Power plant · Connecticut, United States
Millstone
Millstone is a power plant in Connecticut, United States, with 2,260 MW of capacity, owned by Dominion Energy Nuclear Conn Inc (96.1%), Massachusetts Mun Wholes Electric Co (2.9%) and Green Mountain Power Corp (1%).
Facts
Every value links to its source, and to the source's own record where it has one. Licences and last-checked dates are per row.
| Fact | Value | Source |
|---|---|---|
| Location | Connecticut | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Status | Operating | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Start year | 1975 | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Owner | Dominion Energy Nuclear Conn Inc (96.1%) | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Owner | Massachusetts Mun Wholes Electric Co (2.9%) | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Owner | Green Mountain Power Corp (1%) | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Operator | Dominion Energy Nuclear Conn Inc | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Capacity | 2,260 MW | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Technology | Nuclear | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
| Coordinates | 41.3107, -72.1677 | EIA-860 / 860M / 923 · Public domain · checked 24 Oct 2026 |
Research on this power plant and its owner.Who owns it up to the parent company, its grid connection and planning status, and an introduction to the owner.
Request researchHow it compares
Millstone is the largest of 9 power plants in Connecticut and the 54th-largest of 800 in the United States by capacity; its 2,260 MW is 0.27% of the 839,036 MW we hold for the United States. Ranks and totals cover the power plants in our data that report their capacity, not every one in existence. Power plants planned, permitted or under construction are ranked apart.
| Within | Rank | Total | Share |
|---|---|---|---|
| Connecticut | 1st of 9 | 7,446 MW | 30% |
| United States | 54th of 800 | 839,036 MW | 0.27% |
| All power plants in our data | 55th of 12,008 | 1,173,302 MW | 0.19% |
Owners, operator and place
- Dominion Energy Nuclear Conn IncOwner · 96.1%
- Massachusetts Mun Wholes Electric CoOwner · 2.9%
- Green Mountain Power CorpOwner · 1%
- Dominion Energy Nuclear Conn IncOperator
- Power plants in Connecticut, United States11
- Power plants in the United States1,635
- The United States: country profile
- Largest power plants
Other power plants in Connecticut
- CPV Towantic Energy Center842 MW
- Lake Road Generating Plant840 MW
- Kleen Energy Systems693 MW
- New Haven Steam642 MW
- Milford Power Project578 MW
- Bridgeport Station576 MW
- Bridgeport Energy Project520 MW
- Montville Station495 MW
Data on this page
- DESNZ Renewable Energy Planning Database (REPD). DESNZ Renewable Energy Planning Database (REPD), Open Government Licence v3.0.
- Source: U.S. Energy Information Administration (Sep 2026). EIA-860 / 860M / 923, Public domain.
- Bundesnetzagentur, Marktstammdatenregister. Marktstammdatenregister, DL-DE-BY-2.0.
- Planning Inspectorate: National Infrastructure Projects. Planning Inspectorate: National Infrastructure Projects, Open Government Licence v3.0.
- RVO SDE(+)(+) projecten in beheer and SDE viewer. RVO SDE(+)(+) projecten in beheer and SDE viewer, Free reuse, no attribution required.