Merrimack
Coal and oil power plant in Merrimack County, New Hampshire. 150.8 MW of nameplate capacity across 3 generators, operated by Granite Shore Power.
Also known as EIA plant 2364
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Key facts
- Capacity
- 150.8 MWCoal 113.6 · Oil 37.2
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- December 1960First generator online
- Operator
- Granite Shore PowerEIA operator ID 62032
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 3 ISONE nodesResource nodes with prices
- Location
- Merrimack County, NH43.1411, −71.4692
- EIA plant ID
- 2364EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Merrimack produces
Free · EIA-923Net generation, 2025
Not reported
Not reported MWh, final. 0 of 12 months reported
Capacity factor, 2025
Not reported
2024: Not reported
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2016 to 2021
128.7–360.4
GWh a year. Low 2020, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 3,110,777 | Not reported | 12 of 12 |
| 2001 | 2,934,532 | Not reported | 12 of 12 |
| 2002 | 2,877,447 | Not reported | 12 of 12 |
| 2003 | 2,681,813 | Not reported | 11 of 12 |
| 2004 | 3,127,790 | Not reported | 12 of 12 |
| 2005 | 3,117,899 | Not reported | 12 of 12 |
| 2006 | 3,161,701 | Not reported | 12 of 12 |
| 2007 | 3,288,344 | Not reported | 12 of 12 |
| 2008 | 2,853,529 | Not reported | 12 of 12 |
| 2009 | 2,410,959 | Not reported | 12 of 12 |
| 2010 | 2,668,374 | 61.4% | 12 of 12 |
| 2011 | 1,983,066 | 45.6% | 12 of 12 |
| 2012 | 1,186,281 | 27.2% | 12 of 12 |
| 2013 | 1,318,603 | 30.3% | 12 of 12 |
| 2014 | 1,152,850 | 26.5% | 12 of 12 |
| 2015 | 154,368 | 41.8% | 1 of 12 |
| 2016 | 360,409 | 8.3% | 12 of 12 |
| 2017 | 238,241 | 5.5% | 12 of 12 |
| 2018 | 549,623 | 13.8% | 11 of 12 |
| 2019 | 301,655 | 6.9% | 12 of 12 |
| 2020 | 128,661 | 3.0% | 12 of 12 |
| 2021 | 285,553 | 6.6% | 12 of 12 |
| 2022 | 30,228 | 8.2% | 1 of 12 |
| 2023 | Not reported | Not reported | 0 of 12 |
| 2024 | Not reported | Not reported | 0 of 12 |
| 2025 | Not reported | Not reported | 0 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, 2024
Not reported
US short tons. 2023: Not reported
SO₂, 2024
Not reported
US short tons
NOx, 2024
458
US short tons
2 of 4 EPA units reported CO₂ in 2024 (1, 2, CT1, CT2), matched to EIA plant 2364 through the EPA–EIA crosswalk.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
Not reported
million gallons as reported; not used, see note
Consumption, 2024
Not reported
million gallons
Source
Merrimack River
Surface, Fresh
Watershed stress
Very low/none · 0.133
USGS SUI, HUC12 Bow Bog Brook-Merrimack River
0 of 24 cooling months report withdrawal. SUI of the source river HUC12 within 3 km. Consumption is below 5% of a large reported withdrawal, so the withdrawal is not used. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Steam Coal | 113.6 | December 1960 |
| GT1 | Petroleum Liquids | 18.6 | August 1968 |
| GT2 | Petroleum Liquids | 18.6 | August 1969 |
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 Granite Shore Power 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 Merrimack
More plants operated by Granite Shore Power
Questions about Merrimack
Where is Merrimack?
Merrimack is in Merrimack County, New Hampshire, at 43.1411, −71.4692. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Merrimack?
EIA-860M for August 2026 lists Granite Shore Power as the operator (EIA operator ID 62032). The operator is not always the owner.
Is Merrimack a coal or a oil plant?
Both. Coal capacity totals 113.6 MW and oil capacity totals 37.2 MW.
When did Merrimack start operating?
Its first generator began operating in December 1960, according to EIA-860M.
Does InfraMap have power prices for Merrimack?
Yes. InfraMap has ISONE day-ahead and real-time prices at 3 price nodes linked to Merrimack, 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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page