Granite Ridge
Natural gas power plant in Rockingham County, New Hampshire. 790 MW of nameplate capacity across 3 generators, operated by Granite Ridge Energy LLC.
Also known as EIA plant 55170
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Key facts
- Capacity
- 790 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- March 2003First generator online
- Operator
- Granite Ridge Energy LLCEIA operator ID 88
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 2 ISONE nodesResource nodes with prices
- Location
- Rockingham County, NH42.9042, −71.4261
- EIA plant ID
- 55170EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Granite Ridge produces
Free · EIA-923Net generation, 2025
3.40 TWh
3,398,436 MWh, final
Capacity factor, 2025
49.1%
2024: 45.2%
January to July 2026
2.13 TWh
Provisional
Range, 2015 to 2025
2.2–4.7
TWh a year. Low 2018, high 2015
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | 1,777,712 | Not reported | 10 of 12 |
| 2004 | 2,750,187 | Not reported | 12 of 12 |
| 2005 | 4,056,252 | Not reported | 12 of 12 |
| 2006 | 3,204,189 | Not reported | 12 of 12 |
| 2007 | 2,714,389 | Not reported | 12 of 12 |
| 2008 | 1,646,485 | Not reported | 5 of 12 |
| 2009 | 3,912,071 | Not reported | 12 of 12 |
| 2010 | 3,241,127 | 41.1% | 12 of 12 |
| 2011 | 3,839,821 | 48.7% | 12 of 12 |
| 2012 | 4,824,841 | 61.0% | 12 of 12 |
| 2013 | 3,367,244 | Not reported | 12 of 12 |
| 2014 | 3,534,364 | Not reported | 12 of 12 |
| 2015 | 4,686,787 | 67.7% | 12 of 12 |
| 2016 | 3,367,594 | 48.5% | 12 of 12 |
| 2017 | 2,738,498 | 39.6% | 12 of 12 |
| 2018 | 2,177,483 | 31.5% | 12 of 12 |
| 2019 | 3,025,595 | 43.7% | 12 of 12 |
| 2020 | 3,136,622 | 45.2% | 12 of 12 |
| 2021 | 3,193,208 | 46.1% | 12 of 12 |
| 2022 | 3,433,772 | 49.6% | 12 of 12 |
| 2023 | 3,345,208 | 48.3% | 12 of 12 |
| 2024 | 3,137,690 | 45.2% | 12 of 12 |
| 2025 | 3,398,436 | 49.1% | 12 of 12 |
| 2026 (provisional, partial year) | 2,132,454 | 53.1% | 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 CAMPDCO₂, 2025
1.46M
US short tons. 2024: 1.33M
SO₂, 2025
7
US short tons
NOx, 2025
114
US short tons
CO₂ per MWh, calculated
0.43 t
About 858 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (1, 2), matched to EIA plant 55170 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
769
million gallons
Consumption, 2024
620
million gallons
Source
City of Manchester POTW
Discharge, Reclaimed. Induced-draft tower
Watershed stress
Very low/none · 0.129
USGS SUI, HUC12 Little Cohas Brook-Merrimack River
12 of 12 cooling months report withdrawal. Reclaimed water or plant effluent; not tested. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CT11 | Natural Gas Fired Combined Cycle | 260.0 | March 2003 |
| CT12 | Natural Gas Fired Combined Cycle | 260.0 | March 2003 |
| STG | Natural Gas Fired Combined Cycle | 270.0 | March 2003 |
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 Ridge Energy 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 Granite Ridge
Questions about Granite Ridge
How much power does Granite Ridge produce?
Granite Ridge reported 3,398,436 MWh (3.40 TWh) of net generation in 2025, a 49.1% capacity factor on 790 MW of nameplate capacity. From January to July 2026 it reported 2.13 TWh, which is provisional.
Where is Granite Ridge?
Granite Ridge is in Rockingham County, New Hampshire, at 42.9042, −71.4261. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Granite Ridge?
EIA-860M for August 2026 lists Granite Ridge Energy LLC as the operator (EIA operator ID 88). The operator is not always the owner.
When did Granite Ridge start operating?
Its first generator began operating in March 2003, according to EIA-860M.
Does InfraMap have power prices for Granite Ridge?
Yes. InfraMap has ISONE day-ahead and real-time prices at 2 price nodes linked to Granite Ridge, 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