Raft River Geothermal Power Plant
Other power plant · Cassia County, Idaho
Nameplate capacity
16 MW
Rank in Idaho
#73
of 155 plants
In service since
2025
April 2025
Details
- Primary fuel
- Other
- Technology
- Geothermal
- Operator
- US Geothermal Inc.
- County
- Cassia County
- Generating units
- 1
- Share of state capacity
- 0.24%
- Rank among other plants in Idaho
- #2 of 14
- EIA plant code
- 56317
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| OEC1 | Geothermal | 16 MW | 11 MW | 2025 | 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 Idaho
| Tuana Springs | Wind | 17 MW |
| Upper Salmon B | Hydro | 17 MW |
| Simplot Leasing Don Plant | Other | 16 MW |
| Arrowrock Hydroelectric Project | Hydro | 15 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 16 MW solar plant and a 16 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 Idaho power plants · What Idaho actually generates