Power plants in the ISO New England balancing area
The ISO New England balancing area takes in 1,475 power plants with 38.2 GW of nameplate capacity, the tenth-largest of the 40 areas covered here. Its plants sit in seven states, with Massachusetts holding 34% of the capacity. Natural gas makes up 44% of the mix, and the largest plant is Millstone (2,260 MW). Since 2020, 3,536 MW has come online here, 67% of it solar.
- Natural gas16,921 MW44%
- Oil and petroleum5,970 MW16%
- Solar3,726 MW9.7%
- Nuclear3,502 MW9.2%
- Hydroelectric1,926 MW5.0%
- Pumped-storage hydro1,865 MW4.9%
- Wind1,723 MW4.5%
- Biomass and waste1,363 MW3.6%
- Battery storage772 MW2.0%
- Coal459 MW1.2%
Capacity by decade it came online
NuclearCoalNatural gasOil and petroleumHydroelectricPumped-storage hydroWindSolarBattery storageBiomass and waste
Above the line: capacity operating in 2025. Below: capacity retired at plants that still run.
The 25 largest plants in the area
| Rank | Plant | State | Runs on | Capacity | First unit |
|---|---|---|---|---|---|
| 1 | Millstone | Connecticut | Nuclear | 2,260 MW | 1975 |
| 2 | Canal | Massachusetts | Oil and petroleum | 1,495 MW | 1968 |
| 3 | Seabrook | New Hampshire | Nuclear | 1,242 MW | 1990 |
| 4 | Northfield Mountain | Massachusetts | Pumped-storage hydro | 1,168 MW | 1972 |
| 5 | Fore River Generating Station | Massachusetts | Natural gas | 872 MW | 2003 |
| 6 | William F Wyman Hybrid | Maine | Oil and petroleum | 863 MW | 1957 |
| 7 | CPV Towantic Energy Center | Connecticut | Natural gas | 842 MW | 2018 |
| 8 | Lake Road Generating Plant | Connecticut | Natural gas | 840 MW | 2002 |
| 9 | Salem Harbor Power Development LP | Massachusetts | Natural gas | 798 MW | 2018 |
| 10 | Granite Ridge | New Hampshire | Natural gas | 790 MW | 2003 |
| 11 | Middletown | Connecticut | Oil and petroleum | 786 MW | 1958 |
| 12 | Kleen Energy Systems | Connecticut | Natural gas | 693 MW | 2011 |
| 13 | Bear Swamp | Massachusetts | Pumped-storage hydro | 666 MW | 1974 |
| 14 | New Haven Steam | Connecticut | Oil and petroleum | 642 MW | 1975 |
| 15 | Newington Energy Center | New Hampshire | Natural gas | 606 MW | 2002 |
| 16 | Rhode Island State Energy Center | Rhode Island | Natural gas | 596 MW | 2002 |
| 17 | ANP Bellingham Energy Project | Massachusetts | Natural gas | 578 MW | 2002 |
| 18 | ANP Blackstone Energy Project | Massachusetts | Natural gas | 578 MW | 2001 |
| 19 | Milford Power Project | Connecticut | Natural gas | 578 MW | 2004 |
| 20 | Bridgeport Station | Connecticut | Natural gas | 576 MW | 2019 |
| 21 | Westbrook Energy Center Power Plant | Maine | Natural gas | 564 MW | 2001 |
| 22 | Maine Independence Station | Maine | Natural gas | 550 MW | 2000 |
| 23 | Stony Brook | Massachusetts | Oil and petroleum | 542 MW | 1981 |
| 24 | Bridgeport Energy Project | Connecticut | Natural gas | 520 MW | 1998 |
| 25 | Manchester Street | Rhode Island | Natural gas | 515 MW | 1995 |
States
| State | Plants | Capacity |
|---|---|---|
| Massachusetts | 684 | 13.0 GW |
| Connecticut | 182 | 11.0 GW |
| Maine | 264 | 6,006 MW |
| New Hampshire | 61 | 4,582 MW |
| Rhode Island | 111 | 2,570 MW |
| Vermont | 117 | 899 MW |
| New York | 56 | 191 MW |
Operators with the most capacity
| Operator | Plants | Capacity |
|---|---|---|
| Dominion Energy Nuclear Conn Inc | 1 | 2,260 MW |
| Canal Generating LLC | 1 | 1,495 MW |
| NextEra Energy Seabrook LLC | 1 | 1,242 MW |
| FirstLight Power Resources, Inc. - MA | 4 | 1,237 MW |
| Generation Bridge II Connecticut, LLC | 2 | 1,218 MW |
| Granite Shore Power | 5 | 968 MW |
| Calpine Fore River Energy Center, LLC | 1 | 872 MW |
| FPL Energy Wyman LLC | 1 | 863 MW |
| CPV Towantic, LLC | 1 | 842 MW |
| Lake Road Generating Co LP | 1 | 840 MW |