Seabrook — Plant Summary
- EIA Plant ID
- 6115
- Capacity
- 1242 MW
- Primary Fuel
- Nuclear
- Technology
- Nuclear
- Status
- Operating
- Location
- Rockingham, NH
- Operating Since
- 1990
- Generators
- 1
- Operator
- NextEra Energy Seabrook LLC
- Parent Company
- —
- Annual Generation
- 10,910,165 MWh
- Capacity Factor
- 99.9%
- Balancing Authority
- ISO New England Inc.
- ISO/RTO
- ISONE
- NERC Region
- NPCC
Seabrook
OperatingNuclearGEM: cancelled
Ranked #1 of 1 Nuclear plants in NH#40 of 57 nationally
1242 MW Nuclear operating in Rockingham, NH — ISO New England Inc.
EIAGEMWD
1,242 MW
Nameplate Capacity
1
Generators
unit
Nuclear
Technology
1990
Operating Since
Location
Coordinates
42.8981, -70.8562
County
Rockingham, NH
Nearby Plants
- Hampton FacilityNatural Gas5 MW · 4.6 km
- True NorthSolar4.8 MW · 6.4 km
- Kearsarge Amesbury HybridBESS4.9 MW · 9.5 km
Ownership & Operator
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | NextEra Energy Seabrook LLC | Public Service CO of New Hampshire [100%] | NextEra Energy Resources |
| Owner(s) | City of Taunton, Massachusetts Mun Wholes Electric Co, NextEra Energy Seabrook LLC, Town of Hudson - (MA) | Public Service CO of New Hampshire [100%] | — |
| Status | Operating | cancelled | — |
Ownership Chain
GEM identifies the owner as Public Service CO of New Hampshire [100%]
This entity is not yet in the GEM ownership database — chain unavailable.
About
The Seabrook Nuclear Power Plant, more commonly known as Seabrook Station, is a nuclear power plant located in Seabrook, New Hampshire, United States, approximately 40 miles (64 km) north of Boston and 10 miles (16 km) south of Portsmouth. It has operated since 1990. With its 1,244-megawatt electrical output, Seabrook Unit 1 is the largest individual electrical generating unit on the New England power grid. It is the second largest nuclear plant in New England after the two-unit Millstone Nuclear Power Plant in Connecticut.
Read more on WikipediaSeabrook Station is a 1242 MW nuclear power plant located in Rockingham County, New Hampshire. It began operating in 1990 and is owned and operated by NextEra Energy Seabrook LLC. The plant is the largest in New Hampshire and ranks 38th out of 55 nuclear plants nationally. It has a single nuclear reactor.
In the most recent year with available data, Seabrook generated 10,910,165 MWh of electricity, operating at a 99.9% capacity factor. The plant is located within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
345 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
927.2K MWh
Latest Month
10.9M MWh
Annual Generation
99.9%
Capacity Factor
Jan 2023 – Dec 2025
Financial Data
No financial data available for this plant.
Pricing & Market Data
HIGH confidencePoint of Interconnection
Nearest Substation
Seabrook Transition Station · 345 kV
Substation Distance
0.156 km
Operator
NextEra Energy
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
UN.SEABROOK24.5SBRK
Pricing Hub
.Z.NEWHAMPSHIRE
Node Source
Curated node match
News & Articles (10)Beta
Regulatory·state puc
Gov. Kelly Ayotte advocates for expanded nuclear energy generation in New Hampshire
Ayotte said she aimed to put New Hampshire at the “forefront” of nuclear energy technology in her State of the State address.
Kelly Ayotte (other)New Hampshire (other)
The Dartmouth·4 days ago
Regulatory·state puc
Ayotte wants to bring more nuclear power to New Hampshire. How would that work?
Nuclear power faced major opposition in New Hampshire in the 1970s. Half a century later, Ayotte wants to make the state the face of nuclear...
Ayotte (other)New Hampshire (other)
New Hampshire Public Radio·4 weeks ago
Grid·interconnection
What the New Hydropower Transmission Line in Maine Could Mean for NH’s Energy Future
Transmission lines that carry power to electric customers. (Annie Ropeik/NHPR). A hydropower line bringing electricity from Canada into the...
Business NH Magazine·4 weeks ago
Industry·corporate
Nuke-Power-Rich NH to Study Exit from Regional Power Grid
Is Solar and Wind Power Costing NH Ratepayers? Legislators Want to Know. Above, the Seabrook Nuclear Power Station.
Seabrook Nuclear Power Station (operator)
Franklin Observer·4 weeks ago
Last updated 2026-03-14
View all 10 articles