NextEra Energy Seabrook LLC - Rockingham County - ISONE
Seabrook Unit 1 is an operating 1,242 MW EIA-nameplate Westinghouse pressurized-water reactor in New Hampshire. NextEra Energy Seabrook operates the plant and owns 88.23%, with three municipal co-owners holding the balance.
Canonical EIA plant baseline.
plant-6115
Answers use this researched asset profile with live ISO-NE data. Ask about ownership, equipment, project history, or current grid context.
Live ISO-NE public data · answers can be wrong, verify against source data or the ISO.
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Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 1,242 MW 1,247 MW summer | Nuclear Nuclear · ST | Aug 1990 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
Project milestones and public references behind the asset profile.
EIA-860 lists generator 1 with this operating date.
FPL Group announced an agreement to purchase an 88.2% interest in Seabrook for $836.6 million, including $749.1 million for plant and decommissioning trust fund, $61.9 million for nuclear fuel, and $25.6 million for Unit 2 components.
NRC issued renewed operating license for Seabrook Station Unit 1. License expires March 15, 2050.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Seabrook has a reported capacity of 1,242 MW. Source: EIA Form 860M.
Seabrook is a nuclear facility in Rockingham County, NH, participating in the ISO-NE market.
Seabrook is in Rockingham County, NH, inside the ISO-NE balancing area.
Seabrook is operated by NextEra Energy Seabrook LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Seabrook reported 10,104.9 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.
By capacity, Seabrook ranks #39 of 54 operating plants of the same technology nationally. It ranks #1 of 1 in NH.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.