Nameplate capacity
207 MW
Rank in Washington
#31
of 139 plants
In service since
1929
May 1929
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- City of Seattle - (WA)
- County
- Whatcom County
- Generating units
- 4
- Share of state capacity
- 0.65%
- Rank among hydro plants in Washington
- #16 of 73
- EIA plant code
- 6431
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 24 | Conventional Hydroelectric | 97 MW | 97 MW | 1951 | Operating |
| 21 | Conventional Hydroelectric | 37 MW | 32 MW | 2024 | Operating |
| 22 | Conventional Hydroelectric | 37 MW | 32 MW | 2024 | Operating |
| 23 | Conventional Hydroelectric | 37 MW | 32 MW | 1929 | 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
| Swift 1 | Hydro | 240 MW |
| Marengo Wind Plant | Wind | 234 MW |
| White Creek Wind Farm | Wind | 204 MW |
| Big Horn Wind Project | Wind | 199 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 207 MW solar plant and a 207 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