Power Plants in New Hampshire

New Hampshire's power sector in numbers

Bywatts maps 59 operating power plants with 4.6 GW of nameplate capacity in New Hampshire. Natural Gas leads with 33% of that capacity across 3 plants, followed by Nuclear (27%) and Coal (14%). The inventory also includes 3 plants (7 MW) that EIA-860 lists as retired, the largest being WHEELABRATOR CLAREMONT FACILITY (5 MW, retired 2013).

The largest operating plants are SEABROOK (1,242 MW, Nuclear, NEXTERA ENERGY SEABROOK LLC), GRANITE RIDGE (900 MW, Natural Gas, GRANITE RIDGE ENERGY LLC) and EP NEWINGTON ENERGY LLC (606 MW, Natural Gas).

Of the 58 operating plants with a recorded commissioning year, 8 came online in 2000 or later and 3 in 2010 or later; the busiest decade for new capacity was the 2000s (1.5 GW).

The largest operators by operating capacity are NEXTERA ENERGY SEABROOK LLC (1 plant, 1.2 GW), PUBLIC SERVICE CO OF NH (13 plants, 1.2 GW) and GRANITE RIDGE ENERGY LLC (1 plant, 900 MW).

Retail electricity sales in New Hampshire reached 11.1 TWh in 2025, up 1.0% over ten years and up 1.8% year on year; residential customers took 45.4% of it. The average retail price across all sectors was 21.59 cents per kWh, up 34.7% since 2015.

The database also maps 6 named substations (2 of the 3 with a recorded voltage are rated 345 kV or above), 1 data center (operated by G4 Communications), 67 solar installers and 14 solar companies in New Hampshire.

Operating capacity by fuel

Retail electricity sales

Sources: HIFLD power-plant inventory (capacity, fuel, operator), EIA-860 (commissioning year, retirements, operable capacity), EIA retail sales and revenue series through January 2026. Counts are of plants Bywatts lists, not every generator in the state.