Somerset Plant
Wood biomass power plant in Somerset County, Maine. 107.1 MW of nameplate capacity across 2 generators, operated by Sappi Fine Paper North America-Somerset.
Also known as Sappi Somerset Plant · EIA plant 50406
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 107.1 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- January 1976First generator online
- Operator
- Sappi Fine Paper North America-SomersetEIA operator ID 16190
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 1 ISONE nodeResource nodes with prices
- Location
- Somerset County, ME44.7035, −69.6474
- EIA plant ID
- 50406EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Somerset Plant produces
Free · EIA-923Net generation, 2025
552 GWh
552,121 MWh, final
Capacity factor, 2025
58.8%
2024: 56.0%
January to July 2026
338 GWh
Provisional
Range, 2015 to 2025
485.4–560.2
GWh a year. Low 2023, high 2021
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 782,755 | Not reported | 12 of 12 |
| 2001 | 726,286 | Not reported | 12 of 12 |
| 2002 | 833,280 | Not reported | 12 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | 748,558 | Not reported | 12 of 12 |
| 2005 | 757,193 | Not reported | 12 of 12 |
| 2006 | 746,052 | Not reported | 12 of 12 |
| 2007 | 742,076 | Not reported | 12 of 12 |
| 2008 | 61,064 | Not reported | 1 of 12 |
| 2009 | 583,732 | Not reported | 12 of 12 |
| 2010 | 575,746 | 56.2% | 12 of 12 |
| 2011 | 621,423 | 60.7% | 12 of 12 |
| 2012 | 619,700 | 60.3% | 12 of 12 |
| 2013 | 566,977 | 55.4% | 12 of 12 |
| 2014 | 217,755 | 64.7% | 4 of 12 |
| 2015 | 510,282 | 49.8% | 12 of 12 |
| 2016 | 300,595 | Not reported | 7 of 12 |
| 2017 | 526,475 | 56.1% | 12 of 12 |
| 2018 | 538,845 | 57.4% | 12 of 12 |
| 2019 | 531,715 | 56.7% | 12 of 12 |
| 2020 | 526,487 | 56.0% | 12 of 12 |
| 2021 | 560,162 | 59.7% | 12 of 12 |
| 2022 | 514,665 | 54.9% | 12 of 12 |
| 2023 | 485,440 | 51.7% | 12 of 12 |
| 2024 | 527,248 | 56.0% | 12 of 12 |
| 2025 | 552,121 | 58.8% | 12 of 12 |
| 2026 (provisional, partial year) | 338,294 | 62.1% | 7 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 CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
2,488
million gallons
Consumption, 2024
469
million gallons
Source
Kennebec River
Mixed, Mixed. Mixed systems
Watershed stress
Very low/none · 0.119
USGS SUI, HUC12 Eaton Ridge-Kennebec River
12 of 12 cooling months report withdrawal. SUI of the HUC12 containing the plant. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GEN1 | Wood/Wood Waste Biomass | 45.9 | January 1976 |
| GEN2 | Wood/Wood Waste Biomass | 61.2 | October 1990 |
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 Sappi Fine Paper North America-Somerset 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 Somerset Plant
Questions about Somerset Plant
How much power does Somerset Plant produce?
Somerset Plant reported 552,121 MWh (552 GWh) of net generation in 2025, a 58.8% capacity factor on 107.1 MW of nameplate capacity. From January to July 2026 it reported 338 GWh, which is provisional.
Where is Somerset Plant?
Somerset Plant is in Somerset County, Maine, at 44.7035, −69.6474. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Somerset Plant?
EIA-860M for August 2026 lists Sappi Fine Paper North America-Somerset as the operator (EIA operator ID 16190). The operator is not always the owner.
When did Somerset Plant start operating?
Its first generator began operating in January 1976, according to EIA-860M.
Does InfraMap have power prices for Somerset Plant?
Yes. InfraMap has ISONE day-ahead and real-time prices at 1 price node linked to Somerset Plant, 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)
- 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