Twin Falls Hydro
Hydro power plant · King County, Washington
Nameplate capacity
24 MW
Rank in Washington
#85
of 139 plants
In service since
1989
December 1989
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Central Rivers Power US, LLC
- County
- King County
- Generating units
- 2
- Share of state capacity
- 0.08%
- Rank among hydro plants in Washington
- #40 of 73
- EIA plant code
- 50827
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| UNI1 | Conventional Hydroelectric | 12 MW | 11 MW | 1989 | Operating |
| UNI2 | Conventional Hydroelectric | 12 MW | 11 MW | 1989 | 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
| Spokane Waste to Energy | Other | 26 MW |
| Boulder Park | Natural gas | 25 MW |
| Electron | Hydro | 23 MW |
| Adams Nielson Solar | Solar | 19 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 24 MW solar plant and a 24 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