transfers, Transcontinental Gas Pipe Line Company, LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Rent Allocations, Northwest Pipeline LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Facility Rent, Northwest Pipeline LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Inventory Transfers , Northwest Pipeline LLC 2025-01-01 2025-12-31 C001088 Goods or Services Provided for Affiliated Company Storing Gas of Others, Northwest Pipeline LLC 2025-01-01 2025-12-31 C001088 FIELD COMPRESSOR STATIONS:, Field Compressor Stations 2025-01-01 2025-12-31 C001088 SUBTOTAL FIELD COMPRESSOR STATIONS, Field Compressor Stations 2025-01-01 2025-12-31 C001088 UNDERGROUND STORAGE COMPRESSOR STATIONS:, Underground Storage Compressor Stations 2025-01-01 2025-12-31 C001088 Utah - Cash (was Coalville), Underground Storage Compressor Stations 2025-01-01 2025-12-31 C001088 Utah - Chalk Creek, Underground Storage Compressor Stations 2025-01-01 2025-12-31 C001088 Utah - Kastler, Underground Storage Compressor Stations 2025-01-01 2025-12-31 C001088 Utah - Clay Basin, Underground Storage Compressor Stations 2025-01-01 2025-12-31 C001088 Wyoming - Leroy, Underground Storage Compressor Stations 2025-01-01 2025-12-31 C001088 SUBTOTAL UNDERGROUND STORAGE COMPRESSOR STATIONS, Underground Storage Compressor Stations 2025-01-01 2025-12-31 C001088 TRANSMISSION COMPRESSOR STATIONS:, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Colorado - Greasewood, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Colorado - Skull Creek Dew Point, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Utah - Blind Canyon, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Utah - Fidlar, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Utah - Oak Spring, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Utah - Thistle Creek, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Wyoming - Coleman, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Wyoming - Eakin, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Wyoming - Kanda, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Wyoming - Nightingale, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Wyoming - Simon, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 Wyoming - Skull Creek, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 SUBTOTAL TRANSMISSION COMPRESSOR STATIONS, Transmission Compressor Stations 2025-01-01 2025-12-31 C001088 OTHER COMPRESSOR STATIONS:, Other Compressor Stations 2025-01-01 2025-12-31 C001088 ferc:JanuaryMember 2025-01-01 2025-12-31 C001088 ferc:FebruaryMember 2025-01-01 2025-12-31 C001088 ferc:MarchMember 2025-01-01 2025-12-31 C001088 ferc:AprilMember 2025-01-01 2025-12-31 C001088 ferc:MayMember 2025-01-01 2025-12-31 C001088 ferc:JuneMember 2025-01-01 2025-12-31 C001088 ferc:JulyMember 2025-01-01 2025-12-31 C001088 ferc:AugustMember 2025-01-01 2025-12-31 C001088 ferc:SeptemberMember 2025-01-01 2025-12-31 C001088 ferc:OctoberMember 2025-01-01 2025-12-31 C001088 ferc:NovemberMember 2025-01-01 2025-12-31 C001088 ferc:DecemberMember 2025-01-01 2025-12-31 C001088 Colorado Transmission Lines 2025-01-01 2025-12-31 C001088 Utah Transmission Lines 2025-01-01 2025-12-31 C001088 Wyoming Transmission Lines 2025-01-01 2025-12-31 C001088 Colorado Transmission Lines 2025-12-31 C001088 Utah Transmission Lines 2025-12-31 C001088 Wyoming Transmission Lines 2025-12-31 C001088 ferc:FullyOwnedAndOperatedByRespondentMember 2025-12-31 C001088 ferc:FullyOwnedAndOperatedByRespondentMember 2025-01-01 2025-12-31 C001088 ferc:DeliveredToOthersMember ferc:SingleDayPeakDeliveriesMember 2025-01-01 2025-12-31 C001088 ferc:DeliveredToInterstatePipelinesMember ferc:SingleDayPeakDeliveriesMember 2025-01-01 2025-12-31 C001088 ferc:SingleDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:DeliveredToInterstatePipelinesMember ferc:SingleDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:DeliveredToOthersMember ferc:SingleDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:SingleDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:DeliveredToOthersMember ferc:SingleDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:SingleDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:DeliveredToOthersMember ferc:ThreeDayPeakDeliveriesMember 2025-01-01 2025-12-31 C001088 ferc:DeliveredToInterstatePipelinesMember ferc:ThreeDayPeakDeliveriesMember 2025-01-01 2025-12-31 C001088 ferc:ThreeDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:DeliveredToInterstatePipelinesMember ferc:ThreeDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:DeliveredToOthersMember ferc:ThreeDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:ThreeDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:DeliveredToOthersMember ferc:ThreeDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 ferc:ThreeDayPeakDeliveriesMember Other (Describe) (footnote details) 2025-01-01 2025-12-31 C001088 Summit County, Utah 2025-01-01 2025-12-31 C001088 Chalk Creek Storage 2025-01-01 2025-12-31 C001088 Summit County, Utah - 2025-01-01 2025-12-31 C001088 Coalville Storage 2025-01-01 2025-12-31 C001088 Uinta County, Wyoming 2025-01-01 2025-12-31 C001088 Leroy Storage Project 2025-01-01 2025-12-31 C001088 Daggett County, Utah 2025-01-01 2025-12-31 C001088 Clay Basin Storage 2025-01-01 2025-12-31 C001088 MountainWest Pipeline, LLC 2025-01-01 2025-12-31 C001088 MountainWest Pipeline, LLC 2025-10-01 2025-12-31 C001088 MountainWest Pipeline, LLC Other Receipts (Specify)(footnote details) 2025-01-01 2025-12-31 C001088 Other Receipts (Specify)(footnote details) MountainWest Pipeline, LLC 2025-10-01 2025-12-31 C001088 MountainWest Pipeline, LLC Other Deliveries and Gas Used for Other Operations 2025-01-01 2025-12-31 C001088 Other Deliveries and Gas Used for Other Operations MountainWest Pipeline, LLC 2025-10-01 2025-12-31 C001088 ferc:DebitedMember 2025-10-01 2025-10-31 C001088 ferc:CreditedMember 2025-10-01 2025-10-31 C001088 ferc:DiscountedRateMember 2025-10-01 2025-10-31 C001088 ferc:NegotiatedRateMember 2025-10-01 2025-10-31 C001088 ferc:RecourseRateMember 2025-10-01 2025-10-31 C001088 Gas to be received from shippers 2025-10-01 2025-10-31 C001088 Gas to be received from shippers ferc:DiscountedRateMember 2025-10-01 2025-10-31 C001088 Gas to be received from shippers ferc:NegotiatedRateMember 2025-10-01 2025-10-31 C001088 Gas to be received from shippers ferc:RecourseRateMember 2025-10-01 2025-10-31 C001088 ferc:DebitedMember Gas to be received from shippers 2025-10-01 2025-10-31 C001088 ferc:CreditedMember Gas to be received from shippers 2025-10-01 2025-10-31 C001088 2025-10-01 2025-12-31 C001088 ferc:DiscountedRateMember 2025-11-01 2025-11-30 C001088 ferc:NegotiatedRateMember 2025-11-01 2025-11-30 C001088 ferc:RecourseRateMember 2025-11-01 2025-11-30 C001088 ferc:DebitedMember 2025-11-01 2025-11-30 C001088 ferc:CreditedMember 2025-11-01 2025-11-30 C001088 ferc:DebitedMember 0 2025-11-01 2025-11-30 C001088 ferc:CreditedMember 0 2025-11-01 2025-11-30 C001088 Gas to be received from shippers 2025-11-01 2025-11-30 C001088 Gas to be received from shippers ferc:DiscountedRateMember 2025-11-01 2025-11-30 C001088 Gas to be received from shippers ferc:NegotiatedRateMember 2025-11-01 2025-11-30 C001088 Gas to be received from shippers ferc:RecourseRateMember 2025-11-01 2025-11-30 C001088 ferc:DebitedMember Gas to be received from shippers 2025-11-01 2025-11-30 C001088 ferc:CreditedMember Gas to be received from shippers 2025-11-01 2025-11-30 C001088 ferc:DiscountedRateMember 2025-12-01 2025-12-31 C001088 ferc:NegotiatedRateMember 2025-12-01 2025-12-31 C001088 ferc:RecourseRateMember 2025-12-01 2025-12-31 C001088 ferc:DebitedMember 2025-12-01 2025-12-31 C001088 ferc:CreditedMember 2025-12-01 2025-12-31 C001088 Gas to be received from shippers 2025-12-01 2025-12-31 C001088 Gas to be received from shippers ferc:DiscountedRateMember 2025-12-01 2025-12-31 C001088 Gas to be received from shippers ferc:NegotiatedRateMember 2025-12-01 2025-12-31 C001088 Gas to be received from shippers ferc:RecourseRateMember 2025-12-01 2025-12-31 C001088 ferc:DebitedMember Gas to be received from shippers 2025-12-01 2025-12-31 C001088 ferc:CreditedMember Gas to be received from shippers 2025-12-01 2025-12-31 Billeigh Mark Chief Accounting Officer P.O. Box 1396 Houston, Texas 77251-1396 UT 2022-04-01 NOT APPLICABLE Colorado - Transportation of Natural Gas;Utah - Transportation and Storage of Natural Gas;Wyoming - Transportation and Storage of Natural Gas. false <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 1 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 2 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 3 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 3 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 4 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 5 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 6 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 7 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 8 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 9 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 10 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 11 - N/A</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 12</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective April 2, 2025, Bradley W. Shindle resigned as Vice President.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective May 2, 2025, Micheal G. Dunn retired from the company as Executive Vice President.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective May 3, 2025, Larry C. Larsen was elected as Executive Vice President.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective June 1, 2025, Mary A. Hausman resigned as Chief Accounting Officer.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective June 1, 2025, Billeigh W. Mark resigned as Controller, and was elected as Chief Accounting Officer.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective June 1, 2025, Natalie R. Drummond was elected as Controller.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective July 7, 2025, Greg Houston was elected Vice President.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective July 14, 2025, Robert R. Wingo replaced Chad J. Zamarin as Executive Vice President..</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective August 13, 2025, Candyce Fly Lee left the company as Vice President.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective August 14, 2025, Robert T. Biffle resigned as Vice President.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective October 3, 2025, Mark Gebbia left the company as Vice President.</span></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Effective October 4, 2025, John L. Suchar was elected as Vice President.</span></div> <div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Item 13 - N/A</span></div> <div style="margin-top:10pt;padding-left:9pt;text-align:justify;text-indent:-9pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note 1 - Summary of Significant Accounting Policies</span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Nature of Operations</span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">MountainWest Pipeline owns and operates interstate natural gas pipelines and storage facilities in the western United States and is headquartered in Salt Lake City, Utah. MountainWest Pipeline is a wholly-owned subsidiary of MountainWest Pipelines Holding Company, which is a wholly-owned subsidiary of The Williams Companies, Inc. (Williams). </span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:115%">Basis of Presentation</span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">MountainWest Pipeline, LLC's financial statements were prepared in accordance with the accounting requirements of the Federal Energy Regulatory Commission (FERC) as set forth in its Uniform System of Accounts (USofA) and published accounting releases which is a comprehensive basis of accounting other than accounting principles generally accepted in the United States (GAAP). The principal differences from GAAP include the classification of certain amounts in our financial statements and the inclusion of income taxes in limited liability company's financial statements. </span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">We have evaluated subsequent events through the date our financial statements were available to be issued on April 13, 2026.</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">MountainWest Pipeline makes certain estimates and assumptions in preparing its financial statements in accordance with the USofA.These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of assets and liabilities at the date of the financial statements and the reported amounts of revenue, expenses and cash flows for the periods presented. Actual results may differ from those estimates</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">.</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Income Taxes</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:107%">Williams and its wholly owned subsidiaries, which includes us, file a consolidated federal income tax return. It is Williams’ policy to charge or credit its taxable subsidiaries with an amount equivalent to their federal income tax expense or benefit computed as if each subsidiary had filed a separate return.</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:107%">As a limited liability company, MountainWest Pipeline is no longer a taxable entity for income tax purposes; however, amounts equivalent to current and deferred income tax expense based on corporate tax rates are presented in the accompanying financial statements since income taxes are a cost component for MountainWest Pipeline’s currently effective rates.</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:107%">We use the assets and liabilities method of accounting for income taxes, which requires, among other things, provisions for all temporary differences between the financial basis and the tax basis in our assets and liabilities and adjustments to the existing deferred tax balances for changes in tax rates. </span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:115%">Operating Revenue</span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Operating revenue is recorded on the basis of services rendered, commodities delivered or contracts settled. MountainWest Pipeline is currently generating significant revenue and earnings from annual reservation payments under firm storage and firm transportation contracts. Straight-fixed-variable rate designs are used to allow for recovery of substantially all fixed costs in the demand or reservation charges, thereby reducing the earnings impact of volume changes on gas transportation and storage operations. Operating revenue consists primarily of FERC-regulated transmission sales and service activities. </span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">MountainWest Pipeline receives upfront payment for certain storage services it provides to customers, such as park and loan agreements, which are considered to be contract liabilities. These payments are amortized to revenue over the term of the contract. When a customer borrows gas in a park and loan agreement, MountainWest Pipeline establishes a gas receivable in other current assets as well as contra-asset within property, plant and equipment to account for the reduced gas in storage. When a customer lends gas in a park and loan agreement, MountainWest Pipeline establishes a gas payable in other current liabilities as well as an offset within property, plant and equipment to account for the increased gas in storage. </span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Transportation and storage contracts are primarily stand-ready service contracts that include fixed reservation and variable usage fees. Fixed fees are recognized ratably over the life of the contract as the stand-ready performance obligations are satisfied, while variable usage fees are recognized when MountainWest Pipeline has a right to consideration from a customer in an amount that corresponds directly with the value to the customer of the performance obligation completed to date. Substantially all of MountainWest Pipeline’s revenues are derived from performance obligations satisfied over time, rather than recognized at a single point in time. The contract with the customer states the final terms of the sale, including the description, quantity and price of each product or service purchased. Payment for most sales and services varies by contract type but is typically due within a month of billing. </span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">MountainWest Pipeline typically receives or retains NGLs and natural gas from customers when providing natural gas processing, transportation or storage services. MountainWest Pipeline records the fair value of NGLs received as service revenue recognized over time and recognizes revenue from the subsequent sale of the NGLs to customers upon delivery. MountainWest Pipeline typically retains natural gas under certain transportation service arrangements that are intended to facilitate performance of the service and allow for natural losses that occur. </span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Cash</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Cash includes cash in banks and temporary investments purchased with an original maturity of three months or less.</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:12pt;font-weight:400;line-height:112%"> </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Current banking arrangements generally do not require checks to be funded until they are presented for payment. At December 31, 2025 and 2024, accounts payable included $0.9 million and $0.8 million, respectively, of checks outstanding but not yet presented for payment. </span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">MountainWest Pipeline holds cash for customer deposits as allowed under FERC gas tariffs. MountainWest Pipeline held $3.2 million and $4.9 million in cash at December 31, 2025 and 2024, respectively. These amounts are shown on MountainWest Pipeline’s Comparative Balance Sheet in Account 134–</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:112%">Special Deposits.</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%"> </span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:112%">Statement of Cash Flows</span></div><div style="margin-top:12pt;text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:66.459%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.822%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.824%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="text-align:center"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31, </span></div></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="9" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 7pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Supplemental Disclosure</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Cash paid during the year for interest, excluding capitalized amounts</span></td><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">18.1 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">17.9 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 7pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Significant noncash investing and financing activities:</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Accrued capital expenditures</span></td><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.7 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.7 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr></table></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Investments in Subsidiary Companies</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">MountainWest Pipeline owns 50% of White River Hub, LLC (White River Hub) a FERC-regulated transporter of natural gas, through MountainWest White River Hub, LLC, and is the operator. MountainWest Pipeline also owns 100% of MountainWest Overthrust Pipeline, LLC, which is also a FERC regulated transporter of natural gas as well as 100% of MountainWest Field Services, LLC, which owns and operates a processing facility and gathering lines. Under the definitions in the USofA, White River Hub, Overthrust, and Field Services are subsidiary companies for FERC reporting purposes. MountainWest Pipeline uses the equity method to account for its investment in subsidiary companies for FERC purposes. </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:112%">Property, Plant and Equipment</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Property, plant and equipment is recorded at original cost. The carrying values of these assets are also based on estimates, assumptions and judgments relative to capitalized costs, useful lives and salvage values. These estimates, assumptions and judgments reflect FERC regulations, as well as historical experience and expectations regarding future industry conditions and operations. The FERC identifies installation, construction and replacement costs that are to be capitalized. All other costs are expensed as incurred. Gains or losses from the ordinary sale or retirement of property, plant and equipment are credited or charged to accumulated depreciation; certain other gains or losses are recorded in operating income.</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We provide for depreciation primarily under the composite (group) method using straight-line FERC prescribed rates. Under this method, assets with similar lives and characteristics are grouped and depreciated as one asset. Our depreciation rates are subject to change each time we file a general rate case with the FERC.</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Asset Retirement Obligations</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">We record a liability and increase the basis in the underlying asset for the present value of each expected future Asset Retirement Obligation (ARO) at the time the liability is initially incurred, typically when the asset is acquired or constructed. Measurements of AROs include, as a component of future expected costs, an estimate of the price that a third party would demand, and could expect to receive, for bearing the uncertainties inherent in the obligations, sometimes referred to as a market-risk premium. The ARO asset is depreciated in a manner consistent with the expected timing of the future abandonment of the underlying physical assets. We measure changes in the liability due to passage of time by applying an interest method of allocation. </span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:112%">Allowance for Funds Used During Construction</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Allowance for funds used during construction (AFUDC) represents the estimated cost of borrowed and equity funds applicable to utility plant in process of construction and are included as a cost of property, plant and equipment because it constitutes an actual cost of construction under established regulatory practices. The FERC has prescribed a formula to be used in computing separate allowances for borrowed and equity AFUDC. MountainWest Pipeline capitalized AFUDC of $0.6 million and $0.8 million to property, plant and equipment for the year ended December 31, 2025 and 2024, respectively.</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Natural Gas Imbalances</span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Natural gas imbalances occur when the physical amount of natural gas delivered from, or received by, a pipeline system or storage facility differs from the contractual amount of natural gas delivered or received. MountainWest Pipeline values these imbalances due to or from shippers and operators at an appropriate index price at period-end subject to the terms of its tariff.</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:12pt;font-weight:400;line-height:120%"> </span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Imbalances are settled in-kind and in cash.</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:12pt;font-weight:400;line-height:120%"> </span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Imbalances due from others are reported in Account 174-</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Miscellaneous Current and Accrued Assets</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> and imbalances owed to others are reported in Account 242-</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Miscellaneous Current and Accrued Liabilities</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">. See Note 6 for amounts related to affiliates. </span></div><div style="margin-top:10pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note 2 - Income Taxes</span></div><div style="margin-top:10pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Following is a summary of the provision for income taxes:</span></div><div style="margin-top:10pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:66.459%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.822%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.824%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31, </span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="9" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Current:</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Federal</span></td><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">6.2 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(0.9)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">State</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1.3 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(0.2)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">         Total current</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">7.5 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(1.1)</span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr style="height:14pt"><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:3pt double #000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:3pt double #000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Deferred:</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Federal</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2.4 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">9.4 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">State</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.5 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2.0 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">         Total deferred</span></td><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2.9 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">11.4 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr style="height:14pt"><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Provision for income taxes</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10.4 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10.3 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr></table></div><div style="margin-top:5pt;text-indent:27pt"><span><br/></span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Following is a reconciliation of the provision for income taxes at the federal statutory rate to the provision for income taxes:</span></div><div style="margin-top:10pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:99.851%"><tr><td style="width:1.0%"/><td style="width:54.786%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:12.014%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:7.841%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.396%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.567%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:7.696%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="15" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31, </span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">%</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">%</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="15" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Provision (benefit) for income taxes at the federal statutory rate</span></td><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">20.9 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">21.0 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">20.5 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">21.0 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">State and local income taxes, net of federal benefit</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1.5 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1.5 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1.4 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">1.5 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Regulatory asset Equity AFUDC</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(0.1)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(0.1)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(0.1)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(0.1)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Regulatory liability excess deferred income tax amortization</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(1.4)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(1.4)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(1.4)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(1.5)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Equity of Subsidiaries</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(10.6)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(10.6)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(10.2)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(10.4)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Nontaxable or nondeductible items</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.1 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.1 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.1 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.1 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Provision (benefit) for income taxes</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10.4 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10.5 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10.3 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="2" style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10.6 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td></tr></table></div><div style="margin-top:10pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Significant components of deferred income tax liabilities and assets are as follows:</span></div><div style="margin-top:10pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:66.459%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.822%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.824%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31, </span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline">Deferred tax liabilities:</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Property, plant and equipment</span></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">16.1 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">11.9 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Regulatory assets</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">7.0 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">7.2 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Other</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.7 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.6 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 25pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Total deferred tax liabilities</span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">23.8 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000;padding:0 1pt"/><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">19.7 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr style="height:14pt"><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline">Deferred tax assets:</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Regulatory liabilities</span></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">14.7 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">15.9 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Accrued Liabilities</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3.4 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3.3 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 13pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Other</span></td><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.0</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.0</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 25pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Total deferred tax assets</span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">18.1 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000;padding:0 1pt"/><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">19.2 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr style="height:15pt"><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Net deferred tax liabilities</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">5.7 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.5 </span></td><td style="background-color:#cceeff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr></table></div><div style="margin-top:10pt"><span><br/></span></div><div style="padding-left:4.68pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">As MountainWest Pipeline is not subject to income taxes, an income taxes paid table has not been presented. See Note 1 for income taxes for additional information. </span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note 3 - Asset Retirement Obligations</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Management estimated and recognized AROs primarily associated with natural gas transmission pipelines and underground storage facilities. These obligations also include restoration of the property sites after removal of the facilities from above and below ground.</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:115%">The changes to AROs are as follow:</span></div><div style="margin-top:10pt;text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:66.459%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.822%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.824%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="text-align:center"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31,</span></div></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="9" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Balance at beginning of year</span></div></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10.8 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10.0 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><div style="padding-left:12pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Accretion</span></div></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.8 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.8 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Balance at end of year</span></div></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">11.6 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">10.8 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr></table></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note 4 - Long-Term Debt</span></div><div style="margin-top:10pt;text-align:justify"><span><br/></span></div><div style="margin-top:10pt;text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:47.263%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:17.501%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.822%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.824%"/><td style="width:0.1%"/></tr><tr style="height:12pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" rowspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:center"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31,</span></div></td></tr><tr style="height:12pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td></tr><tr style="height:12pt"><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Notes:</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Unsecured senior notes, 3.53%, due in 2028</span></td><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3.53%</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">100.0 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">100.0 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Unsecured senior notes, 4.875%, due in 2041</span></td><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">4.875%</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">180.0 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">180.0 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Unsecured senior notes, 3.91%, due in 2038</span></td><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3.91%</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">150.0 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">150.0 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 37pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Total principal</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">430.0 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">430.0 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Unamortized discount and premium, net</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(1.2)</span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(1.3)</span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr style="height:15pt"><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Total long-term debt</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">428.8 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">428.7 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr></table></div><div style="margin-top:5pt;padding-left:36pt;text-align:justify"><span><br/></span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Based on stated maturity dates the scheduled principal payments of long-term debt at December 31, 2025 were as follows:</span></div><div style="margin-top:12pt;text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:34.614%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:7.382%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:7.382%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.841%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:7.382%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:5.894%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:6.191%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:2.776%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:7.977%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:7.386%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2026</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2027</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2028</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2029</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2030</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Thereafter</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Total</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">(millions, except percentages)</span></td><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Principal</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">100.0 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">330.0 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">430.0 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Weighted-average coupon</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3.53 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">4.44 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">%</span></td><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/></tr></table></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:107%">MountainWest Pipeline’s long-term debt agreements contain customary covenants and default provisions. At December 31, 2025, MountainWest Pipeline was in compliance with the financial covenants associated with its long-term debt agreements.</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note 5 - Commitments and Contingencies</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">As a result of issues generated in the ordinary course of business, MountainWest Pipeline may be involved in legal proceedings before various courts and periodically subject to governmental examinations (including by FERC), inquiries and investigations. Certain legal proceedings and governmental examinations involve demands for unspecified amounts of damages, that may be in an initial procedural phase, involve uncertainty as to the outcome of pending appeals or motions, or involve significant factual issues that need to be resolved, such that it is not possible for MountainWest Pipeline to estimate a range of possible loss. For such matters that MountainWest Pipeline cannot estimate, a statement to this effect is made in the description of the matter. Other matters may have progressed sufficiently through the litigation or investigative processes such that MountainWest Pipeline is able to estimate a range of possible loss. For legal proceedings and governmental examinations for which MountainWest Pipeline is able to reasonably estimate a range of possible losses, an estimated range of possible loss is provided, in excess of the accrued liability (if any) for such matters. Estimated ranges of loss are inclusive of legal fees and net of any anticipated insurance recoveries. Any estimated range is based on currently available information and involves elements of judgment and significant uncertainties. Any accrued liability is recorded on a gross basis with a receivable also recorded for any probable insurance recoveries. Any estimated range of possible loss may not represent MountainWest Pipeline’s maximum possible loss exposure. The circumstances of such legal proceedings and governmental examinations will change from time to time and actual results may vary significantly from the current estimate. Management does not anticipate that the liabilities, if any, arising from current proceedings would have a material effect on MountainWest Pipeline’s financial position, liquidity or results of operations</span><span style="color:#000000;font-family:'Times New Roman',serif;font-size:10pt;font-weight:400;line-height:112%">.</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note 6 - Transactions with Major Customers and Affiliates</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">MountainWest Pipeline provides service to approximately 60 customers, including storage customers, marketers or end-users, power generators, and utilities. The</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:12pt;font-weight:400;line-height:112%"> </span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">largest customer comprised approximately 42% and 41% of the total operating revenues for each of the years ended December 31, 2025 and 2024, respectively. </span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:112%">Affiliates</span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">Services necessary to operate the business are provided by Williams and certain affiliates of Williams. MountainWest Pipeline reimburses Williams and its affiliates for all direct and indirect expenses incurred or payments made (including salary, bonus, incentive compensation and benefits) in connection with these services. Employees of Williams also provide general, administrative and management services and MountainWest Pipeline is charged for certain administrative expenses incurred by Williams. These charges are either directly assigned or allocated. Allocated charges are specific or general. Specific allocations are based on a relationship with the delivery of services and general allocations are based on a three-factor formula, which considers net revenues; gross property, plant and equipment; and gross payroll. In addition, MountainWest Pipeline purchases transportation services from White River Hub. </span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">MountainWest Pipeline receivable and payable balances with affiliates are generally settled on a monthly basis, depending on the nature of the underlying transactions. MountainWest Pipeline is a participant in Williams’ cash management program and makes advances to and receives advances from Williams. These advances are represented by demand notes and are included in </span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:112%">Notes Receivable from Associated Companies</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%"> on the Comparative Balance Sheets. Advances are stated at the historical carrying amounts.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:66.459%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.822%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.824%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="text-align:center"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31,</span></div></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="9" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Notes Receivable from Associated Companies</span></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">90.2 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">59.7 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr></table></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">The interest rate on these intercompany demand notes is based upon the daily overnight investment rate paid on Williams’ excess cash at the end of each month, which was approximately 3.6% and 4.3% at December 31, 2025 and 2024, respectively. The interest income are included in </span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:112%">Interest and Dividend Income</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%"> in the Statements of Income.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:66.459%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.822%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.824%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="text-align:center"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31,</span></div></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="9" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Interest income from advances</span></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3.7 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2.6 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr></table></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">In addition to services received from affiliates, MountainWest Pipeline provides transportation and storage services to certain affiliates of Williams in the ordinary course of business under applicable tariff rates and contractual arrangements. MountainWest Pipeline also sells natural gas to affiliates of Williams pursuant to gas sale and purchase agreements. Revenues related to these affiliated transactions are included in </span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:112%">Gas Operating Revenues</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%"> in the Statements of Income.</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">The amounts of these services follow:</span></div><div style="text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:66.459%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.822%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.824%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="text-align:center"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31,</span></div></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="9" style="background-color:#cceeff;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Revenues received from affiliates</span></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">2.9 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.5 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr></table></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:112%">As of December 31, 2024, MountainWest Pipeline deemed $14.3 million of related party notes receivable as a distribution and reclassified the amounts to equity.</span></div><div style="margin-top:12pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note Receivable from Subsidiary and Interest Income</span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">MountainWest Pipeline loaned excess funds in the amount of $55.0 million to its subsidiary, MountainWest Overthrust Pipeline, LLC for year 2025 and 2024. The amount is recorded in </span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Investments in Subsidiaries </span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">in the Comparative Balance Sheet. Related interest income for 2025 and 2024 was $1.9 million and $1.9 million, respectively.</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note 7 - Credit Risk</span></div><div style="margin-top:12pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Credit risk is the risk of financial loss if counterparties fail to perform their contractual obligations. In order to minimize overall credit risk, credit policies are maintained, including the evaluation of counterparty financial condition. In addition, counterparties may make available collateral, including letters of credit, payment guarantees, or cash deposits</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Note 8 - Summary of Tracked Activities</span></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The following is a summary of tracked revenues and expenses:</span></div><div style="margin-top:10pt;text-align:justify"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:66.459%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.822%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.395%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:14.824%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">Year Ended December 31,</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2025</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">2024</span></td></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:center;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:8pt;font-weight:700;line-height:120%">(Millions)</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Annual Charges Adjustment (ACA):</span></td><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Revenue</span></td><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.7 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.7 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Expense</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:6.5pt;font-weight:400;line-height:120%;position:relative;top:-3.5pt;vertical-align:baseline"> (1)</span></div></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(0.7)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">(0.3)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">— </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">0.4 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:top"/></tr></table></div><div style="margin-top:10pt;text-align:justify"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">(1) The 2024 expense includes the reversal of a prior period entry for 2015-2021 that was underpaid to FERC.</span></div> MWPipelineSystemMap2025.pdf 2026-02-18 2025-12-29 C001088 2 MountainWest Pipeline, LLC 2025 Q4 650 South Main Street, Suite 300, Salt Lake City, UT 84101 Billeigh Mark Chief Accounting Officer P.O. Box 1396,Houston, Texas 77251-1396 713-215-2000 O 2026-04-13 Billeigh Mark Chief Accounting Officer Billeigh Mark 2026-04-13 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Not Prepared MountainWest Pipelines Holding LLC The Williams Companies, Inc. 1 2 D M DE DE 1.00 MountainWest Overthrust Pipeline, LLC White River Hub, LLC 1 2 MountainWest Field Services, LLC 3 MountainWest White River Hub, LLC 4 D J D D Transporter of Natural Gas Transporter of Natural Gas Natural Gas Processing Holding Company 1.00 0.50 1.00 1.00 1492491077 1460747037 14763979 13551060 1507255056 1474298097 809659742 770935376 697595314 703362721 697595314 703362721 104165979 104165979 6449906 5977604 -2743500 -3425500 398551007 351307077 398551007 351307077 3226550 4946421 19202647 21333324 4855344 3738591 90204819 59748243 2252408 299577 2628003 2747104 12958 1087177 1010649 1245852 1846546 2965263 11300150 127681021 106970605 2178125 2364293 28533452 30330977 1567226 1312226 -29151 -303440 6647076 4468582 22923251 20517449 61819979 58690087 1393519706 1327048573 814081974 814081974 71337800 47623692 -63460157 -102756711 821959617 758948955 430000000 430000000 1239322 1281998 428760678 428718002 11575154 10821100 11575154 10821100 5649550 5878780 7061881 8328624 3226550 4946421 4624807 6760732 4645833 4645833 2851597 4181843 28060218 34742233 12750648 4043951 1770283 2917261 60104396 65863913 21138539 13254426 7400173 7738732 103164039 93818283 1393519706 1327048573 196252789 195695808 196252789 195695808 72594092 76379801 72594092 76379801 8744341 7766814 8744341 7766814 44786736 43193931 44786736 43193931 155723 48723 155723 48723 1216279 1023724 1216279 1023724 2093753 3628978 2093753 3628978 3801806 1060783 3801806 1060783 7119847 7105196 7119847 7105196 5015220 -2917328 5015220 -2917328 1344642 -196184 1344642 -196184 9462639 17434046 9462639 17434046 6598156 5998088 6598156 5998088 754054 863560 754054 863560 142887364 147272390 142887364 147272390 53365425 48423418 53365425 48423418 50422596 48489525 5676757 4525035 500650 647046 56600003 53661606 81978 220507 80135 103494 26039 -7021573 188152 -6697572 1186652 2012473 1186652 2012473 55225199 58346705 19136652 19075139 228844 218098 5518 1199 8894 -24046 101884 124541 19278024 19145849 89312600 87624274 89312600 87624274 47623692 8488943 TOTAL Credits to Retained Earnings (Account 439) (footnote details) TOTAL Debits to Retained Earnings (Account 439) (footnote details) 4 5 38890004 39134749 TOTAL Appropriations of Retained Earnings (Account 436) (footnote details) TOTAL Dividends Declared-Preferred Stock (Account 437) (footnote details) TOTAL Dividends Declared-Common Stook (Account 438) (footnote details) Cash Distribution 12 12.1 Income Tax Distribution 12.2 36000000 -9698062 11126042 71337800 -151246236 11126042 Other Changes (Explain) 44942459 43242654 Amortization of (Specify) (footnote details) Amortization Expense - Utility Plant 5 5.1 Amortization of Regulatory Asset - Cash Flow Hedge Deferrals 5.2 Amortization of Debt Expense 5.3 Amortization of Discount on Long Term Debt 5.4 1216279 966652 186168 42676 1023724 905139 178136 39962 2864483 11435958 938907 6408241 -29615 -412189 -2988634 -4856994 -992811 -815258 -3646186 651560 500650 647046 47243930 43704719 Other (footnote details): Net (Gain) or Loss on Sale of Assets 16.01 16.02 Accretion 16.03 Gas Stored - Base Gas 16.04 System Balancing Gas 16.05 Gas Owed to System Gas 16.06 Special Deposits 16.07 Prepayments 16.08 Gas Imbalances 16.09 Miscellaneous Deferred Debits 16.10 Customer Deposits 16.11 Other Deferred Credits 16.12 Net Transportation and Exchange Receivable/Payable Imbalance 16.13 Clearing Account 16.14 OBA cashout settlement 16.15 Preliminary Survey and Investigation Charges (Gas) 16.16 754054 1719871 600694 -2413077 -1719871 -237394 4448387 -274289 825951 -255000 863560 13042 1558430 -1750278 -2472554 -1558414 -817887 -2380696 246018 -5188050 88684762 79225025 42054489 49993449 500650 647046 Other (footnote details): Net Retirements 27 27.1 3949371 5104074 45503210 54450477 30456576 29486253 -1607204 635722 Other (footnote details): Contributions and Advances for Construction Costs 47 47.01 15184166 4043951 -62382824 -79257057 Other (footnote details): Other (footnote details): Distribution to Willimas 65 65.1 26301938 -26301938 -32032 32032 1450762464 1450762464 41552889 41552889 1492315353 1492315353 175724 175724 14763979 1507255056 809659742 697595314 783780997 783780997 25878745 25878745 809659742 809659742 488600 488600 112859 112859 28509311 5147517 5076083 38732911 29110770 5147517 5076083 39334370 553685 -10195 543490 8037 8037 30785246 -1134647 158817 965306 30457088 60961846 5261413 194227 6049981 72079013 83639 83639 867529 867529 15206594 15206594 11101217 340022 9694 163116 11594661 91212571 9909502 236496 2712369 103597946 6793213 -135270 6657943 39552732 2986278 432366 -188658 41917986 4736195 714301 6326 -264022 5180148 5095645 5095645 266958149 18076869 1037926 9292627 293289719 266958149 18076869 1037926 9292627 293289719 651157 121590 124728 897475 8704255 1000 -114533 8590722 25561770 390960 21526 -138646 25792558 725069891 8371832 618502 -284657 732538564 245908484 21213042 11334445 -8104477 247682604 92397997 -4082079 136828 -98332 88080758 17081959 6954 1518 74814 17162209 1292009 1292009 4571383 3 4571386 1121238905 26023299 12112819 -8541100 1126608285 1017217 1017217 18577677 256589 -5827610 13006656 5818632 255881 332747 -1668121 4073645 8074674 913441 1306955 2294055 9975215 1252655 47824 595067 36172 741584 1934420 -22104 141111 -576381 1194824 6473851 -3202277 316593 2954981 114363 4494 118857 43263490 -1746152 2692473 -5741885 33082980 43263490 -1746152 2692473 -5741885 33082980 1460571313 47501533 15843218 85725 1492315353 1460571313 47501533 15843218 85725 1492315353 CMP - Buildings / Foundations /Utilities CMP - Other 1 2 CMP - Station Piping 3 Fleet Program 4 IMP - IMP Rehabilitation/Remediation 5 Kastler Replacement 6 MAOP - Integrity/Material Dig 7 MW IT Transition Prog 8 PIP - Rehabilitation/Remediation 9 Plant - Station Piping 10 Reimbursable Projects 11 STO - Clay Basin 12 TRB - Non-Emergency 13 Uinta Wax Receipt 14 Minor Projects 15 551814 31724 6289 4487 7815541 332135 2511928 481 1127143 2382437 639030 2528958 1050000 2869378 1165003 75100000 3065039 5791707 3720315 5474808 130499 505768 2664879 18604270 123309654 EAKIN COMPRESSOR UNIT #7 FIDLAR COMPRESSOR UNIT #3 1 2 ML 101 3 ML 104 4 OAK SPRING COMPRESSOR 5 ML 104 SOUTHERN SYSTEM EXPANSION 6 See Footnote See Footnote CP96-820 CP00-68 CP98-66 See Footnote AT RISK AT RISK AT RISK AT RISK AT RISK INCREMENTAL 5885336 1478649 14603164 103338514 9502535 176969935 4484566 1078877 12025008 64631016 6560552 81662484 210294 52835 521799 3692479 339543 6323468 4711 574 18681 41273 674153 925719 325 63544 177728 211348 53100 524413 3710980 341235 6354443 28262 7101 70126 496243 45632 849830 3870891 1369143 14444036 2003037 17368363 311778133 170442503 11140418 1665111 241597 11195519 1497194 39055470 430000000 MountainWest Pipeline, LLC 0.3617 0.0427 758948955 MountainWest Pipeline, LLC 0.6383 0.1175 Rate Case 1188948955 17282059 MountainWest Pipeline, LLC 0.0154 0.0750 0.0154 0.0750 746272910 746272910 44786736 44786736 155723 Other Clearing (Specify) (footnote details): 44942459 44942459 15843218 15843218 4200808 4200808 12585798 12585798 7458228 7458228 ARO Settlement Out of Retirement Work in Progress Account Allocation of Furniture and Equipment Depreciation to Capital 16.01 16.02 Other Debit or Credit Items 16.10 -23856 -23856 783780997 783780997 150387268 150387268 610851065 610851065 22542664 22542664 107728732 8706517 8376500 4901019 21984036 8234215 7694500 4824491 20753206 108959562 67678989 2633373 -775000 271276 69808638 1.5391 2.4493 3.5400 4.0076 1.5608 MountainWest Overthrust Pipeline, LLC (MWOT) - Unspecified Investments in Subsidiary Companies (1) MountainWest Overthrust Pipeline, LLC - Advance Fixed Rate Note - Advances, Note 1 2 MountainWest Field Services, LLC (MWFS) - Unspecified Investments in Subsidiary Companies (2) 3 MountainWest White River Hub, LLC (MWWRH) - Unspecified Investments in Subsidiary Companies (3) 4 1982-04-01 1999-08-22 2008-02-01 2028-02-01 265985903 55000000 15329981 14991193 48453390 -848549 2817755 -3178666 314439293 55000000 14481432 14630282 -3178666 1245852 ASC 740 Deferral - AFUDC Equity Interest Cash Flow Hedge 2 3 ISS Cash Out 4 Clay Basin Stipulation 5 — 23 Years — — FERC Accounting Guidance AI193-5-000, Accounting for Income Taxes — FERC GAS TARIFF PT. 1 GENERAL TERMS & CONDITIONS SECTION 12.7 FERC GAS TARIFF PT. 3 GENERAL TERMS & CONDITIONS SECTION 16.4 590402 28732194 3015 1005366 161938 65693 12899 681443 427 407.3/407.4 495 1032345 344 1686809 752340 27765542 15570 921973 2719498 Annual Charge Adjustment Contract Asset 1 2 Supense Projects 3 Miscellaneous 4 MountainWest 1996 Settlement Trust 5 491687 1895 3975000 714540 1918738 16379 235708 1325000 928 489.2 184 107 670322 949994 175847 235708 535905 968744 -157573 5300000 4210365 2031871 20517449 1133494 5652627 254 2113331 22923251 Other (Define) 20517449 1133494 5652627 2113331 22923251 Other (Specify) 1133494 5652627 2113331 16861636 931827 4645735 1736772 18838772 3655813 201667 1006892 376559 4084479 Increases (Decreases) from Sales of Donations Received from Stockholders Increases (Decreases) Due to Reductions in Par or Stated Value of Capital Stock Increases (Decreases) from Gain or Resale or Cancellation of Reacquired Capital Stock 814081974 FIT Stock Options Excercise Transtock Contribution 15 15.1 Capital Contribution 15.2 Return of Capital to Parent 15.3 Contributed Property 15.4 Increases (Decreases) Due to Miscellaneous Paid-In Capital 15.5 814081974 Increases (Decreases) in Other Paid-In Capital Account 224 - Note 4.875% Due 2041 Account 224 - Note 3.53% Due 2028 32 33 Account 224 - Note 3.91% Due 2038 34 2011-12-06 2018-01-31 2018-01-31 2041-12-01 2028-01-31 2038-01-31 180000000 100000000 150000000 0.04875 0.03530 0.03910 8775000 3530000 5865000 18170000 430000000 18170000 Account 181 - Note 4.875% Due 2041 Account 181 - Note 3.53% Due 2028 2 3 Account 181 - Note 3.91% Due 2038 4 TOTAL ACCOUNT 181 4.1 180000000 100000000 150000000 2019807 923015 923016 3865838 2011-12-06 2018-01-31 2018-01-31 2041-12-01 2028-01-31 2038-01-31 1360988 321189 682116 2364293 45305 100252 40611 186168 1315682 220937 641506 2178125 Discount on Long-Term Debt (Account 226) Account 226 - Note 4.875% Due 2041 11.1 11.2 TOTAL ACCOUNT 226 12 180000000 1902600 1902600 2011-12-06 2041-12-01 1281998 1281998 42676 42676 1239322 1239322 Contributions in Aid of Construction 15184166 15184166 Provision for Federal Income Taxes Book Depreciation And Amortization 10.01 10.02 Deferred State Income Taxes 10.03 Non-Deductible Expenses 10.04 Post Retirement Benefits 10.05 Asset Retirement Obligations 10.06 Tax Gain/Loss Sale of Assets 10.07 Reserves and Contingencies 10.08 Prepaids - General 10.09 Other 10.10 8555956 46158738 510395 330926 800000 754054 596719 1054458 556476 4 59317726 Equity AFUDC Equity Earnings 15.1 15.2 500650 50422596 50923246 Tax Depreciation and Amortization Tax Repairs Expense 20.1 20.2 Regulatory Liability - Cashout 20.3 Park and Loans 20.4 Deferred Revenue 20.5 Environmental Liabilties 20.6 Miscellaneous Liabilities - Transmission 20.7 70830180 7683310 538053 309800 184627 100530 3896651 83543151 29348095 Federal Tax at 21% Adjustment for Prior Year 30 31 Balance: Federal Income Tax 32 (Less) Amounts Charged to Other Income and Deductions 409.2 33 Amount Charged to Account 409.1 34 6163100 38771 6201871 1186651 5015220 Federal Income Federal Tax US Federal 2025 5139378 0 6201871 7970056 3371193 5015220 1186652 5139378 1.2 2 0 6201871 7970056 0 3371193 0 0 5015220 0 1186652 0 0 0 0 Colorado Income 3.1 Utah Income 3.2 State Tax State Tax Colorado Utah 2025 2025 1038923 75357 0 0 1253705 90937 1611143 116863 681485 49431 1253705 90937 0.0029 0.0406 1114280 4 0 1344642 1728006 0 730916 0 0 1344642 0 0 0 0 0 0 Colorado - Property 9.1 Utah - Property 9.2 Wyoming - Property 9.3 Property Tax Property Tax Property Tax Colorado Utah Wyoming 2025 2025 2025 489088 0 0 0 0 547083 4046820 536777 533280 4046820 536777 502891 0 547083 4046820 536777 489088 10 0 5130680 5116877 0 502891 0 0 5130680 0 0 0 0 0 0 Colorado - Use 15.1 Oklahoma - Use 15.2 Utah - Use 15.3 Wyoming - Use 15.4 Miscellaneous - Use 15.5 Sales And Use Tax Sales And Use Tax Sales And Use Tax Sales And Use Tax Sales And Use Tax Colorado Oklahoma Utah Wyoming N/A 2025 2025 2025 2025 2025 2739 0 7138 8109 0 0 0 5372 2 241319 133566 -1 4567 2 239089 134779 3544 0 9368 6896 -1 34905 0 0 0 0 0 5372 2 206414 133566 -1 17986 16 0 380258 378437 0 19807 0 0 34905 0 0 0 0 0 345353 District of Columbia Paid Family Leave 41.01 Federal Unemployment 41.02 Federal Medicare 41.03 FICA 41.04 Oregon - Oregon Workers Benefit Fund 41.05 Alabama - Unemployment 41.06 Arizona - Unemployment 41.07 Arkansas - Unemployment 41.08 Colorado - Unemployment 41.09 District of Columbia - Unemployment 41.10 Florida - Unemployment 41.11 Georgia - Unemployment 41.12 Illinois - Unemployment 41.13 Kansas - Unemployment 41.14 Louisiana - Unemployment 41.15 Massachusetts - Unemployment 41.16 Minnesota - Unemployment 41.17 Montana - Unemployment 41.18 New Mexico - Unemployment 41.19 New Jersey - Unemployment 41.20 New York - Unemployment 41.21 North Carolina - Unemployment 41.22 Ohio - Unemployment 41.23 Oklahoma - Unemployment 41.24 Oregon - Unemployment 41.25 Pennsylvania - Unemployment 41.26 South Carolina - Unemployment 41.27 Tennessee - Unemployment 41.28 Texas - Unemployment 41.29 Utah - Unemployment 41.30 Virginia - Unemployment 41.31 Washington - Unemployment 41.32 West Virginia - Unemployment 41.33 Wyoming - Unemployment 41.34 Washington Paid Family & Medical Leave 41.35 New Mexico - Workers Comp 41.36 Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax Payroll Tax District of Columbia Oregon Alabama Arizona Arkansas Colorado District of Columbia Florida Georgia Illinois Kansas Louisiana Massachusetts Minnesota Minnesota New Mexico New Jersey New York North Carolina Ohio Oklahoma Oregon Pennsylvania South Carolina Tennessee Texas Utah Virginia Washington West Virginia Wyoming Washington New Mexico 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 2025 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 220 9402 423351 1466427 1 0 19 10 1286 163 0 8 17 0 3 0 109 8 24 48 9 1 56 6479 8 615 12 0 2679 10804 47 384 40 22888 500 0 220 9402 423351 1466427 1 0 19 10 1286 163 0 8 17 0 3 0 109 8 24 48 9 1 56 6479 8 615 12 0 2679 10804 47 384 40 22888 500 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 220 9402 423351 1466427 1 0 19 10 1286 163 0 8 17 0 3 0 109 8 24 48 9 1 56 6479 8 615 12 0 2679 10804 47 384 40 22888 500 0 0 42 0 1945618 1945618 0 0 0 0 1945618 0 0 0 0 0 0 Property tax and other tax 45.1 Franchise tax 45.2 0 0 0 0 -24155 32799 -24155 32799 0 0 -24155 32799 0 46 0 8644 8644 0 0 0 0 8644 0 0 0 0 0 0 0 15011713 17147638 0 0 0 13479709 0 1186652 0 0 0 345353 Park and Loan Accrued Estimated Environmental Cost 1 3 Transportation and Exchange Gas Imbalance 5 675000 5000 2171597 General and Auto liability Contract Liability 1 3 Environmental Accrual 4 Escheatable Items 5 2802008 56149 59104 234/925 242/489.2/489.4/495 242/862 232 16529 4326585 12783 53705 16529 3232375 11254 2466 1707798 54620 7865 4409602 3262624 13254426 8293638 409525 21138539 Other (Define) 13254426 8293638 409525 21138539 Other (Specify) 8293638 409525 10892746 6815873 336556 17372063 2361680 1477765 72969 3766476 7738732 35507 536004 182.3 161938 7400173 Other (Define) 7738732 35507 536004 161938 7400173 Other (Specify) 35507 536004 161938 6359839 29179 440499 133084 6081603 1378893 6328 95505 28854 1318570 ASC 715 - PBOP Reserve Income Taxes Refundable Through Future Rates 1 2 Transmission Cash Out 4 Fuel Gas Reimbursement - Current 5 Fuel Gas Amortization - per: Jan-Dec 6 Overrun Revenue Sharing 7 ISS Revenue Sharing 8 Clay Basin Stipulation 9 PAL Revenue Sharing 11 20245697 39194741 748920 3262800 1407350 40605 565300 398500 411.1 407.3/407.4 407.3/407.4 407.3/407.4 489.2 407.3 495 407.3 2211236 760308 4254223 3379907 60383 599639 462751 662200 800000 97905 234809 1198095 1987648 71468 1142381 511841 586983 21045697 37081410 223421 206672 15091 51690 1108042 49090 323283 12390647 6631130 3687 8591 8591 1020000 4757420 4757420 T-1 T-1-SSXP 3 4 NNT 5 T-2 6 FP 7 27265050 6738883 839032 40760 10186 1267 9205802 1435327 180916 142517 9246562 1445513 180916 143784 29191105 6718738 744079 43877 10018 1092 9911884 1512415 180916 127932 660847 9955761 1522433 180916 129024 660847 34709755 7005982 1045324 52057 10570 1592 10786758 1881612 180916 184670 660847 10838815 1892182 180916 186262 660847 34842965 52213 10964562 11016775 36653922 54987 12393994 12448981 42761061 64219 13694803 13759022 PKS FSS 65 66 ISS 67 PAL1 68 3355 686383 76053 2 2342 616 553494 2536575 256118 222615 0 76 553494 2538917 256734 222615 150372 3657422 326817 2 1557 364 542022 2589688 332137 222614 0 542022 2591245 332501 222614 269744 10379781 280060 727287 1739 1346 549601 2702044 270305 222614 0 549601 2703783 271651 222614 765793 2958 3568802 3571760 4134613 1921 3686461 3688382 11656872 3085 3744564 3747649 59165 59165 92497 92497 97074 97074 4499 4499 4500 4500 425544 425544 354117 354117 1408838 1408838 484709 484709 451113 451113 1510412 1510412 35608758 55171 15018073 15073244 40792222 56908 16540159 16597067 55437933 67304 23707199 23774503 5253511 6118084 5253511 6118084 1148687 1337000 653926 649192 140468787 139722756 141122713 140371948 458928848 463708142 39030 30874 41656891 41637295 41695921 41668169 53693687 42777227 999445 841632 999445 841632 8999 8999 7172200 6695975 7172200 6695975 692956 680066 195559833 195015742 196252789 195695808 692956 680066 195559833 195015742 T-1 NNT 1 2 T-2 3 T-1-SSXP 4 FP 5 519001 17246 117679 513438 20703 115051 115851997 2170997 2058968 17743435 2643389 115800038 2170997 2463949 17158152 2129620 116370999 2170997 2076214 17861114 2643389 116313476 2170997 2484652 17273203 2129620 364203149 12131001 82594698 387071511 14787907 61848724 653926 649192 140468786 139722756 141122713 140371948 458928848 463708142 FSS PKS 1 2 ISS 3 PAL1 4 TOTAL 11 35434 3596 39030 29584 1289 30873 31362992 6551796 1560829 2181273 41656890 31072927 6481225 1175171 2907973 41637296 31398427 6551796 1564425 2181273 41695921 31102511 6481225 1176460 2907973 41668169 48293447 2629447 1362845 1407948 53693687 37452978 1562029 796668 2965552 42777227 296897 Other revenues (Specify): Clay Basin Stipulation 11 12 OBA Sales 13 PAL Fuel Revenue 14 Miscellaneous Revenue 15 3740120 2959088 100061 76034 7172200 Account 489.1, Revenues from transportation of gas of others through gathering facilities Account 489.2, Revenues from transportation of gas of others through transmission facilities 1 2 Account 489.4, Revenues from storing gas of others 3 Account 495, Other gas revenues 4 23108015 91630750 7465765 6551796 42454400 5295824 23108015 91630750 14017561 47750224 -30 57011 -1151 -1181 57011 -1181 57011 2324951 3025214 6019 2324951 3031233 4687040 -2501252 6005788 7327374 7304041 5659607 18371077 15725260 445280 297546 2302857 2271027 21119214 18293833 5941945 5247277 -9463531 -10848808 -9464712 -10791797 676452 494898 174169 195655 9853 19498 2528456 2982854 7445478 6134157 2620 78624 210816 204992 133108 17201 1019422 835619 12200374 10963498 40743 23860 50566 19918 107113 116512 20020 1136523 529219 14050 70935 117254 274266 59788 116542 1487905 1209404 13688279 12172902 13688279 12172902 1431464 1687121 355 2365 892556 431987 3317769 3819736 10952881 9591103 28838 12605177 13796651 854859 973334 7658674 7483818 1526565 2061593 259569 299732 39528707 40147440 256167 374912 225123 426592 3407232 2818917 1351129 1331145 853856 941138 133758 11139 1029171 653567 7256436 6557410 46785143 46704850 12022441 15358853 3752329 3773782 344627 359479 3507956 6242593 500026 631212 1863967 2043173 6102300 6305445 671862 320181 90416 125010 394686 225240 1768367 1394650 30329723 36060660 30329723 36060660 81338433 84146615 System Balancing Gas 10799295 4079663 6112255 2544464 10799295 4079663 6112255 2544464 810 6135600 811 149378 445280 812 Gas Used for Other Utility Operations - Credit (Report separately for each principal use. Group minor uses.) 812 664450 2302857 6949428 MountainWest Overthrust Pipeline, LLC White River Hub, LLC 1 2 Other 3 true false false 5974727 1683900 47 54395666 54395666 Lost & Unaccounted For Gas Cost of Gas Sold 1 2 PAL Fuel Expense 3 1223899 4620008 98038 63569 General Expense Allocation Miscellaneous 4 5 323241 7876 1216279 1216279 7937317 40787 7978104 33157305 114936 33272241 3692114 3692114 44786736 155723 1216279 46158738 278973 0.0300 1125369 0.0300 23060 0.0300 Intangible Electronic Flow Measurement 9 11 38733 824 0.2000 0.0833 425 - Miscellaneous Amortization 426.1 - Allocations 81978 426.2 - Life Insurance 426.4 - Allocations 426.4 - Lobbying Expense 22 23 66725 13410 426.5 - Project Writeoffs 426.5 - Other 27 28 93276 -67236 430.0 - Letters of Credit 5518 431.0 - Interest and Penalties 431.0 - Miscellaneous 37 38 204 8690 Federal Energy Regulatory Comission RM87-3 Other 1 2 670322 1540 670322 1540 — — 928.0 928.0 670322 1540 — — 671862 671862 671862 14766 3965 Chargeout of expenses Investment plus plan 5 6 Group insurance Plans 7 Benefit and payroll tax accrual 8 Corporate Benefits allocation 9 Other Employee Welfare Costs 10 Retirement Plan 11 -575773 1952264 2985865 29158 1315096 21379 355580 2098820 168221 2267041 9679883 339161 1174813 11193857 4733160 280024 6413656 11426840 16511863 787406 7588469 24887738 342095 19232 361327 2217908 244126 2462034 2560003 263358 2823361 2440915 187453 2628368 11897791 583287 1174813 13655891 4733160 280024 6413656 11426840 19071866 1050764 7588469 27711099 19071866 1050764 7588469 27711099 1171352 1311076 2482428 1171352 1311076 2482428 9624 50871 60495 9624 50871 60495 Other Accounts (Specify) Other Preliminary Survey and Investigation Charges (183.2) 75 75.01 Miscellaneous Deferred Debits (186) 75.02 Clearing Accounts (184) 75.03 Stock Amortizations (various operating accounts) 75.04 31545 6870 706041 54539 40 86084 6910 706041 744456 54579 799035 20997298 2467290 7588469 31053057 ALLEGIS GLOBAL SOLUTIONS INC AUDIE PRICE INSPECTION INC 1 2 BH INC 3 BWS INSPECTION SERVICES LLC 4 COASTAL CHEMICAL CO LLC 5 COOPER MACHINERY SERVICES LLC 6 D2 INTEGRITY LLC 7 FLARE CONSTRUCTION LLC 8 HANGING H COMPANIES LLC 9 INTEGRITY SPECIALISTS LLC 10 JP SERVICES 11 KATS SOLUTIONS LLC 12 KINLEY ADVANCED TECHNICAL SERVICES 13 M&M WELDING & CONSTRUCTION INC 14 ONSHORE QUALITY CONTROL SPECIALISTS LLC 15 PORTABLE MACHINE CASTING REPAIR OF OKLAHOMA LLC 16 QUORUM BUSINESS SOLUTIONS USA INC 17 ROSEN USA 18 SOLAR TURBINES INCORPORATED 19 TDW US INC 20 TIBERIUS ENERGY SERVICES LLC 21 WASATCH ELECTRIC LLC 22 WIRE BROTHERS INC 23 Others 24 806229 487999 963346 451236 706078 373765 321649 320040 1962117 449471 335288 657568 593198 6246240 471894 371000 850367 333798 1465534 350795 5745521 705695 4044606 7179793 36193227 Employee Payroll Employee Benefits and Taxes 2 3 Employee Charges 4 Direct Assignment Payroll, Benefits, and Taxes 5 Corporate Allocations 6 Fleet Allocations 7 Stock Based Compensation 8 Employee Stock Purchase Plan 9 Employee Charges 10 Contracted Services 11 Work Order Transfers 12 Inventory Transfers 13 Operating Area Allocations 14 Storage Facilities Allocations 15 Work Order Allocations 16 Fixed Asset Transfers 17 Contracted Services 18 Inventory Transfers 18.01 Cashout Activity 18.02 Work Order Transfers 18.03 Inventory Transfers 18.04 Transportation of Gas of Others Through Transmission Facilities 18.05 Rent Allocations 18.06 Software Allocations 18.07 Other 18.08 Work Order Transfers 18.09 Inventory Transfers 18.10 Williams WPC-1, LLC Williams WPC-1, LLC Williams WPC-1, LLC Williams WPC-1, LLC Williams Companies, Inc. Williams Companies, Inc. Williams Companies, Inc. Williams Companies, Inc. Williams Companies, Inc. Williams Companies, Inc. Williams Companies, Inc. Williams Companies, Inc. Williams Partners Operating LLC Williams Partners Operating LLC Williams Partners Operating LLC Williams Partners Operating LLC MountainWest Energy Services, LLC Williams Field Services Group, LLC Sequent Energy Management LLC MountainWest Overthrust Pipeline, LLC MountainWest Overthrust Pipeline, LLC MountainWest Overthrust Pipeline, LLC Transcontinental Gas Pipe Line Company, LLC Transcontinental Gas Pipe Line Company, LLC Transcontinental Gas Pipe Line Company, LLC Northwest Pipeline LLC Northwest Pipeline LLC 814,816,817,818,820,821,824,831,832,833,834,835,836,837,850,852,853,856,857,859,861,862,863,864,865,866,867,920 408.1,814,816,817,818,820,821,824,831,832,833,834,835,836,837,850,852,853,856,857,859,861,862,863,864,865,866,867,920,921,925,926 818,853 107,108,183.2,186,408.1,814,816,818,824,834,850,851,852,853,856,857,859,861,862,863,864,865,866,867,920,922,926 408.1,426.1,426.4,850,852,853,856,859,866,920,921,922,923,924,925,926,930.1,930.2,931 107 814,818,850,853,856,920 814,818,850,852,853,856,920 107,108,183.2,186,750,753,814,816,817,818,820,824,834,836,850,852,853,856,857,858,859,861,862,863,864,865,866,867,920,921,923,930.2 850,852,853,867,921 107 154,163,856 408.1,850,852,856,859,920,921,922,923,926,930.2,931 408.1,818,922,926 408.1,856,920,926 101, 108 856 154 803 107,419.1,432 154 858 107,931 107 408.1,920,921,926 419.1,432 154 23015601 12665530 104250 -1128972 14588460 19528 866415 110138 1915220 9900 312190 10520 585216 17100 8522 73129 454729 12963 88848 764 20 5974726 623903 5514 750 47 1786 60336797 Capital Workorder Overheads 21 Work Order Transfers 22 General and Administrative Allocations 23.1 Rent Allocations 23.2 Fixed Asset Transfers 23.3 Inventory Transfers 24 Rent Allocations 24.2 Capital Workorder Overheads 25.0 Inventory Transfers 26.0 Gas Sold 27 Transportation of Gas of Others Through Transmission Facilities 28.0 Storing Gas of Others 29.1 Interest on Borrowing 29.2 General and Administrative Allocations 30.0 Rent Allocations 30.1 Work Order Transfers 31.0 Inventory Transfers 32.0 Gas Sold 33.1 Transportation of Gas of Others Through Transmission Facilities 33.2 Rent Allocations 34.1 Inventory Transfers 34.2 Rent Allocations 35.1 Facility Rent 36.0 Inventory Transfers 37.0 Storing Gas of Others 38.0 Williams Companies, Inc. Williams Companies, Inc. Williams Partners Operating LLC Williams Partners Operating LLC Williams Partners Operating LLC Williams Partners Operating LLC Williams Field Services Group, LLC Williams Field Services Group, LLC Williams Field Services Group, LLC Sequent Energy Management LLC Sequent Energy Management LLC Sequent Energy Management LLC MountainWest Overthrust Pipeline, LLC MountainWest Overthrust Pipeline, LLC MountainWest Overthrust Pipeline, LLC MountainWest Overthrust Pipeline, LLC MountainWest Overthrust Pipeline, LLC MountainWest Overthrust Pipeline, LLC MountainWest Overthrust Pipeline, LLC Transcontinental Gas Pipe Line Company, LLC Transcontinental Gas Pipe Line Company, LLC Northwest Pipeline LLC Northwest Pipeline LLC Northwest Pipeline LLC Northwest Pipeline LLC 850,852,853,920 107, 108 408.1,426.4,814,850,852,853,856,857,859,861,862,863,864,865,866,867,920,921,922,923,925,926,928,930.2 931 101, 108 154 931 850,852,853,856,920 154 483 489.2 489.4 419 408.1,426.4,850,852,853,856,857,859,861,862,863,864,865,866,867,920,921,922,923,925,926,928,930.2 931 107, 419.1, 432 154, 163 483 489.2 931 856 931 493 154, 163 489.4 9598 181648 114497 216484 11258 2109 4318 50081 29956 1973100 41719 77229 1941500 5242263 152302 836984 108543 8591 651 115632 23 549496 9000 50481 797133 12524596 FIELD COMPRESSOR STATIONS: SUBTOTAL FIELD COMPRESSOR STATIONS 1 2 UNDERGROUND STORAGE COMPRESSOR STATIONS: 3 Utah - Cash (was Coalville) 4 Utah - Chalk Creek 5 Utah - Kastler 6 Utah - Clay Basin 7 Wyoming - Leroy 8 SUBTOTAL UNDERGROUND STORAGE COMPRESSOR STATIONS 9 TRANSMISSION COMPRESSOR STATIONS: 10 Colorado - Greasewood 11 Colorado - Skull Creek Dew Point 12 Utah - Blind Canyon 13 Utah - Fidlar 14 Utah - Oak Spring 15 Utah - Thistle Creek 16 Wyoming - Coleman 17 Wyoming - Eakin 18 Wyoming - Kanda 19 Wyoming - Nightingale 20 Wyoming - Simon 21.1 Wyoming - Skull Creek 21.2 SUBTOTAL TRANSMISSION COMPRESSOR STATIONS 22 OTHER COMPRESSOR STATIONS: 23 Field Compressor Stations Field Compressor Stations Underground Storage Compressor Stations Underground Storage Compressor Stations Underground Storage Compressor Stations Underground Storage Compressor Stations Underground Storage Compressor Stations Underground Storage Compressor Stations Underground Storage Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Transmission Compressor Stations Other Compressor Stations 1 1 8 1 1 12 2 2 4 3 2 2 5 4 3 1 2 30 1600 550 32500 1680 4000 40330 7050 11800 7900 21500 12500 7300 15925 7200 6000 4700 2660 104535 6636435 2522756 90492879 9070607 108722677 22458526 1867914 28464132 29916845 44484019 33118807 23994024 34634736 12662705 11947029 9370257 6895981 259814975 65225 23720 7108612 36835 183804 7418196 252920 94600 605566 926566 489763 1315900 835145 787200 6709 2544387 1153500 1940625 10952881 172630 64569 720558 2589644 117577 3664978 425796 935012 158057 389671 302766 351004 854766 372302 449411 260486 106477 63150 4668897 21390 7965 2378237 15146 59284 2482022 85651 30990 174780 311748 135087 441765 286091 268263 1982 863651 396028 657542 3653578 PT1080H PT1428H PT4939H PT1648H PT1152H PT10247H PT5612H PT6362H PT7999H PT3310H PT7965H PT7987H PT8269H PT1993H PT6576H PT8709H PT8622H PT14H PT73418H 1 1 4 1 1 1 1 2 2 3 1 1 3 3 1 1 2025-02-01 2025-01-16 2025-04-30 2025-04-30 2025-03-24 2025-01-14 2025-04-16 2025-01-27 2025-01-14 2025-01-27 2025-01-21 2025-01-13 2025-12-04 2025-03-31 2025-01-30 2025-01-30 2025-09-04 368537652 18371077 8333875 6135600 732928 1059123 1792051 914871 1963178 2878049 295568 2625892 2921460 924149 6426607 7350756 203503 9935204 10138707 370120 7044059 7414179 219607 6322226 6541833 186971 5043490 5230461 317933 5666840 5984773 536631 4194775 4731406 730591 2761355 3491946 1485159 3110773 4595932 6918031 56153522 63071553 747907 18871684 19619591 330657 10481268 10811925 1215180 2393518 3608698 210077 1952460 2162537 721332 130180 851512 347120 156697 503817 701872 410224 1112096 802205 1719562 2521767 414513 1020816 1435329 324861 765793 1090654 666706 4134613 4801319 214541 11656872 11871413 6696971 53693687 60390658 53898788 80203857 134102645 159728700 57 14 844046 2025-01-14 Colorado Transmission Lines Utah Transmission Lines 1 2 Wyoming Transmission Lines 3 CO UT WY Fully Owned and Operated by Respondent Fully Owned and Operated by Respondent Fully Owned and Operated by Respondent 173.3 996.0 692.9 1862.2 24 1862.2 56295 56295 598831 1586825 2185656 10116 37243 47359 Other (Describe) (footnote details) 13836 68700 82536 622783 1749063 2371846 296529 296529 Other (Describe) (footnote details) 14492 14492 311021 311021 16124 16124 Other (Describe) (footnote details) 16124 16124 146443 146443 1897249 2804645 4701894 49151 29481 78632 Other (Describe) (footnote details) -62896 176364 113468 1883504 3156933 5040437 857155 857155 1340 1340 Other (Describe) (footnote details) 109712 109712 968207 968207 8486 8486 Other (Describe) (footnote details) 8486 8486 Summit County, Utah Chalk Creek Storage 1 2 Summit County, Utah - 3 Coalville Storage 4 Uinta County, Wyoming 5 Leroy Storage Project 6 Daggett County, Utah 7 Clay Basin Storage 8 Underground Storage Underground Storage Underground Storage Underground Storage 36500 66500 76900 810000 13085478 25240504 35727784 218524064 false false false true MountainWest Pipeline, LLC 786223 120508 404533182 101560850 53689088 16557278 4079663 1846994 54395666 12697098 5773250 1061185 5826855 1335830 -739693 -183880 Other Receipts (Specify)(footnote details) 39574974 3557930 567919208 138553793 1148687 1023687 404360868 101503631 56153522 10066903 2544464 54567980 12754317 5867508 2441127 6135600 1607652 Other Deliveries and Gas Used for Other Operations 36841898 8979757 567620527 138377074 298681 176719 567919208 138553793 — — — — 50669 28189 183733 262591 146938 81748 532827 761513 — — — — 12409 141622 154031 35986 410704 446690 — — 50669 40598 325355 416622 146938 117734 943531 1208203 65134 36236 236187 337557 188888 105086 684941 978915 854 810 12409 141622 154031 35986 410704 446690 819 810 65134 48645 377809 491588 188888 141072 1095645 1425605 — — — — 8106 4510 29393 42009 23507 13078 85241 121826 821/856/857/859 811/812 — — — — — — 8106 4510 29393 42009 23507 13078 85241 121826 — — — — 9952 5537 36087 51576 28860 16056 104654 149570 813 812 — — — — — — 9952 5537 36087 51576 28860 16056 104654 149570 — — — — — — -32523 -18094 -117934 -168551 -94317 -52472 -342009 -488798 182.3/407.3 254/407.4 — — — — -32523 -18094 -117934 -168551 -94317 -52472 -342009 -488798 — — — — — — — — — — — — Gas to be received from shippers 32523 18094 117934 168551 94317 52472 342009 488798 182.3/407.3 254/407.4 32523 18094 117934 168551 94317 52472 342009 488798 114257948 114257948 58998 27617 193018 279633 270213 126484 884023 1280720 7789 156003 163792 35674 714493 750167 58998 35406 349021 443425 270213 162158 1598516 2030887 72772 34064 238079 344915 333296 156012 1090403 1579711 854 810 7789 156003 163792 35674 714493 750167 819 810 72772 41853 394082 508707 333296 191686 1804896 2329878 10300 4821 33696 48817 47172 22081 154329 223582 821/856/857/859 811/812 10300 4821 33696 48817 47172 22081 154329 223582 14351 6718 46951 68020 65729 30767 215036 311532 813 812 14351 6718 46951 68020 65729 30767 215036 311532 -38425 -17986 -125708 -182119 -175984 -82376 -575745 -834105 182.3/407.3 254/407.4 — — -38425 -17986 -125708 -182119 -175984 -82376 -575745 -834105 — — — — — — — — — — — — Gas to be received from shippers 38425 17986 125708 182119 175984 82376 575745 834105 182.3/407.3 254/407.4 38425 17986 125708 182119 175984 82376 575745 834105 56218 27897 237838 321953 199012 98755 841946 1139713 8726 223371 232097 30890 787756 818646 56218 36623 461209 554050 199012 129645 1629702 1958359 65526 32516 277218 375260 231963 115106 981351 1328420 854 810 8726 223371 232097 30890 787756 818646 819 810 65526 41242 500589 607357 231963 145996 1769107 2147066 8772 4353 37111 50236 31053 15409 131373 177835 821/856/857/859 811/812 8772 4353 37111 50236 31053 15409 131373 177835 9975 4949 42199 57123 37240 18480 157549 213269 813 812 9975 4949 42199 57123 37240 18480 157549 213269 -28055 -13921 -118690 -160666 -101244 -50240 -428327 -579811 182.3/407.3 254/407.4 — — -28055 -13921 -118690 -160666 -101244 -50240 -428327 -579811 — — — — — — — — — — — — Gas to be received from shippers 28055 13921 118690 160666 101244 50240 428327 579811 182.3/407.3 254/407.4 28055 13921 118690 160666 101244 50240 428327 579811 The Workiva Platform

MountainWest Pipeline, LLC is indirectly owned by the The Williams Companies, Inc. through Williams Partners Operating LLC which directly owns MountainWest Pipelines Holding LLC.

White River Hub, LLC is owned 50% by MountainWest White River Hub, LLC and 50% by Enterprise White River Hub, LLC.

Dockets CP91-2021 / CP97-49

Dockets CP95-115 / CP97-49

CP05-5 / CP07-25.

Reconciliation of Plant & Provision Accounts:

Includes Book Cost of Plant Retired - 101 (pg 209 line 129, col. d)			$	15,843,220.00

Inventory in account 117.1 represents the balance of recoverable gas volumes that are necessary to maintain pressure and deliverability requirements for MountainWest Pipeline’s storage facilities. Recoverable base gas is reported under the inventory method.

Inventory in account 117.2 represents the balance of system balancing gas volumes for load balancing, no notice transportation, and other operational purposes. System balancing gas is reported under the inventory method.

Inventory in account 117.4 represents volumes owed to the system and volumes lent to the system in a park and loan agreement, reported at market (estimated replacement) value.

Inventory in account 164.1 represents the balance of pipeline owned gas which the pipeline intends to sell. Pipeline owned gas is reported under the inventory method.

Description			2025
Equity Earnings from 100% of MWOT's Net Income			$	48,453,390

Description			2025
Equity Earnings from 100% of MWFS's Net Loss			$	848,549

Description			2025
Equity Earnings from 50% of WRH's Net Income			$	2,817,755

Description			2025
Distribution to Parent			$	(3,178,666)

CTD DESCRIPTION			DEFERRED TAX ACCOUNT			12/31/2025 Balance
PROPERTY, PLANT, & EQUIPMENT			190			5,053,341
REGULATORY LIABILITIES			190			14,443,975
ENVIRONMENTAL LIABILITIES			190			14,571
OTHER ACCRUED LIABILITIES			190			3,411,363
190 TOTAL						22,923,251

Account Description			2025
Total of Accounts 427 on Page 116			$	19,136,652
427 Less: Amortization of Cash Flow Hedge Deferrals related to notes in Acct. 224			(966,652)
			$	18,170,000

(a) Use tax is distributed to various accounts based on the accounts coded on the originating invoice.

CTD DESCRIPTION			DEFERRED TAX ACCOUNT			12/31/2025 Balance
PROPERTY, PLANT, & EQUIPMENT			282			21,138,539
282 TOTAL						21,138,539

CTD DESCRIPTION			DEFERRED TAX ACCOUNT			12/31/2025 Balance
REGULATORY ASSETS			283			6,727,943
DEFERRED CHARGES & OTHER ASSETS			283			672,230
283 TOTAL						7,400,173

Docket RP95-407

Balance reflects MountainWest Pipeline’s excess deferred income taxes (EDIT) resulting in the reduction in the federal corporate income tax rate under Tax Cuts and Jobs Act of 2017 (TCJA).

FERC GAS TARIFF PT. 1 GENERAL TERMS & CONDITIONS SECTION 12.7.

FERC GAS TARIFF PT. 1 GENERAL TERMS & CONDITIONS SECTION 12.15

FERC GAS TARIFF PT. 1 GENERAL TERMS & CONDITIONS SECTION 12.15

FERC GAS TARIFF PT. 1 GENERAL TERMS & CONDITIONS SECTION 1

FERC GAS TARIFF PT. 3 GENERAL TERMS & CONDITIONS SECTION 17

FERC GAS TARIFF PT. 3 GENERAL TERMS & CONDITIONS SECTION 16.4

FERC GAS TARIFF PT. 3 GENERAL TERMS & CONDITIONS SECTION 10.9

FERC GAS TARIFF PT. 3 GENERAL TERMS & CONDITIONS SECTION 17

In addition to the reported withdrawal volumes, there were 56,153,522 Dth injection volumes.

In addition to the reported withdrawal volumes, there were 43,613,540 Dth injection volumes.

PAL1 Daily Revenue - Account 489.4			$	2,116,772
PAL1 Delivery Revenue - Account 489.4			64,501
Total PAL1 Revenue			$	2,181,273

Peaking Storage Service Revenue:
Reservation Revenue			$	6,366,792
Withdrawal Revenue			92,206
Injection Revenue			92,798
			$	6,551,796

Peaking Storage Service Volumes:
			Dth
Withdrawal Volumes			2,629,447
Injection Volumes			2,666,377
			5,295,824

Delivery Points:

MAP 176 - ROBERSON CREEK

MAP 281 - KANDA COL OTPL DEL

MAP 384 - EAKIN TO OTPL

MAP 388 - ROBERSON THRU KANDA

MAP 868 - XO-16 NWP DELIVERY

MAP 390 - OVERTHRUST 121/KRGT PAINTER FROM QPC

MAP 345 - KEMMERER GATE TO OTP

MAP 389 - HAMS FORK FROM QPC

MAP 207 - NAUGHTON

MAP 425 - BELL BUTTE STORAGE INJECTION VIA DEOP

MAP 424 - RUBY FROM QPC

MAP 445 – WARMSUTTER M&R FROM DEQP

Receipt Points:

MAP 285 - OVERTHRUST JL 36 MS

MAP 387 - OTPL TO QPC EAKIN

MAP 427 - WIC WAMSUTTER TO QPC

MAP 428 - OPAL PLANT TO QPC/WTNY

MAP 429 - OPAL PLANT TO QPC/EAKIN

MAP 430 - PIONEER PLT TO QPC/WTNY

MAP 431 – PIONEER PLT TO QPC/EAKIN

MAP 432 – WARMSUTTER (REC) TO QPC

MAP 433 – WIC RS TO QPC

MAP 434 – GRANGER OTPL TO QPC/WHITNEY

MAP 869 - OTPL TO QPC XO16

Delivery Points:

MAP 410 – WHITE RIVER HUB

Receipts Points:

MAP 409 – WHITE RIVER HUB

Underground Storage rates for lines 4 are based on the respective depreciable lives.

Transmission Plant rates for lines 7 & 10 are based on the respective depreciable lives.

General Plant rates for line 8 are based on the respective depreciable lives.

Intangible rate for line 9 is based on a 5-year depreciable basis.

Enterprise shared service costs are allocated to franchises via specific or general methods. Specific allocations are based on metrics that bear a reasonable correlation to the delivery of services, for instance some human resource services costs are allocated based on employee headcount. General allocations are based on "Modified Massachusetts" formula (MMF) which is determined by the proportion of three components: net revenues; gross property, plant and equipment; and gross payroll.

Enterprise shared service costs for fleet leasing and other fleet costs are allocated to franchises via specific allocations based on labor costs assigned to capital work orders.

Payroll and non-payroll charges for the benefit of the operating area that are not specific to a franchise are allocated to franchises in the operating area via specific or general methods. Specific allocations are based on metrics that bear a reasonable correlation to the delivery of services, for instance some human resource services costs are allocated based on employee headcount. General allocations are based on "Modified Massachusetts" formula (MMF) which is determined by the proportion of three components: net revenues; gross property, plant and equipment; and gross payroll. Storage facilities charges recorded to a specific work order for the benefit of the storage facilities within Transmission, Power & Gulf Operating Area that are not specific to a franchise are allocated to franchises included in the operating area via specific allocations primarily based on labor costs.

Employees' direct assignment payroll and non-payroll charges recorded to a specific work order for the benefit of the Transmission, Power & Gulf Operating Area that are not specific to a franchise are allocated to franchises included in the operating area via general allocations based on "Modified Massachusetts" formula (MMF).

Houston, Texas Williams tower building rent is allocated based on employee labor hours. Common systems hardware and software costs are allocated via general allocations using "Modified Massachusetts" formula (MMF). MountainWest shared services costs are allocated to MountainWest Pipeline, LLC, MountainWest Overthrust Pipeline, LLC, White River Hub, LLC, and nonregulated companies via specific allocations for pipeline companies based on miles of pipe and general allocations for the other companies based on "Modified Massachusetts" formula (MMF).

Salt Lake City, Utah building rent is allocated based on employee labor hours.

Salt Lake City, Utah building rent is allocated based on employee labor hours.

MountainWest shared services costs are allocated to MountainWest Pipeline, LLC, MountainWest Overthrust Pipeline, LLC, White River Hub, LLC, and nonregulated companies via specific allocations for pipeline companies based on miles of pipe and general allocations for the other companies based on "Modified Massachusetts" formula (MMF).

Salt Lake City, Utah building rent is allocated based on employee labor hours.

Salt Lake City, Utah building rent is allocated based on employee labor hours.

Salt Lake City, Utah building rent is allocated based on employee labor hours.

Dth calculated using the 1.065 Mcf/Dth conversion factor. Applied to line 2, 3, 4 & 7 also.

Operator Balancing Agreement allocations

Peaking Storage

Operator Balancing Agreement allocations

Peaking Storage

Max deliverability for Chalk Creek assumes a BTU conversion of 1,044 BTU/SCF and a max rate of 35 MMscfd.

Max deliverability for Coalville assumes a BTU conversion of 1,024 BTU/SCF and a max rate of 65 MMscfd.

Max deliverability for Leroy assumes a BTU conversion of 1,026 BTU/SCF and a max rate of 75 MMscfd.

Max deliverability for Clay Basin assumes a BTU conversion of 1,065 BTU/SCF and a max rate of 765 MMscfd as limited by dehydration units.

Footnote to Instruction 5:

Mountain West Pipeline, LLC does not bundle Sales and Transportation Services.

Footnote to Instruction 7:

All quantities of gas were subject to Commission regulation.

Footnote to Instruction 9:

Mountain West Pipeline had the following storage quantities at 12/31/25:

Clay Basin Storage						Dth
Contract Storage						46,381,167
System Balancing Gas						2,633,373
Gas for Future Sale or Transportation						271,276
						49,285,816
Leroy Peaking Storage						Dth
Contract Storage						698,573
Coalville Peaking Storage						Dth
Contract Storage						578,352
Chalk Creek Peaking Storage						Dth
Contract Storage						271,891

This amount has been reduced by the quantity of “Receipts of Respondent’s Gas Transported by Others” (Line 11). Applies to column (d) also.

This amount does not include System Balancing Gas withdrawals reported on Line 12, or 137,498 Dth of Gas Received for Fuel which is reported on Line 13.

This amount does not include System Balancing Gas withdrawals reported on Line 12, or 24,415 Dth of Gas Received for Fuel which is reported on Line 13.

System Balancing Gas withdrawals. Applies to column (d) also.

Other Receipts Includes:

			Dth
Change in storage Inventory			39,574,974
Operational Gas			-
			39,574,974

Other Receipts Includes:

			Dth
Change in storage Inventory			3,557,930
Operational Gas			-
			3,557,930

This amount has been reduced by the quantity of “Deliveries of Gas to Others for Transportation” (Line 26). Applies to column (d) also.

There were 56,153,522 Dth of natural gas received into underground storage as reported on line 14 of page 512, gas of others received for contract storage. Pursuant to section 4(f) of Rate Schedule FSS and Section 3(d) of respondent’s FERC Gas Tariff, First Revised Volume No.1, ACA is only applicable to 30,270,153 Dth of gas transported to storage by Northwest Pipeline Corporation.

The total volume subject to ACA
						Dth
Deliveries of Gas Transported for Others (Account 489.2)			P.520,Line20			404,360,868
Deliveries of Gas to Others for Transportation (Account 858)			P.520 Line26			54,567,980
Gas Transported to Storage by Northwest Pipeline Corporation						30,270,153
						489,199,001

System Balancing Gas injections. Applies to column (d) also

Other Deliveries includes:
			Dth
Change in Storage Inventory			36,326,751
M&R, Mains, & Misc. Fuel			515,147
			36,841,898

Other Deliveries includes:
			Dth
Change in Storage Inventory			8,838,695
M&R, Mains, & Misc. Fuel			141,062
			8,979,757

Allocation method was based on throughput. Applies to lines 11, 18, and 26 also.

Shipper Supplied Gas, Gas Consumed in Pipeline Operations, and Net Excess or (Deficiency) balances are valued based on the "Inside FERC’s Gas Market Report" first-of-the-month posting for Northwest Pipeline Corp., Rocky Mountains, published for the first of the month following gas flow. Applies to lines 6, 11, 13, 18, and 26 also.

In accordance with FERC Order No. 581, Shipper Supplied Gas is not directly charged to an account. Any excess or deficiency in net Shipper Supplied Gas (line 37) is recorded as “Other Regulatory Assets/Liabilities” (Accounts 182.3 / 254) with offsetting entries booked to “Regulatory Debits/Credits”, (Accounts 407.3 / .4). Applies to months 2 & 3 also.

Allocation method was based on actual gas supplied and used. Applies to Line 13 also.

In accordance with FERC Order No. 581, Shipper Supplied Gas is not directly charged to an account.Applies to months 2 & 3 also.

Gas used for M&R Fuel, Mains Fuel, and other Operational Fuel. Applies to all other columns on this line.

“Net excess or (deficiency)” balances are refunded or collected in-kind through MountainWest Pipeline, LLC’s annual Fuel Gas Reimbursement and Tracking provision (§12.15) of the General Terms and Conditions of Part I of MountainWest Pipeline, LLC's FERC Gas Tariff. Applies to months 2 & 3 also.