Granite Ridge
Rockingham County, New Hampshire · EIA plant ID 55170 · Operator: Granite Ridge Energy LLC
Nameplate790MWSummer 668 MW
Generators3in service
Net generation3,902GWh12 mo to Aug 2026
Capacity factor67%gas/coal/oil units, summer MW
Heat rate7,604Btu/kWhfossil units, electric fuel, HHV
First online2003Runs as baseload
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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) |
|---|---|---|---|
| 2003 | 1,777.7 | 30.4% | 7,777 |
| 2004 | 2,750.2 | 39.3% | 7,454 |
| 2005 | 4,056.3 | 58.1% | 7,148 |
| 2006 | 3,204.2 | 45.9% | 7,125 |
| 2007 | 2,714.4 | 38.9% | 7,257 |
| 2008 | 4,546.9 | 78.3% | 7,142 |
| 2009 | 3,912.1 | 67.6% | 7,214 |
| 2010 | 3,241.1 | 54.6% | 7,384 |
| 2011 | 3,839.8 | 64.6% | 7,231 |
| 2012 | 4,824.8 | 81.0% | 7,304 |
| 2013 | 3,367.2 | 56.7% | 7,449 |
| 2014 | 3,534.4 | 59.5% | 7,319 |
| 2015 | 4,686.8 | 78.9% | 7,251 |
| 2016 | 3,367.6 | 56.5% | 7,346 |
| 2017 | 2,738.5 | 46.1% | 7,486 |
| 2018 | 2,177.5 | 36.7% | 7,429 |
| 2019 | 3,025.6 | 50.9% | 7,384 |
| 2020 | 3,136.6 | 52.7% | 7,427 |
| 2021 | 3,193.2 | 53.8% | 7,443 |
| 2022 | 3,433.8 | 57.8% | 7,330 |
| 2023 | 3,345.2 | 57.2% | 7,585 |
| 2024 | 3,137.7 | 53.5% | 7,423 |
| 2025 | 3,398.4 | 58.1% | 7,537 |
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 |
|---|---|---|---|---|---|---|---|---|
| CT11 | Natural Gas Fired Combined Cycle | CT | 260 | 218 | Mar 2003 | Operating | — | coming soon |
| CT12 | Natural Gas Fired Combined Cycle | CT | 260 | 218 | Mar 2003 | Operating | — | coming soon |
| STG | Natural Gas Fired Combined Cycle | CA | 270 | 232 | Mar 2003 | Operating | — | coming soon |
Owner / operator
Operator: Granite Ridge Energy LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Granite Ridge Energy LLC | 100.0% | 790 MW |
Nearby plants
Within 80 km.
| Amoskeag | 16 MW | 11.5 km |
| Merrimack Solar Farm, LLC | 2 MW | 12 km |
| Gregg Falls | 4 MW | 17 km |
| Mine Falls Generating Station | 3 MW | 18.3 km |
| Nashua Plant | 2 MW | 20.7 km |
| Hooksett | 2 MW | 22.2 km |