MERRIMACK

How MERRIMACK compares

With 496 MW of capacity, MERRIMACK ranks 4th among the 59 operating power plants Bywatts maps in New Hampshire and is the largest of the 2 operating Coal plants in the state. It accounts for about 74% of New Hampshire's operating Coal capacity and 11% of all operating capacity in the state. Nationally it is the 164th-largest of the 324 operating Coal plants in the database. Commissioned in 1960, it is older than 74% of the 58 operating New Hampshire plants with a recorded commissioning year. Its operator, PUBLIC SERVICE CO OF NH, runs 13 operating plants in New Hampshire totaling 1,183 MW. It shares Merrimack County with 11 other operating plants, including WHEELABRATOR CONCORD FACILITY and GARVINS FALLS.

EIA-860 lists 4 generators at the site with 496 MW of nameplate capacity, mainly conventional steam coal technology. Net generation was 226 GWh in 2024 (a 5.2% capacity factor), down 27% from 2022. Its generators came online between 1960 and 1969.

Grid neighborhood

The closest transmission line found within 10 miles is a 115 kV line owned by PUBLIC SERVICE CO OF NH, under 0.1 miles away. Another 19 operating power plants totaling 983 MW sit within 25 miles; the largest is GRANITE RIDGE (900 MW, Natural Gas). Within 50 miles is one mapped data center, ColoCenter.com - Manchester NH in Manchester, about 11.7 miles away.

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