ISO New England
Balancing Authority Summary Information
ISO New England is ranked #15 out of 65 balancing authorities in terms of total annual electricity generation.
| Balancing Authority | ISO New England |
|---|---|
| States | Connecticut Maine Massachusetts New Hampshire New York Rhode Island Vermont |
| Last Update | Dec 2025 |
| Annual Generation | 106.2 TWh |
| Power Plants | 1,577 |
| Utilities | 819 |
| Ranked #15 out of 65 in terms of net annual generation | |
| Ranked #12 out of 53 in terms of annual generation from natural gas | |
| Power Plant Types | Natural Gas | 55.8% Nuclear | 25.8% Water | 4.9% Other Fuel | 4.4% Wind | 4.1% Solar | 1.5% Coal | 0.3% |
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Daily Net Generation for ISO New England for the past 3 Years
| Plant Name | Utility | Location | Annual Generation | Plant Date | Last Update | Fuel Types |
|---|---|---|---|---|---|---|
| Bridgeport Station | Generation Bridge II Connecticut, LLC | Bridgeport, CT | 4 TWh | Jul 1961 | Sep 2025 | Natural Gas : 98.6% Distillate Fuel Oil : 1.4% |
| Milford Power Project | Milford Power Co LLC | Milford, CT | 4 TWh | Jan 2004 | Sep 2025 | Natural Gas |
| CPV Towantic Energy Center | CPV Towantic, LLC | Oxford, CT | 5 TWh | Apr 2018 | Sep 2025 | Natural Gas |
| Lake Road Generating Plant | Lake Road Generating Co LP | Dayville, CT | 6 TWh | Feb 2002 | Sep 2025 | Natural Gas |
| Seabrook | NextEra Energy Seabrook LLC | Seabrook, NH | 10 TWh | Jul 1990 | Sep 2025 | Nuclear |
| Millstone | Dominion Energy Nuclear Conn Inc | Waterford, CT | 16 TWh | Nov 1975 | Sep 2025 | Nuclear |
Surrounding Balancing Authorities
| Rank | Balancing Authority | Annual Net Generation | # Power Plants |
|---|---|---|---|
| #60 | Alcoa Power Generating, Inc. - Yadkin Division | 687.9 GWh | 4 |
| #25 | Dominion Energy South Carolina, Inc. | 25.0 TWh | 87 |
| #13 | Duke Energy Carolinas | 112.3 TWh | 565 |
| #17 | Duke Energy Progress East | 64.6 TWh | 559 |
| #52 | Duke Energy Progress West | 4.3 TWh | 10 |
| #24 | Louisville Gas and Electric Company and Kentucky Utilities Company | 34.5 TWh | 25 |
| #12 | New York Independent System Operator | 132.0 TWh | 1,211 |
| #1 | PJM Interconnection, LLC | 872.9 TWh | 2,465 |
| #30 | South Carolina Public Service Authority | 18.8 TWh | 34 |
| #59 | Southeastern Power Administration | 1.4 TWh | 11 |
Balancing Authorities with Similar Net Generation
| Rank | Balancing Authority | Annual Net Generation | # Power Plants |
|---|---|---|---|
| #7 | California Independent System Operator | 187.8 TWh | 2,075 |
| #9 | Tennessee Valley Authority | 161.9 TWh | 204 |
| #10 | Florida Power & Light Co. | 149.3 TWh | 187 |
| #12 | New York Independent System Operator | 132.0 TWh | 1,211 |
| #13 | Duke Energy Carolinas | 112.3 TWh | 565 |
| #15 | ISO New England | 106.2 TWh | 1,577 |
| #16 | Bonneville Power Administration | 80.9 TWh | 163 |
| #17 | Duke Energy Progress East | 64.6 TWh | 559 |
| #18 | PacifiCorp East | 61.1 TWh | 216 |
| #19 | Salt River Project Agricultural Improvement and Power District | 59.9 TWh | 48 |