Cowlitz Falls
Hydro power plant · Lewis County, Washington
Nameplate capacity
70 MW
Rank in Washington
#64
of 139 plants
In service since
1994
June 1994
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- PUD No 1 of Lewis County
- County
- Lewis County
- Generating units
- 2
- Share of state capacity
- 0.22%
- Rank among hydro plants in Washington
- #28 of 73
- EIA plant code
- 7427
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| U#1 | Conventional Hydroelectric | 35 MW | 35 MW | 1994 | Operating |
| U#2 | Conventional Hydroelectric | 35 MW | 35 MW | 1994 | 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
| Goose Prairie Solar | Solar | 80 MW |
| Swift 2 | Hydro | 72 MW |
| Long Lake | Hydro | 70 MW |
| LaGrande | Hydro | 64 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 70 MW solar plant and a 70 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