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C001789 Projects & Studies Prepaid by Customers (Montana) 2021-12-31 C001789 Public Service Company of Colorado WAPA PPW NF MONTANA OATT CROSSOVER YTP 2022-01-012022-12-31 C001789 Avista NF 2022-01-012022-12-31 C001789 ferc:NitrogenOxideMember Allowances Used 2022-01-012022-12-31 C001789 Federal Income Tax, Income Tax, Montana, 2022 2021-12-31 C001789 Codington Clark Electric (SOUTH DAKOTA PURCHASES), OS, 2022-01-012022-12-31 C001789 ferc:ElectricUtilityMemberferc:PenaltyTaxMember 2022-01-012022-12-31 C001789 ferc:OtherLicenseAndFeesTaxMember 2022-01-012022-12-31 C001789 Mobile 8 2022-01-012022-12-31 C001789 Aberdeen (NW CC) (SD), Distribution, Unattended 2022-01-012022-12-31 C001789 2021-01-012021-12-31 C001789 Regulatory Asset/Liability 2022-01-012022-12-31 C001789 East Helena Switchyard A (HELENA), Distribution, Unattended 2022-12-31 C001789 NATURENER GLACIER WIND, LF, Reserve Energy 2022-01-012022-12-31 C001789 Bellrock (BILLINGS), Distribution, Unattended 2022-12-31 C001789 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BPAT NWMT NF MONTANA OATT BPAT.NWMT MATL.NWMT 2022-01-012022-12-31 C001789 Colstrip 4 2022-12-31 C001789 Morgan Stanley Capital Group, Inc. WAPA PPW NF MONTANA OATT GREATFALLS BRDY 2022-01-012022-12-31 C001789 ferc:ElectricUtilityMemberferc:OtherAllocatedTaxMember 2022-01-012022-12-31 C001789 Annual Charges Under the Omnibus 2022-01-012022-12-31 C001789 Yankton SE (SD), Distribution, Unattended 2022-12-31 C001789 Billings City (BILLINGS), Distribution, Unattended 2022-12-31 C001789 Morgan Stanley Capital Group, Inc. 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PPW AVA NF MONTANA OATT YTP AVAT.NWMT 2022-01-012022-12-31 C001789 Mobile 7 2022-01-012022-12-31 C001789 Billings Shiloh Road (BILLINGS), Distribution, Unattended 2022-12-31 C001789 ferc:ExciseTaxMember 2022-12-31 C001789 Western Energy Armells Creek (BILLINGS), Distribution, Unattended 2022-12-31 C001789 NorthWestern Energy Solutions - Equity in Undistributed Earningsferc:UnappriatedUndistributedSubsidiaryEarningsMember 2022-12-31 C001789 ferc:FederalInsuranceTaxMember 2021-12-31 C001789 Aberdeen #2 2022-01-012022-12-31 C001789 Boulder Auto (HELENA), Transmission, Unattended 2022-01-012022-12-31 C001789 Harlem (HAVRE), Transmission, Unattended 2022-12-31 C001789 Assiniboine-Havre (HAVRE), Transmission, Unattended 2022-01-012022-12-31 C001789 Garnell Pipeline (BILLINGS), Distribution, Unattended 2022-12-31 C001789 RIMROCK SUB REBUILD 2022-01-012022-12-31 C001789 South Dakota Operations 2022-01-012022-12-31 C001789 ferc:ElectricUtilityMemberferc:ExciseTaxMember 2022-01-012022-12-31 C001789 Vitol Inc. 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AVA AVA NF MONTANA OATT COLSTRIP AVAT.NWMT 2022-01-012022-12-31 C001789 ferc:ElectricUtilityMember Property Tax, Property Tax, Iowa, 2021 2022-01-012022-12-31 C001789 The Energy Authority, Inc. , SF, Market-Based Rate 2022-01-012022-12-31 C001789 Billings Conoco (BILLINGS), Distribution, Unattended 2022-01-012022-12-31 C001789 Property Tax, Property Tax, South Dakota, 2022 2022-12-31 C001789 Basin Electric Power Cooperative PPW WAPA NF MONTANA OATT YTP GREATFALLS 2022-01-012022-12-31 C001789 EDF Trading North America, LLC NWMT PPW NF MONTANA OATT COLSTRIP YTP 2022-01-012022-12-31 C001789 Kent T. Larson 2022-01-012022-12-31 C001789 Tripp Jct. (SD), Transmission, Unattended 2022-12-31 C001789 MRES (SOUTH DAKOTA PURCHASES), OS, 2022-01-012022-12-31 C001789 Plains (MISSOULA), Distribution, Unattended 2022-12-31 C001789 The Energy Authority WAPA PPW NF MONTANA OATT CROSSOVER BRDY 2022-01-012022-12-31 C001789 Shell Energy North America NWMT BPAT SFP MONTANA OATT COLSTRIP BPAT.NWMT 2022-01-012022-12-31 C001789 MAG Energy Solutions NWMT PACE NF MONTANA OATT MATL.NWMT BRDY 2022-01-012022-12-31 C001789 Morgan Stanley Capital Group, Inc. BPAT PPW SFP MONTANA OATT BPAT.NWMT BRDY 2022-01-012022-12-31 C001789 Macquarie Energy, LLC PPW AVA SFP MONTANA OATT BRDY AVAT.NWMT 2022-01-012022-12-31 C001789 Oil Neal 2022-01-012022-12-31 C001789 Sarpy Creek Auto (BILLINGS), Distribution, Unattended 2022-12-31 C001789 Great Falls Riverview (GREAT FALLS), Distribution, Unattended 2022-12-31 C001789 Columbus-Rajelje Auto (BILLINGS), Transmission, Unattended 2022-01-012022-12-31 C001789 ScheduleAccumulatedDeferredIncomeTaxesAcceleratedAmortizationPropertyAbstract 2022-01-012022-12-31 C001789 Lake 2022-01-012022-12-31 C001789 State Unemployment Tax, Unemployment Tax, South Dakota, 2021 2021-12-31 C001789 Beethoven Wind 2022-12-31 C001789 Dillon-Salmon (BUTTE), Transmission, Unattended 2022-01-012022-12-31 C001789 Morgan Stanley Capital Group, Inc. NWMT AVA NF MONTANA OATT MATL.NWMT AVAT.NWMT 2022-01-012022-12-31 C001789 FAS 112 (Montana) - Docket 93.6.24 and Docket 2009.9.129 2022-01-012022-12-31 C001789 Senior Unsecured Revolving Line of Credit ($25m) 2022-01-012022-12-31 C001789 Hardin Auto B (BILLINGS), Transmission, Unattended 2022-12-31 C001789 Morgan Stanley Capital Group, Inc. GWA BPAT NF MONTANA OATT GLWND2 BPAT.NWMT 2022-01-012022-12-31 C001789 Kerr, Anaconda B, Wood H Frame, 556.5 MCM ACSR 2022-01-012022-12-31 C001789 Macquarie Energy, LLC PPW NWMT SFP MONTANA OATT BRDY NWMT.SYSTEM 2022-01-012022-12-31 C001789 Delaware Franchise Tax, Franchise Tax, Montana, 2022 2021-12-31 C001789 Coyote Other 2022-01-012022-12-31 C001789 Brookfield Renewable Trading and Marketing LP BPAT WAPA NF MONTANA OATT BPAT.NWMT CROSSOVER 2022-01-012022-12-31 C001789 ferc:ElectricUtilityMember Billings Div Elec-Cap Blnkt Growth 2022-01-012022-12-31 C001789 Macquarie Energy, LLC NWMT PPW SFP MONTANA OATT COLSTRIP YTP 2022-01-012022-12-31 C001789 Portland General Electric Company NWMT BPAT NF MONTANA OATT COLSTRIP BPAT.NWMT 2022-01-012022-12-31 C001789 Guzman Energy, LLC BPAT PPW NF MONTANA OATT BPAT.NWMT BRDY 2022-01-012022-12-31 C001789 Seattle City Light NF 2022-01-012022-12-31 C001789 EDF Trading North America, LLC NWMT AVA NF MONTANA OATT COLSTRIP AVAT.NWMT 2022-01-012022-12-31 C001789 ferc:OtherInvestmentsInSubsidiaryCompaniesMember Canadian Montana Pipeline Corporation - Translation Adjustment 2022-12-31 C001789 Common Stock (NASDQ) 2022-01-012022-12-31 C001789 SD 14 Resid Space Htg 2 Meters 2022-01-012022-12-31 C001789 Unamortized Debt Expense (Corporate) 2022-01-012022-12-31 C001789 All 100 kV, , Various, 2022-01-012022-12-31 C001789 Dynasty Power Inc. WAPA PPW NF MONTANA OATT CROSSOVER YTP 2022-01-012022-12-31 C001789 Atlas Power, LLC Portland General Electric Atlas Power, LLC FNO Montana OATT Colstrip Butte, MT 2022-01-012022-12-31 C001789 Bonneville Power Admin OLF 2022-01-012022-12-31 C001789 Pension/Postretirement Benefitsferc:ElectricUtilityMember 2021-12-31 C001789 Huron Gas Turbine Plant C (SD), Transmission, Unattended 2022-01-012022-12-31 C001789 Energy Keepers Inc. PPW PPW NF MONTANA OATT YTP BRDY 2022-01-012022-12-31 C001789 Montana One (BILLINGS), Transmission, Unattended 2022-01-012022-12-31 C001789 Natural Gas Regulatory Deferrals (Montana) 2021-12-31 C001789 Morgan Stanley Capital Group, Inc. GWA NWMT NF MONTANA OATT GLWND1 MATL.NWMT 2022-01-012022-12-31 C001789 ferc:GasUtilityMember Pension/Postretirement Benefits 2022-12-31 C001789 Aberdeen Siebrecht A (SD), Transmission, Unattended 2022-01-012022-12-31 C001789 Bozeman Riverside (BOZEMAN), Distribution, Unattended 2022-01-012022-12-31 C001789 State Unemployment Tax, Unemployment Tax, Montana, 2022 2021-12-31 C001789 Morgan Stanley Capital Group, Inc. GWA NWMT NF MONTANA OATT GLWND1 NWMT.SYSTEM 2022-01-012022-12-31 C001789 2188, Black Eagle 2022-12-31 C001789 ferc:GeneralPlantMemberferc:ElectricUtilityMember 2022-01-012022-12-31 C001789 Consumer Counsel, Other Taxes, Montana, 2022 2022-12-31 C001789 NorthWestern Energy Solutions - Capital Stockferc:CaptialStockMember 2021-12-31 C001789 Butte Cora (BUTTE), Distribution, Unattended 2022-01-012022-12-31 C001789 Mobile 3 2022-01-012022-12-31 C001789 Guzman Energy, LLC AVA PPW SFP MONTANA OATT AVAT.NWMT YTP 2022-01-012022-12-31 C001789 Bozeman Westside (BOZEMAN), Distribution, Unattended 2022-12-31 C001789 ferc:OtherUseTaxMember 2022-12-31 C001789 Energy Keepers Inc. NWMT BPAT NF MONTANA OATT KERR BPAT.NWMT 2022-01-012022-12-31