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

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Plant Name	Utility	Location	Annual Generation	Plant Date	Last Update	Fuel Types
Pisgah Mountain Wind	Pisgah Mountain, LLC	Clifton, ME	28 GWh	Nov 2016	Dec 2025	Wind
Pfizer Groton Plant	Pfizer Inc	Groton, CT	75 GWh	Dec 1947	May 2026	Natural Gas : 88.5% Distillate Fuel Oil : 11.5%
Peterson Road Solar	Peterson Road Solar, LLC	Palmer, MA	4 GWh	Mar 2017	Dec 2025	Solar
Pepperidge Farm Bloomfield	Pepperidge Farm, Inc.- Bloomfield	Bloomfield, CT	15 GWh	Jul 2008	Dec 2024	Natural Gas
Penobscot Narrows Solar I	Penobscot Narrows Solar I LLC	Bucksport, ME	7 GWh	May 2024	Dec 2025	Solar
Pendleton Solar 1	Pendleton Solar 1, LLC	Lockport, NY	7 GWh	Sep 2020	Dec 2025	Solar
Partridgeville Hybrid CSG	Partridgeville Road Solar 1, LLC	Athol, MA	6 GWh	Dec 2019	Dec 2024	Solar
ME - EDFR - Phase I - Bristol	Overlook Solar Partners, LLC	Bristol, ME	9 GWh	Nov 2023	Dec 2025	Solar
Gardner - Otter River Road	Otter River Road Solar LLC	Gardner, MA	4 GWh	Sep 2019	Dec 2025	Solar
MA Solar Storage 1 Hybrid	Origis Energy USA, Inc	Sterling, MA	1 GWh	Feb 2018	Dec 2025	Solar
Winchendon Landfill Solar	Onyx Asset Services Group	Winchendon, MA	3 GWh	Sep 2018	Dec 2024	Solar
Onyx - Pembroke Landfill Solar	Onyx Asset Services Group	Pembroke, MA	3 GWh	Nov 2017	Dec 2025	Solar
Onyx - Brockton Thatcher Landfill Solar	Onyx Asset Services Group	Brockton, MA	5 GWh	Oct 2017	Dec 2025	Solar
Barrett Farm Solar - Phase I	Onyx Asset Services Group	Thompson, CT	3 GWh	Sep 2017	Dec 2024	Solar
Manchester Community College North	Onyx Asset Services Group	Great Path, CT	1 GWh	Sep 2018	Dec 2024	Solar
Manchester Community College East	Onyx Asset Services Group	Manchester, CT	2 GWh	Sep 2018	Dec 2024	Solar
Ellington - 277 Sadds Mill	Onyx Asset Services Group	Ellington, CT	4 GWh	Feb 2024	Dec 2025	Solar
Stanley Black & Decker	Onyx Asset Services Group	East Longmeadow, MA	6 MWh	Nov 2025	Dec 2025	Solar
Hancock Wind Plant	Onward Energy	T22 MD, ME	112 GWh	Nov 2016	May 2026	Wind
Bingham Wind	Onward Energy	Bingham, ME	474 GWh	Nov 2016	May 2026	Wind
Oakfield Wind Project	Onward Energy	City of Oakfield, ME	340 GWh	Sep 2015	May 2026	Wind
Somers Solar Center, LLC	Onward Energy	Somers, CT	9 GWh	Nov 2013	Dec 2025	Solar
Trinity College Fuel Cell	Onsite Partners, LLC	Hartford, CT	12 GWh	Jul 2018	Dec 2024	Natural Gas
North Smithfield Solar Power 1	Onsite Partners, LLC	North Smithfield, RI	2 GWh	Nov 2018	Dec 2025	Solar
Cold River Road Solar	Onsite Partners, LLC	North Clarendon, VT	3 GWh	Nov 2016	Dec 2025	Solar
Pine Hill	Onsite Partners, LLC	Johnston, RI	8 GWh	Jul 2020	Dec 2025	Solar
Old Frontier Solar III	Old Frontier Solar III PV, LLC	South Deerfield, MA	4 GWh	Aug 2022	Dec 2025	Solar
Covanta Haverhill	Ogden Projects Inc-Haverhill	Haverhill, MA	287 GWh	Apr 1989	May 2026	Non-biogenic Municipal Solid Waste : 52.8% Biogenic Municipal Solid Waste : 43.2% Distillate Fuel Oil : 4.1%
Ocean State Power II	Ocean State Power II	Harrisville, RI	577 GWh	Sep 1991	Dec 2025	Natural Gas : 99.9%
Ocean State Power	Ocean State Power Co	Harrisville, RI	1 TWh	Nov 1990	Dec 2025	Natural Gas : 99.7%
Bourne (MA) - Holliston I	NVT LICENSES, LLC	Holliston, MA	3 GWh	Nov 2014	Dec 2025	Solar
Nutmeg Solar	Nutmeg Solar LLC	Enfield, CT	35 GWh	Nov 2020	Dec 2025	Solar
580 River Solar	NuGen Capital Management	Winchendon, MA	4 GWh	Aug 2018	Dec 2025	Solar
Bristol Landfill Solar	NuGen Capital Management	Bristol, RI	9 GWh	Feb 2024	Dec 2025	Solar
Halifax Solar	NuGen Capital Management	Halifax, MA	4 GWh	Jul 2015	Dec 2025	Solar
Fairview Farms Solar	NuGen Capital Management	Whately, MA	3 GWh	May 2014	Dec 2025	Solar
433 Purchase Solar NG, LLC	NuGen Capital Management	Swansea, MA	4 GWh	Mar 2012	Dec 2025	Solar
265 Pleasant Solar NG, LLC	NuGen Capital Management	Lunenburg, MA	1 GWh	Jun 2014	Dec 2025	Solar
301 Chestnut Solar NG	NuGen Capital Management	East Longmeadow, MA	2 GWh	Mar 2017	Dec 2025	Solar
Tolland Solar NG LLC	NuGen Capital Management	Tolland, MA	5 GWh	Sep 2014	Dec 2025	Solar
Hadley Solar NG, LLC	NuGen Capital Management	Hadley, MA	3 GWh	Jun 2014	Dec 2025	Solar
East Acres Solar NG, LLC	NuGen Capital Management	Pittsfield, MA	5 GWh	Mar 2017	Dec 2025	Solar
Vuelta Solar	NuGen Capital Management	East Brookfield, MA	7 GWh	Dec 2015	Dec 2025	Solar
Old Wardour Solar	NuGen Capital Management	East Brookfield, MA	7 GWh	Dec 2015	Dec 2025	Solar
10 Briggs Solar NG, LLC (East)	NuGen Capital Management	East Greenwich, RI	8 GWh	May 2021	Dec 2025	Solar
Shuman Solar	NuGen Capital Management	Stoughton, MA	2 GWh	Mar 2016	Dec 2025	Solar
651 Chase Solar NG	NuGen Capital Management	Lunenburg, MA	4 GWh	May 2014	Dec 2025	Solar
Hampden Solar PV	NSTAR Electric Company	Hampden, MA	6 GWh	Oct 2019	Dec 2025	Solar
Pittsfield 44 - M&W PV	NSTAR Electric Company	Pittsfield, MA	2 GWh	Jul 2018	Dec 2025	Solar
Lee Site 31 Solar	NSTAR Electric Company	Lee, MA	149 MWh	Jul 2018	Dec 2025	Solar
Plymouth Solar	NSTAR Electric Company	Plymouth, MA	2 GWh	May 2018	Dec 2025	Solar
Springfield Solar PV	NSTAR Electric Company	Springfield, MA	6 GWh	Dec 2018	Dec 2025	Solar
Wareham Solar PV	NSTAR Electric Company	Wareham, MA	1 GWh	Nov 2018	Dec 2025	Solar
East Longmeadow Solar PV	NSTAR Electric Company	East Longmeadow, MA	8 GWh	Sep 2019	Dec 2025	Solar
Ludlow Site 72 - Conti	NSTAR Electric Company	Ludlow, MA	3 GWh	Jul 2018	Dec 2025	Solar
East Springfield Solar PV	NSTAR Electric Company	Springfield, MA	2 GWh	Sep 2018	Dec 2025	Solar
Southampton Solar PV	NSTAR Electric Company	Southampton, MA	3 GWh	Jan 2019	Dec 2025	Solar
Savoy Solar PV	NSTAR Electric Company	Savoy, MA	3 GWh	Jan 2019	Dec 2025	Solar
Southwick Solar PV	NSTAR Electric Company	Southwick, MA	8 GWh	Dec 2018	May 2026	Solar
Hinsdale Solar PV	NSTAR Electric Company	Hinsdale, MA	3 GWh	Dec 2018	Dec 2025	Solar
Greenfield Solar PV	NSTAR Electric Company	Greenfield, MA	3 GWh	Dec 2018	Dec 2025	Solar
Montague Site 36-Grosolar	NSTAR Electric Company	Millers Falls, MA	6 GWh	Sep 2018	May 2026	Solar
Hatfield Solar PV	NSTAR Electric Company	Hatfield, MA	5 GWh	Nov 2018	Dec 2025	Solar
Sunderland Solar PV	NSTAR Electric Company	Sunderland, MA	2 GWh	Aug 2018	Dec 2025	Solar
Renew Canal 1 CSG LLC	NRG Renew Canal 1 LLC	Sandwich, MA	2 GWh	May 2017	Dec 2024	Solar
Middleton Solar Park	Novis Renewables, LLC	Middleton, MA	7 GWh	May 2018	Dec 2024	Solar
Notus Wind 1	Notus Clean Energy LLC	E. Falmouth, MA	5 GWh	Jun 2010	Dec 2025	Wind
Norton Powerhouse 2	Norton Powerhouse 2	Worcester, MA	29 GWh	Oct 2022	Dec 2025	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 2025	Solar
River Road	Norridgewock River Road Solar, LLC	Norridgewock, ME	8 GWh	Feb 2022	Dec 2025	Solar
Howard Lane Solar	NJR Clean Energy Ventures Corporation	Glocester, RI	2 GWh	Aug 2023	Dec 2025	Solar
Norfolk Landfill Solar Project	NJR Clean Energy Ventures Corporation	Norfolk, CT	6 GWh	Nov 2024	Dec 2025	Solar
Raffia Road Solar Project	NJR Clean Energy Ventures Corporation	Enfield, CT	7 GWh	Nov 2024	Dec 2025	Solar
CP East Hampton I & II Solar	NJR Clean Energy Ventures Corporation	East Hampton, CT	3 GWh	Jan 2021	Dec 2024	Solar
East Windsor	NJR Clean Energy Ventures Corporation	East Windsor, CT	869 MWh	Aug 2025	Dec 2025	Solar
Glastonbury Solar One	NJR Clean Energy Ventures Corporation	Glastonbury, CT	821 MWh	Aug 2025	Dec 2025	Solar
Niagara Depot Solar	Niagara Depot Solar, LLC	Niagara Falls, NY	5 GWh	Jun 2023	Dec 2025	Solar
Lewiston Junction Road Solar	NextGrid Peppertree, LLC	Poland, ME	7 GWh	Dec 2021	Dec 2025	Solar
Webb Road Solar	NextGrid Mastic, LLC	Waterville, ME	5 GWh	Aug 2022	Dec 2025	Solar
Merrill Road Solar	NextGrid Mangrove, LLC	Lewiston, ME	6 GWh	Feb 2022	Dec 2025	Solar
Corkwood Solar (CSG)	NextGrid Corkwood, LLC	Howland, ME	6 GWh	Oct 2023	Dec 2025	Solar
Lisbon Street Solar	NextGrid Cliffrose, LLC	Lewiston, ME	3 GWh	Mar 2022	Dec 2025	Solar
Broadway Solar (CSG)	NextGrid Bitterbush, LLC	Bangor, ME	6 GWh	Aug 2023	Dec 2025	Solar
Granite Reliable Power	NexteraEnergy	Dummer, NH	192 GWh	Jan 2012	May 2026	Wind
Nashua Plant	NextEra Renewable Fuels, LLC	Nashua, NH	13 GWh	Mar 1996	Dec 2025	Landfill Gas
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	May 2026	Nuclear
Upper Blackstone (MA) Treasure Valley	Nexamp Treasure Valley Solar, LLC	Rutland, MA	6 GWh	Jun 2014	Dec 2025	Solar
Nexamp Peak CSG	Nexamp Peak, LLC	Hancock, MA	2 GWh	Nov 2015	Dec 2025	Solar
Newton Rumford Landfill	Newton Municipal Solar LLC - Rumford	Newton, MA	2 GWh	Jun 2017	Dec 2025	Solar
China Mill Hydro	New Hampshire Hydro Associates	Allenstown, NH	3 GWh	Jun 1981	Dec 2025	Water
CCSU Fuel Cell Project	New Britain Renewable Energy, LLC	New Britain, CT	7 GWh	Mar 2012	Dec 2025	Natural Gas
NE Renewable Whitefield, LLC	NE Renewable Whitefield, LLC	Whitefield, NH	59 GWh	Feb 1988	Dec 2025	Wood/Wood Waste Solids
NE Renewable Tamworth, LLC	NE Renewable Tamworth, LLC	Tamworth, NH	78 GWh	Nov 1987	Dec 2025	Wood/Wood Waste Solids
NE Renewable Springfield, LLC	NE Renewable Springfield, LLC	Springfield, NH	73 GWh	Nov 1987	Dec 2025	Wood/Wood Waste Solids
NE Renewable Fitchburg, LLC	NE Renewable Fitchburg, LLC	Westminster, MA	79 GWh	Jul 1992	Dec 2025	Wood/Wood Waste Solids : 98.7% Natural Gas : 1.3%
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	400 GWh	Dec 1989	May 2026	Black Liquor : 55.5% Tire-derived Fuels : 20.6% Wood/Wood Waste Solids : 16.0% Bituminous Coal : 6.1% Residual Fuel Oil : 1.2% Sludge Waste : 0.7%
Westport MA 1 Community Solar	Navisun LLC	Westport, MA	2 GWh	Aug 2016	Dec 2025	Solar
Carver MA 1 Community Solar	Navisun LLC	Carver, MA	3 GWh	Aug 2016	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