Seabrook

Seabrook — 1,242 MW nuclear plant, Rockingham County, NH · Ask the Grid

Generation and physical site

EIA plant 6115 · Inventory for Aug 2026.

Reported operating nameplate by technology

Nuclear: 1,242 MW

Operating generators only. Battery power is in MW; stored energy is in MWh. These ratings do not establish a shared export limit.

Generator records (1)

EIA generator status and nameplate capacity for Seabrook
Generator	Technology	Status	Power (MW)	Energy (MWh)
1	Nuclear	Operating	1,242	Unknown

Physical map location · OpenStreetMap: 42.89791, -70.85632
Filed location · EIA: 42.89917, -70.84889

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Aug 2026
EIA retrieved: Oct 10, 2026
OSM extract: Oct 9, 2026
OSM last mapped edit: Apr 14, 2025
Map prepared: Oct 10, 2026
Field verification: Not reported

Reporting month describes the inventory. Retrieval and map preparation describe processing; an OSM edit does not establish an in-service date.

EIA source inventory

Units and generators

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

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Aug 1990
Aug 1990
Generator enters operationEIA-860
EIA-860 lists generator 1 with this operating date.
Apr 15, 2002
Apr 15, 2002
FPL Group acquisition agreement announcednewsroom.fp...
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.
Mar 12, 2019
Mar 12, 2019
Operating License Renewednrc.gov
NRC issued renewed operating license for Seabrook Station Unit 1. License expires March 15, 2050.

Sources

PublisherReferenceType

U.S. Energy Information AdministrationEIA-860 generator inventoryFederal registry

U.S. Energy Information AdministrationEIA-923 generation filingsFederal filing

mmwec.orgmmwec.orgpublic_source

Common questions about Seabrook

Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.

How big is Seabrook?

Seabrook reports 1,242 MW nuclear of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.

What kind of plant is Seabrook?

Seabrook is a nuclear facility in Rockingham County, NH, participating in the ISO-NE market.

Where is Seabrook located?

Seabrook is in Rockingham County, NH, inside the ISO-NE balancing area.

Who operates Seabrook?

Seabrook is operated by NextEra Energy Seabrook LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Seabrook generate?

Seabrook reported 9,882.1 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.

How does Seabrook compare to other plants?

By capacity, Seabrook ranks #39 of 54 operating plants of the same technology nationally. It ranks #1 of 1 in NH.

Co-located assets

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.

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Overview

Infrastructure record

Seabrook

Overview

Infrastructure record

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Structured profile

Generation and physical site

Reported operating nameplate by technology

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Performance

Peer context

Monthly generation

Grid and market context

Nearby substations

Commercial, land, and environmental record

Transactions and agreements

Related parties and identifiers

Parties and identifiers

Reporting portfolio