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Operations34.51434.51534.51634.5171434.51834.51934.52034.521South Dakota Operations34.52234.5231034.52434.52515.011334.52615.02434.52715.03534.529634.530734.5312.002.01834.532122.02934.53440.01612.031034.53540.01622.041134.5362.051234.53740.01632.061334.5402.071440.01642.0840.01652.0913.012.1040.016613.022.1113.032.1240.016713.04162.1313.0540.01682.1413.062.1540.016913.072.1613.082.1740.01702.1840.01712.192.2040.017217.12.2117.2340.0173440.017440.01755640.017640.017740.017840.017940.018040.01811840.018234.024940.00042334.025102.0110440.000534.02651134.0271140.0006634.02812734.0291240.0007834.0301313940.000834.0311434.0321440.000934.0331534.0341540.001034.035161640.001134.036true1734.0371740.0012134.038218234.0391840.00133334.040191940.001434.041442034.04220540.0015534.04321634.0442140.001634.0457222240.001734.046686.012334.0472340.0018true96.0234.048246.0334.049241040.001916.0434.050252112540.00206.0534.051266.0634.0522640.00216.0734.053276.0834.0542740.00226.0934.055282840.00236.1034.05629734.0572940.00247.0134.058307.0234.0593040.002534.060313140.002634.0613234.0623240.002734.0633334.0643340.002834.065343440.002934.0663534.0673540.003034.06836false34.06940.0031134.070376240.003234.071738034.0723840.00330034.073903904034.07440.0034100C001789034.0754005040.0035034.076034.077640.0036034.078734.07940.0037134.080840.0038234.081O34.0829340.003934.083434.08440.00401134.08511.01534.0861234.087634.088734.08934.090Copies Submitted834.0911234.09234.29640.014334.09334.29740.014434.09434.29834.09534.2993240.014534.09634.30034.09734.30140.0146112034.09834.3021240.014734.09934.3031334.10034.3046740.01486811434.10134.305234.10234.30640.0149334.10334.3073440.015034.10434.308534.10534.309640.01512234.10634.31077791034.10734.31140.015234.10834.3121140.015334.10934.31334.11034.31440.015434.11134.3153634.11234.31640.015534.11334.31740.01562434.11434.31834.11534.31940.015734.11634.32034.11734.32140.015834.11834.3223440.015934.11934.3233834.12034.32440.016034.12134.32525.134.12234.32625.234.12334.32740.012134.12434.32840.0241111234.12534.32940.012234.12634.33040.024234.12734.3314040.012340.024334.12834.33240.012434.12934.33340.024434.13034.33440.012540.024534.13134.33534.13234.33640.012640.024634.13334.33740.012734.13434.33840.024734.13534.3394240.01282634.13634.34040.024834.13734.34140.012940.024934.13834.34240.013034.13934.34340.025077178234.14034.34440.013134.14134.34540.025179334.14234.3468440.0132440.025234.14334.3474485540.013327.234.14434.348640.025334.14534.349740.013434.14634.35040.025482834.14734.35140.0135940.025534.14834.3521040.013634.14934.3531140.025634.15034.35440.013734.15134.3554634.15234.35640.013834.15334.357740.013934.15434.35883034.15534.359Wdesk from Workiva40.014034.15634.36034.15734.36140.014134.15834.36240.014234.15934.3634834.36434.36534.36634.36734.36812134.369334.3703434.371450534.3725634.3736734.3747834.3758934.37691034.377101134.378111234.37912521334.380131434.381141534.382151614.00134.383161814.00234.384172014.00334.385182114.00434.386192214.00534.387202314.00634.388212414.00734.389262614.00834.390292814.00934.391302914.01034.3923414.01134.3932314.01234.39414.01334.395414.01434.396534.39734.39834.3991334.4001834.4012234.40234.40334.40434.40534.406134.407334.408534.409834.4101334.4111534.4121834.4132134.4142334.4152834.4163034.4173234.41834.41934.42034.42134.42234.42334.42434.42534.4261634.4271734.42834.42934.43034.43112345123456789101112131440.008140.008240.008340.020140.008440.020240.008540.020340.008640.020440.008740.020540.008840.020640.008940.020740.009040.020814.002414.002540.020914.002640.0210114.0027214.002840.02113440.02127233.1840.021314.015243.2914.01640.02141214.0171314.01840.02151414.0191540.021614.0201814.02140.02171914.0222014.02340.02182314.0242440.021914.0252514.02640.022014.02714.02840.0221440.022240.022340.022440.02251240.02265.1340.022745140.0228636640.022979840.023011914.0029131040.023114.0030151114.00311840.02321214.003220137.0114.003340.023322147.0214.00341540.02347.0314.0035167.0514.003640.0235177.0714.0037187.0814.003840.0236197.0914.00392040.02377.114.00407.1114.004140.02387.1214.00427.1340.02397.1440.02407.15237.1647.1720205623414.02914.03014.03114.03210
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
MONTANA
2022-01-012022-12-31
C001789
Property Tax, Property Tax, North Dakota, 2021
2021-12-31
C001789
ferc:OtherUseTaxMember
2021-12-31
C001789
Risk Partners Assurance, Ltd. - Capital Stockferc:CaptialStockMember
2022-12-31
C001789
TOTAL, , ,
2022-01-012022-12-31
C001789
Hydro Invasive Species Tax, Other Taxes, Montana, 2021
2022-12-31
C001789
Big Sky Midway B (BOZEMAN), Distribution, Unattended
2022-12-31
C001789
ferc:SulfurDioxideMemberferc:CurrentYearMember
2022-12-31
C001789
ferc:OtherPropertyTaxMember
2022-12-31
C001789
Seattle City Light , SF, Market-Based Rate
2022-01-012022-12-31
C001789
Butte Industrial Park (BUTTE), Distribution, Unattended
2022-12-31
C001789
Missoula City Sub #1 (MISSOULA), Distribution, Unattended
2022-12-31
C001789
Conrad Auto (GREAT FALLS), Transmission, Unattended
2022-01-012022-12-31
C001789
Basin Electric Power Cooperative BPAT WAPA NF MONTANA OATT BPAT.NWMT CROSSOVER
2022-01-012022-12-31
C001789
Billings Capacity Planningferc:ElectricUtilityMember
2022-01-012022-12-31
C001789
Powerex Corporation AVA WAPA NF MONTANA OATT AVAT.NWMT CROSSOVER
2022-01-012022-12-31
C001789
Montana Public Service Commission, Other Taxes, Montana, 2022
2021-12-31
C001789
ferc:NextTwelveMonthsMemberferc:SulfurDioxideMember
2022-12-31
C001789
Shorey Road Switchyard (BILLINGS), Transmission, Unattended
2022-12-31
C001789
Excess Deferred Income Taxes (Montana)
2022-01-012022-12-31
C001789
GRANT COUNTY PUD, LF, Reserve Energy
2022-01-012022-12-31
C001789
First Mortgage Bonds 4.03% (Montana)
2022-01-012022-12-31
C001789
Brian Bird, President, Chief Operating Officer
2022-01-012022-12-31
C001789
Energy Keepers, Inc. , SF, Market-Based Rate
2022-01-012022-12-31
C001789
Belgrade West (BOZEMAN), Distribution, Unattended
2022-12-31
C001789
Other Debit or Cr. Items (Describe, details in footnote):ferc:ElectricUtilityMemberferc:ElectricPlantInServiceMember
2022-01-012022-12-31
C001789
Great Falls Northwest (GREAT FALLS), Distribution, Unattended
2022-01-012022-12-31
C001789
Excess Deferred Income Taxes (Montana)
2022-12-31
C001789
Huron Gas Turbnie Plant B (SD), Transmission, Unattended
2022-01-012022-12-31
C001789
Energy Stored in Out of State Utilities (Montana)
2022-12-31
C001789
Tacoma Power (PURCHASED POWER SUPPLY), SF, Market-Based Rate Tariff
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
Billings Div Elec-Cap Blnkt Growth
2022-12-31
C001789
Montana Consumer Counsel Tax (Montana) - Docket 2018.10.67 - Order 7637
2022-12-31
C001789
CP Energy Marketing (US) Inc. WAPA PPW NF MONTANA OATT CROSSOVER JEFF
2022-01-012022-12-31
C001789
Pension Plan (Montana)
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. GWA AVA NF MONTANA OATT GLWND1 AVAT.NWMT
2022-01-012022-12-31
C001789
Butte Montana St B (BUTTE), Distribution, Unattended
2022-01-012022-12-31
C001789
Heavy Highway Tax, Other Taxes, Montana, 2022
2022-01-012022-12-31
C001789
Mitchell Park A (SD), Distribution, Unattended
2022-12-31
C001789
South Butte B (BUTTE), Transmission, Unattended
2022-01-012022-12-31
C001789
Taft Auto (MISSOULA), Transmission, Unattended
2022-01-012022-12-31
C001789
Generating Stations Under Project License
2022-12-31
C001789
Coyote, North Dakota (SD), Transmission, Unattended
2022-01-012022-12-31
C001789
Bridger Auto (BILLINGS), Transmission, Unattended
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
Minor Projects (Less than $1,000,000 - 183 items)
2022-01-012022-12-31
C001789
Big Sky Meadow Village (BOZEMAN), Distribution, Unattended
2022-12-31
C001789
ferc:OtherTaxesAndFeesMember
2021-12-31
C001789
Excess Deferred Income Taxes (South Dakota)
2021-12-31
C001789
ferc:OperatingUtilityMember
2022-12-31
C001789
Bellrock (BILLINGS), Distribution, Unattended
2022-01-012022-12-31
C001789
Redfield City (SD), Transmission, Unattended
2022-12-31
C001789
Property Tax Tracker (Montana) - Docket 2017.11.86 - Order 7580a; Annual Amortization
2022-12-31
C001789
Holter U1 Turbine Upgradeferc:ElectricUtilityMember
2022-12-31
C001789
EDF Trading North America, LLC NWMT NWMT NF MONTANA OATT COLSTRIP NWMT.SYSTEM
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
LAUREL AUTO TPIF
2022-01-012022-12-31
C001789
Deferred Gas Storage Sales (Montana) - Docket D2001.1.1; Amortization 2001 - 2039
2022-12-31
C001789
BC HYDRO DISTRIBUTION, LF, Reserve Energy
2022-01-012022-12-31
C001789
Amortization of Intangibles
2022-01-012022-12-31
C001789
State Unemployment Tax, Unemployment Tax, South Dakota, 2022
2021-12-31
C001789
EDF Trading North America, LLC PPW NWMT NF MONTANA OATT YTP GTFALLSNWMT
2022-01-012022-12-31
C001789
Two Dot
2022-01-012022-12-31
C001789
Various - 69 KV, , Various,
2022-01-012022-12-31
C001789
Optional Studies
2022-01-012022-12-31
C001789
Huron GT #2
2022-12-31
C001789
Yankton East B (SD), Transmission, Unattended
2022-12-31
C001789
Big Timber Wind (NON TIER II QF-1), LU,
2022-01-012022-12-31
C001789
Red Lodge Northside (BILLINGS), Distribution, Unattended
2022-01-012022-12-31
C001789
Compensated Absences (Montana) - Docket 97.11.219
2021-12-31
C001789
First Mortgage Bonds 2.80% (South Dakota)
2022-01-012022-12-31
C001789
Transalta Energy Marketing (US) Inc. NWMT WAUW NF MONTANA OATT MATL.NWMT CROSSOVER
2022-01-012022-12-31
C001789
South Huntley (BILLINGS), Transmission, Unattended
2022-01-012022-12-31
C001789
Transfers
2022-01-012022-12-31
C001789
Day Ahead & Real Time Admin
2022-01-012022-03-31
C001789
ferc:GasUtilityMember
2022-12-31
C001789
Energy Keepers Inc. NWMT PACE NF MONTANA OATT KERR BRDY
2022-01-012022-12-31
C001789
Billings Rimrock A (BILLINGS), Transmission, Unattended
2022-12-31
C001789
MISSOULA DIVISION, ,
2022-01-012022-12-31
C001789
Debt Financing Costs
2022-01-012022-12-31
C001789
MT General Service - 1
2022-01-012022-12-31
C001789
NorthWestern Services, LLC - Equity in Undistributed Earningsferc:UnappriatedUndistributedSubsidiaryEarningsMember
2021-12-31
C001789
Huron West Park C (SD), Transmission, Unattended
2022-01-012022-12-31
C001789
East Helena Switchyard C (HELENA), Transmission, Unattended
2022-12-31
C001789
Bradley Creek (BOZEMAN), Transmission, Unattended
2022-12-31
C001789
Other Minor Items (9) - some are amortized over various periods (Montana)
2022-01-012022-12-31
C001789
EDF Trading North America, LLC PPW NWMT NF MONTANA OATT YTP NWMT.SYSTEM
2022-01-012022-12-31
C001789
ASIMI (BUTTE), Transmission, Unattended
2022-01-012022-12-31
C001789
Oil
DGGS
2022-01-012022-12-31
C001789
Huron Gas Turbine Plant A (SD), Transmission, Unattended
2022-01-012022-12-31
C001789
Excess Deferred Income Taxes (Montana)
2022-12-31
C001789
Clatskanie Peoples Utility District - Electric (PURCHASED POWER SUPPLY), SF, Market-Based Rate Tariff
2022-01-012022-12-31
C001789
Treasury Stock Activity
2021-01-012021-12-31
C001789
Macquarie Energy, LLC WAPA BPAT SFP MONTANA OATT CROSSOVER BPAT.NWMT
2022-01-012022-12-31
C001789
Montana Consumer Counsel Tax (Montana) - Docket 2018.10.67 - Order 7637
2022-01-012022-12-31
C001789
WET Tax, Other Taxes, Montana, 2021
2022-12-31
C001789
Neal
2022-01-012022-12-31
C001789
Regulatory Asset/Liabilityferc:GasUtilityMember
2022-01-012022-12-31
C001789
Canadian Montana Pipeline Corporation - Equity in Undistributed Earningsferc:UnappriatedUndistributedSubsidiaryEarningsMember
2022-12-31
C001789
Risk Partners Assurance, Ltd. - Capital Stockferc:CaptialStockMember
2022-01-012022-12-31
C001789
Basin Electric Power Cooperative NWMT PACE NF MONTANA OATT JUDITHGAP YTP
2022-01-012022-12-31
C001789
PacifiCorp PPW AVA SFP MONTANA OATT YTP AVAT.NWMT
2022-01-012022-12-31
C001789
Huron Gas Turbine Plant C (SD), Transmission, Unattended
2022-12-31
C001789
Guzman Energy, LLC BPAT AVA NF MONTANA OATT BPAT.NWMT AVAT.NWMT
2022-01-012022-12-31
C001789
Mobile C
2022-01-012022-12-31
C001789
First Mortgage Bonds 3.21% (South Dakota)
2022-12-31
C001789
ferc:GasUtilityMember
Pension/Postretirement Benefits
2022-01-012022-12-31
C001789
Havre Eastside (HAVRE), Distribution, Unattended
2022-01-012022-12-31
C001789
Crystal Lail, Vice President, Chief Financial Officer
2022-01-012022-12-31
C001789
Puget Sound Energy Marketing AVA AVA SFP MONTANA OATT COLSTRIP AVAT.NWMT
2022-01-012022-12-31
C001789
First Mortgage Bonds 4.30% (Montana)
2022-01-012022-12-31
C001789
ferc:LocalTaxMemberferc:ElectricUtilityMember
2022-01-012022-12-31
C001789
ferc:SeveranceTaxMember
2022-01-012022-12-31
C001789
Montana Public Service Commission Consumer Counsel Taxes (Montana) - Dockets 2017.9.78 and 2018.10.67
2021-12-31
C001789
Transalta Energy Marketing (US) Inc. 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. NWMT PACE SFP MONTANA OATT MATL.NWMT BRDY
2022-01-012022-12-31
C001789
ferc:PaidInCapitalMember
NorthWestern Services, LLC - Paid in Capital
2022-01-012022-12-31
C001789
Golden Sunlight (BUTTE), Distribution, Unattended
2022-12-31
C001789
ferc:ElectricUtilityMemberferc:CommonPlantElectricMember
2022-01-012022-12-31
C001789
Montana Operations
2022-01-012022-12-31
C001789
Mill Creek B (BUTTE), Transmission, Unattended
2022-12-31
C001789
Macquarie Energy, LLC PPW BPAT SFP MONTANA OATT YTP BPAT.NWMT
2022-01-012022-12-31
C001789
First Mortgage Bonds 4.22% (South Dakota)
2022-12-31
C001789
Flow-through Income Taxes (South Dakota)
2021-12-31
C001789
Montana Public Service Commission, Other Taxes, Montana, 2021
2021-12-31
C001789
Transalta Energy Marketing (US) Inc. 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. AVA PPW SFP MONTANA OATT AVAT.NWMT YTP
2022-01-012022-12-31
C001789
Stanford Auto B (BILLINGS), Transmission, Unattended
2022-01-012022-12-31
C001789
SD 95 Reddy Guard
2022-01-012022-12-31
C001789
Crooked Falls A (GREAT FALLS), Transmission, Unattended
2022-01-012022-12-31
C001789
Other Accounts (Specify, provide details in footnote):
2022-01-012022-12-31
C001789
Other Minor Items (9) - some are amortized over various periods (Montana)
2021-12-31
C001789
ferc:FranchiseTaxMember
2022-12-31
C001789
Gross Receipts Tax, Other Taxes, South Dakota, 2022
2022-12-31
C001789
ferc:OtherProductionPlantMemberferc:ElectricUtilityMember
2022-01-012022-12-31
C001789
SOUTH DAKOTA
2022-01-012022-12-31
C001789
Vitol Inc. AVA PPW NF MONTANA OATT AVAT.NWMT BRDY
2022-01-012022-12-31
C001789
Avangrid Renewables, LLC (PURCHASED POWER SUPPLY), SF, Market-Based Rate Tariff
2022-01-012022-12-31
C001789
Western Area Power Administration WAPA WAPA NF MONTANA OATT CROSSOVER GREATFALLS
2022-01-012022-12-31
C001789
Avista Corporation NWMT AVA NF MONTANA OATT NWMTIMBALANC AVAT.NWMT
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. GWA PPW SFP MONTANA OATT GLWND2 BRDY
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
2ND LAUREL CITY 100
2022-01-012022-12-31
C001789
Billings Eighth Street (BILLINGS), Transmission, Unattended
2022-12-31
C001789
Board of Directors
2022-01-012022-12-31
C001789
Meridian (BILLINGS), Distribution, Unattended
2022-12-31
C001789
Investment in Equity Securities
2022-01-012022-12-31
C001789
DOUGLAS COUNTY PUD (RESERVE SHARING), LF, Reserve Energy Services
2022-01-012022-12-31
C001789
Guzman Energy, LLC WAPA AVA NF MONTANA OATT CROSSOVER AVAT.NWMT
2022-01-012022-12-31
C001789
Macquarie Energy, LLC NWMT BPA NF MONTANA OATT BGI BPAT.NWMT
2022-01-012022-12-31
C001789
Redfield City (SD), Transmission, Unattended
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
AMI Metering & Infrastructure
2022-12-31
C001789
Canadian-Montana Pipe Line Corporation
2022-12-31
C001789
Morgan Stanley Capital Group, Inc. GWA WAPA NF MONTANA OATT GLWND1 CROSSOVER
2022-01-012022-12-31
C001789
Big Horn County Electric Coop. Inc. WAPA Big Horn County Electric Coop. Inc. FNO Montana OATT Various & Great Falls Various in Montana
2022-01-012022-12-31
C001789
Aberdeen Ethanol (SD), Distribution, Unattended
2022-12-31
C001789
Anaconda, Billings, Wood H Frame, 556.5 MCM ACSR
2022-01-012022-12-31
C001789
ferc:UnemploymentTaxMember
2022-12-31
C001789
ferc:ExciseTaxMember
2021-12-31
C001789
Dakota Access A (SD), Transmission, Unattended
2022-01-012022-12-31
C001789
SD 11 Resid Space Htg 1 Meter
2022-01-012022-12-31
C001789
Bozeman East Gallatin Auto (BOZEMAN), Distribution, Unattended
2022-12-31
C001789
Portland General Electric Company NWMT PPW NF MONTANA OATT COLSTRIP JEFF
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
EELT Tax, Other Taxes, Montana, 2022
2022-01-012022-12-31
C001789
Rainbow Energy Marketing Corporation (PURCHASED POWER SUPPLY), SF, Market-Based Rate Tariff
2022-01-012022-12-31
C001789
Whatley (HAVRE), Transmission, Unattended
2022-12-31
C001789
Montana Public Service Commission, Other Taxes, Montana, 2022
2022-01-012022-12-31
C001789
SD 70 Controlled Off-Peak
2022-01-012022-12-31
C001789
Property Tax, Property Tax, North Dakota, 2022
2022-01-012022-12-31
C001789
First Mortgage Bonds 5.01% (South Dakota)
2022-12-31
C001789
Heather Grahame, Vice President, General Counsel and Regulatory and Federal Affairs
2022-01-012022-12-31
C001789
Oil
Yankton
2022-01-012022-12-31
C001789
ferc:OtherUtilityMember
2021-12-31
C001789
Rainbow Electric Marketing Corp. PPW PPW NF MONTANA OATT YTP JEFF
2022-01-012022-12-31
C001789
Rainbow Electric Marketing Corp. PPW WAPA NF MONTANA OATT YTP CROSSOVER
2022-01-012022-12-31
C001789
Benefis Health Systems Energy Keepers inc. Benefis Health Systems FNO Montana OATT Kerr Various in Montana
2022-01-012022-12-31
C001789
Property Tax, Property Tax, Montana, 2022
2021-12-31
C001789
MAG Energy Solutions NWMT AVA SFP MONTANA OATT MATL.NWMT AVAT.NWMT
2022-01-012022-12-31
C001789
Transalta Energy Marketing (US) Inc. NWMT BPAT NF MONTANA OATT MATL.NWMT BPAT.NWMT
2022-01-012022-12-31
C001789
South Peak Wind (NON TIER II QF-1), LU,
2022-01-012022-12-31
C001789
Supply:
2022-01-012022-12-31
C001789
ferc:OtherTaxesAndFeesMember
2022-01-012022-12-31
C001789
Livingston Westside A (BOZEMAN), Transmission, Unattended
2022-01-012022-12-31
C001789
ferc:ExciseTaxMember
2022-01-012022-12-31
C001789
Montana Operationsferc:MayMember
2022-01-012022-12-31
C001789
General Mills Operations, LLC Energy Keepers Inc. General Mills Operations, LLC FNO Montana OATT Kerr Great Falls, MT
2022-01-012022-12-31
C001789
Basin Electric Power Cooperative NWMT PACE NF MONTANA OATT HOLTER YTP
2022-01-012022-12-31
C001789
Highwood Switchyard (GREAT FALLS), Transmission, Unattended
2022-12-31
C001789
WET Tax, Other Taxes, Montana, 2022
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMemberferc:OtherAdValoremTaxMember
2022-01-012022-12-31
C001789
Yankton East A (SD), Transmission, Unattended
2022-12-31
C001789
Billings Steam Plant Switchyard B (BILLINGS), Transmission, Unattended
2022-01-012022-12-31
C001789
Transfersferc:ElectricUtilityMember
2022-01-012022-12-31
C001789
Black Hills Power Inc. WAPA PPW NF MONTANA OATT CROSSOVER YTP
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
Bozeman Div Elec-Cap Blnkt Growth
2022-01-012022-12-31
C001789
Clark Jct. (SD), Transmission, Unattended
2022-01-012022-12-31
C001789
Deferred Book Revenue & Gains
2022-01-012022-12-31
C001789
First Mortgage Bonds 4.85% (South Dakota)
2022-01-012022-12-31
C001789
Neal, IA, Hinton, IA, H-Wood, 954 MCM
2022-01-012022-12-31
C001789
Transalta Energy Marketing (US) Inc. BPAT PPW NF MONTANA OATT BPAT.NWMT YTP
2022-01-012022-12-31
C001789
Portland General Electric (PURCHASED POWER SUPPLY), SF, Market-Based Rate Tariff
2022-01-012022-12-31
C001789
Amortization of
2022-01-012022-12-31
C001789
Macquarie Energy, LLC NWMT AVA NF MONTANA OATT JUDITHGAP AVAT.NWMT
2022-01-012022-12-31
C001789
Townsend Transmission Sub siteferc:LandAndRightsMember
2022-12-31
C001789
Aberdeen B (SD), Transmission, Unattended
2022-12-31
C001789
Risk Partners Assurance, Ltd. - Equity in Undistributed Earningsferc:UnappriatedUndistributedSubsidiaryEarningsMember
2022-01-012022-12-31
C001789
Vigilante Elec. Coop OLF
2022-01-012022-12-31
C001789
Pacificorp - Costrip Loss/Startup (EXCHANGES), EX, RS 190
2022-01-012022-12-31
C001789
Montana Public Service Commission Consumer Counsel Taxes (Montana) - Dockets 2017.9.78 and 2018.10.67
2022-12-31
C001789
Pension Requirement (South Dakota)
2021-12-31
C001789
State of Montana-DNRC / Broadwater Dam (TIER II QF), LU,
2022-01-012022-12-31
C001789
Generating Stations Under Project License
2022-01-012022-12-31
C001789
ferc:FebruaryMember
South Dakota Operations
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. NWMT BPAT NF MONTANA OATT NWMTIMBALANC BPAT.NWMT
2022-01-012022-12-31
C001789
Pollution Control Revenue Bonds - 2.00% Series, City of Forsyth (Montana)
2022-01-012022-12-31
C001789
Butte Concentrator (BUTTE), Distribution, Unattended
2022-01-012022-12-31
C001789
Billings Eastside (BILLINGS), Distribution, Unattended
2022-12-31
C001789
Canadian Montana Pipeline Corporation - Paid in Capitalferc:PaidInCapitalMember
2021-12-31
C001789
Transalta Energy Marketing (US) Inc. BPAT WAPA NF MONTANA OATT BPAT.NWMT CROSSOVER
2022-01-012022-12-31
C001789
FAS 106 (Montana) - Docket 93.6.24 and Docket 2009.9.129
2022-01-012022-12-31
C001789
Holter U1 Generator Rewindferc:ElectricUtilityMember
2022-12-31
C001789
Energy Keepers Inc. AVA AVA SFP MONTANA OATT COLSTRIP AVAT.NWMT
2022-01-012022-12-31
C001789
Federal Income Tax, Income Tax, Montana, 2022ferc:ElectricUtilityMember
2022-01-012022-12-31
C001789
Ennis City (BOZEMAN), Distribution, Unattended
2022-12-31
C001789
AVISTA Corporation, LF, Reserve Energy
2022-01-012022-12-31
C001789
Aberdeen Manufactured Gas Plant (South Dakota) - Docket NG 11-003
2022-01-012022-12-31
C001789
Macquarie Energy, LLC PPW AVA SFP MONTANA OATT YTP AVAT.NWMT
2022-01-012022-12-31
C001789
ScheduleUnrecoveredPlantAndRegulatoryStudyCostsAbstract
2022-01-012022-12-31
C001789
SD 10 Residential
2022-01-012022-12-31
C001789
ferc:OtherAllocatedTaxMember
2022-12-31
C001789
SW Freeman (SD), Distribution, Unattended
2022-12-31
C001789
Mobile B
2022-12-31
C001789
ferc:OtherElectricUtilityMember
2021-12-31
C001789
First Mortgage Bonds 3.11% (Montana)
2022-01-012022-12-31
C001789
2188, Hauser
2022-12-31
C001789
Ovando Switchyard (MISSOULA), Transmission, Unattended
2022-12-31
C001789
Tenaska Power Services Co. NWMT BPAT NF MONTANA OATT COLSTRIP BPAT.NWMT
2022-01-012022-12-31
C001789
Barrett's Minerals (BUTTE), Distribution, Unattended
2022-01-012022-12-31
C001789
Brookfield Renewable Trading and Marketing LP BPAT PPW NF MONTANA OATT BPAT.NWMT YTP
2022-01-012022-12-31
C001789
LAUREL AUTO NETWORK
2022-01-012022-12-31
C001789
Stanford Auto B (BILLINGS), Transmission, Unattended
2022-12-31
C001789
Sheridan Auto (BUTTE), Transmission, Unattended
2022-12-31
C001789
Sheridan Auto (BUTTE), Transmission, Unattended
2022-01-012022-12-31
C001789
Aberdeen Manufactured Gas Plant (South Dakota) - Docket NG 11-003
2021-12-31
C001789
First Mortgage Bonds 3.98% (Montana) B
2022-01-012022-12-31
C001789
Crow Creek Junction (MISSOULA), Transmission, Unattended
2022-12-31
C001789
Havre Pipeline Company - Paid in Capitalferc:PaidInCapitalMember
2022-12-31
C001789
Macquarie Energy, LLC AVA PPW SFP MONTANA OATT AVAT.NWMT MLCK
2022-01-012022-12-31
C001789
All 69 kV, , Various,
2022-01-012022-12-31
C001789
Current Ad Valorem True-Up (South Dakota) - Docket GE98-001
2022-01-012022-12-31
C001789
Bozeman East Gallatin Auto (BOZEMAN), Transmission, Unattended
2022-01-012022-12-31
C001789
Basin Power Plant (PURCHASED POWER SUPPLY), SF, Market-Based Rate Tariff
2022-01-012022-12-31
C001789
ferc:MiscellaneousOtherTaxMember
2021-12-31
C001789
Avista Corporation AVA AVA NF MONTANA OATT COLSTRIP AVAT.NWMT
2022-01-012022-12-31
C001789
Glasgow Westside (HAVRE), Distribution, Unattended
2022-01-012022-12-31
C001789
Property Tax, Property Tax, Nebraska, 2021
2021-12-31
C001789
SD 21 General Service
2022-01-012022-12-31
C001789
Hanover Hydro (NON TIER II QF-1), LU,
2022-01-012022-12-31
C001789
Dynasty Power Inc. BPAT PPW NF MONTANA OATT BPAT.NWMT BRDY
2022-01-012022-12-31
C001789
Energy Keepers Inc. NWMT AVA SFP MONTANA OATT KERR AVAT.NWMT
2022-01-012022-12-31
C001789
Transalta Energy Marketing (US) Inc. BPAT PPW NF MONTANA OATT BPAT.NWMT JEFF
2022-01-012022-12-31
C001789
2022-01-012022-12-31
C001789
Flow-through Income Taxes (Montana)
2021-12-31
C001789
Colstrip 500 (BILLINGS), Transmission, Unattended
2022-12-31
C001789
ferc:ElectricUtilityMember
2021-01-012021-12-31
C001789
Use Tax, Sales And Use Tax, South Dakota, 2022
2022-01-012022-12-31
C001789
Portland General Electric Company NWMT AVA NF MONTANA OATT MATL.NWMT AVAT.NWMT
2022-01-012022-12-31
C001789
Shell Energy North America PPW BPAT SFP MONTANA OATT YTP BPAT.NWMT
2022-01-012022-12-31
C001789
NorthWestern Services, LLC - Capital Stockferc:CaptialStockMember
2022-01-012022-12-31
C001789
Energy Keepers Inc. PPW BPAT NF MONTANA OATT YTP BPAT.NWMT
2022-01-012022-12-31
C001789
Transalta Energy Marketing (US) Inc. WAPA PPW NF MONTANA OATT CROSSOVER YTP
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. GWA PPW NF MONTANA OATT GLWND1 BRDY
2022-01-012022-12-31
C001789
Puget Sound Energy Marketing PPW PPW NF MONTANA OATT MLCK BRDY
2022-01-012022-12-31
C001789
Two Dot
2022-12-31
C001789
ferc:ElectricUtilityMember
Regulatory Assets
2021-12-31
C001789
Billings Steam Plant Switchyard A (BILLINGS), Distribution, Unattended
2022-12-31
C001789
Common Stock (NASDQ)
2022-12-31
C001789
Helena Golf Course Bank #2 (HELENA), Distribution, Unattended
2022-01-012022-12-31
C001789
Family Protector Plan Future Payments (South Dakota)
2022-12-31
C001789
Colstrip, Broadview A, St. Tower, 795 KCM ACSR
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. NWMT PACE NF MONTANA OATT MATL.NWMT BRDY
2022-01-012022-12-31
C001789
Billings Eastside (BILLINGS), Distribution, Unattended
2022-01-012022-12-31
C001789
Helena Westside B (HELENA), Distribution, Unattended
2022-12-31
C001789
Talen Energy Marketing, LLC - Startup (EXCHANGES), EX, RS 190
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. NWMT GWA NF MONTANA OATT HARDIN GLWND2
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
Unbilled Revenue
2022-01-012022-12-31
C001789
Yankton East Plant B (SD), Transmission, Unattended
2022-01-012022-12-31
C001789
Big Stone Plant B (SD), Transmission, Unattended
2022-12-31
C001789
Bonneville Power Administration BPA Bonneville Power Administration FNO Montana OATT BPAT.NWMT Various in Montana
2022-01-012022-12-31
C001789
Clark
2022-01-012022-12-31
C001789
Macquarie Energy, LLC NWMT WAUW NF MONTANA OATT TFALLS CROSSOVER
2022-01-012022-12-31
C001789
Mill Creek Generating (BUTTE), Transmission, Unattended
2022-01-012022-12-31
C001789
Havre Pipeline Company - Paid in Capitalferc:PaidInCapitalMember
2022-01-012022-12-31
C001789
MHD (BUTTE), Distribution, Unattended
2022-01-012022-12-31
C001789
Havre Pipeline Company - Paid in Capitalferc:PaidInCapitalMember
2021-12-31
C001789
Excess Deferred Income Taxes (South Dakota)
2022-01-012022-12-31
C001789
Pacificorp , SF, Market-Based Rate
2022-01-012022-12-31
C001789
Energy Keepers Inc. AVA BPAT NF MONTANA OATT AVAT.NWMT BPAT.NWMT
2022-01-012022-12-31
C001789
Spion Kop
2022-01-012022-12-31
C001789
Coyote, ND, Center, ND, H-Wood, 954 MCM
2022-01-012022-12-31
C001789
Tenaska Power (PURCHASED POWER SUPPLY), SF, Market-Based Rate Tariff
2022-01-012022-12-31
C001789
Columbus-Rajelje Auto (BILLINGS), Transmission, Unattended
2022-12-31
C001789
Federal Unemplyment Tax, Unemployment Tax, South Dakota, 2022
2022-01-012022-12-31
C001789
Bozeman East Gallatin Auto (BOZEMAN), Distribution, Unattended
2022-01-012022-12-31
C001789
Macquarie Energy, LLC WAPA PPW NF MONTANA OATT CROSSOVER BRDY
2022-01-012022-12-31
C001789
Asset Retirement Obligation (South Dakota)
2022-01-012022-12-31
C001789
Ennis Auto (BOZEMAN), Transmission, Unattended
2022-12-31
C001789
ferc:ElectricUtilityMemberferc:SteamProductionPlantMember
2022-01-012022-12-31
C001789
Rainbow Electric Marketing Corp. AVA PPW SFP MONTANA OATT AVAT.NWMT YTP
2022-01-012022-12-31
C001789
Transmission Line Rights (Montana)
2022-01-012022-12-31
C001789
Shell Energy North America WAPA BPAT NF MONTANA OATT CROSSOVER BPAT.NWMT
2022-01-012022-12-31
C001789
Laurel Auto
2022-01-012022-12-31
C001789
Billings Rimrock B (BILLINGS), Distribution, Unattended
2022-12-31
C001789
Federal Income Tax, Income Tax, Montana, 2022
2022-01-012022-12-31
C001789
TACOMA POWER (RESERVE SHARING), LF, Reserve Energy Services
2022-01-012022-12-31
C001789
John Hines, Vice, President, Supply and Montana Government Affairs
2022-01-012022-12-31
C001789
TIER II QF CONTRACTS:, ,
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
Regulatory Asset/Liability
2022-01-012022-12-31
C001789
Mobile B
2022-01-012022-12-31
C001789
Property Tax, Property Tax, Nebraska, 2022
2022-12-31
C001789
Other Noncash Charges to Income, Net
2022-01-012022-12-31
C001789
Platte A (SD), Distribution, Unattended
2022-01-012022-12-31
C001789
ScheduleEnergyStorageOperationsLargePlantsAbstract
2022-01-012022-12-31
C001789
Account 255 balanceferc:OtherUtilityOrNonutilityMember
2022-12-31
C001789
ferc:GasUtilityMember
Unbilled Revenue
2022-01-012022-12-31
C001789
Missoula Miller Creek A (MISSOULA), Transmission, Unattended
2022-01-012022-12-31
C001789
Montana State University - Bozeman WAPA Montana State University - Bozeman FNO Montana OATT Fort Peck West Great Falls, MT
2022-01-012022-12-31
C001789
50 Others Under 10,000 KVA (SD), Distribution, Unattended
2022-12-31
C001789
Shell Energy North America (US), L.P. , SF, Market-Based Rate
2022-01-012022-12-31
C001789
ferc:FuelTaxMember
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
10%
2021-12-31
C001789
CP Energy Marketing (US) Inc. NWMT PACE NF MONTANA OATT MATL.NWMT YTP
2022-01-012022-12-31
C001789
Calumet Refining, LLC Talen Energy Calumet Montana Refining Company, Inc. FNO Montana OATT Colstrip Great Falls, MT
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. AVA NWMT NF MONTANA OATT AVAT.NWMT MATL.NWMT
2022-01-012022-12-31
C001789
Rounding
2022-01-012022-12-31
C001789
Curtis Pohl, Vice President, Distribution
2022-01-012022-12-31
C001789
Avista Corporation NWMT AVA NF MONTANA OATT COLSTRIP AVAT.NWMT
2022-01-012022-12-31
C001789
Thompson Falls City (MISSOULA), Distribution, Unattended
2022-01-012022-12-31
C001789
Rainbow, Havre, Wood H Frame, 636 MCM ACSR
2022-01-012022-12-31
C001789
BPA Residential Exchange Program (Montana) - Docket 2018.8.49 Order 7630; Annual Amortization
2022-01-012022-12-31
C001789
ferc:LocalTaxMember
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. GWA BPAT SFP MONTANA OATT GLWND2 BPAT.NWMT
2022-01-012022-12-31
C001789
MAG Energy Solutions WAPA PPW NF MONTANA OATT CROSSOVER BRDY
2022-01-012022-12-31
C001789
ferc:ElectricUtilityMember
Laurel Auto
2022-12-31
C001789
Basin Electric Power Cooperative PPW NWMT NF MONTANA OATT BRDY NWMT.SYSTEM
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. BPAT PPW NF MONTANA OATT BPAT.NWMT BRDY
2022-01-012022-12-31
C001789
State Income Tax, State Tax, Montana, 2022
2022-12-31
C001789
Wisconsin Creek (NON TIER II QF-1), LU,
2022-01-012022-12-31
C001789
WMU West Sub (SD), Transmission, Unattended
2022-01-012022-12-31
C001789
Property Tax, Property Tax, Iowa, 2021
2022-01-012022-12-31
C001789
Property Tax, Property Tax, Nebraska, 2021
2022-01-012022-12-31
C001789
Hardin Auto A (BILLINGS), Transmission, Unattended
2022-12-31
C001789
Butte Concentrator (BUTTE), Distribution, Unattended
2022-12-31
C001789
Dynasty Power Inc. PPW WAPA NF MONTANA OATT BRDY CROSSOVER
2022-01-012022-12-31
C001789
The Energy Authority WAPA PPW NF MONTANA OATT CROSSOVER JEFF
2022-01-012022-12-31
C001789
Mill Creek A (BUTTE), Transmission, Unattended
2022-12-31
C001789
Macquarie Energy, LLC NWMT AVA NF MONTANA OATT TFALLS AVAT.NWMT
2022-01-012022-12-31
C001789
Minor Projects (Less than $250,000 - 18 items)
2022-01-012022-12-31
C001789
State Unemployment Tax, Unemployment Tax, Montana, 2022
2022-01-012022-12-31
C001789
ferc:OtherAllocatedTaxMember
2022-01-012022-12-31
C001789
East Helena Switchyard A (HELENA), Distribution, Unattended
2022-01-012022-12-31
C001789
Federal Income Tax, Income Tax, South Dakota/Nebraska, 2022
2022-01-012022-12-31
C001789
State Income Tax, State Tax, South Dakota/Nebraska, 2022
2022-12-31
C001789
Morgan Stanley Capital Group, Inc. PACE NWMT SFP MONTANA OATT YTP MATL.NWMT
2022-01-012022-12-31
C001789
Property Tax - Blackfoot, Property Tax, Montana, 2022
2022-01-012022-12-31
C001789
Clyde Park (BOZEMAN), Transmission, Unattended
2022-12-31
C001789
Harlowtown B (BILLINGS), Transmission, Unattended
2022-01-012022-12-31
C001789
Helena Eastside (HELENA), Distribution, Unattended
2022-01-012022-12-31
C001789
Big Timber Auto (BOZEMAN), Transmission, Unattended
2022-12-31
C001789
Federal Unemplyment Tax, Unemployment Tax, South Dakota, 2021
2022-12-31
C001789
Deferred Fuel for Electric Generation (South Dakota)
2022-12-31
C001789
1869, Thompson Falls
2022-01-012022-12-31
C001789
0, Common Hydro Plant
2022-01-012022-12-31
C001789
Rounding, ,
2022-01-012022-12-31
C001789
EDF Trading North America, LLC NWMT NWMT NF MONTANA OATT JUDITHGAP COLSTRIP
2022-01-012022-12-31
C001789
Morgan Stanley Capital Group, Inc. GWA PPW NF MONTANA OATT GLWND2 BRDY
2022-01-012022-12-31
C001789
Dynasty Power Inc. BPAT PPW NF MONTANA OATT BPAT.NWMT YTP
2022-01-012022-12-31
C001789
Laurel City (BILLINGS), Distribution, Unattended
2022-01-012022-12-31
C001789
Property Tax - Crow Tribe, Property Tax, Montana, 2020
2022-01-012022-12-31
C001789
ferc:OtherTaxMember
2021-12-31
C001789
Lake Helena (HELENA), Transmission, Unattended
2022-01-012022-12-31
C001789
ferc:OtherInvestmentsInSubsidiaryCompaniesMember
Canadian Montana Pipeline Corporation - Translation Adjustment
2022-01-012022-12-31
C001789
ferc:IncomeTaxMember
2021-12-31
C001789
Morgan Stanley Capital Group, Inc. 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