SEABROOK
OperatingNuclear power plant
- Capacity
- 1,242 MW
- Primary fuel
- Nuclear
- County
- Rockingham County
- Operator
- NEXTERA ENERGY SEABROOK LLC
- Status
- Operating
- Commissioned
- 1990
- EIA plant ID
- 6115
- Coordinates
- 42.8992, -70.8489
SEABROOK, a 1,242 MW Nuclear power plant in Rockingham County, New Hampshire. Operated by NEXTERA ENERGY SEABROOK LLC, commissioned 1990.
Weather peril exposure
SEABROOK is a 1,242 MW nuclear power plant in Rockingham County, NH, operated by NEXTERA ENERGY SEABROOK LLC, commissioned in 1990. Rockingham County carries moderate modeled catastrophe exposure in the FEMA National Risk Index, scoring 2.4 of 5 at the 34th national percentile. Coastal flooding is the leading peril, rated Relatively High by FEMA at the 96th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to a nuclear plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Rockingham County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Coastal flooding | Relatively High | 96th | 4.9 of 5 | 8.0 |
| Ice storm | Relatively High | 78th | 4.1 of 5 | 2.0 |
| Earthquake | Relatively Low | 76th | 4.0 of 5 | <0.01 |
| Hurricane | Relatively Moderate | 73rd | 3.9 of 5 | 0.14 |
| Lightning | Relatively Moderate | 61st | 3.4 of 5 | 19.8 |
| Riverine flooding | Relatively Moderate | 51st | 3.0 of 5 | 1.2 |
| Wildfire | Very Low | 27th | 2.1 of 5 | <0.01 |
| Strong wind | Relatively Moderate | 20th | 1.8 of 5 | 0.84 |
| Tornado | Relatively Moderate | 13th | 1.5 of 5 | 0.12 |
| Winter weather | Relatively Moderate | 10th | 1.4 of 5 | 17.1 |
| Heat wave | Relatively Low | 6th | 1.2 of 5 | 4.2 |
| Hail | Relatively Low | 5th | 1.2 of 5 | 2.0 |
Model hail, wind and flood exposure for Rockingham County in the weather risk calculator
Ratings are the FEMA National Risk Index county hazard ratings; the peril score is a Bywatts transform of the FEMA national percentile. Full data sources and the solar vulnerability methodology are in the weather risk calculator.
Modeled estimate for screening and negotiation. Built from FEMA National Risk Index county hazard data and a solar vulnerability layer documented above. Not a quote, a binder, or actuarial advice, and not a substitute for a carrier's own model. Hazard data: FEMA National Risk Index December 2025, synced 2026-07-24. Resolution is county level, not site level.