How many nuclear power plants are in Connecticut?

1, with 2 GW of nameplate capacity between them, spread over 1 county. That is the EIA-860M operating count for 2026-07.

Is there a map of Connecticut nuclear power plants?

Yes — the map above. Each dot is one nuclear power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.

Which is the largest nuclear power plant in Connecticut?

Millstone, at 2 GW. The table is sorted largest first, so the rest follow it.

Is there a nuclear power plant near me in Connecticut?

The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.

Which grid operator runs Connecticut's nuclear power plants?

Most of them sit inside ISO New England, according to the balancing-authority code EIA files against each plant. Live conditions for that market are on this site.

How current is this, and what is left out?

EIA-860M for 2026-07. EIA technology "Nuclear" — commercial reactors reporting on EIA-860M. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.

Nuclear Power Plants in Connecticut

Every operating nuclear power plant in Connecticut on EIA-860M for 2026-07: 1 plants, 2 reactors and 2 GW of nameplate capacity across 1 county, most of it inside ISO New England.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Plants: 1; 2 generating units
Nameplate capacity: 2 GW
Counties: 1
Grid operator: ISO New England; covers most of these plants

Map of nuclear power plants in Connecticut

Every one of the 1 plants is drawn at the coordinate EIA files for it.

Loading map…

Nuclear · 1

List of nuclear power plants in Connecticut

Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.

nuclear power plants in Connecticut

MillstoneNuclear	Dominion Energy Nuclear Conn Inc	New London	2,259.9	2	1975	Operating

Largest nuclear power plants in Connecticut

1MillstoneNew London County, Connecticut2,259.9 MW

Nuclear power plants by county in Connecticut

The county EIA files against each plant. It is the fastest way to find the plant nearest a given town.

County	Plants	Nameplate MW
New London	1	2,259.9

Nuclear Power Plants in Connecticut: FAQ

How many nuclear power plants are in Connecticut?: 1, with 2 GW of nameplate capacity between them, spread over 1 county. That is the EIA-860M operating count for 2026-07.
Is there a map of Connecticut nuclear power plants?: Yes — the map above. Each dot is one nuclear power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.
Which is the largest nuclear power plant in Connecticut?: Millstone, at 2 GW. The table is sorted largest first, so the rest follow it.
Is there a nuclear power plant near me in Connecticut?: The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.
Which grid operator runs Connecticut's nuclear power plants?: Most of them sit inside ISO New England, according to the balancing-authority code EIA files against each plant. Live conditions for that market are on this site.
How current is this, and what is left out?: EIA-860M for 2026-07. EIA technology "Nuclear" — commercial reactors reporting on EIA-860M. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.