Seabrook
Seabrook is a nuclear plant in Rockingham County, New Hampshire, operated by NextEra Energy Seabrook LLC. No other power plant in New Hampshire has more nameplate capacity; the state has 61 in all. Its biggest unit, rated at 1,242 MW, is the largest single generator in New Hampshire. Ownership is shared by four organizations; the largest stake, 88%, is held by NextEra Energy Seabrook LLC. Within the ISO New England balancing area it is the third-largest of 1,475 plants.
Nameplate capacity, 2025
1,242 MW
1,247 MW net summer capacity
1 operable unit
- Nuclear1,242 MW100%
Unit by unit, 1990 to 2025
operating in 2025bar height follows unit size
Among New Hampshire’s plants
Largest plants in the state by nameplate capacity, with the plants ranked next to this one.
- 1Seabrookthis plant
- 2Granite Ridge790 MW
- 3Newington Energy Center606 MW
Other rankings
- All US power plants
- 205th of 14,286
- US nuclear plants
- 40th of 56
Operable units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Nuclear | 1,242 MW | 1,247 MW | 1990 | Operating |
Who owns it
Shares are weighted by the nameplate capacity of each unit an owner holds.
| Owner | Share of capacity |
|---|---|
| NextEra Energy Seabrook LLC | 88.2% |
| Massachusetts Mun Wholes Electric Co | 11.6% |
| City of Taunton (MA) | 0.1% |
| Town of Hudson (MA) | 0.1% |
Grid and site
- Balancing area
- ISO New England
- Reliability region
- Northeast Power Coordinating Council
- Highest grid connection voltage
- 345 kV
- Water source
- Atlantic Ocean
- Nearest town on record
- Seabrook
- Operator type
- Independent producer
- Coordinates
- 42.899°N, 70.849°W
Closest plants
| Plant | Runs on | Capacity | Distance |
|---|---|---|---|
| Hampton Facility | Natural gas | 5 MW | 2.7 mi north |
| True North | Solar | 4.8 MW | 4.4 mi southwest |
| Kearsarge Amesbury Hybrid | Solar | 4.9 MW | 6.2 mi southwest |
| Hunt Road Solar | Solar | 4.5 MW | 7.4 mi southwest |
| Bashaw Solar CSG 1, LLC | Solar | 2 MW | 7.8 mi south |
| Merrimac Solar | Solar | 1.5 MW | 8.6 mi southwest |
| Ipswich Wind Turbine | Wind | 1.6 MW | 12.6 mi south |
| High Street Station | Natural gas | 10.9 MW | 13.9 mi south |