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496.4 MW Conventional Steam Coal (459 MW) + Petroleum Liquids (37 MW) operating in Merrimack, NH — ISO New England Inc.
496.4 MW
Nameplate Capacity
4
Generators
units
Hybrid (2)
Technology
Conventional Steam Coal + Petroleum Liquids
1960
Operating Since
Coordinates
43.1411, -71.4692
County
Merrimack, NH
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Granite Shore Power | Granite Shore Power | — |
| Owner(s) | Granite Shore Power | Atlas Holdings | — |
| Status | Operating | — | — |
Merrimack Station, located in Merrimack County, New Hampshire, is a 496.4 MW hybrid power plant primarily fueled by bituminous coal, with petroleum liquids as a secondary fuel. The plant, which began operating in 1960, consists of four generators utilizing conventional steam technology. It is owned by Atlas Holdings and operated by Granite Shore Power. Merrimack Station is within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region.
In the most recent year with available data, Merrimack Station generated 240,580 MWh of electricity, resulting in a capacity factor of 5.5%. The plant holds the ranking of 1 out of 2 for power plants in the state of New Hampshire, and a national ranking of 41 out of 50.
Generated from EIA, GEM, and public data sources
ISO/RTO
ISO-NE
Market
ISO/RTO Member
NERC Region
NPCC — Northeast Power Coordinating Council
Balancing Authority
ISO New England Inc. (ISNE)
Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
0 MWh
Latest Month
240.6K MWh
Annual Generation
5.5%
Capacity Factor
CO₂ Intensity
2300 lb/MWh
NOx
4 lb/MWh
SO₂
1 lb/MWh
CH₄
0.276 lb/MWh
N₂O
0.040 lb/MWh
Capacity Factor
3.7%
Annual Net Gen
162 GWh
CO₂eq
2318 lb/MWh
Subregion
NPCC New England
No financial data available for this plant.
This is a small open-data project — if you have sources or want more coverage here, drop a note.
Market Position
ISO/RTO Market
ISO-NE
LMP Node
4002 Z_NewHampshire
Pricing Hub
.Z.NEWHAMPSHIRE
Node Source
EIA-860 direct report
Last updated 2026-03-26
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