Merrimack
Coal power plant · Merrimack County, New Hampshire
Details
- Primary fuel
- Coal
- Technology
- Conventional Steam Coal
- Operator
- Granite Shore Power
- County
- Merrimack County
- Generating units
- 4
- Share of state capacity
- 10.83%
- Rank among coal plants in New Hampshire
- #1 of 1
- EIA plant code
- 2364
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 2 | Conventional Steam Coal | 346 MW | 331 MW | 1968 | Out of service and NOT expected to return to service in next calendar year |
| 1 | Conventional Steam Coal | 114 MW | 108 MW | 1960 | Operating |
| GT1 | Petroleum Liquids | 19 MW | 17 MW | 1968 | Operating |
| GT2 | Petroleum Liquids | 19 MW | 17 MW | 1969 | 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 |
| Newington | Other | 414 MW |
| S C Moore | Hydro | 195 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 496 MW solar plant and a 496 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