Lilliwaup Falls Generating
Hydro power plant · Mason County, Washington
Nameplate capacity
1.4 MW
Rank in Washington
#137
of 139 plants
In service since
1986
May 1986
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- William G. Reed Jr
- County
- Mason County
- Generating units
- 7
- Share of state capacity
- 0.00%
- Rank among hydro plants in Washington
- #72 of 73
- EIA plant code
- 50700
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 4735 | Conventional Hydroelectric | 0.2 MW | 0.2 MW | 1986 | Operating |
| 4736 | Conventional Hydroelectric | 0.2 MW | 0.2 MW | 1986 | Operating |
| 4737 | Conventional Hydroelectric | 0.2 MW | 0.2 MW | 1986 | Operating |
| 4738 | Conventional Hydroelectric | 0.2 MW | 0.2 MW | 1986 | Operating |
| 4739 | Conventional Hydroelectric | 0.2 MW | 0.2 MW | 1986 | Operating |
| 4740 | Conventional Hydroelectric | 0.2 MW | 0.2 MW | 1986 | Operating |
| 4741 | Conventional Hydroelectric | 0.2 MW | 0.2 MW | 1986 | 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
| Arlington Microgrid | Battery storage | 1.5 MW |
| Nooksack Hydro | Hydro | 1.5 MW |
| Biotech LS 0836 | Other | 1.0 MW |
| Skookumchuck | Hydro | 1.0 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 1.4 MW solar plant and a 1.4 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