Colstrip Energy LP
Coal power plant in Rosebud County, Montana. 46.1 MW of nameplate capacity across 1 generator, operated by Colstrip Energy LP.
Also known as Rosebud Power Plant · EIA plant 10784
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 46.1 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- February 1990First generator online
- Operator
- Colstrip Energy LPEIA operator ID 4217
- Grid
- NWMTBalancing authority NWMT
- Price nodes
- None linkedNo verified ISO node
- Location
- Rosebud County, MT45.9752, −106.6547
- EIA plant ID
- 10784EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Colstrip Energy LP produces
Free · EIA-923Net generation, 2025
278 GWh
277,536 MWh, final
Capacity factor, 2025
68.7%
2024: 71.0%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
189.9–327.6
GWh a year. Low 2017, high 2018
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 314,852 | Not reported | 12 of 12 |
| 2002 | 173,746 | Not reported | 12 of 12 |
| 2003 | 302,413 | Not reported | 12 of 12 |
| 2004 | 299,017 | Not reported | 12 of 12 |
| 2005 | 304,923 | Not reported | 12 of 12 |
| 2006 | 309,789 | Not reported | 12 of 12 |
| 2007 | 27,640 | Not reported | 1 of 12 |
| 2008 | 293,305 | Not reported | 12 of 12 |
| 2009 | 286,606 | Not reported | 12 of 12 |
| 2010 | 330,796 | Not reported | 12 of 12 |
| 2011 | 260,758 | 64.6% | 12 of 12 |
| 2012 | 301,608 | 74.5% | 12 of 12 |
| 2013 | 326,417 | 80.8% | 12 of 12 |
| 2014 | 309,480 | 76.6% | 12 of 12 |
| 2015 | 313,714 | 77.7% | 12 of 12 |
| 2016 | 313,013 | 77.3% | 12 of 12 |
| 2017 | 189,924 | 47.0% | 12 of 12 |
| 2018 | 327,552 | 81.1% | 12 of 12 |
| 2019 | 301,048 | 74.5% | 12 of 12 |
| 2020 | 272,160 | 67.2% | 12 of 12 |
| 2021 | 322,000 | 79.7% | 12 of 12 |
| 2022 | 291,747 | 72.2% | 12 of 12 |
| 2023 | 306,167 | 75.8% | 12 of 12 |
| 2024 | 287,519 | 71.0% | 12 of 12 |
| 2025 | 277,536 | 68.7% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GEN1 | Conventional Steam Coal | 46.1 | February 1990 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Colstrip Energy LP as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Colstrip Energy LP
How much power does Colstrip Energy LP produce?
Colstrip Energy LP reported 277,536 MWh (278 GWh) of net generation in 2025, a 68.7% capacity factor on 46.1 MW of nameplate capacity.
Where is Colstrip Energy LP?
Colstrip Energy LP is in Rosebud County, Montana, at 45.9752, −106.6547. It is in the NorthWestern Energy (NWMT) balancing area (NWMT).
Who operates Colstrip Energy LP?
EIA-860M for August 2026 lists Colstrip Energy LP as the operator (EIA operator ID 4217). The operator is not always the owner.
When did Colstrip Energy LP start operating?
Its first generator began operating in February 1990, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page