Upper Salmon B
Hydro power plant · Twin Falls County, Idaho
Nameplate capacity
17 MW
Rank in Idaho
#72
of 155 plants
In service since
1947
September 1947
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Idaho Power Co
- County
- Twin Falls County
- Generating units
- 2
- Share of state capacity
- 0.25%
- Rank among hydro plants in Idaho
- #21 of 76
- EIA plant code
- 7079
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 2 | Conventional Hydroelectric | 8.3 MW | 9.3 MW | 1947 | Operating |
| 1 | Conventional Hydroelectric | 8.2 MW | 9.3 MW | 1947 | 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
| IFP Peaking Plant | Natural gas | 18 MW |
| Tuana Springs | Wind | 17 MW |
| Raft River Geothermal Power Plant | Other | 16 MW |
| Simplot Leasing Don Plant | Other | 16 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 17 MW solar plant and a 17 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