NorthWestern Corporation
Balancing Authority Summary Information
NorthWestern Corporation is ranked #32 out of 65 balancing authorities in terms of total annual electricity generation.
| Balancing Authority | NorthWestern Corporation |
|---|---|
| States | Montana Wyoming |
| Last Update | Mar 2026 |
| Annual Generation | 17.8 TWh |
| Power Plants | 69 |
| Utilities | 44 |
| Ranked #32 out of 65 in terms of net annual generation | |
| Ranked #15 out of 32 in terms of annual generation from coal | |
| Power Plant Types | Coal | 47.9% Wind | 24.7% Water | 19.5% Natural Gas | 5% Solar | 1.8% |
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Daily Net Generation for NorthWestern Corporation for the past 3 Years
| Plant Name | Utility | Location | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|
| Colstrip | Talen Montana LLC | Colstrip, MT | 9 TWh | Oct 1975 | Dec 2025 | Subbituminous Coal : 99.9% |
| Selis Ksanka Qlispe | Energy Keepers Inc | Polson, MT | 970 GWh | Sep 1938 | Dec 2024 | Water |
| Clearwater Wind East | Clearwater Wind East, LLC | Miles City, MT | 830 GWh | Dec 2023 | Dec 2025 | Wind |
| Dave Gates Generating Station | NorthWestern Energy (MT wind/thermal) | Anaconda, MT | 503 GWh | Dec 2010 | Dec 2025 | Natural Gas |
| Hardin Generator Project | Heorot Power Management | Hardin, MT | 481 GWh | Feb 2006 | Dec 2024 | Subbituminous Coal : 97.5% Bituminous Coal : 1.6% Natural Gas : 0.9% |
| Yellowstone Energy LP | Yellowstone Energy LP | Billings, MT | 458 GWh | May 1995 | Dec 2025 | Petroleum Coke : 99.2% Other Gas : 0.6% |
| Thompson Falls | NorthWestern Energy (MT Hydro) | Thompson Falls, MT | 436 GWh | Jun 1915 | Dec 2024 | Water |
| Ryan | NorthWestern Energy (MT Hydro) | Great Falls, MT | 435 GWh | Jul 1915 | Dec 2024 | Water |
| Judith Gap Wind Energy Center | Invenergy Services LLC | Harlowton, MT | 412 GWh | Nov 2005 | Dec 2025 | Wind |
| Clearwater Wind II | Clearwater Wind II, LLC | Miles City, MT | 401 GWh | Nov 2023 | Dec 2025 | Wind |
| Yellowstone County Generating Station | NorthWestern Energy (MT wind/thermal) | Laurel, MT | 383 GWh | Jun 2024 | Dec 2025 | Natural Gas |
| Rainbow (MT) | NorthWestern Energy (MT Hydro) | Great Falls, MT | 329 GWh | Feb 2013 | Dec 2024 | Water |
| Colstrip Energy LP | Colstrip Energy LP | Colstrip, MT | 288 GWh | Jan 1990 | Dec 2024 | Waste/Other Coal : 99.8% |
| Holter | NorthWestern Energy (MT Hydro) | Wolf Creek, MT | 266 GWh | Jun 1918 | Dec 2024 | Water |
| Morony | NorthWestern Energy (MT Hydro) | Great Falls, MT | 255 GWh | Dec 1929 | Dec 2024 | Water |
| Stillwater Wind, LLC | Pattern Operators LP | Reed Point, MT | 253 GWh | Sep 2018 | Dec 2025 | Wind |
| South Peak Wind | ALLETE Clean Energy | Geyser, MT | 244 GWh | Mar 2020 | Dec 2025 | Wind |
| Cochrane | NorthWestern Energy (MT Hydro) | Great Falls, MT | 228 GWh | Jun 1958 | Dec 2024 | Water |
| Basin Creek Plant | Basin Creek Power Services LLC | Butte, MT | 169 GWh | May 2006 | Dec 2025 | Natural Gas |
| Apex Solar | Apex Solar LLC | Dillon, MT | 165 GWh | Jul 2023 | Dec 2025 | Solar |
| Beaver Creek Wind Facility | Puget Sound Energy Inc | Big Timber, MT | 161 GWh | - | Dec 2025 | Wind |
| MTSUN | Greenbacker Renewable Energy Corporation | Billings, MT | 149 GWh | Dec 2022 | Dec 2025 | Solar |
| Hauser | NorthWestern Energy (MT Hydro) | Helena, MT | 134 GWh | Oct 1911 | Dec 2024 | Water |
| Black Eagle | NorthWestern Energy (MT Hydro) | Great Falls, MT | 127 GWh | Aug 1927 | Dec 2024 | Water |
| Spion Kop Wind Farm | NorthWestern Energy (MT wind/thermal) | Geyser, MT | 111 GWh | Nov 2012 | Dec 2024 | Wind |
| Greenfield Wind - MT | Greenbacker Renewable Energy Corporation | Fairfield, MT | 82 GWh | Sep 2016 | Dec 2024 | Wind |
| Madison Dam | NorthWestern Energy (MT Hydro) | Ennis, MT | 76 GWh | Aug 1906 | Dec 2024 | Water |
| Gordon Butte Wind LLC | Gordon Butte Wind LLC | Martinsdale, MT | 73 GWh | Dec 2011 | Dec 2024 | Wind |
| Big Timber Wind Farm | Consolidated Edison Development Inc. | Big Timber, MT | 66 GWh | Jan 2018 | Dec 2025 | Wind |
| Mystic | NorthWestern Energy (MT Hydro) | Fishtail, MT | 54 GWh | Apr 1925 | Dec 2024 | Water |
| Broadwater Power Project | Montana Dept-Natural Res&Consv | Toston, MT | 47 GWh | May 1989 | Dec 2024 | Water |
| Two Dot Wind Farm | NorthWestern Energy (MT wind/thermal) | Two Dot, MT | 35 GWh | May 2014 | Dec 2024 | Wind |
| Musselshell Wind Project Two LLC | Musselshell Wind Project Two LLC | Shawmut, MT | 27 GWh | Nov 2012 | Dec 2024 | Wind |
| Fairfield Wind | Greenbacker Renewable Energy Corporation | Fairfield, MT | 26 GWh | Apr 2014 | Dec 2024 | Wind |
| Musselshell Wind Project | Musselshell Wind Project LLC | Shawmut, MT | 23 GWh | Nov 2012 | Dec 2024 | Wind |
| Turnbull Hydro | Turnbull Hydro LLC | Fairfield, MT | 19 GWh | May 2011 | Aug 2024 | Water |
| Flint Creek Hydroelectric LLC | Hydrodynamics Inc | Philipsburg, MT | 11 GWh | Feb 2013 | Dec 2024 | Water |
| Great Divide Solar, LLC | Adapture Renewables, Inc. | Canyon Creek, MT | 6 GWh | Aug 2017 | Dec 2025 | Solar |
| Green Meadow Solar, LLC | Adapture Renewables, Inc. | Helena, MT | 5 GWh | Mar 2017 | Dec 2025 | Solar |
| Western Sugar Cooperative - Billings | Western Sugar Cooperative - Billings | Billings, MT | 5 GWh | Feb 2011 | Dec 2024 | Subbituminous Coal : 85.3% Natural Gas : 14.7% |
| Black Eagle Solar, LLC | Adapture Renewables, Inc. | Black Eagle, MT | 5 GWh | Aug 2017 | Dec 2025 | Solar |
| South Mills Solar, LLC | Adapture Renewables, Inc. | Hardin, MT | 5 GWh | Mar 2017 | Dec 2025 | Solar |
| Magpie Solar, LLC | Adapture Renewables, Inc. | Lavina, MT | 5 GWh | Aug 2017 | Dec 2025 | Solar |
| Two Dot Wind Broadview East LLC | Two Dot Wind Broadview East LLC | Broadview, MT | 4 GWh | Sep 2018 | Dec 2023 | Wind |
| South Dry Creek Hydro | Hydrodynamics Inc | Red Lodge, MT | 4 GWh | Aug 1985 | Nov 2024 | Water |
| GCC Trident Solar Project | GCC Trident LLC | Three Forks, MT | 4 GWh | Nov 2022 | Dec 2024 | Solar |
| River Bend Solar, LLC (MT) | Adapture Renewables, Inc. | Reed Point, MT | 3 GWh | Mar 2017 | Dec 2025 | Solar |
| Lake (WY) | NorthWestern Energy (MT wind/thermal) | Yellowstone, WY | 515 MWh | Aug 1967 | Dec 2024 | Distillate Fuel Oil |
| Old Faithful | NorthWestern Energy (MT wind/thermal) | Yellowstone, WY | 273 MWh | Nov 1979 | Dec 2024 | Distillate Fuel Oil |
| Horseshoe Bend Wind Park | Cycle Holdings, LLC | Great Falls, MT | 108 MWh | Jan 2006 | Dec 2024 | Wind |
Surrounding Balancing Authorities
| Rank | Balancing Authority | Annual Net Generation | # Power Plants |
|---|---|---|---|
| #42 | Avista Corporation | 8.8 TWh | 33 |
| #33 | Gridforce Energy Management, LLC | 16.8 TWh | 1 |
| #35 | Idaho Power Company | 15.0 TWh | 168 |
| #61 | NaturEner Power Watch, LLC | 552.4 GWh | 2 |
| #63 | NaturEner Wind Watch, LLC | 244.4 GWh | 1 |
| #18 | PacifiCorp East | 60.9 TWh | 216 |
| #43 | Public Utility District No. 1 of Chelan County | 8.6 TWh | 4 |
| #40 | Public Utility District No. 2 of Grant County, Washington | 9.6 TWh | 5 |
| #53 | PUD No. 1 of Douglas County | 4.0 TWh | 3 |
| #62 | Western Area Power Administration - Upper Great Plains West | 385.1 GWh | 24 |
Balancing Authorities with Similar Net Generation
| Rank | Balancing Authority | Annual Net Generation | # Power Plants |
|---|---|---|---|
| #27 | Associated Electric Cooperative, Inc. | 24.1 TWh | 47 |
| #28 | Tampa Electric Company | 20.8 TWh | 59 |
| #29 | South Carolina Public Service Authority | 18.4 TWh | 34 |
| #30 | Florida Municipal Power Pool | 18.3 TWh | 22 |
| #31 | Los Angeles Department of Water and Power | 18.3 TWh | 124 |
| #32 | NorthWestern Corporation | 17.8 TWh | 69 |
| #33 | Gridforce Energy Management, LLC | 16.8 TWh | 1 |
| #34 | Public Service Company of New Mexico | 15.4 TWh | 116 |
| #35 | Idaho Power Company | 15.0 TWh | 168 |
| #36 | Seminole Electric Cooperative | 14.6 TWh | 5 |