Stillwater Hydro Station
Hydro power plant · Penobscot County, Maine
Nameplate capacity
1.8 MW
Rank in Maine
#249
of 274 plants
In service since
1929
January 1929
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Brookfield Black Bear Hydro, LLC
- County
- Penobscot County
- Generating units
- 4
- Share of state capacity
- 0.03%
- Rank among hydro plants in Maine
- #38 of 48
- EIA plant code
- 1478
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| SW04 | Conventional Hydroelectric | 0.6 MW | 0.6 MW | 1929 | Operating |
| SW01 | Conventional Hydroelectric | 0.4 MW | 0.5 MW | 2013 | Operating |
| SW02 | Conventional Hydroelectric | 0.4 MW | 0.5 MW | 2013 | Operating |
| SW03 | Conventional Hydroelectric | 0.4 MW | 0.5 MW | 2016 | 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
| Messalonskee 5 | Hydro | 1.8 MW |
| Richmond Hill | Solar | 1.8 MW |
| Mariaville Road Elsworth Solar, LLC | Solar | 1.6 MW |
| Messalonskee 3 | Hydro | 1.6 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 1.8 MW solar plant and a 1.8 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