Nameplate capacity
85 MW
Rank in Washington
#61
of 139 plants
In service since
1930
December 1930
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- City of Tacoma - (WA)
- County
- Mason County
- Generating units
- 5
- Share of state capacity
- 0.27%
- Rank among hydro plants in Washington
- #26 of 73
- EIA plant code
- 3915
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 31 | Conventional Hydroelectric | 27 MW | 30 MW | 1930 | Operating |
| 32 | Conventional Hydroelectric | 27 MW | 30 MW | 1931 | Operating |
| 33 | Conventional Hydroelectric | 27 MW | 30 MW | 1952 | Operating |
| 34 | Conventional Hydroelectric | 1.8 MW | 1.8 MW | 2013 | Operating |
| 35 | Conventional Hydroelectric | 1.8 MW | 1.8 MW | 2013 | 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
| Box Canyon | Hydro | 90 MW |
| Vantage Wind Energy LLC | Wind | 90 MW |
| Goose Prairie Solar | Solar | 80 MW |
| Swift 2 | Hydro | 72 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 85 MW solar plant and a 85 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