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	112.3 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 \| 54.2% Nuclear \| 25.2% Wind \| 5.6% Water \| 4.6% Other Fuel \| 4.4% 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
Shepaug	FirstLight Power Resources Services LLC	Southbury, CT	93 GWh	Dec 1954	Dec 2025	Water
Wheelabrator Concord Facility	Wheelabrator Environmental Systems	Concord, NH	93 GWh	Mar 1989	Jul 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Bridgeport Fuel Cell, LLC	Bridgeport Fuel Cell, LLC	Bridgeport, CT	90 GWh	Nov 2013	Dec 2025	Natural Gas
Saddleback Ridge Wind Farm	CPV Saddleback Ridge Wind, LLC	Carthage, ME	90 GWh	Nov 2014	Dec 2025	Wind
Sanford Solar	Sanford Airport Solar, LLC	Sanford, ME	89 GWh	Oct 2020	Jul 2026	Solar
Dartmouth Power Associates LP	Dartmouth Energy Center	Dartmouth, MA	89 GWh	Feb 1992	Dec 2025	Natural Gas : 96.7% Distillate Fuel Oil : 3.3%
Smith (NH)	Central Rivers Power NH, LLC	Berlin, NH	87 GWh	Jul 1948	Dec 2025	Water
Regional Waste Systems	Ecomaine	Portland, ME	87 GWh	May 1988	Jul 2026	Non-biogenic Municipal Solid Waste : 54.6% Biogenic Municipal Solid Waste : 44.7% Natural Gas : 0.7%
Middletown	Middletown Power LLC	Middletown, CT	87 GWh	Sep 1958	Dec 2025	Residual Fuel Oil : 99.9%
Block Island Wind Farm	Deepwater Wind Block Island LLC	NA, RI	81 GWh	Nov 2016	Jul 2026	Wind
Central Heating Plant	University of Massachusetts Amherst	Amherst, MA	80 GWh	Sep 2007	Dec 2025	Natural Gas : 96.3% Distillate Fuel Oil : 3.7%
Pfizer Groton Plant	Pfizer Inc	Groton, CT	79 GWh	Dec 1947	Jul 2026	Natural Gas : 89.1% Distillate Fuel Oil : 10.9%
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%
Antrim Wind	Antrim Wind Energy LLC	Antrim, NH	79 GWh	Nov 2019	Jul 2026	Wind
NE Renewable Tamworth, LLC	NE Renewable Tamworth, LLC	Tamworth, NH	78 GWh	Nov 1987	Dec 2025	Wood/Wood Waste Solids
Skelton	Brookfield White Pine Hydro LLC	Dayton, ME	77 GWh	Dec 1947	Dec 2025	Water
New England Wind LLC	Avangrid Power LLC	Florida, MA	76 GWh	Nov 2012	Jul 2026	Wind
Quinebaug Solar	Quinebaug Solar, LLC	Canterbury, CT	76 GWh	Nov 2021	Jul 2026	Solar
Worumbo Hydro Station	Eagle Creek Renewable Energy, LLC	Lisbon Falls, ME	74 GWh	Jan 1989	Dec 2025	Water
NE Renewable Springfield, LLC	NE Renewable Springfield, LLC	Springfield, NH	73 GWh	Nov 1987	Dec 2025	Wood/Wood Waste Solids
Generate Colchester Fuel Cells, LLC	Generate Colchester Fuel Cells, LLC	Colchester, CT	72 GWh	Sep 2021	Dec 2025	Natural Gas
Stevenson	FirstLight Power Resources Services LLC	Monroe, CT	71 GWh	Dec 1918	Dec 2025	Water
Robin Hollow Solar	Robin Hollow Solar, LLC	West Greenwich, RI	71 GWh	Nov 2023	Jul 2026	Solar
West Enfield Hydro	Brookfield Black Bear Hydro, LLC	West Enfield, ME	70 GWh	Mar 1988	Dec 2025	Water
Brunswick Hydro	Brookfield White Pine Hydro LLC	Brunswick, ME	70 GWh	Feb 1982	Dec 2025	Water
Bull Hill Wind Project	Evergreen Wind, LLC	Eastbrook, ME	66 GWh	Sep 2012	Dec 2025	Wind
Sikorsky Aircraft CHP	Sikorsky Aircraft Corporation	Stratford, CT	65 GWh	May 2010	Dec 2025	Natural Gas : 99.9%
Amoskeag	Central Rivers Power NH, LLC	Manchester, NH	65 GWh	Jul 1922	Dec 2025	Water
Silver Maple	WEB Silver Maple Wind LLC	Clifton, ME	64 GWh	Sep 2022	Dec 2025	Wind
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	64 GWh	Jun 1990	Jul 2026	Natural Gas : 93.3% Distillate Fuel Oil : 6.7%
Williams Hydro	Brookfield White Pine Hydro LLC	Solon, ME	64 GWh	Dec 1938	Dec 2025	Water
Univ of Massachusetts Medical Center	University of Massachusetts Medical	Worcester, MA	63 GWh	Mar 1974	Dec 2025	Natural Gas : 99.3% Distillate Fuel Oil : 0.6%
Dry Bridge Solar (Brown University)	MN8 Energy LLC	North Kingstown, RI	63 GWh	Oct 2023	Jul 2026	Solar
Lempster Wind LLC	Avangrid Power LLC	Lempster, NH	62 GWh	Nov 2008	Jul 2026	Wind
Boott Hydropower	Boott Hydro, LLC - Hybrid	Lowell, MA	61 GWh	Sep 1985	Dec 2025	Water
Gillette SBMC	The Gillette Company	Boston, MA	59 GWh	Jan 1971	Jul 2026	Natural Gas
NE Renewable Whitefield, LLC	NE Renewable Whitefield, LLC	Whitefield, NH	59 GWh	Feb 1988	Dec 2025	Wood/Wood Waste Solids
Lawrence Hydroelectric Associates	Central Rivers Power US, LLC	Lawrence, MA	59 GWh	Jun 1981	Dec 2025	Water
Coventry Clean Energy Corporation	Washington Electric Coop - (VT)	Coventry, VT	57 GWh	Jun 2005	Dec 2025	Landfill Gas
Sheffield Wind	Evergreen Wind, LLC	Sheffield, VT	57 GWh	Sep 2011	Jul 2026	Wind
Weston Hydro	Brookfield White Pine Hydro LLC	Skowhegan, ME	57 GWh	Dec 1919	Dec 2025	Water
Canton Mountain Wind	CPV Canton Mountain Wind LLC	Canton, ME	56 GWh	Oct 2017	Dec 2025	Wind
Athens Energy	Athens Energy, LLC	Athens, ME	56 GWh	Sep 2016	Dec 2025	Wood/Wood Waste Solids
Stetson Wind II	Evergreen Wind, LLC	Danforth, ME	55 GWh	Feb 2010	Dec 2025	Wind
Waterbury Generation	Engie North America	Waterbury, CT	55 GWh	May 2009	Dec 2025	Natural Gas : 99.1% Kerosene : 0.9%
Cleary Flood Hybrid	City of Taunton - (MA)	Taunton, MA	54 GWh	May 1966	Dec 2025	Natural Gas : 94.0% Distillate Fuel Oil : 6.0%
Spruce Mountain WInd	CPV Spruce Mountain Wind LLC	Bryant Pond, ME	53 GWh	Nov 2011	Dec 2025	Wind
Sheldon Springs Hydroelectric	Central Rivers Power US, LLC	Sheldon Springs, VT	52 GWh	Jun 1988	Dec 2025	Water
UNH 7.9 MW Plant	Emcor Energy Services	Durham, NH	51 GWh	Aug 2006	Jul 2026	Landfill Gas : 52.2% Natural Gas : 45.1% Distillate Fuel Oil : 2.7%
Pontook Hydro Facility	Pontook Operating LP	Dummer, NH	51 GWh	Nov 1986	Dec 2025	Water
Georges River Energy	Robbins Lumber Inc	Searsmont, ME	51 GWh	Nov 2018	Dec 2025	Wood/Wood Waste Solids
Deer Rips	Brookfield White Pine Hydro LLC	Auburn, ME	51 GWh	Dec 1902	Dec 2025	Water
Pejepscot Hydroelectric Project	Topsham Hydro Partners	Topsham, ME	50 GWh	Oct 1987	Dec 2025	Water
Hartford Hospital Cogeneration	Cartier Energy, LLC	Hartford, CT	49 GWh	Jun 1988	Dec 2025	Natural Gas
DWW Solar ll	DWW Solar ll LLC	Simsbury, CT	47 GWh	Nov 2019	Jul 2026	Solar
Deerfield 5	Great River Hydro, LLC	Florida, MA	44 GWh	Sep 1974	Dec 2025	Water
RoxWind	RoxWind LLC	Roxbury, ME	44 GWh	Oct 2021	Dec 2025	Wind
NE Renewable Power West Enfield	Stored Solar J&WE	West Enfield, ME	43 GWh	Nov 1987	Dec 2025	Wood/Wood Waste Solids
Erving Paper Mills	Erving Paper Mills Inc	Erving, MA	42 GWh	Nov 2013	Jul 2026	Natural Gas : 98.0% Distillate Fuel Oil : 2.0%
Potter Station 2	Town of Braintree - (MA)	Braintree, MA	41 GWh	Jun 1963	Dec 2025	Natural Gas : 61.2% Distillate Fuel Oil : 38.8%
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	41 GWh	Dec 1984	Jul 2026	Water
Rhode Island Hospital	Rhode Island Hospital	Providence, RI	40 GWh	Sep 1974	Jul 2026	Natural Gas : 83.2% Residual Fuel Oil : 16.8%
Mcindoes	Great River Hydro, LLC	Barnet, VT	39 GWh	Dec 1930	Dec 2025	Water
Turnkey Landfill Gas Recovery	WM Renewable Energy LLC	Rochester, NH	39 GWh	Jan 1992	Dec 2025	Landfill Gas
Fusion Solar Center LLC	Fusion Solar Centre, L.L.C	Baltic, CT	38 GWh	Feb 2018	Jul 2026	Solar
South Windsor Fuel Cell	South Energy Investments LLC	South Windsor, CT	37 GWh	Feb 2020	Dec 2025	Natural Gas
Hydro Kennebec Project	Hydro Kennebec LLC	Winslow, ME	37 GWh	Dec 1988	Nov 2025	Water
Essex Junction 19	Green Mountain Power Corp	Essex Junction, VT	36 GWh	Dec 1916	Jul 2026	Water : 99.0% Distillate Fuel Oil : 1.0%
Ayers Island	Central Rivers Power NH, LLC	Bristol, NH	36 GWh	Jul 1925	Dec 2025	Water
Pfizer Groton Fuel Cell	Groton Fuel Cell 1 LLC	Groton, CT	36 GWh	Sep 2016	Dec 2025	Natural Gas
Milford Hydro Station	Brookfield Black Bear Hydro, LLC	Milford, ME	36 GWh	Jun 1941	Dec 2025	Water
Walden Solar Maine V	Walden Solar Maine V LLC	Leeds, ME	36 GWh	Nov 2024	Dec 2025	Solar
Nutmeg Solar	Nutmeg Solar LLC	Enfield, CT	35 GWh	Nov 2020	Dec 2025	Solar
Milton	Green Mountain Power Corp	Milton, VT	34 GWh	Jan 1929	Dec 2025	Water
Highgate Falls	Village of Swanton - (VT)	Highgate, VT	32 GWh	Jul 1923	Dec 2025	Water
Deer Island Treatment Plant	Massachusetts Wtr Rauth-Deer I	Winthrop, MA	32 GWh	Jul 1995	Jul 2026	Other Biomass Gas : 81.7% Distillate Fuel Oil : 13.7% Wind : 2.8% Solar : 1.8%
Merrimack	Granite Shore Power	Bow, NH	32 GWh	Nov 1960	Jul 2026	Bituminous Coal : 92.8% Jet Fuel : 7.1%
North Stonington Solar Center, LLC	Adapture Renewables, Inc.	North Stonington, CT	32 GWh	Sep 2022	Dec 2025	Solar
Fitchburg Gas Recovery	WM Renewable Energy LLC	Westminster, MA	32 GWh	Sep 2007	Dec 2025	Landfill Gas
Hiram	Brookfield White Pine Hydro LLC	Hiram, ME	31 GWh	Dec 1916	Dec 2025	Water
Bonny Eagle	Brookfield White Pine Hydro LLC	Hollis, ME	31 GWh	Dec 1909	Dec 2025	Water
GD West Greenwich Nooseneck I, LLC	GD West Greenwich Nooseneck I, LLC	West Greenwich, RI	31 GWh	Nov 2022	Dec 2025	Solar
Naval Sub Base New London Fuel Cell	Groton Station Fuel Cell, LLC	Groton, CT	30 GWh	Nov 2022	Dec 2025	Natural Gas
Aziscohos Hydroelectric Project	Brookfield White Pine Hydro LLC	Wilson Mills, ME	30 GWh	May 1988	Dec 2025	Water
Subase Microgrid Project	Connecticut Mun Elec Engy Coop	Groton, CT	30 GWh	Nov 2022	Dec 2025	Natural Gas
Deerfield 2	Great River Hydro, LLC	Conway, MA	29 GWh	Jul 1913	Dec 2025	Water
University Solar, LLC	AES Distributed Energy	West Greenwich, RI	29 GWh	Nov 2019	Jul 2026	Solar
Norton Powerhouse 2	Norton Powerhouse 2	Worcester, MA	29 GWh	Oct 2022	Dec 2025	Natural Gas
Pisgah Mountain Wind	Pisgah Mountain, LLC	Clifton, ME	28 GWh	Nov 2016	Dec 2025	Wind
Hampton Facility	Foss Manufacturing Company LLC	Hampton, NH	28 GWh	Sep 1978	Jul 2026	Natural Gas
Sherman	Great River Hydro, LLC	Rowe, MA	28 GWh	Nov 1926	Dec 2025	Water
CoreSite - Somerville	Bloom Energy	Somerville, MA	28 GWh	Aug 2020	Dec 2025	Natural Gas
Proctor	Green Mountain Power Corp	Proctor, VT	28 GWh	Jul 1905	Dec 2025	Water
HSCo CHP	Cartier Energy, LLC	Hartford, CT	28 GWh	Sep 2009	Dec 2025	Natural Gas
Berkshire Wind Power Project	Massachusetts Mun Wholes Electric Co	Lanesboro, MA	28 GWh	Apr 2011	Jul 2026	Wind
Gold Meadow Farms	Captona Lippitt Ave Cranston LLC	Cranston, RI	27 GWh	Apr 2019	Dec 2025	Solar
Bulls Bridge	FirstLight Power Resources Services LLC	New Milford, CT	27 GWh	Dec 1902	Dec 2025	Water
Deerfield 3	Great River Hydro, LLC	Buckland, MA	26 GWh	Jul 1912	Dec 2025	Water
SR Litchfield	SR Litchfield, LLC	Litchfield, CT	26 GWh	Jan 2025	Dec 2025	Solar
Eastern Maine Medical Center	Eastern Maine Medical Center	Bangor, ME	26 GWh	Sep 2006	Jul 2026	Natural Gas

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	433.1 GWh	4
#24	Dominion Energy South Carolina, Inc.	26.0 TWh	83
#13	Duke Energy Carolinas	113.6 TWh	578
#17	Duke Energy Progress East	66.1 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	134.2 TWh	1,334
#1	PJM Interconnection, LLC	891.7 TWh	2,806
#28	South Carolina Public Service Authority	19.7 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	167.6 TWh	2,170
#9	Tennessee Valley Authority	166.3 TWh	209
#10	Florida Power & Light Co.	152.8 TWh	188
#12	New York Independent System Operator	134.2 TWh	1,334
#13	Duke Energy Carolinas	113.6 TWh	578
#15	ISO New England	112.3 TWh	1,667
#16	Bonneville Power Administration	91.2 TWh	170
#17	Duke Energy Progress East	66.1 TWh	574
#18	PacifiCorp East	61.3 TWh	223
#19	Salt River Project Agricultural Improvement and Power District	60.3 TWh	51