Nameplate capacity
450 MW
Rank in Washington
#17
of 139 plants
In service since
1952
December 1952
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- City of Seattle - (WA)
- County
- Whatcom County
- Generating units
- 4
- Share of state capacity
- 1.42%
- Rank among hydro plants in Washington
- #13 of 73
- EIA plant code
- 6202
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 41 | Conventional Hydroelectric | 113 MW | 113 MW | 1956 | Operating |
| 42 | Conventional Hydroelectric | 113 MW | 113 MW | 1954 | Operating |
| 43 | Conventional Hydroelectric | 113 MW | 113 MW | 1953 | Operating |
| 44 | Conventional Hydroelectric | 113 MW | 113 MW | 1952 | 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
| Ice Harbor | Hydro | 603 MW |
| Chehalis Generating Facility | Natural gas | 593 MW |
| Fredonia (WA) | Natural gas | 376 MW |
| Lower Snake River Wind Energy Project | Wind | 343 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 450 MW solar plant and a 450 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