Granite Ridge — Plant Summary
- EIA Plant ID
- 55170
- Capacity
- 790 MW
- Primary Fuel
- Natural Gas
- Technology
- Natural Gas Fired Combined Cycle
- Status
- Operating
- Location
- Rockingham, NH
- Operating Since
- 2003
- Generators
- 3
- Operator
- Granite Ridge Energy LLC
- Parent Company
- Constellation Energy
- Annual Generation
- 3,398,436 MWh
- Capacity Factor
- 48.9%
- Balancing Authority
- ISO New England Inc.
- ISO/RTO
- ISONE
- NERC Region
- NPCC
Granite Ridge
OperatingNatural Gas
Ranked #1 of 4 Natural Gas plants in NH#254 of 2009 nationally
790 MW Natural Gas operating in Rockingham, NH — ISO New England Inc.
EIAWD
790 MW
Nameplate Capacity
3
Generators
units
Natural Gas Fired Combined Cycle
Technology
2003
Operating Since
Location
Coordinates
42.9042, -71.4261
County
Rockingham, NH
Nearby Plants
- AmoskeagHydro16 MW · 11.5 km
- Waihonu South SolarSolar1.5 MW · 11.7 km
- North Haven Solar OneSolar1.6 MW · 11.9 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Granite Ridge Energy LLC | Granite Ridge Energy | — |
| Owner(s) | Granite Ridge Energy LLC | Constellation Energy | — |
| Status | Operating | — | — |
Ownership Chain
About
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
Engineering & Generators
Grid Context
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
390.4K MWh
Latest Month
3.4M MWh
Annual Generation
48.9%
Capacity Factor
Jan 2023 – Dec 2025
Financial Data
No financial data available for this plant.
Pricing & Market Data
HIGH confidencePoint 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
News & Articles (10)Beta
Deals·m and a
Constellation to Sell 4.4 GW of PJM Gas Power Assets to LS Power for $5B in Regulatory Divestiture
Competitive generation giant Constellation Energy has agreed to sell approximately 4.4 GW of natural gas–fired generation capacity in PJM Interconnection to LS Power Equity Advisors for $5 billion, marking the largest single tranche of divestitures required to resolve antitrust and market-power c...
Constellation Energy (seller)LS Power (buyer)
POWER Magazine·1 weeks ago
Deals·m and a
Constellation to sell 4.4GW of PJM assets to LS Power for $5B as part of Calpine acquisition
Constellation Energy Corporation will sell a portfolio of generation assets in PJM to LS Power for $5 billion, fulfilling DOJ requirements from its Calpine acquisition.
Constellation Energy Corporation (seller)LS Power (buyer)
Power Engineering·1 weeks ago
Industry·technology
Review: Ryzen 5 9600X processor
The AMD Ryzen 5 9600X is a mid-range desktop CPU within the Granite Ridge product family, featuring 6 Zen 5 cores (12 threads) operating at a base frequency of...
Granite Ridge (other)AMD (other)
www.guru3d.com·1 years ago
Hazards·wildfire
Fire crews contain fire in natural gas turbine at Londonderry power plant
LONDONDERRY — Crews from multiple communities worked for hours to get an interior fire under control at the Calpine Granite Ridge power...
Calpine Granite Ridge (operator)
UnionLeader.com·7 years ago
Last updated 2026-03-21
View all 10 articles