SEABROOK

How SEABROOK compares

With 1,242 MW of capacity, SEABROOK is the largest of the 59 operating power plants Bywatts maps in New Hampshire. It accounts for about 27% of all operating capacity in New Hampshire. Nationally it is the 39th-largest of the 55 operating Nuclear plants in the database. Commissioned in 1990, it is newer than 74% of the 58 operating New Hampshire plants with a recorded commissioning year. It shares Rockingham County with 5 other operating plants, including GRANITE RIDGE and EP NEWINGTON ENERGY LLC.

EIA-860 lists 1 generator at the site with 1,242 MW of nameplate capacity, all nuclear technology. Net generation was 9,677 GWh in 2024 (an 89% capacity factor), down 11% from 2022.

Grid neighborhood

The nearest named substation is ELIOT (345 kV), about 18.6 miles away; the closest transmission line found within 10 miles is a 345 kV line owned by PUBLIC SERVICE CO OF NH, under 0.1 miles away. Another 17 operating power plants totaling 1,405 MW sit within 25 miles; the largest is EP NEWINGTON ENERGY LLC (606 MW, Natural Gas). Within 50 miles are 5 mapped data centers; the nearest is ColoCenter.com - Manchester NH in Manchester, about 31.8 miles away.

Computed by Bywatts from HIFLD power plant, substation and transmission line records, EIA-860/923 survey data and PeeringDB data center locations; distances are straight-line. Sources and methodology