Williams Hydro
Hydro power plant · Somerset County, Maine
Nameplate capacity
13 MW
Rank in Maine
#59
of 274 plants
In service since
1939
January 1939
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Brookfield White Pine Hydro LLC
- County
- Somerset County
- Generating units
- 2
- Share of state capacity
- 0.21%
- Rank among hydro plants in Maine
- #14 of 48
- EIA plant code
- 1510
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| WI1 | Conventional Hydroelectric | 7.0 MW | 8.2 MW | 1939 | Operating |
| WI2 | Conventional Hydroelectric | 6.0 MW | 6.7 MW | 1950 | 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 Maine
| Regional Waste Systems | Other | 13 MW |
| West Enfield Hydro | Hydro | 13 MW |
| Weston Hydro | Hydro | 12 MW |
| Hiram | Hydro | 11 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 13 MW solar plant and a 13 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 Maine power plants · What Maine actually generates