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	Oct 2026
Annual Generation	112.2 TWh
Power Plants	1,667
Utilities	846
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% Nuclear \| 25.3% Wind \| 5.7% Water \| 4.6% Other Fuel \| 4.5% Solar \| 1.6% Coal \| 0%

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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
Ryegate Associates, LLC	Ryegate Associates, LLC	East Ryegate, VT	158 GWh	Aug 1992	Dec 2025	Wood/Wood Waste Solids
S C Moore	Great River Hydro, LLC	Littleton, NH	255 GWh	Dec 1956	Dec 2025	Water
S D Warren Westbrook	Relevate Power Management LLC	Westbrook, ME	15 GWh	Dec 1902	Dec 2025	Water
Sabattus SB01	Nautilus Solar Solutions	Sabattus, ME	8 GWh	Sep 2023	Dec 2025	Solar
Saddleback Ridge Wind Farm	CPV Saddleback Ridge Wind, LLC	Carthage, ME	90 GWh	Nov 2014	Dec 2025	Wind
Saddleback Solar	SoCore Energy LLC	Lanesborough, MA	4 GWh	Aug 2022	Dec 2025	Solar
Saint Albans Solar	Cypress Creek Renewables	Georgia, VT	7 GWh	Sep 2018	Dec 2025	Solar
Salem Harbor Power Development LP	Salem Harbor Power Development LP	Salem, MA	1 TWh	Apr 2018	Jul 2026	Natural Gas
Salisbury	Green Mountain Power Corp	Salisbury, VT	2 GWh	Jan 1917	Dec 2025	Water
Salmon Falls	Green Mountain Power Corp	South Berwick, ME	2 GWh	Jun 1986	Dec 2025	Water
Samoset Solar	Samoset Solar, LLC	Rockport, ME	4 GWh	Jun 2023	Dec 2025	Solar
Sampson Road Community Solar	Sampson Road Solar, LLC	Charlton, MA	3 GWh	Nov 2017	Dec 2025	Solar
Sand Road	LSE Phoenix LLC	North Canaan, CT	3 GWh	Oct 2021	Dec 2025	Solar
Sandwich	LSE Ophiuchus LLC	Sandwich, MA	4 GWh	Jun 2023	Dec 2025	Solar
Sanford CGA	Nautilus Solar Solutions	Sanford, ME	8 GWh	May 2022	Dec 2025	Solar
Sanford -NY	Nautilus Solar Solutions	Sanford, ME	8 GWh	Jan 2024	Dec 2025	Solar
Sanford Solar	Sanford Airport Solar, LLC	Sanford, ME	89 GWh	Oct 2020	Jul 2026	Solar
Saratoga Solar III, LLC	Green Street Power Partners	Middle Grove, NY	5 GWh	Nov 2023	Dec 2025	Solar
Saratoga Solar IV, LLC	Green Street Power Partners	Rock City Falls, NY	5 GWh	Sep 2023	Dec 2025	Solar
Savoy Solar PV	NSTAR Electric Company	Savoy, MA	3 GWh	Jan 2019	Dec 2025	Solar
Schiller	Granite Shore Power	Portsmouth, NH	561 MWh	Sep 1952	Jul 2026	Jet Fuel
Scituate PV	AES Distributed Energy	Scituate, MA	3 GWh	Sep 2013	Dec 2025	Solar
Scituate Wind	Scituate Wind LLC	Scituate, MA	3 GWh	Feb 2012	Dec 2025	Wind
Scotland Dam	FirstLight Power Resources Services LLC	Windham, CT	4 GWh	Dec 1936	Dec 2025	Water
SCS Harpswell 012903 Brunswick, LLC	Arevon Energy, Inc.	Brunswick, ME	7 GWh	Oct 2022	Dec 2025	Solar
Seaboard Charlton, LLC	Navisun LLC	Charlton, MA	3 GWh	Nov 2020	Dec 2025	Solar
Seaboard Oxford, LLC	Navisun LLC	Oxford, MA	3 GWh	Jul 2020	Dec 2025	Solar
Seaboard Sheffield, LLC	Navisun LLC	Sheffield, MA	2 GWh	Mar 2021	Dec 2025	Solar
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	Jul 2026	Nuclear
Searsburg	Great River Hydro, LLC	Searsburg, VT	16 GWh	Feb 1922	Dec 2025	Water
Searsburg Wind Turbine	Green Mountain Power Corp	Searsburg, VT	10 GWh	May 1997	Jul 2026	Wind
SELCO Community Solar	Massachusetts Mun Wholes Electric Co	Shrewsbury, MA	5 GWh	May 2018	Dec 2025	Solar
SEMASS Resource Recovery	SEMASS Partnership	West Wareham, MA	546 GWh	Jun 1988	Jul 2026	Non-biogenic Municipal Solid Waste : 54.0% Biogenic Municipal Solid Waste : 44.1% Natural Gas : 1.7%
Settlers Solar	Settlers Solar, LLC	Lunenberg, MA	7 GWh	Nov 2020	Dec 2025	Solar
Shaffer	CD US Solar MT3, LLC	Billerica, MA	6 GWh	Aug 2014	Dec 2025	Solar
Shaker	Nautilus Solar Solutions	Gray, ME	6 GWh	Jun 2022	Dec 2025	Solar
Shawmut	Brookfield White Pine Hydro LLC	Shawmut, ME	23 GWh	Dec 1912	Dec 2025	Water
Sheffield Hewins	Navisun LLC	Sheffield, MA	2 GWh	Nov 2022	Dec 2025	Solar
Sheffield Wind	Evergreen Wind, LLC	Sheffield, VT	57 GWh	Sep 2011	Jul 2026	Wind
Sheldon Solar	Excelsior Energy Capital	Sheldon Springs, VT	2 GWh	Aug 2013	Dec 2025	Solar
Sheldon Springs Hydroelectric	Central Rivers Power US, LLC	Sheldon Springs, VT	52 GWh	Jun 1988	Dec 2025	Water
Shepaug	FirstLight Power Resources Services LLC	Southbury, CT	93 GWh	Dec 1954	Dec 2025	Water
Sheridan Road Solar Farm	Addicus Advisors	Ashland, ME	4 GWh	Jul 2024	Dec 2025	Solar
Sherman	Great River Hydro, LLC	Rowe, MA	28 GWh	Nov 1926	Dec 2025	Water
Sherman Solar	Ecos Energy LLC	Griswold, CT	2 GWh	Nov 2019	Dec 2025	Solar
Shirley Landfill	Altus Power America Management, LLC	Shirley, MA	1 GWh	Apr 2017	Dec 2025	Solar
Shirley Water	Altus Power America Management, LLC	Shirley, MA	3 GWh	Jul 2016	Dec 2025	Solar
Shrewsbury	Town of Shrewsbury - (MA)	Shrewsbury, MA	2 GWh	Oct 1969	Dec 2025	Distillate Fuel Oil
Shrewsbury Solar	RWE Clean Energy	Shrewsbury, MA	4 GWh	Sep 2012	Dec 2025	Solar
Shuman Solar	NuGen Capital Management	Stoughton, MA	2 GWh	Mar 2016	Dec 2025	Solar
Sidney	Nautilus Solar Solutions	Sidney, ME	2 GWh	Apr 2023	Dec 2025	Solar
Sikorsky Aircraft CHP	Sikorsky Aircraft Corporation	Stratford, CT	65 GWh	May 2010	Dec 2025	Natural Gas : 99.9%
Silver Lake Solar Photovoltaic Facility	Western Massachusetts Electric Company	Pittsfield, MA	2 GWh	Nov 2010	Dec 2025	Solar
Silver Lake (VT)	Green Mountain Power Corp	Salisbury, VT	5 GWh	Jan 1917	Dec 2025	Water
Silver Maple	WEB Silver Maple Wind LLC	Clifton, ME	64 GWh	Sep 2022	Dec 2025	Wind
SJA Solar LLC-Solterra Monastery CSG	SJA Solar, LLC	Spencer, MA	24 GWh	Nov 2016	Dec 2025	Solar
Skelton	Brookfield White Pine Hydro LLC	Dayton, ME	77 GWh	Dec 1947	Dec 2025	Water
Skyline Solar	SoCore Energy LLC	Lanesborough, MA	8 GWh	Aug 2022	Dec 2025	Solar
Skyway Avenue Solar Farm	REA Investments, LLC	Frenchville, ME	3 GWh	Feb 2024	Dec 2025	Solar
Smith College Central Heating Plant	The Trustees of Smith College	Northampton, MA	6 GWh	Sep 2008	Dec 2025	Natural Gas
Smith (NH)	Central Rivers Power NH, LLC	Berlin, NH	87 GWh	Jul 1948	Dec 2025	Water
Smith (VT)	Green Mountain Power Corp	Bradford, VT	2 GWh	Nov 1982	Dec 2025	Water
Smith & Wesson at Springfield MA PV	Luminace Solar Massachusetts, LLC	Springfield, MA	2 GWh	Jun 2017	Dec 2025	Solar
Smithfield Solar Farm, LLC	Smithfield Solar Farm	Smithfield, RI	4 GWh	Jun 2020	Dec 2025	Solar
Solar Mule, LLC	Solar Mule, LLC	Oakland, ME	2 GWh	Aug 2017	Dec 2025	Solar
Solten Plainville 6000, LLC	Altus Power America Management, LLC	Plainville, MA	7 GWh	Jul 2017	Dec 2025	Solar
Somers Solar Center, LLC	Onward Energy	Somers, CT	9 GWh	Nov 2013	Dec 2025	Solar
Somerset Plant	Sappi Fine Paper North America-Somerset	Skowhegan, ME	565 GWh	Dec 1975	Jul 2026	Black Liquor : 47.1% Wood/Wood Waste Solids : 31.7% Natural Gas : 13.0% Tire-derived Fuels : 4.1% Residual Fuel Oil : 3.4% Sludge Waste : 0.5%
Somersworth Lower Great Dam	Green Mountain Power Corp	Somersworth, NH	498 MWh	Jun 1985	Dec 2025	Water
South Street - Middlebury	Greenbacker Renewable Energy Corporation	Middlebury, VT	9 GWh	Nov 2023	Dec 2025	Solar
South Windsor Fuel Cell	South Energy Investments LLC	South Windsor, CT	37 GWh	Feb 2020	Dec 2025	Natural Gas
Southampton Solar PV	NSTAR Electric Company	Southampton, MA	3 GWh	Jan 2019	Dec 2025	Solar
Southbridge Landfill Gas-to-Energy	Southbridge Recycling and Disposal Park	Southbridge, MA	10 GWh	Sep 2011	Dec 2025	Landfill Gas
Southbridge PV	Terraform Arcadia	Southbridge, MA	4 GWh	Dec 2013	Dec 2025	Solar
Southbridge Solar	AES Distributed Energy	Southbridge, MA	2 GWh	Feb 2016	Jul 2026	Solar
Southern Sky Renew Energy Berkley LLC	Southern Sky Renewable Energy Berkley, LLC	Berkley, MA	4 GWh	May 2014	Dec 2025	Solar
Southington Solar One	DG Connecticut III, LLC	Southington, CT	9 GWh	Jan 2022	Dec 2025	Solar
Southwick Solar, LLC Community Solar	Navisun LLC	Southwick, MA	4 GWh	Apr 2025	Dec 2025	Solar
Southwick Solar PV	NSTAR Electric Company	Southwick, MA	8 GWh	Dec 2018	Jul 2026	Solar
SP-231 Clifton	Madison Energy Investments LLC	Clifton, ME	5 GWh	Nov 2024	Dec 2025	Solar
SP-339 Mechanic Falls	Madison Energy Investments LLC	Mechanic Falls, ME	1 GWh	Nov 2024	Dec 2025	Solar
Spencer Solar CSG	Madison Energy Investments LLC	Spencer, MA	584 MWh	May 2025	Dec 2025	Solar
Spencer Solar MA	Citizens Enterprises Corporation	Spencer, MA	4 GWh	Feb 2020	Dec 2025	Solar
Spring Hill Road	AES Distributed Energy	Barre, MA	306 MWh	Nov 2015	Jul 2026	Solar
Spring Street Solar 1 CSG	Spring Street Solar 1, LLC	Carver, MA	3 GWh	Feb 2017	Dec 2025	Solar
Springfield Solar PV	NSTAR Electric Company	Springfield, MA	6 GWh	Dec 2018	Dec 2025	Solar
Spruce Mountain WInd	CPV Spruce Mountain Wind LLC	Bryant Pond, ME	53 GWh	Nov 2011	Dec 2025	Wind
SR Litchfield	SR Litchfield, LLC	Litchfield, CT	26 GWh	Jan 2025	Dec 2025	Solar
SR North Stonington	SR North Stonington, LLC	North Stonington, CT	15 GWh	Feb 2024	Dec 2025	Solar
St. Albans SPEED Project	St. Albans Solar Partners, LLC	St. Albans, VT	2 GWh	Nov 2013	Dec 2025	Solar
St. Joseph's Solar, LLC CSG	38 Degrees North, LLC	Charlton, MA	2 GWh	Nov 2017	Dec 2025	Solar
Stafford Hill Solar Hybrid	Green Mountain Power Corp	Rutland, VT	355 MWh	Feb 2015	Jun 2026	Solar
Stafford MS Ground Mount Community Solar	Town of Stafford - (CT)	Stafford, CT	3 GWh	Jun 2016	Dec 2025	Solar
Stafford St 2 Community Solar	Stafford St Solar 2, LLC	Lecister, MA	3 GWh	Apr 2018	Dec 2025	Solar
Stafford St Solar 1 CSG	Stafford St Solar 1, LLC	Leicester, MA	3 GWh	Nov 2017	Dec 2025	Solar
Stafford St Solar 3 CSG	Stafford St Solar 3, LLC	Leicester, MA	2 GWh	Nov 2017	Dec 2025	Solar
Stamford Health Tully Health Center	Stamford Health Tully Health Center	Stamford, CT	5 GWh	Apr 2002	Dec 2025	Natural Gas
Standish	Nautilus Solar Solutions	Standish, ME	7 GWh	Sep 2023	Dec 2025	Solar
Stanley Black & Decker	Onyx Asset Services Group	East Longmeadow, MA	6 MWh	Nov 2025	Dec 2025	Solar
State Street Solar LLC	CVI CleanCapital Solar 1 LLC	Palmer, MA	1 GWh	Mar 2014	Dec 2025	Solar

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	433.0 GWh	4
#24	Dominion Energy South Carolina, Inc.	26.1 TWh	83
#13	Duke Energy Carolinas	113.4 TWh	578
#17	Duke Energy Progress East	66.2 TWh	574
#50	Duke Energy Progress West	4.6 TWh	15
#23	Louisville Gas and Electric Company and Kentucky Utilities Company	34.2 TWh	25
#12	New York Independent System Operator	134.1 TWh	1,334
#1	PJM Interconnection, LLC	890.9 TWh	2,806
#28	South Carolina Public Service Authority	19.6 TWh	35
#59	Southeastern Power Administration	1.2 TWh	11

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#7	California Independent System Operator	168.7 TWh	2,170
#9	Tennessee Valley Authority	166.2 TWh	209
#10	Florida Power & Light Co.	153.0 TWh	188
#12	New York Independent System Operator	134.1 TWh	1,334
#13	Duke Energy Carolinas	113.4 TWh	578
#15	ISO New England	112.2 TWh	1,667
#16	Bonneville Power Administration	91.1 TWh	170
#17	Duke Energy Progress East	66.2 TWh	574
#18	PacifiCorp East	61.4 TWh	223
#19	Salt River Project Agricultural Improvement and Power District	60.5 TWh	51