Upper Salmon A
Hydro power plant · Twin Falls County, Idaho
Nameplate capacity
18 MW
Rank in Idaho
#69
of 155 plants
In service since
1937
September 1937
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Idaho Power Co
- County
- Twin Falls County
- Generating units
- 2
- Share of state capacity
- 0.27%
- Rank among hydro plants in Idaho
- #20 of 76
- EIA plant code
- 822
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 9.0 MW | 9.4 MW | 1937 | Operating |
| 2 | Conventional Hydroelectric | 9.0 MW | 8.2 MW | 1937 | 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
| Milner Dam Wind Park LLC | Wind | 20 MW |
| Cassia Gulch | Wind | 19 MW |
| IFP Peaking Plant | Natural gas | 18 MW |
| Tuana Springs | Wind | 17 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 18 MW solar plant and a 18 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