United States · 41.311, -72.168Millstone
Millstone, nuclear power plant in United States, operates 2 pressurized water reactors with 2,079 MW net installed capacity and has been in service since 1971.
Unit Millstone 2 has been operating for 51 years, since 1975. Its 2,079 MW net are enough to supply about 6,550,000 households.
- Country
- United States
- Units
- 3
- Technology
- BWR · PWR
- Net capacity
- 2,079 MWe
- First grid connection
- 1971
- Operator
- Dominion Energy
- Owner
- Dominion Resources Inc
- Status
- Operating
See also: alerts for this plant · every plant in United States · Nuclear power plants in Connecticut · Vendor: General Electric · Vendor: Combustion Engineering · Vendor: Westinghouse · every BWR reactor · how a BWR works · every PWR reactor · how a PWR works
Units
| Unit | Type | Model | Status | MWe | MWt | Construction start | Grid connection | Closure | Licence until | Load factor |
|---|---|---|---|---|---|---|---|---|---|---|
| Millstone 1 | Boiling water (BWR) | BWR-3 (WET) | Shut down | 641 | 2,011 | May 1, 1966 | Nov 1970 | Jul 1998 | — | — |
| Millstone 2 | Pressurized water (PWR) | Combustion Engineering 2-loop (CE 2LP) | Operating | 869 | 2,700 | Nov 1, 1969 | Nov 9, 1975 | — | Jul 31, 2035 | 89.1 % (2024) |
| Millstone 3 | Pressurized water (PWR) | Westinghouse 4-loop (WH 4LP) | Operating | 1,210 | 3,650 | Aug 9, 1974 | Feb 12, 1986 | — | Nov 25, 2045 | 95.1 % (2024) |
Data: IAEA PRIS · Wikipedia · updated on Sep 17, 2026
Millstone 1, a 641 MWe BWR (BWR-3 (WET)), started construction in 1966 and operated from 1970 to 1998.
Millstone 2, an 869 MWe PWR (Combustion Engineering 2-loop (CE 2LP)), started construction in 1969, was connected to the grid in 1975 and is still operating, with a 89.1% load factor in 2024.
Millstone 3, a 1,210 MWe PWR (Westinghouse 4-loop (WH 4LP)), started construction in 1974, was connected to the grid in 1986 and is still operating, with a 95.1% load factor in 2024.
Operator: Dominion Energy.
Owner: Dominion Resources Inc (Millstone 2, Millstone 3).