Colstrip Energy LP
Coal power plant · Rosebud County, Montana
Nameplate capacity
46 MW
Rank in Montana
#36
of 73 plants
In service since
1990
February 1990
Details
- Primary fuel
- Coal
- Technology
- Conventional Steam Coal
- Operator
- Colstrip Energy LP
- County
- Rosebud County
- Generating units
- 1
- Share of state capacity
- 0.60%
- Rank among coal plants in Montana
- #3 of 4
- EIA plant code
- 10784
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GEN1 | Conventional Steam Coal | 46 MW | 38 MW | 1990 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Montana
| Basin Creek Plant | Natural gas | 55 MW |
| Holter | Hydro | 55 MW |
| Spion Kop Wind Farm | Wind | 40 MW |
| Diamond Willow Wind Facility | Wind | 30 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 46 MW solar plant and a 46 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Montana power plants · What Montana actually generates