2nd largest plant in New Hampshire · 433rd nationally
Granite Ridge is a natural gas power plant in New Hampshire with a nameplate capacity of 790 MW. It generates roughly 3.3M MWh per year — enough to power about 318,591 average U.S. homes.
Its capacity factor of 48% puts it in the middle range — running steadily but not full-time. At 856 lb CO₂/MWh, its emission rate sits above the national grid average of roughly 800 lb/MWh.
Ghost bars are each month's theoretical maximum (790 MW nameplate × hours in the month). Filled bars are actual net generation reported to EIA Form 923. The gap between them is capacity factor made visible.
| Plant Name | Granite Ridge |
|---|---|
| Operator | Granite Ridge Energy Llc |
| City | Londonderry |
| County | Rockingham County |
| State | New Hampshire |
| ZIP | 03053 |
| Coordinates | 42.90420, -71.42610 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| STG | Natural Gas Fired Combined Cycle | Natural Gas | 270 MW | Operating | 2003 |
| CT11 | Natural Gas Fired Combined Cycle | Natural Gas | 260 MW | Operating | 2003 |
| CT12 | Natural Gas Fired Combined Cycle | Natural Gas | 260 MW | Operating | 2003 |
| CO₂ | 1.4M metric tons |
|---|---|
| SO₂ | 7 metric tons |
| NOₓ | 114 metric tons |
| CO₂ Rate | 856 lb/MWh |
Annual totals and CO₂ rate reported by EPA eGRID for 2023. Reference averages are approximate U.S.-wide figures from the same dataset.
| NERC Region | NPCC |
|---|---|
| Balancing Authority | Iso New England Inc. |
Natural gas plants are the workhorse of the modern grid. Combined-cycle units achieve very high efficiency and can ramp up and down quickly to balance variable renewables. They emit roughly half the CO₂ per MWh of coal and far less of other pollutants, but they still release upstream methane during fuel extraction.