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	May 2025
Annual Generation	103.6 TWh
Power Plants	1,487
Utilities	782
Ranked #15 out of 65 in terms of net annual generation
Ranked #11 out of 53 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 57.4% Nuclear \| 24.9% Water \| 6.1% Other Fuel \| 4.5% Wind \| 3.5% Solar \| 1.4% Coal \| 0.3%

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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
Williams Hydro	Brookfield White Pine Hydro LLC	Solon, ME	97 GWh	Dec 1938	Dec 2023	Water
Lawrence Hydroelectric Associates	Central Rivers Power US, LLC	Lawrence, MA	94 GWh	Jun 1981	Dec 2023	Water
Wheelabrator Concord Facility	Wheelabrator Environmental Systems	Concord, NH	93 GWh	Mar 1989	Feb 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Newington	Granite Shore Power	Newington, NH	93 GWh	May 1974	Feb 2025	Natural Gas : 59.5% Residual Fuel Oil : 39.9% Distillate Fuel Oil : 0.5%
Block Island Wind Farm	Deepwater Wind Block Island LLC	NA, RI	90 GWh	Nov 2016	Feb 2025	Wind
Weston Hydro	Brookfield White Pine Hydro LLC	Skowhegan, ME	88 GWh	Dec 1919	Dec 2023	Water
Deerfield Wind LLC	Avangrid Renewables LLC	Searsburg, VT	88 GWh	Nov 2017	Feb 2025	Wind
Sanford Solar	Sanford Airport Solar, LLC	Sanford, ME	88 GWh	Oct 2020	Feb 2025	Solar
Saddleback Ridge Wind Farm	CPV Saddleback Ridge Wind, LLC	Carthage, ME	83 GWh	Nov 2014	Dec 2023	Wind
Generate Colchester Fuel Cells, LLC	Generate Colchester Fuel Cells, LLC	Colchester, CT	82 GWh	Sep 2021	Dec 2023	Natural Gas
Androscoggin Energy Center	JGT2 Energy LLC	Jay, ME	82 GWh	Sep 1999	Dec 2023	Natural Gas : 96.1% Distillate Fuel Oil : 3.9%
Regional Waste Systems	Ecomaine	Portland, ME	82 GWh	May 1988	Feb 2025	Non-biogenic Municipal Solid Waste : 54.6% Biogenic Municipal Solid Waste : 44.6% Natural Gas : 0.8%
Bull Hill Wind Project	Evergreen Wind, LLC	Eastbrook, ME	82 GWh	Sep 2012	Dec 2023	Wind
Quinebaug Solar	Quinebaug Solar, LLC	Canterbury, CT	81 GWh	Nov 2021	Feb 2025	Solar
Pfizer Groton Plant	Pfizer Inc	Groton, CT	80 GWh	Dec 1947	Feb 2025	Natural Gas : 95.2% Distillate Fuel Oil : 4.8%
Sheldon Springs Hydroelectric	Central Rivers Power US, LLC	Sheldon Springs, VT	75 GWh	Jun 1988	Dec 2023	Water
Antrim Wind	Antrim Wind Energy LLC	Antrim, NH	74 GWh	Nov 2019	Feb 2025	Wind
Sheffield Wind	Evergreen Wind, LLC	Sheffield, VT	74 GWh	Sep 2011	Feb 2025	Wind
SJA Solar LLC-Solterra Monastery CSG	SJA Solar, LLC	Spencer, MA	72 GWh	Nov 2016	Dec 2023	Solar
Pejepscot Hydroelectric Project	Topsham Hydro Partners	Topsham, ME	71 GWh	Oct 1987	Dec 2023	Water
Berkshire Power	Berkshire Power Co LLC	Agawam, MA	70 GWh	Aug 1999	Dec 2023	Natural Gas
Robin Hollow Solar	Robin Hollow Solar, LLC	West Greenwich, RI	70 GWh	Nov 2023	Feb 2025	Solar
Hydro Kennebec Project	Hydro Kennebec LLC	Winslow, ME	70 GWh	Dec 1988	Dec 2023	Water
Deer Rips	Brookfield White Pine Hydro LLC	Auburn, ME	69 GWh	Dec 1902	Dec 2023	Water
Androscoggin Mill	Pixelle Androscoggin LLC	Jay, ME	69 GWh	Dec 1963	Mar 2023	Natural Gas : 51.1% Black Liquor : 37.4% Wood/Wood Waste Solids : 11.6%
Univ of Massachusetts Medical Center	University of Massachusetts Medical	Worcester, MA	68 GWh	Mar 1974	Dec 2023	Natural Gas : 97.4% Residual Fuel Oil : 2.4%
New England Wind LLC	Avangrid Renewables LLC	Florida, MA	68 GWh	Nov 2012	Feb 2025	Wind
Dry Bridge Solar (Brown University)	MN8 Energy LLC	North Kingstown, RI	67 GWh	Oct 2023	Feb 2025	Solar
Red Shield Envir Old Town Facility	ND Paper, Inc.	Old Town, ME	66 GWh	Jun 1965	Apr 2023	Wood/Wood Waste Solids : 63.4% Black Liquor : 22.1% Natural Gas : 11.8% Residual Fuel Oil : 2.7%
Stony Brook	Massachusetts Mun Wholes Electric Co	Ludlow, MA	65 GWh	Oct 1981	Feb 2025	Distillate Fuel Oil : 74.0% Natural Gas : 26.0%
Lempster Wind LLC	Avangrid Renewables LLC	Lempster, NH	65 GWh	Nov 2008	Feb 2025	Wind
Sikorsky Aircraft CHP	Sikorsky Aircraft Corporation	Stratford, CT	64 GWh	May 2010	Dec 2023	Natural Gas : 99.9%
Deerfield 5	Great River Hydro, LLC	Florida, MA	63 GWh	Sep 1974	Dec 2023	Water
Gillette SBMC	The Gillette Company	Boston, MA	60 GWh	Jan 1971	Feb 2025	Natural Gas : 99.9%
Athens Energy	Athens Energy, LLC	Athens, ME	60 GWh	Sep 2016	Dec 2023	Wood/Wood Waste Solids
Pontook Hydro Facility	Pontook Operating LP	Dummer, NH	58 GWh	Nov 1986	Dec 2023	Water
Mcindoes	Great River Hydro, LLC	Barnet, VT	56 GWh	Dec 1930	Dec 2023	Water
Boott Hydropower	Boott Hydro, LLC - Hybrid	Lowell, MA	56 GWh	Sep 1985	Dec 2022	Water
Ayers Island	Central Rivers Power NH, LLC	Bristol, NH	54 GWh	Jul 1925	Dec 2023	Water
Hiram	Brookfield White Pine Hydro LLC	Hiram, ME	54 GWh	Dec 1916	Dec 2023	Water
Milford Hydro Station	Brookfield Black Bear Hydro, LLC	Milford, ME	53 GWh	Jun 1941	Dec 2023	Water
DWW Solar ll	DWW Solar ll LLC	Simsbury, CT	53 GWh	Nov 2019	Feb 2025	Solar
Spruce Mountain WInd	CPV Spruce Mountain Wind LLC	Bryant Pond, ME	53 GWh	Nov 2011	Dec 2023	Wind
Falls Village	FirstLight Power Resources Services LLC	Falls Village, CT	52 GWh	Dec 1913	Dec 2023	Water
Silver Maple	WEB Silver Maple Wind LLC	Clifton, ME	52 GWh	Sep 2022	Dec 2023	Wind
Coventry Clean Energy Corporation	Washington Electric Coop - (VT)	Coventry, VT	52 GWh	Jun 2005	Dec 2023	Landfill Gas
William F Wyman Hybrid	FPL Energy Wyman LLC	Yarmouth, ME	50 GWh	Dec 1956	Feb 2025	Residual Fuel Oil : 99.2% Distillate Fuel Oil : 0.8%
Canton Mountain Wind	CPV Canton Mountain Wind LLC	Canton, ME	50 GWh	Oct 2017	Dec 2023	Wind
Highgate Falls	Village of Swanton - (VT)	Highgate, VT	50 GWh	Jul 1923	Dec 2023	Water
Cleary Flood Hybrid	City of Taunton	Taunton, MA	50 GWh	May 1966	Dec 2023	Natural Gas : 95.5% Distillate Fuel Oil : 4.5%
UNH 7.9 MW Plant	Emcor Energy Services	Durham, NH	49 GWh	Aug 2006	Feb 2025	Landfill Gas : 74.1% Natural Gas : 24.4% Distillate Fuel Oil : 1.6%
Milton	Green Mountain Power Corp	Milton, VT	48 GWh	Jan 1929	Dec 2023	Water
Stetson Wind II	Evergreen Wind, LLC	Danforth, ME	46 GWh	Feb 2010	Dec 2023	Wind
Bonny Eagle	Brookfield White Pine Hydro LLC	Hollis, ME	45 GWh	Dec 1909	Dec 2023	Water
New Haven Harbor	Generation Bridge II Connecticut, LLC	New Haven, CT	45 GWh	Jun 1975	Feb 2025	Natural Gas : 53.7% Residual Fuel Oil : 33.6% Kerosene : 10.8% Distillate Fuel Oil : 1.9%
Turnkey Landfill Gas Recovery	WM Renewable Energy LLC	Rochester, NH	45 GWh	Jan 1992	Dec 2023	Landfill Gas
Garvins Falls	Central Rivers Power NH, LLC	Bow, NH	44 GWh	Jul 1925	Dec 2023	Water
Hartford Hospital Cogeneration	Cartier Energy, LLC	Hartford, CT	44 GWh	Jun 1988	Dec 2023	Natural Gas : 99.8%
Erving Paper Mills	Erving Paper Mills Inc	Erving, MA	43 GWh	Nov 2013	Feb 2025	Natural Gas : 98.0% Distillate Fuel Oil : 2.0%
Pfizer Groton Fuel Cell	Groton Fuel Cell 1 LLC	Groton, CT	42 GWh	Sep 2016	Dec 2023	Natural Gas
Bulls Bridge	FirstLight Power Resources Services LLC	New Milford, CT	42 GWh	Dec 1902	Dec 2023	Water
Riverside Holyoke	City of Holyoke Gas and Electric Dept.	Holyoke, MA	40 GWh	Dec 1905	Dec 2023	Water
Georges River Energy	Robbins Lumber Inc	Searsmont, ME	40 GWh	Nov 2018	Dec 2023	Wood/Wood Waste Solids
Waterbury Generation	Engie North America	Waterbury, CT	40 GWh	May 2009	Dec 2023	Natural Gas : 99.7%
Fusion Solar Center LLC	Fusion Solar Centre, L.L.C	Baltic, CT	40 GWh	Feb 2018	Feb 2025	Solar
Deerfield 2	Great River Hydro, LLC	Conway, MA	39 GWh	Jul 1913	Dec 2023	Water
South Windsor Fuel Cell	South Energy Investments LLC	South Windsor, CT	39 GWh	Feb 2020	Dec 2023	Natural Gas
Essex Junction 19	Green Mountain Power Corp	Essex Junction, VT	39 GWh	Dec 1916	Feb 2025	Water : 99.6%
Aziscohos Hydroelectric Project	Brookfield White Pine Hydro LLC	Wilson Mills, ME	39 GWh	May 1988	Dec 2023	Water
Shawmut	Brookfield White Pine Hydro LLC	Shawmut, ME	37 GWh	Dec 1912	Dec 2023	Water
NE Renewable Fitchburg, LLC	NE Renewable Fitchburg, LLC	Westminster, MA	36 GWh	Jul 1992	Dec 2023	Wood/Wood Waste Solids : 97.6% Natural Gas : 2.4%
Chace Mill Winooski One	City of Burlington Electric - (VT)	Winooski, VT	36 GWh	Mar 1993	Dec 2023	Water
Peterson	Green Mountain Power Corp	Milton, VT	36 GWh	Jan 1948	Dec 2023	Water
Montville Station	NRG Montville Operations Inc	Uncasville, CT	36 GWh	Dec 1953	Dec 2023	Residual Fuel Oil : 65.3% Natural Gas : 33.4% Distillate Fuel Oil : 1.3%
Deer Island Treatment Plant	Massachusetts Wtr Rauth-Deer I	Winthrop, MA	36 GWh	Jul 1995	Feb 2025	Other Biomass Gas : 76.7% Distillate Fuel Oil : 13.6% Water : 5.8% Wind : 2.2% Solar : 1.7%
West Buxton	Brookfield White Pine Hydro LLC	Buxton, ME	36 GWh	Dec 1903	Dec 2023	Water
Sherman	Great River Hydro, LLC	Rowe, MA	35 GWh	Nov 1926	Dec 2023	Water
Ellsworth Hydro Station	Brookfield Black Bear Hydro, LLC	Ellsworth, ME	35 GWh	Jun 1924	Dec 2023	Water
Dartmouth Power Associates LP	Morris Energy Operations Company, LLC	Dartmouth, MA	35 GWh	Feb 1992	Dec 2023	Natural Gas : 99.0% Distillate Fuel Oil : 1.0%
Proctor	Green Mountain Power Corp	Proctor, VT	35 GWh	Jul 1905	Dec 2023	Water
Deerfield 3	Great River Hydro, LLC	Buckland, MA	34 GWh	Jul 1912	Dec 2023	Water
Subase Microgrid Project	Connecticut Mun Elec Engy Coop	Groton, CT	34 GWh	Nov 2022	Dec 2023	Natural Gas
Naval Sub Base New London Fuel Cell	Groton Station Fuel Cell, LLC	Groton, CT	34 GWh	Nov 2022	Dec 2023	Natural Gas
Fife Brook	Bear Swamp Power Company LLC	Florida, MA	33 GWh	Sep 1974	Dec 2023	Water
Nutmeg Solar	Nutmeg Solar LLC	Enfield, CT	33 GWh	Nov 2020	Dec 2023	Solar
Huntington Falls	Green Mountain Power Corp	Weybridge, VT	33 GWh	Sep 1988	Dec 2023	Water
Eastman Falls	Central Rivers Power NH, LLC	Franklin, NH	33 GWh	Jul 1937	Dec 2023	Water
S D Warren Westbrook	Elevate Power Management LLC	Westbrook, ME	33 GWh	Dec 1902	Dec 2023	Water
Dodge Falls Associates	Dodge Falls Associates LP	Bath, NH	32 GWh	Nov 1990	Dec 2023	Water
Potter Station 2	Town of Braintree - (MA)	Braintree, MA	32 GWh	Jun 1963	Dec 2023	Natural Gas : 88.2% Distillate Fuel Oil : 11.8%
NE Renewable Springfield, LLC	NE Renewable Springfield, LLC	Springfield, NH	32 GWh	Nov 1987	Dec 2023	Wood/Wood Waste Solids
Penobscot Energy Recovery	ESOCO Orrington LLC	Orrington, ME	31 GWh	Oct 1987	May 2023	Non-biogenic Municipal Solid Waste : 54.1% Biogenic Municipal Solid Waste : 44.3% Distillate Fuel Oil : 1.6%
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	31 GWh	Dec 1984	Feb 2025	Water
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	31 GWh	Jun 1990	Feb 2025	Natural Gas : 94.6% Distillate Fuel Oil : 5.4%
Eastern Maine Medical Center	Eastern Maine Medical Center	Bangor, ME	31 GWh	Sep 2006	Feb 2025	Natural Gas
North Stonington Solar Center, LLC	Adapture Renewables, Inc.	North Stonington, CT	31 GWh	Sep 2022	Dec 2023	Solar
Fitchburg Gas Recovery	WM Renewable Energy LLC	Westminster, MA	31 GWh	Sep 2007	Dec 2023	Landfill Gas
CoreSite - Somerville	Bloom Energy	Somerville, MA	30 GWh	Aug 2020	Dec 2023	Natural Gas
Berkshire Wind Power Project	Massachusetts Mun Wholes Electric Co	Lanesboro, MA	29 GWh	Apr 2011	Feb 2025	Wind
Deerfield 4	Great River Hydro, LLC	Buckland, MA	29 GWh	Jul 1912	Dec 2023	Water

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	742.1 GWh	4
#25	Dominion Energy South Carolina, Inc.	26.1 TWh	85
#13	Duke Energy Carolinas	111.3 TWh	556
#17	Duke Energy Progress East	65.3 TWh	554
#52	Duke Energy Progress West	4.2 TWh	10
#24	Louisville Gas and Electric Company and Kentucky Utilities Company	34.0 TWh	20
#12	New York Independent System Operator	130.9 TWh	1,100
#1	PJM Interconnection, LLC	859.4 TWh	2,305
#29	South Carolina Public Service Authority	19.3 TWh	33
#60	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	189.5 TWh	1,943
#8	Tennessee Valley Authority	158.9 TWh	170
#10	Florida Power & Light Co.	148.5 TWh	159
#12	New York Independent System Operator	130.9 TWh	1,100
#13	Duke Energy Carolinas	111.3 TWh	556
#15	ISO New England	103.6 TWh	1,487
#16	Bonneville Power Administration	83.0 TWh	158
#17	Duke Energy Progress East	65.3 TWh	554
#18	Salt River Project Agricultural Improvement and Power District	58.5 TWh	45
#19	PacifiCorp East	57.0 TWh	204