Nameplate capacity
278 MW
Rank in Montana
#6
of 73 plants
In service since
1966
August 1966
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- U S Bureau of Reclamation
- County
- Big Horn County
- Generating units
- 4
- Share of state capacity
- 3.63%
- Rank among hydro plants in Montana
- #4 of 23
- EIA plant code
- 2204
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 72 MW | 72 MW | 1966 | Operating |
| 3 | Conventional Hydroelectric | 72 MW | 72 MW | 1966 | Operating |
| 4 | Conventional Hydroelectric | 72 MW | 72 MW | 1966 | Operating |
| 2 | Conventional Hydroelectric | 63 MW | 72 MW | 1966 | 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
| Hungry Horse | Hydro | 428 MW |
| Clearwater Wind I | Wind | 366 MW |
| Beaver Creek Wind Facility | Wind | 248 MW |
| Pryor Mountain Wind | Wind | 240 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 278 MW solar plant and a 278 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