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 | Mar 2026 |
| Annual Generation | 110.5 TWh |
| Power Plants | 1,577 |
| Utilities | 819 |
| Ranked #15 out of 65 in terms of net annual generation | |
| Ranked #11 out of 54 in terms of annual generation from natural gas | |
| Power Plant Types | Natural Gas | 55.9% Nuclear | 25.1% Water | 4.6% Other Fuel | 4.3% Wind | 4.3% Solar | 1.4% Coal | 0.1% |
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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 |
|---|---|---|---|---|---|---|
| Deer Rips | Brookfield White Pine Hydro LLC | Auburn, ME | 58 GWh | Dec 1902 | Dec 2024 | Water |
| S D Warren Westbrook | Relevate Power Management LLC | Westbrook, ME | 33 GWh | Dec 1902 | Dec 2023 | Water |
| Cabot Holyoke | City of Holyoke Gas and Electric Dept. | Holyoke, MA | 4 GWh | Dec 1892 | Dec 2024 | Water |
| Gravel Pit Solar, LLC | Gravel Pit Solar, LLC | East Windsor, CT | 146 GWh | - | Dec 2025 | Solar |
| Moscow | Greenbacker Renewable Energy Corporation | Moscow, ME | 43 GWh | - | Dec 2025 | Wind |
| Downeast Wind | Downeast Wind, LLC | Columbia, ME | 264 GWh | - | Dec 2025 | Wind |
Surrounding Balancing Authorities
| Rank | Balancing Authority | Annual Net Generation | # Power Plants |
|---|---|---|---|
| #60 | Alcoa Power Generating, Inc. - Yadkin Division | 610.0 GWh | 4 |
| #25 | Dominion Energy South Carolina, Inc. | 25.6 TWh | 87 |
| #13 | Duke Energy Carolinas | 112.4 TWh | 565 |
| #17 | Duke Energy Progress East | 64.5 TWh | 559 |
| #52 | Duke Energy Progress West | 4.3 TWh | 10 |
| #23 | Louisville Gas and Electric Company and Kentucky Utilities Company | 34.3 TWh | 25 |
| #12 | New York Independent System Operator | 134.0 TWh | 1,211 |
| #1 | PJM Interconnection, LLC | 879.0 TWh | 2,465 |
| #29 | South Carolina Public Service Authority | 18.4 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 | 179.9 TWh | 2,075 |
| #9 | Tennessee Valley Authority | 162.4 TWh | 204 |
| #10 | Florida Power & Light Co. | 150.5 TWh | 187 |
| #12 | New York Independent System Operator | 134.0 TWh | 1,211 |
| #13 | Duke Energy Carolinas | 112.4 TWh | 565 |
| #15 | ISO New England | 110.5 TWh | 1,577 |
| #16 | Bonneville Power Administration | 85.9 TWh | 163 |
| #17 | Duke Energy Progress East | 64.5 TWh | 559 |
| #18 | PacifiCorp East | 60.9 TWh | 216 |
| #19 | Salt River Project Agricultural Improvement and Power District | 60.3 TWh | 48 |