Summer Falls Power Plant
Hydro power plant · Grant County, Washington
Nameplate capacity
92 MW
Rank in Washington
#58
of 139 plants
In service since
1985
January 1985
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Columbia Basin Hydropower
- County
- Grant County
- Generating units
- 2
- Share of state capacity
- 0.29%
- Rank among hydro plants in Washington
- #24 of 73
- EIA plant code
- 56695
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 46 MW | 46 MW | 1985 | Operating |
| 2 | Conventional Hydroelectric | 46 MW | 46 MW | 1985 | 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 Washington
| Harvest Wind Project | Wind | 99 MW |
| Nine Canyon | Wind | 96 MW |
| Box Canyon | Hydro | 90 MW |
| Vantage Wind Energy LLC | Wind | 90 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 92 MW solar plant and a 92 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 Washington power plants · What Washington actually generates