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 | Nov 2025 |
| Annual Generation | 105.5 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 | 26% Water | 5% Other Fuel | 4.4% Wind | 4% Solar | 1.5% Coal | 0.4% |
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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 |
|---|---|---|---|---|---|---|
| 433 Purchase Solar NG, LLC | NuGen Capital Management | Swansea, MA | 4 GWh | Mar 2012 | Dec 2024 | Solar |
| Old Wardour Solar | NuGen Capital Management | East Brookfield, MA | 7 GWh | Dec 2015 | Dec 2024 | Solar |
| Shuman Solar | NuGen Capital Management | Stoughton, MA | 2 GWh | Mar 2016 | Dec 2024 | Solar |
| 265 Pleasant Solar NG, LLC | NuGen Capital Management | Lunenburg, MA | 1 GWh | Jun 2014 | Dec 2024 | Solar |
| East Acres Solar NG, LLC | NuGen Capital Management | Pittsfield, MA | 5 GWh | Mar 2017 | Dec 2024 | Solar |
| Hadley Solar NG, LLC | NuGen Capital Management | Hadley, MA | 3 GWh | Jun 2014 | Dec 2024 | Solar |
| Vuelta Solar | NuGen Capital Management | East Brookfield, MA | 7 GWh | Dec 2015 | Dec 2024 | Solar |
| 10 Briggs Solar NG, LLC (East) | NuGen Capital Management | East Greenwich, RI | 7 GWh | May 2021 | Dec 2024 | Solar |
| Bristol Landfill Solar | NuGen Capital Management | Bristol, RI | 8 GWh | Feb 2024 | Dec 2024 | Solar |
| 580 River Solar | NuGen Capital Management | Winchendon, MA | 5 GWh | Aug 2018 | Dec 2024 | Solar |
| Halifax Solar | NuGen Capital Management | Halifax, MA | 4 GWh | Jul 2015 | Dec 2024 | Solar |
| Southwick Solar PV | NSTAR Electric Company | Southwick, MA | 8 GWh | Dec 2018 | Sep 2025 | Solar |
| Wareham Solar PV | NSTAR Electric Company | Wareham, MA | 1 GWh | Nov 2018 | Dec 2024 | Solar |
| East Longmeadow Solar PV | NSTAR Electric Company | East Longmeadow, MA | 5 GWh | Sep 2019 | Dec 2024 | Solar |
| Greenfield Solar PV | NSTAR Electric Company | Greenfield, MA | 3 GWh | Dec 2018 | Dec 2024 | Solar |
| Hinsdale Solar PV | NSTAR Electric Company | Hinsdale, MA | 3 GWh | Dec 2018 | Dec 2024 | Solar |
| Southampton Solar PV | NSTAR Electric Company | Southampton, MA | 3 GWh | Jan 2019 | Dec 2024 | Solar |
| Savoy Solar PV | NSTAR Electric Company | Savoy, MA | 3 GWh | Jan 2019 | Dec 2024 | Solar |
| Plymouth Solar | NSTAR Electric Company | Plymouth, MA | 1 GWh | May 2018 | Dec 2024 | Solar |
| Lee Site 31 Solar | NSTAR Electric Company | Lee, MA | 2 GWh | Jul 2018 | Apr 2024 | Solar |
| Pittsfield 44 - M&W PV | NSTAR Electric Company | Pittsfield, MA | 2 GWh | Jul 2018 | Dec 2024 | Solar |
| Ludlow Site 72 - Conti | NSTAR Electric Company | Ludlow, MA | 2 GWh | Jul 2018 | Dec 2024 | Solar |
| East Springfield Solar PV | NSTAR Electric Company | Springfield, MA | 2 GWh | Sep 2018 | Dec 2024 | Solar |
| Montague Site 36-Grosolar | NSTAR Electric Company | Millers Falls, MA | 6 GWh | Sep 2018 | Sep 2025 | Solar |
| Sunderland Solar PV | NSTAR Electric Company | Sunderland, MA | 2 GWh | Aug 2018 | Dec 2024 | Solar |
| Hampden Solar PV | NSTAR Electric Company | Hampden, MA | 6 GWh | Oct 2019 | Dec 2024 | Solar |
| Springfield Solar PV | NSTAR Electric Company | Springfield, MA | 6 GWh | Dec 2018 | Dec 2024 | Solar |
| Hatfield Solar PV | NSTAR Electric Company | Hatfield, MA | 6 GWh | Nov 2018 | Dec 2024 | Solar |
| Renew Canal 1 CSG LLC | NRG Renew Canal 1 LLC | Sandwich, MA | 2 GWh | May 2017 | Dec 2024 | Solar |
| Notus Wind 1 | Notus Clean Energy LLC | E. Falmouth, MA | 4 GWh | Jun 2010 | Dec 2024 | Wind |
| Norton Powerhouse 2 | Norton Powerhouse 2 | Worcester, MA | 29 GWh | Oct 2022 | Dec 2024 | Natural Gas |
| Bellingham Cogeneration Facility | Northeast Energy Associates LP | Bellingham, MA | 368 GWh | Aug 1991 | Dec 2024 | Natural Gas : 99.9% |
| North Kingstown Solar LLC | North Kingstown Solar LLC | North Kingstown, RI | 3 GWh | Aug 2022 | Dec 2024 | Solar |
| North Haven Solar One | North Haven Solar One, LLC | North Haven, CT | 3 GWh | Feb 2024 | Dec 2024 | Solar |
| River Road | Norridgewock River Road Solar, LLC | Norridgewock, ME | 8 GWh | Feb 2022 | Dec 2024 | Solar |
| Howard Lane Solar | NJR Clean Energy Ventures Corporation | Glocester, RI | 4 GWh | Aug 2023 | Nov 2024 | Solar |
| CP East Hampton I & II Solar | NJR Clean Energy Ventures Corporation | East Hampton, CT | 3 GWh | Jan 2021 | Dec 2024 | Solar |
| Raffia Road Solar Project | NJR Clean Energy Ventures Corporation | Enfield, CT | 11 MWh | Nov 2024 | Dec 2024 | Solar |
| Norfolk Landfill Solar Project | NJR Clean Energy Ventures Corporation | Norfolk, CT | 494 MWh | Nov 2024 | Dec 2024 | Solar |
| Niagara Depot Solar | Niagara Depot Solar, LLC | Niagara Falls, NY | 5 GWh | Jun 2023 | Dec 2024 | Solar |
| Lewiston Junction Road Solar | NextGrid Peppertree, LLC | Poland, ME | 7 GWh | Dec 2021 | Dec 2024 | Solar |
| Webb Road Solar | NextGrid Mastic, LLC | Waterville, ME | 6 GWh | Aug 2022 | Dec 2024 | Solar |
| Merrill Road Solar | NextGrid Mangrove, LLC | Lewiston, ME | 7 GWh | Feb 2022 | Dec 2024 | Solar |
| Corkwood Solar (CSG) | NextGrid Corkwood, LLC | Howland, ME | 5 GWh | Oct 2023 | Dec 2024 | Solar |
| Lisbon Street Solar | NextGrid Cliffrose, LLC | Lewiston, ME | 3 GWh | Mar 2022 | Dec 2024 | Solar |
| Broadway Solar (CSG) | NextGrid Bitterbush, LLC | Bangor, ME | 5 GWh | Aug 2023 | Dec 2024 | Solar |
| Granite Reliable Power | NexteraEnergy | Dummer, NH | 195 GWh | Jan 2012 | Sep 2025 | Wind |
| Nashua Plant | NextEra Renewable Fuels, LLC | Nashua, NH | 13 GWh | Mar 1996 | Dec 2024 | Landfill Gas |
| Moretown | NextEra Renewable Fuels, LLC | Waterbury, VT | 5 GWh | Nov 2008 | Dec 2023 | Landfill Gas |
| Seabrook | NextEra Energy Seabrook LLC | Seabrook, NH | 10 TWh | Jul 1990 | Sep 2025 | Nuclear |
| Upper Blackstone (MA) Treasure Valley | Nexamp Treasure Valley Solar, LLC | Rutland, MA | 7 GWh | Jun 2014 | Dec 2024 | Solar |
| Nexamp Peak CSG | Nexamp Peak, LLC | Hancock, MA | 2 GWh | Nov 2015 | Dec 2024 | Solar |
| Newton Rumford Landfill | Newton Municipal Solar LLC - Rumford | Newton, MA | 3 GWh | Jun 2017 | Dec 2024 | Solar |
| China Mill Hydro | New Hampshire Hydro Associates | Allenstown, NH | 3 GWh | Jun 1981 | Dec 2024 | Water |
| CCSU Fuel Cell Project | New Britain Renewable Energy, LLC | New Britain, CT | 11 GWh | Mar 2012 | Dec 2024 | Natural Gas |
| NE Renewable Whitefield, LLC | NE Renewable Whitefield, LLC | Whitefield, NH | 54 GWh | Feb 1988 | Dec 2024 | Wood/Wood Waste Solids |
| NE Renewable Springfield, LLC | NE Renewable Springfield, LLC | Springfield, NH | 33 GWh | Nov 1987 | Dec 2024 | Wood/Wood Waste Solids |
| NE Renewable Fitchburg, LLC | NE Renewable Fitchburg, LLC | Westminster, MA | 61 GWh | Jul 1992 | Dec 2024 | Wood/Wood Waste Solids : 98.1% Natural Gas : 1.9% |
| Rumford Cogeneration | ND Paper, Inc. | Rumford, ME | 429 GWh | Dec 1989 | Sep 2025 | Black Liquor : 51.5% Tire-derived Fuels : 22.6% Wood/Wood Waste Solids : 14.3% Bituminous Coal : 7.6% Residual Fuel Oil : 3.2% Sludge Waste : 0.9% |
| Westport MA 2 Community Solar | Navisun LLC | Westport, MA | 2 GWh | Aug 2016 | Dec 2024 | Solar |
| Carver MA 1 Community Solar | Navisun LLC | Carver, MA | 3 GWh | Aug 2016 | Dec 2024 | Solar |
| Westport MA 1 Community Solar | Navisun LLC | Westport, MA | 2 GWh | Aug 2016 | Dec 2024 | Solar |
| Wareham MA 1 Community Solar | Navisun LLC | Wareham, MA | 3 GWh | Aug 2016 | Dec 2024 | Solar |
| Seaboard Charlton, LLC | Navisun LLC | Charlton, MA | 3 GWh | Nov 2020 | Dec 2024 | Solar |
| BWC Beech Ridge Brook, LLC | Navisun LLC | Scarborough, ME | 8 GWh | Apr 2023 | Dec 2024 | Solar |
| Douglas Pike Solar, LLC | Navisun LLC | Burrillville, RI | 3 GWh | May 2023 | Dec 2024 | Solar |
| OSG Solar 1 LLC | Navisun LLC | Orange, MA | 3 GWh | Jun 2012 | Dec 2024 | Solar |
| Seaboard Oxford, LLC | Navisun LLC | Oxford, MA | 3 GWh | Jul 2020 | Dec 2024 | Solar |
| Seaboard Sheffield, LLC | Navisun LLC | Sheffield, MA | 2 GWh | Mar 2021 | Dec 2024 | Solar |
| BWC Rams Horn Channel LLC | Navisun LLC | Beverly, MA | 6 GWh | Nov 2020 | Dec 2024 | Solar |
| Freetown MA 1, LLC | Navisun LLC | Freetown, MA | 2 GWh | Nov 2022 | Dec 2024 | Solar |
| BWC Unity Pond LLC | Navisun LLC | Benton, ME | 8 GWh | Nov 2023 | Dec 2024 | Solar |
| ISM Solar Shepherd Acres | Navisun LLC | South Paris, ME | 65 MWh | Nov 2024 | Dec 2024 | Solar |
| BWC Maces Pond LLC | Navisun LLC | Rockport, ME | 5 GWh | Nov 2021 | Dec 2024 | Solar |
| Acushnet MA 2 (CSG) | Navisun LLC | Acushnet, MA | 1 GWh | Feb 2024 | Dec 2024 | Solar |
| Acushnet MA 1 | Navisun LLC | Acushnet, MA | 2 GWh | Nov 2023 | Dec 2024 | Solar |
| Wells (ME) | Nautilus Solar Solutions | Wells, ME | 6 GWh | Jun 2022 | Dec 2024 | Solar |
| Washington WS01 | Nautilus Solar Solutions | Washington, ME | 6 GWh | May 2022 | Dec 2024 | Solar |
| Town House | Nautilus Solar Solutions | Chelsea, ME | 8 GWh | Nov 2022 | Dec 2024 | Solar |
| Standish | Nautilus Solar Solutions | Standish, ME | 7 GWh | Sep 2023 | Dec 2024 | Solar |
| Sidney | Nautilus Solar Solutions | Sidney, ME | 2 GWh | Apr 2023 | Dec 2024 | Solar |
| Athens AT01 | Nautilus Solar Solutions | Athens, ME | 7 GWh | May 2022 | Dec 2024 | Solar |
| Mechanic Street (CSG) | Nautilus Solar Solutions | Presque Island, ME | 3 MWh | Nov 2024 | Dec 2024 | Solar |
| Dynamic - Leeds Solar (CSG) | Nautilus Solar Solutions | Leeds, ME | 473 MWh | Oct 2024 | Dec 2024 | Solar |
| Dynamic - Norridgewock Martin Stream (CSG) | Nautilus Solar Solutions | Norridgewock, ME | 206 MWh | Oct 2024 | Dec 2024 | Solar |
| Sanford CGA | Nautilus Solar Solutions | Sanford, ME | 230 MWh | May 2022 | Dec 2024 | Solar |
| Farmingdale FA01 | Nautilus Solar Solutions | Farmingdale, ME | 8 GWh | May 2022 | Dec 2024 | Solar |
| TPE King Solar Holdings1, LLC (CSG) | Nautilus Solar Solutions | North Smithfield, RI | 18 GWh | Mar 2022 | Dec 2024 | Solar |
| Brewer (CSG) | Nautilus Solar Solutions | Brewer, ME | 2 GWh | Jul 2024 | Dec 2024 | Solar |
| Shaker | Nautilus Solar Solutions | Gray, ME | 6 GWh | Jun 2022 | Dec 2024 | Solar |
| Sanford -NY | Nautilus Solar Solutions | Sanford, ME | 7 GWh | Jan 2024 | Dec 2024 | Solar |
| Sabattus SB01 | Nautilus Solar Solutions | Sabattus, ME | 8 GWh | Sep 2023 | Dec 2024 | Solar |
| Ryans Ranch | Nautilus Solar Solutions | Paris, ME | 3 GWh | May 2022 | Dec 2024 | Solar |
| Quarry | Nautilus Solar Solutions | North Berwick, ME | 10 GWh | Nov 2022 | Dec 2024 | Solar |
| Oakland | Nautilus Solar Solutions | Oakland, ME | 9 GWh | Aug 2022 | Dec 2024 | Solar |
| BNRG North Anson (CSG) | Nautilus Solar Solutions | North Anson, ME | 143 MWh | Oct 2024 | Dec 2024 | Solar |
| BNRG Norridgewock (CSG) | Nautilus Solar Solutions | Norridgewock, ME | 171 MWh | Oct 2024 | Dec 2024 | Solar |
| BRNG Nicolin (CSG) | Nautilus Solar Solutions | Ellsworth, ME | 205 MWh | Nov 2024 | Dec 2024 | Solar |
| Missile Street (CSG) | Nautilus Solar Solutions | Presque Island, ME | 4 MWh | Nov 2024 | Dec 2024 | Solar |
| North Bridgton | Nautilus Solar Solutions | Oakland, ME | 8 GWh | Oct 2022 | Dec 2024 | Solar |
Surrounding Balancing Authorities
| Rank | Balancing Authority | Annual Net Generation | # Power Plants |
|---|---|---|---|
| #61 | Alcoa Power Generating, Inc. - Yadkin Division | 696.7 GWh | 4 |
| #25 | Dominion Energy South Carolina, Inc. | 25.7 TWh | 87 |
| #13 | Duke Energy Carolinas | 112.5 TWh | 565 |
| #17 | Duke Energy Progress East | 64.3 TWh | 559 |
| #52 | Duke Energy Progress West | 4.3 TWh | 10 |
| #24 | Louisville Gas and Electric Company and Kentucky Utilities Company | 34.4 TWh | 25 |
| #12 | New York Independent System Operator | 131.6 TWh | 1,211 |
| #1 | PJM Interconnection, LLC | 870.7 TWh | 2,465 |
| #30 | South Carolina Public Service Authority | 18.9 TWh | 34 |
| #59 | Southeastern Power Administration | 1.5 TWh | 11 |
Balancing Authorities with Similar Net Generation
| Rank | Balancing Authority | Annual Net Generation | # Power Plants |
|---|---|---|---|
| #7 | California Independent System Operator | 188.0 TWh | 2,075 |
| #9 | Tennessee Valley Authority | 161.6 TWh | 204 |
| #10 | Florida Power & Light Co. | 148.9 TWh | 187 |
| #12 | New York Independent System Operator | 131.6 TWh | 1,211 |
| #13 | Duke Energy Carolinas | 112.5 TWh | 565 |
| #15 | ISO New England | 105.5 TWh | 1,577 |
| #16 | Bonneville Power Administration | 80.5 TWh | 163 |
| #17 | Duke Energy Progress East | 64.3 TWh | 559 |
| #18 | PacifiCorp East | 61.1 TWh | 216 |
| #19 | Salt River Project Agricultural Improvement and Power District | 60.0 TWh | 48 |