Cascade Dam (ID)
Hydro power plant · Valley County, Idaho
Nameplate capacity
12 MW
Rank in Idaho
#82
of 155 plants
In service since
1983
December 1983
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Idaho Power Co
- County
- Valley County
- Generating units
- 2
- Share of state capacity
- 0.19%
- Rank among hydro plants in Idaho
- #27 of 76
- EIA plant code
- 813
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 6.2 MW | 7.2 MW | 1984 | Operating |
| 2 | Conventional Hydroelectric | 6.2 MW | 6.4 MW | 1983 | 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
| Oregon Trail Wind Park | Wind | 14 MW |
| Amalgamated Sugar Twin Falls | Natural gas | 13 MW |
| Golden Valley Wind Park LLC | Wind | 12 MW |
| Thousand Springs Wind Park | Wind | 12 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 12 MW solar plant and a 12 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