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
Deerfield Wind LLC	Avangrid Power LLC	Searsburg, VT	95 GWh	Nov 2017	Sep 2025	Wind
Bridgewater Power LP	Bridgewater Power Co LP	Bridgewater, NH	93 GWh	Jul 1987	Dec 2024	Wood/Wood Waste Solids : 99.5%
New Haven Harbor	Generation Bridge II Connecticut, LLC	New Haven, CT	93 GWh	Jun 1975	Sep 2025	Natural Gas : 72.8% Residual Fuel Oil : 17.4% Distillate Fuel Oil : 6.4% Kerosene : 3.3%
Harriman	Great River Hydro, LLC	Whitingham, VT	91 GWh	Apr 1924	Dec 2024	Water
Regional Waste Systems	Ecomaine	Portland, ME	90 GWh	May 1988	Sep 2025	Non-biogenic Municipal Solid Waste : 54.6% Biogenic Municipal Solid Waste : 44.7% Natural Gas : 0.7%
Worumbo Hydro Station	Eagle Creek Renewable Energy, LLC	Lisbon Falls, ME	89 GWh	Jan 1989	Dec 2024	Water
Brunswick Hydro	Brookfield White Pine Hydro LLC	Brunswick, ME	88 GWh	Feb 1982	Dec 2024	Water
Sanford Solar	Sanford Airport Solar, LLC	Sanford, ME	88 GWh	Oct 2020	Sep 2025	Solar
Wallingford Energy	Wallingford Energy LLC	Wallingford, CT	88 GWh	Jul 2001	Dec 2024	Natural Gas
Block Island Wind Farm	Deepwater Wind Block Island LLC	NA, RI	85 GWh	Nov 2016	Sep 2025	Wind
Saddleback Ridge Wind Farm	CPV Saddleback Ridge Wind, LLC	Carthage, ME	83 GWh	Nov 2014	Dec 2024	Wind
Pratt & Whitney	United Technologies	East Hartford, CT	82 GWh	Dec 1991	Sep 2025	Natural Gas
Quinebaug Solar	Quinebaug Solar, LLC	Canterbury, CT	81 GWh	Nov 2021	Sep 2025	Solar
Williams Hydro	Brookfield White Pine Hydro LLC	Solon, ME	80 GWh	Dec 1938	Dec 2024	Water
Pfizer Groton Plant	Pfizer Inc	Groton, CT	78 GWh	Dec 1947	Sep 2025	Natural Gas : 91.4% Distillate Fuel Oil : 8.6%
West Enfield Hydro	Brookfield Black Bear Hydro, LLC	West Enfield, ME	77 GWh	Mar 1988	Dec 2024	Water
Amoskeag	Central Rivers Power NH, LLC	Manchester, NH	77 GWh	Jul 1922	Dec 2024	Water
Generate Colchester Fuel Cells, LLC	Generate Colchester Fuel Cells, LLC	Colchester, CT	77 GWh	Sep 2021	Dec 2024	Natural Gas
Antrim Wind	Antrim Wind Energy LLC	Antrim, NH	75 GWh	Nov 2019	Sep 2025	Wind
New England Wind LLC	Avangrid Power LLC	Florida, MA	75 GWh	Nov 2012	Sep 2025	Wind
Bull Hill Wind Project	Evergreen Wind, LLC	Eastbrook, ME	74 GWh	Sep 2012	Dec 2024	Wind
Sheffield Wind	Evergreen Wind, LLC	Sheffield, VT	73 GWh	Sep 2011	Sep 2025	Wind
Robin Hollow Solar	Robin Hollow Solar, LLC	West Greenwich, RI	70 GWh	Nov 2023	Sep 2025	Solar
Univ of Massachusetts Medical Center	University of Massachusetts Medical	Worcester, MA	69 GWh	Mar 1974	Dec 2024	Natural Gas : 99.2% Distillate Fuel Oil : 0.7%
Dry Bridge Solar (Brown University)	MN8 Energy LLC	North Kingstown, RI	69 GWh	Oct 2023	Sep 2025	Solar
Sheldon Springs Hydroelectric	Central Rivers Power US, LLC	Sheldon Springs, VT	68 GWh	Jun 1988	Dec 2024	Water
Lempster Wind LLC	Avangrid Power LLC	Lempster, NH	68 GWh	Nov 2008	Sep 2025	Wind
William F Wyman Hybrid	FPL Energy Wyman LLC	Yarmouth, ME	66 GWh	Dec 1956	Sep 2025	Residual Fuel Oil : 99.2% Distillate Fuel Oil : 0.8%
Lawrence Hydroelectric Associates	Central Rivers Power US, LLC	Lawrence, MA	65 GWh	Jun 1981	Dec 2024	Water
Dartmouth Power Associates LP	Morris Energy Operations Company, LLC	Dartmouth, MA	63 GWh	Feb 1992	Dec 2024	Natural Gas : 99.7%
Pontook Hydro Facility	Pontook Operating LP	Dummer, NH	62 GWh	Nov 1986	Dec 2024	Water
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%
Silver Maple	WEB Silver Maple Wind LLC	Clifton, ME	59 GWh	Sep 2022	Dec 2024	Wind
Athens Energy	Athens Energy, LLC	Athens, ME	58 GWh	Sep 2016	Dec 2024	Wood/Wood Waste Solids
Deer Rips	Brookfield White Pine Hydro LLC	Auburn, ME	58 GWh	Dec 1902	Dec 2024	Water
Skelton	Brookfield White Pine Hydro LLC	Dayton, ME	58 GWh	Dec 1947	Dec 2024	Water
Weston Hydro	Brookfield White Pine Hydro LLC	Skowhegan, ME	57 GWh	Dec 1919	Dec 2024	Water
UNH 7.9 MW Plant	Emcor Energy Services	Durham, NH	55 GWh	Aug 2006	Sep 2025	Landfill Gas : 73.7% Natural Gas : 25.4% Distillate Fuel Oil : 0.9%
Gillette SBMC	The Gillette Company	Boston, MA	55 GWh	Jan 1971	Sep 2025	Natural Gas
NE Renewable Whitefield, LLC	NE Renewable Whitefield, LLC	Whitefield, NH	54 GWh	Feb 1988	Dec 2024	Wood/Wood Waste Solids
Spruce Mountain WInd	CPV Spruce Mountain Wind LLC	Bryant Pond, ME	54 GWh	Nov 2011	Dec 2024	Wind
Mcindoes	Great River Hydro, LLC	Barnet, VT	53 GWh	Dec 1930	Dec 2024	Water
Sikorsky Aircraft CHP	Sikorsky Aircraft Corporation	Stratford, CT	53 GWh	May 2010	Dec 2024	Natural Gas : 99.8%
Georges River Energy	Robbins Lumber Inc	Searsmont, ME	52 GWh	Nov 2018	Dec 2024	Wood/Wood Waste Solids
DWW Solar ll	DWW Solar ll LLC	Simsbury, CT	52 GWh	Nov 2019	Sep 2025	Solar
Indeck West Enfield Energy Center	Stored Solar J&WE	West Enfield, ME	51 GWh	Nov 1987	Dec 2024	Wood/Wood Waste Solids : 99.9%
Canton Mountain Wind	CPV Canton Mountain Wind LLC	Canton, ME	51 GWh	Oct 2017	Dec 2024	Wind
Stetson Wind II	Evergreen Wind, LLC	Danforth, ME	50 GWh	Feb 2010	Dec 2024	Wind
Coventry Clean Energy Corporation	Washington Electric Coop - (VT)	Coventry, VT	49 GWh	Jun 2005	Dec 2024	Landfill Gas
Pejepscot Hydroelectric Project	Topsham Hydro Partners	Topsham, ME	49 GWh	Oct 1987	Dec 2024	Water
Highgate Falls	Village of Swanton - (VT)	Highgate, VT	47 GWh	Jul 1923	Dec 2024	Water
Milton	Green Mountain Power Corp	Milton, VT	44 GWh	Jan 1929	Dec 2024	Water
Turnkey Landfill Gas Recovery	WM Renewable Energy LLC	Rochester, NH	44 GWh	Jan 1992	Dec 2024	Landfill Gas
Waterbury Generation	Engie North America	Waterbury, CT	44 GWh	May 2009	Dec 2024	Natural Gas : 99.8%
Naval Sub Base New London Fuel Cell	Groton Station Fuel Cell, LLC	Groton, CT	44 GWh	Nov 2022	Dec 2024	Natural Gas
Subase Microgrid Project	Connecticut Mun Elec Engy Coop	Groton, CT	43 GWh	Nov 2022	Dec 2024	Natural Gas
Deerfield 5	Great River Hydro, LLC	Florida, MA	42 GWh	Sep 1974	Dec 2024	Water
Erving Paper Mills	Erving Paper Mills Inc	Erving, MA	42 GWh	Nov 2013	Sep 2025	Natural Gas : 98.9% Distillate Fuel Oil : 1.1%
Fusion Solar Center LLC	Fusion Solar Centre, L.L.C	Baltic, CT	40 GWh	Feb 2018	Sep 2025	Solar
Hiram	Brookfield White Pine Hydro LLC	Hiram, ME	40 GWh	Dec 1916	Dec 2024	Water
Ayers Island	Central Rivers Power NH, LLC	Bristol, NH	40 GWh	Jul 1925	Dec 2024	Water
Hartford Hospital Cogeneration	Cartier Energy, LLC	Hartford, CT	39 GWh	Jun 1988	Dec 2024	Natural Gas
Berkshire Wind Power Project	Massachusetts Mun Wholes Electric Co	Lanesboro, MA	39 GWh	Apr 2011	Sep 2025	Wind
South Windsor Fuel Cell	South Energy Investments LLC	South Windsor, CT	39 GWh	Feb 2020	Dec 2024	Natural Gas
Riverside Holyoke	City of Holyoke Gas and Electric Dept.	Holyoke, MA	38 GWh	Dec 1905	Dec 2024	Water
Milford Hydro Station	Brookfield Black Bear Hydro, LLC	Milford, ME	37 GWh	Jun 1941	Dec 2024	Water
Aziscohos Hydroelectric Project	Brookfield White Pine Hydro LLC	Wilson Mills, ME	36 GWh	May 1988	Dec 2024	Water
RoxWind	RoxWind LLC	Roxbury, ME	36 GWh	Oct 2021	Dec 2024	Wind
Nutmeg Solar	Nutmeg Solar LLC	Enfield, CT	34 GWh	Nov 2020	Dec 2024	Solar
Deer Island Treatment Plant	Massachusetts Wtr Rauth-Deer I	Winthrop, MA	33 GWh	Jul 1995	Sep 2025	Other Biomass Gas : 83.9% Distillate Fuel Oil : 10.8% Wind : 2.6% Solar : 1.9% Water : 0.9%
GD West Greenwich Nooseneck I, LLC	GD West Greenwich Nooseneck I, LLC	West Greenwich, RI	33 GWh	Nov 2022	Dec 2024	Solar
NE Renewable Springfield, LLC	NE Renewable Springfield, LLC	Springfield, NH	33 GWh	Nov 1987	Dec 2024	Wood/Wood Waste Solids
Bonny Eagle	Brookfield White Pine Hydro LLC	Hollis, ME	33 GWh	Dec 1909	Dec 2024	Water
Middletown	Middletown Power LLC	Middletown, CT	33 GWh	Sep 1958	Dec 2024	Residual Fuel Oil : 60.6% Natural Gas : 39.3%
S D Warren Westbrook	Relevate Power Management LLC	Westbrook, ME	33 GWh	Dec 1902	Dec 2023	Water
Fitchburg Gas Recovery	WM Renewable Energy LLC	Westminster, MA	32 GWh	Sep 2007	Dec 2024	Landfill Gas
Essex Junction 19	Green Mountain Power Corp	Essex Junction, VT	32 GWh	Dec 1916	Sep 2025	Water : 99.6%
Peterson	Green Mountain Power Corp	Milton, VT	31 GWh	Jan 1948	Dec 2024	Water
Proctor	Green Mountain Power Corp	Proctor, VT	31 GWh	Jul 1905	Dec 2024	Water
Eastern Maine Medical Center	Eastern Maine Medical Center	Bangor, ME	31 GWh	Sep 2006	Sep 2025	Natural Gas
Garvins Falls	Central Rivers Power NH, LLC	Bow, NH	31 GWh	Jul 1925	Dec 2024	Water
Bulls Bridge	FirstLight Power Resources Services LLC	New Milford, CT	31 GWh	Dec 1902	Dec 2024	Water
Milo PV - BD Solar 1 LLC	BD Solar 1 LLC	Milo, ME	31 GWh	May 2021	Dec 2024	Solar
North Stonington Solar Center, LLC	Adapture Renewables, Inc.	North Stonington, CT	30 GWh	Sep 2022	Dec 2024	Solar
Falls Village	FirstLight Power Resources Services LLC	Falls Village, CT	30 GWh	Dec 1913	Dec 2024	Water
Pfizer Groton Fuel Cell	Groton Fuel Cell 1 LLC	Groton, CT	30 GWh	Sep 2016	Dec 2024	Natural Gas
Georgia Mountain Community Wind Farm	Greenbacker Renewable Energy Corporation	Milton, VT	30 GWh	Nov 2012	Sep 2025	Wind
Chace Mill Winooski One	City of Burlington Electric - (VT)	Winooski, VT	29 GWh	Mar 1993	Dec 2024	Water
Fife Brook	Bear Swamp Power Company LLC	Florida, MA	29 GWh	Sep 1974	Oct 2024	Water
Dodge Falls Associates	Dodge Falls Associates LP	Bath, NH	29 GWh	Nov 1990	Dec 2024	Water
Deerfield 2	Great River Hydro, LLC	Conway, MA	29 GWh	Jul 1913	Dec 2024	Water
Norton Powerhouse 2	Norton Powerhouse 2	Worcester, MA	29 GWh	Oct 2022	Dec 2024	Natural Gas
Cataract Hydro	Brookfield White Pine Hydro LLC	Saco, ME	28 GWh	Dec 1936	Dec 2024	Water
Danbury Hospital Cogen Plant	Danbury Hospital	Danbury, CT	28 GWh	Oct 2011	Dec 2024	Natural Gas
Gold Meadow Farms	Captona Lippitt Ave Cranston LLC	Cranston, RI	28 GWh	Apr 2019	Dec 2024	Solar
Montville Station	Montville Power LLC	Uncasville, CT	28 GWh	Dec 1953	Dec 2024	Natural Gas : 52.4% Residual Fuel Oil : 46.4% Distillate Fuel Oil : 1.2%
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	28 GWh	Dec 1984	Sep 2025	Water
Boott Hydropower	Boott Hydro, LLC - Hybrid	Lowell, MA	28 GWh	Sep 1985	Dec 2024	Water
HSCo CHP	Cartier Energy, LLC	Hartford, CT	27 GWh	Sep 2009	Dec 2024	Natural Gas
SJA Solar LLC-Solterra Monastery CSG	SJA Solar, LLC	Spencer, MA	27 GWh	Nov 2016	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