Maine Independence Station
Penobscot County, Maine · EIA plant ID 55068 · Operator: Casco Bay Energy Co LLC
Nameplate550MWSummer 498 MW
Generators3in service
Net generation1,433GWh12 mo to Dec 2025
Capacity factor33%gas/coal/oil units, summer MW
Heat rate7,278Btu/kWhfossil units, electric fuel, HHV
First online2000Runs as intermediate
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 3,349.1 | — | — |
| 2002 | 3,766.8 | — | — |
| 2003 | 2,381.6 | 55.5% | 7,141 |
| 2004 | 2,740.1 | 63.7% | 7,066 |
| 2005 | 2,655.7 | 61.9% | 7,144 |
| 2006 | 2,187.9 | 51.0% | 7,270 |
| 2007 | 1,903.2 | 44.3% | 7,272 |
| 2008 | 1,656.6 | 38.5% | 7,341 |
| 2009 | 2,329.6 | 54.3% | 7,176 |
| 2010 | 2,657.6 | 61.9% | 7,204 |
| 2011 | 1,775.9 | 41.4% | 7,370 |
| 2012 | 1,243.5 | 28.9% | 7,308 |
| 2013 | 362.2 | 8.4% | 7,592 |
| 2014 | 1,111.6 | 25.9% | 7,352 |
| 2015 | 330.4 | 7.7% | 7,723 |
| 2016 | 551.2 | 12.8% | 7,670 |
| 2017 | 332.2 | 7.7% | 7,621 |
| 2018 | 234.9 | 5.5% | 7,625 |
| 2019 | 274 | 6.4% | 7,838 |
| 2020 | 180.6 | 4.2% | 7,813 |
| 2021 | 534.7 | 12.4% | 7,535 |
| 2022 | 669.6 | 15.5% | 7,388 |
| 2023 | 936.9 | 21.4% | 7,460 |
| 2024 | 2,546.8 | 59.0% | 7,230 |
| 2025 | 1,433.4 | 32.9% | 7,278 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Natural Gas Fired Combined Cycle | CT | 177.8 | 161.8 | May 2000 | Operating | — | coming soon |
| GEN2 | Natural Gas Fired Combined Cycle | CT | 177.8 | 162.1 | May 2000 | Operating | — | coming soon |
| GEN3 | Natural Gas Fired Combined Cycle | CA | 194.6 | 173.7 | May 2000 | Operating | — | coming soon |
Owner / operator
Operator: Casco Bay Energy Co LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Casco Bay Energy Co LLC | 100.0% | 550 MW |
Nearby plants
Within 80 km.
| ME CDG 005 | 2 MW | 2 km |
| Brewer (CSG) | 5 MW | 3 km |
| Eastern Maine Medical Center | 4 MW | 3.7 km |
| Orono Hydro Station | 3 MW | 7.2 km |
| Orono B | 4 MW | 7.6 km |
| ME CDG 004 | 2 MW | 7.7 km |