ISO New England
Balancing Authority Summary Information
ISO New England is ranked #15 out of 64 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 | Jul 2026 |
| Annual Generation | 111.1 TWh |
| Power Plants | 1,629 |
| Utilities | 833 |
| Ranked #15 out of 64 in terms of net annual generation | |
| Ranked #10 out of 53 in terms of annual generation from natural gas | |
| Power Plant Types | Natural Gas | 54.9% Nuclear | 25% Wind | 5.1% Water | 4.5% Other Fuel | 4.4% Solar | 1.6% 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 |
|---|---|---|---|---|---|---|
| Wareham MA 1 Community Solar | Navisun LLC | Wareham, MA | 3 GWh | Aug 2016 | Dec 2025 | Solar |
| Carver MA 1 Community Solar | Navisun LLC | Carver, MA | 3 GWh | Aug 2016 | Dec 2025 | Solar |
| Freetown MA 1, LLC | Navisun LLC | Freetown, MA | 2 GWh | Nov 2022 | Dec 2025 | Solar |
| OSG Solar 1 LLC | Navisun LLC | Orange, MA | 3 GWh | Jun 2012 | Dec 2025 | Solar |
| Seaboard Sheffield, LLC | Navisun LLC | Sheffield, MA | 2 GWh | Mar 2021 | Dec 2025 | Solar |
| BWC Maces Pond LLC | Navisun LLC | Rockport, ME | 4 GWh | Nov 2021 | Dec 2025 | Solar |
| Seaboard Oxford, LLC | Navisun LLC | Oxford, MA | 3 GWh | Jul 2020 | Dec 2025 | Solar |
| BWC Beech Ridge Brook, LLC | Navisun LLC | Scarborough, ME | 8 GWh | Apr 2023 | Dec 2025 | Solar |
| Oak Leaf Solar XVII Community Solar | Navisun LLC | Pittsfield, MA | 47 MWh | Nov 2025 | Dec 2025 | Solar |
| BWC Rams Horn Channel LLC | Navisun LLC | Beverly, MA | 6 GWh | Nov 2020 | Dec 2025 | Solar |
| Douglas Pike Solar, LLC | Navisun LLC | Burrillville, RI | 3 GWh | May 2023 | Dec 2025 | Solar |
| Acushnet MA 1 | Navisun LLC | Acushnet, MA | 1 GWh | Nov 2023 | Dec 2025 | Solar |
| Acushnet MA 2 (CSG) | Navisun LLC | Acushnet, MA | 1 GWh | Feb 2024 | Dec 2025 | Solar |
| Southwick Solar, LLC Community Solar | Navisun LLC | Southwick, MA | 4 GWh | Apr 2025 | Dec 2025 | Solar |
| Oak Leaf Solar XVI Community Solar | Navisun LLC | Pittsfield, MA | 10 MWh | Nov 2025 | Dec 2025 | Solar |
| BWC Jimmie Pond | Navisun LLC | Hampden, ME | 3 GWh | Nov 2024 | Dec 2025 | Solar |
| Seaboard Charlton, LLC | Navisun LLC | Charlton, MA | 3 GWh | Nov 2020 | Dec 2025 | Solar |
| BWC Unity Pond LLC | Navisun LLC | Benton, ME | 7 GWh | Nov 2023 | Dec 2025 | Solar |
| ISM Solar Shepherd Acres | Navisun LLC | South Paris, ME | 4 GWh | Nov 2024 | Dec 2025 | Solar |
| ISM Solar Cranston CSG | Nautilus Solar Solutions | Cranston, RI | 4 GWh | Nov 2020 | Dec 2025 | Solar |
| Farmingdale FA01 | Nautilus Solar Solutions | Farmingdale, ME | 8 GWh | May 2022 | Dec 2025 | Solar |
| TPE King Solar Holdings1, LLC (CSG) | Nautilus Solar Solutions | North Smithfield, RI | 18 GWh | Mar 2022 | Dec 2025 | Solar |
| Fryeburg | Nautilus Solar Solutions | Fryeburg, ME | 9 GWh | Apr 2023 | Dec 2025 | Solar |
| Mechanic Street (CSG) | Nautilus Solar Solutions | Presque Island, ME | 4 GWh | Nov 2024 | Dec 2025 | Solar |
| Exeter Ten (CSG) | Nautilus Solar Solutions | Exeter, RI | 5 GWh | Nov 2024 | Dec 2025 | Solar |
| Missile Street (CSG) | Nautilus Solar Solutions | Presque Island, ME | 4 GWh | Nov 2024 | Dec 2025 | Solar |
| Brewer (CSG) | Nautilus Solar Solutions | Brewer, ME | 7 GWh | Jul 2024 | Dec 2025 | Solar |
| Dynamic - Leeds Solar (CSG) | Nautilus Solar Solutions | Leeds, ME | 9 GWh | Oct 2024 | Dec 2025 | Solar |
| Dynamic - Norridgewock Martin Stream (CSG) | Nautilus Solar Solutions | Norridgewock, ME | 9 GWh | Oct 2024 | Dec 2025 | Solar |
| Exeter Mail CSG | Nautilus Solar Solutions | Exeter, RI | 9 GWh | Dec 2024 | Dec 2025 | Solar |
| North Bridgton | Nautilus Solar Solutions | Oakland, ME | 8 GWh | Oct 2022 | Dec 2025 | Solar |
| Sanford -NY | Nautilus Solar Solutions | Sanford, ME | 8 GWh | Jan 2024 | Dec 2025 | Solar |
| BNRG Masardis (CSG) | Nautilus Solar Solutions | Masardis, ME | 4 GWh | Nov 2024 | Dec 2025 | Solar |
| BRNG Nicolin (CSG) | Nautilus Solar Solutions | Ellsworth, ME | 6 GWh | Nov 2024 | Dec 2025 | Solar |
| BNRG Norridgewock (CSG) | Nautilus Solar Solutions | Norridgewock, ME | 3 GWh | Oct 2024 | Dec 2025 | Solar |
| BNRG North Anson (CSG) | Nautilus Solar Solutions | North Anson, ME | 3 GWh | Oct 2024 | Dec 2025 | Solar |
| Oakland | Nautilus Solar Solutions | Oakland, ME | 9 GWh | Aug 2022 | Dec 2025 | Solar |
| Pomham Islander (CSG) | Nautilus Solar Solutions | North Smithfield, RI | 1 GWh | Jun 2025 | Dec 2025 | Solar |
| Quarry | Nautilus Solar Solutions | North Berwick, ME | 10 GWh | Nov 2022 | Dec 2025 | Solar |
| Ryans Ranch | Nautilus Solar Solutions | Paris, ME | 5 GWh | May 2022 | Dec 2025 | Solar |
| Wells (ME) | Nautilus Solar Solutions | Wells, ME | 8 GWh | Jun 2022 | Dec 2025 | Solar |
| Washington WS01 | Nautilus Solar Solutions | Washington, ME | 5 GWh | May 2022 | Dec 2025 | Solar |
| Town House | Nautilus Solar Solutions | Chelsea, ME | 8 GWh | Nov 2022 | Dec 2025 | Solar |
| Standish | Nautilus Solar Solutions | Standish, ME | 7 GWh | Sep 2023 | Dec 2025 | Solar |
| Sidney | Nautilus Solar Solutions | Sidney, ME | 2 GWh | Apr 2023 | Dec 2025 | Solar |
| Shaker | Nautilus Solar Solutions | Gray, ME | 6 GWh | Jun 2022 | Dec 2025 | Solar |
| Sanford CGA | Nautilus Solar Solutions | Sanford, ME | 8 GWh | May 2022 | Dec 2025 | Solar |
| Athens AT01 | Nautilus Solar Solutions | Athens, ME | 7 GWh | May 2022 | Dec 2025 | Solar |
| Sabattus SB01 | Nautilus Solar Solutions | Sabattus, ME | 8 GWh | Sep 2023 | Dec 2025 | Solar |
| Hopkins Hill CSG | Nautilus Solar Solutions | West Greenwich, RI | 10 GWh | Oct 2020 | Dec 2025 | Solar |
| Mashpee Landfill Solar | Nautilus Solar Solutions | Mashpee, MA | 2 GWh | Aug 2014 | Dec 2025 | Solar |
| West Brookfield Solar - Gilbertsville Rd | Nautilus Solar Solutions | West Brookfield, MA | 5 GWh | May 2017 | Dec 2025 | Solar |
| Nautilus Goat Island Solar LLC (CSG) | Nautilus Solar Solutions | Burrillville, RI | 4 GWh | Jul 2019 | Dec 2025 | Solar |
| Nationwide | Nationwide Solar Energy LLC | Lancaster, MA | 5 GWh | May 2021 | Dec 2025 | Solar |
| Natick Mall | Natick Mall | Natick, MA | 4 GWh | Dec 2014 | Dec 2024 | Solar |
| NBC Field's Point Wind Farm | Narragansett Bay Commission | Providence, RI | 7 GWh | Sep 2012 | May 2026 | Wind |
| Naples | Naples Casco Solar 1, LLC | Naples, ME | 3 GWh | Nov 2021 | Dec 2025 | Solar |
| Charlestown Wind Turbine | MWRA Charlestown | Charlestown, MA | 1 GWh | Sep 2011 | Dec 2025 | Wind |
| Mt. Tom Solar Project Hybrid | Mt. Tom Solar, LLC | Holyoke, MA | 4 GWh | Dec 2016 | Dec 2025 | Solar |
| Mt Wachusett Community College | Mt Wachusett Community College | Gardner, MA | 4 GWh | Feb 2011 | May 2026 | Wind |
| UMass Boston | MSS Energy Holdings, LLC (d.b.a. Calibrant Energy) | Dorchester, MA | 1 GWh | Dec 1971 | Dec 2025 | Solar |
| Montville Station | Montville Power LLC | Uncasville, CT | 133 GWh | Dec 1953 | Dec 2025 | Residual Fuel Oil : 74.2% Natural Gas : 24.9% Distillate Fuel Oil : 0.9% |
| Montague Road Solar | Montague Road Solar, LLC | Amherst, MA | 4 GWh | Nov 2019 | Dec 2025 | Solar |
| Monson Solar, LLC | Monson Solar, LLC | Monson, MA | 3 GWh | Jul 2017 | Dec 2025 | Solar |
| Rockland Solar CSG | MN8 Energy LLC | Rockland, MA | 2 GWh | Nov 2013 | Dec 2025 | Solar |
| Wilmington Solar | MN8 Energy LLC | Wilmington, MA | 2 GWh | Oct 2015 | Dec 2025 | Solar |
| Westford Solar Park | MN8 Energy LLC | Westford, MA | 4 GWh | Mar 2012 | Dec 2025 | Solar |
| West Bridgewater AB CSG | MN8 Energy LLC | West Bridgewater, MA | 3 GWh | May 2017 | Dec 2025 | Solar |
| Fairhaven C CSG | MN8 Energy LLC | Fairhaven, MA | 2 GWh | Apr 2017 | Dec 2025 | Solar |
| Deerfield CSG Solar | MN8 Energy LLC | Deerfield, MA | 4 GWh | Nov 2017 | Dec 2025 | Solar |
| Barrett PV | MN8 Energy LLC | Oxford, MA | 17 GWh | Oct 2016 | Dec 2025 | Solar |
| Westminster | MN8 Energy LLC | Westminster, VT | 2 GWh | Nov 2016 | Dec 2025 | Solar |
| Grafton PV | MN8 Energy LLC | Grafton, MA | 4 GWh | Sep 2016 | Dec 2025 | Solar |
| Stone Hill Solar CSG | MN8 Energy LLC | North Easton, MA | 2 GWh | Jun 2014 | Dec 2025 | Solar |
| Bridgewater Solar CSG | MN8 Energy LLC | Bridgewater, MA | 4 GWh | Jul 2015 | Dec 2025 | Solar |
| Antares-GRE 314 East Lyme LLC | MN8 Energy LLC | East Lyme, CT | 4 GWh | May 2014 | May 2026 | Solar |
| Fall River Solar CSG | MN8 Energy LLC | Fall River, MA | 2 GWh | Jan 2013 | Dec 2025 | Solar |
| Dry Bridge Solar (Brown University) | MN8 Energy LLC | North Kingstown, RI | 64 GWh | Oct 2023 | May 2026 | Solar |
| Holliston Solar CSG | MN8 Energy LLC | Holliston, MA | 1 GWh | Jun 2015 | Dec 2025 | Solar |
| Dynamic Madison (CSG) | MN8 Energy LLC | Madison, ME | 10 GWh | Jul 2022 | Dec 2025 | Solar |
| Dynamic Corinth (CSG) | MN8 Energy LLC | Corinth, ME | 10 GWh | Sep 2022 | Dec 2025 | Solar |
| Kenmare - Mansfield Branch Street | MN8 Energy LLC | Mansfield, MA | 2 GWh | May 2017 | Dec 2025 | Solar |
| MM Taunton Energy | MM Taunton Energy LLC | Taunton, MA | 7 GWh | Aug 1997 | Dec 2025 | Landfill Gas |
| Milo CSG | Milo CSG, LLC | Milo, ME | 7 GWh | Jan 2022 | Dec 2025 | Solar |
| Millis MA 1 | Millis MA 1 LLC | Millis, MA | 2 GWh | Oct 2018 | Dec 2025 | Solar |
| Millennium Power | Millennium Power Company, LLC | Charlton, MA | 995 GWh | Mar 2001 | May 2026 | Natural Gas |
| Millbury MA #1092 | Millbury MA #1092 LLC | Millbury, MA | 2 GWh | May 2019 | Dec 2025 | Solar |
| Milford Power LP | Milford Power LLC | Milford, MA | 253 GWh | Feb 1993 | Dec 2025 | Natural Gas |
| Milford Power Project | Milford Power Co LLC | Milford, CT | 3 TWh | Jan 2004 | May 2026 | Natural Gas |
| Dynamic Energy CT STAG | Milford Pepes Farm Road Solar LLC | Milford, CT | 2 GWh | Jul 2023 | Dec 2024 | Solar |
| Middletown | Middletown Power LLC | Middletown, CT | 33 GWh | Sep 1958 | Dec 2024 | Residual Fuel Oil : 60.6% Natural Gas : 39.3% |
| Middlebury College | Middlebury College Biomass | Middlebury, VT | 2 GWh | Dec 1979 | May 2026 | Wood/Wood Waste Solids : 60.7% Natural Gas : 39.3% |
| MEVS Waterhouse | MEVS LLC | Scarborogh, ME | 3 GWh | Nov 2024 | Dec 2025 | Solar |
| MEVS DOT 109 | MEVS DOT, LLC | Augusta, ME | 4 GWh | Jun 2023 | Dec 2025 | Solar |
| MEVS Clark LLC | MEVS Clark LLC | Bingham, ME | 6 GWh | Sep 2023 | Dec 2025 | Solar |
| Goodwin Hydroelectric | Metropolitan Dist of Hartford | W. Hartland, CT | 8 GWh | Mar 1986 | Oct 2025 | Water |
| Messalonskee 5 | Messalonskee Stream Hydro LLC | Waterville, ME | 4 GWh | Dec 1934 | Dec 2025 | Water |
| Messalonskee 3 | Messalonskee Stream Hydro LLC | Oakland, ME | 4 GWh | Dec 1917 | Dec 2025 | Water |
| Messalonskee 2 (Oakland) | Messalonskee Stream Hydro LLC | Oakland, ME | 7 GWh | Dec 1923 | Dec 2025 | Water |
| Merrimack Solar Farm, LLC | Merrimack Solar Farm | Merrimack, NH | 3 GWh | Dec 2018 | Dec 2025 | Solar |
Surrounding Balancing Authorities
| Rank | Balancing Authority | Annual Net Generation | # Power Plants |
|---|---|---|---|
| #61 | Alcoa Power Generating, Inc. - Yadkin Division | 442.5 GWh | 4 |
| #24 | Dominion Energy South Carolina, Inc. | 25.3 TWh | 83 |
| #13 | Duke Energy Carolinas | 112.6 TWh | 577 |
| #17 | Duke Energy Progress East | 64.5 TWh | 565 |
| #50 | Duke Energy Progress West | 4.5 TWh | 15 |
| #23 | Louisville Gas and Electric Company and Kentucky Utilities Company | 33.9 TWh | 25 |
| #12 | New York Independent System Operator | 134.3 TWh | 1,299 |
| #1 | PJM Interconnection, LLC | 882.8 TWh | 2,652 |
| #31 | South Carolina Public Service Authority | 18.5 TWh | 35 |
| #59 | Southeastern Power Administration | 1.3 TWh | 11 |
Balancing Authorities with Similar Net Generation
| Rank | Balancing Authority | Annual Net Generation | # Power Plants |
|---|---|---|---|
| #7 | California Independent System Operator | 169.4 TWh | 2,135 |
| #9 | Tennessee Valley Authority | 163.4 TWh | 207 |
| #10 | Florida Power & Light Co. | 152.2 TWh | 187 |
| #12 | New York Independent System Operator | 134.3 TWh | 1,299 |
| #13 | Duke Energy Carolinas | 112.6 TWh | 577 |
| #15 | ISO New England | 111.1 TWh | 1,629 |
| #16 | Bonneville Power Administration | 91.6 TWh | 167 |
| #17 | Duke Energy Progress East | 64.5 TWh | 565 |
| #18 | PacifiCorp East | 60.9 TWh | 222 |
| #19 | Salt River Project Agricultural Improvement and Power District | 60.3 TWh | 49 |