Seabrook
Nuclear power plant · Rockingham County, New Hampshire
Details
- Primary fuel
- Nuclear
- Technology
- Nuclear
- Operator
- NextEra Energy Seabrook LLC
- County
- Rockingham County
- Generating units
- 1
- Share of state capacity
- 27.10%
- Rank among nuclear plants in New Hampshire
- #1 of 1
- EIA plant code
- 6115
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Nuclear | 1,242 MW | 1,247 MW | 1990 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in New Hampshire
| Granite Ridge | Natural gas | 790 MW |
| Newington Energy Center | Natural gas | 606 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 1,242 MW solar plant and a 1,242 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All New Hampshire power plants · What New Hampshire actually generates