Maine Independence Station
Natural gas power plant · Penobscot County, Maine
Nameplate capacity
550 MW
Rank in Maine
#3
of 274 plants
In service since
2000
May 2000
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combined Cycle
- Operator
- Casco Bay Energy Co LLC
- County
- Penobscot County
- Generating units
- 3
- Share of state capacity
- 8.93%
- Rank among natural gas plants in Maine
- #2 of 5
- EIA plant code
- 55068
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GEN3 | Natural Gas Fired Combined Cycle | 195 MW | 174 MW | 2000 | Operating |
| GEN1 | Natural Gas Fired Combined Cycle | 178 MW | 162 MW | 2000 | Operating |
| GEN2 | Natural Gas Fired Combined Cycle | 178 MW | 162 MW | 2000 | 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
| William F Wyman Hybrid | Other | 863 MW |
| Westbrook Energy Center Power Plant | Natural gas | 564 MW |
| Rumford Power LLC | Natural gas | 275 MW |
| Bucksport Generation LLC | Natural gas | 187 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 550 MW solar plant and a 550 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