Maine Independence Station
Natural gas power plant in Penobscot County, Maine. 550.2 MW of nameplate capacity across 3 generators, operated by Casco Bay Energy Co LLC.
Also known as Maine Independence Station Power Plant · EIA plant 55068
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Key facts
- Capacity
- 550.2 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- May 2000First generator online
- Operator
- Casco Bay Energy Co LLCEIA operator ID 4966
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 2 ISONE nodesResource nodes with prices
- Location
- Penobscot County, ME44.8242, −68.7094
- EIA plant ID
- 55068EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Maine Independence Station produces
Free · EIA-923Net generation, 2025
1.43 TWh
1,433,435 MWh, final
Capacity factor, 2025
29.7%
2024: 52.7%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
0.2–2.5
TWh a year. Low 2020, high 2024
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 470,108 | Not reported | 12 of 12 |
| 2001 | 3,349,109 | Not reported | 12 of 12 |
| 2002 | 3,766,773 | Not reported | 12 of 12 |
| 2003 | 2,381,633 | Not reported | 12 of 12 |
| 2004 | 2,740,089 | Not reported | 12 of 12 |
| 2005 | 2,655,734 | Not reported | 12 of 12 |
| 2006 | 2,187,905 | Not reported | 12 of 12 |
| 2007 | 1,903,233 | Not reported | 12 of 12 |
| 2008 | 1,656,642 | Not reported | 12 of 12 |
| 2009 | 2,329,559 | Not reported | 12 of 12 |
| 2010 | 2,657,587 | 55.1% | 12 of 12 |
| 2011 | 1,775,905 | 36.8% | 12 of 12 |
| 2012 | 1,243,500 | 25.7% | 12 of 12 |
| 2013 | 362,196 | Not reported | 12 of 12 |
| 2014 | 1,111,646 | 23.1% | 12 of 12 |
| 2015 | 330,358 | 6.9% | 12 of 12 |
| 2016 | 551,187 | 11.4% | 12 of 12 |
| 2017 | 332,225 | 6.9% | 12 of 12 |
| 2018 | 234,887 | 4.9% | 12 of 12 |
| 2019 | 273,976 | 5.7% | 12 of 12 |
| 2020 | 180,559 | Not reported | 12 of 12 |
| 2021 | 534,682 | 11.1% | 12 of 12 |
| 2022 | 669,598 | 13.9% | 12 of 12 |
| 2023 | 936,921 | 19.4% | 12 of 12 |
| 2024 | 2,546,844 | 52.7% | 12 of 12 |
| 2025 | 1,433,435 | 29.7% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · ISONEEmissions
Free · EPA CAMPDCO₂, 2025
616,184
US short tons. 2024: 1.09M
SO₂, 2025
3
US short tons
NOx, 2025
66
US short tons
CO₂ per MWh, calculated
0.43 t
About 860 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (1, 2), matched to EIA plant 55068 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
547
million gallons
Consumption, 2024
505
million gallons
Source
Penobscot River
Surface, Brackish. Induced-draft tower
Watershed stress
Very low/none · 0.119
USGS SUI, HUC12 Felts Brook-Penobscot River
12 of 12 cooling months report withdrawal. Saline, brackish or ocean intake; not tested. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GEN1 | Natural Gas Fired Combined Cycle | 177.8 | May 2000 |
| GEN2 | Natural Gas Fired Combined Cycle | 177.8 | May 2000 |
| GEN3 | Natural Gas Fired Combined Cycle | 194.6 | May 2000 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Casco Bay Energy Co LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near Maine Independence Station
Questions about Maine Independence Station
How much power does Maine Independence Station produce?
Maine Independence Station reported 1,433,435 MWh (1.43 TWh) of net generation in 2025, a 29.7% capacity factor on 550.2 MW of nameplate capacity.
Where is Maine Independence Station?
Maine Independence Station is in Penobscot County, Maine, at 44.8242, −68.7094. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Maine Independence Station?
EIA-860M for August 2026 lists Casco Bay Energy Co LLC as the operator (EIA operator ID 4966). The operator is not always the owner.
When did Maine Independence Station start operating?
Its first generator began operating in May 2000, according to EIA-860M.
Does InfraMap have power prices for Maine Independence Station?
Yes. InfraMap has ISONE day-ahead and real-time prices at 2 price nodes linked to Maine Independence Station, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page