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790 MW Natural Gas operating in Rockingham, NH — ISO New England Inc.
790 MW
Nameplate Capacity
3
Generators
units
Natural Gas Fired Combined Cycle
Technology
2003
Operating Since
Coordinates
42.9042, -71.4261
County
Rockingham, NH
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Granite Ridge Energy LLC | Granite Ridge Energy | — |
| Owner(s) | Granite Ridge Energy LLC | Constellation Energy | — |
| Status | Operating | — | — |
Granite Ridge is a 790 MW natural gas-fired combined cycle power plant located in Rockingham County, New Hampshire. The plant began operating in 2003 and consists of 3 generators. It is owned by Constellation Energy and operated by Granite Ridge Energy LLC. Granite Ridge is the largest of 3 power plants in New Hampshire, and ranks 258th out of 945 plants nationally.
The plant operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. In the latest year of reported data, Granite Ridge generated 3,398,436 MWh of electricity, achieving a capacity factor of 48.9%.
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
390.4K MWh
Latest Month
3.4M MWh
Annual Generation
48.9%
Capacity Factor
CO₂ Intensity
856 lb/MWh
NOx
0.068 lb/MWh
SO₂
2013
$965/kW
Est. Construction Cost
Total estimated cost: $762.4M
Point of Interconnection
Nearest Substation
Granite Ridge Substation · 230 kV
Substation Distance
< 10 km
Operator
National Grid
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
48120/48121
Pricing Hub
.Z.NEWHAMPSHIRE
Node Source
EIA-860 direct report
Last updated 2026-04-09
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Grid Voltage
230.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
0.004 lb/MWh
CH₄
0.017 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
48.3%
Annual Net Gen
3345 GWh
CO₂eq
857 lb/MWh
Subregion
NPCC New England