William F Wyman Hybrid
Other power plant · Cumberland County, Maine
Nameplate capacity
863 MW
Rank in Maine
#1
of 274 plants
In service since
1957
January 1957
Details
- Primary fuel
- Other
- Technology
- Petroleum Liquids
- Operator
- FPL Energy Wyman LLC
- County
- Cumberland County
- Generating units
- 5
- Share of state capacity
- 14.00%
- Rank among other plants in Maine
- #1 of 19
- EIA plant code
- 1507
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 4 | Petroleum Liquids | 632 MW | 602 MW | 1978 | Operating |
| 3 | Petroleum Liquids | 114 MW | 111 MW | 1965 | Operating |
| 1 | Petroleum Liquids | 50 MW | 50 MW | 1957 | Operating |
| 2 | Petroleum Liquids | 50 MW | 48 MW | 1958 | Operating |
| BESS | Batteries | 17 MW | 16 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
| Westbrook Energy Center Power Plant | Natural gas | 564 MW |
| Maine Independence Station | Natural gas | 550 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 863 MW solar plant and a 863 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