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
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%
Granite Reliable Power	NexteraEnergy	Dummer, NH	199 GWh	Jan 2012	Jul 2026	Wind
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	3 TWh	Apr 2001	Jul 2026	Natural Gas
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%
Jericho Power	Jericho Power LLC	Berlin, NH	23 GWh	Dec 2015	Jul 2026	Wind
West Greenwich Solar	RWE Clean Energy	West Greenwich, RI	2 GWh	Apr 2013	Jul 2026	Solar
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	401 GWh	Dec 1989	Jul 2026	Black Liquor : 54.2% Tire-derived Fuels : 20.8% Wood/Wood Waste Solids : 16.7% Bituminous Coal : 6.0% Residual Fuel Oil : 1.1% Natural Gas : 0.6% Sludge Waste : 0.6%
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	3 TWh	May 1998	Jul 2026	Natural Gas
Central Power Plant	State of Rhode Island	Cranston, RI	15 GWh	Jul 1958	Jul 2026	Natural Gas : 98.5% Distillate Fuel Oil : 1.5%
Rainbow (CT)	Farmington River Power Company	Windsor, CT	19 GWh	Nov 1925	Jul 2026	Water
Groton Wind LLC	Avangrid Power LLC	Groton, NH	104 GWh	Nov 2012	Jul 2026	Wind
Antrim Wind	Antrim Wind Energy LLC	Antrim, NH	79 GWh	Nov 2019	Jul 2026	Wind
Hampton Facility	Foss Manufacturing Company LLC	Hampton, NH	28 GWh	Sep 1978	Jul 2026	Natural Gas
Millstone	Dominion Energy Nuclear Conn Inc	Waterford, CT	17 TWh	Nov 1975	Jul 2026	Nuclear
Bridgeport Station	Generation Bridge II Connecticut, LLC	Bridgeport, CT	3 TWh	Jul 1961	Jul 2026	Natural Gas : 84.6% Distillate Fuel Oil : 15.4%
Pfizer Groton Plant	Pfizer Inc	Groton, CT	79 GWh	Dec 1947	Jul 2026	Natural Gas : 89.1% Distillate Fuel Oil : 10.9%
J C McNeil	City of Burlington Electric - (VT)	Burlington, VT	189 GWh	May 1984	Jul 2026	Wood/Wood Waste Solids : 99.6%
New England Wind LLC	Avangrid Power LLC	Florida, MA	76 GWh	Nov 2012	Jul 2026	Wind
Sheffield Wind	Evergreen Wind, LLC	Sheffield, VT	57 GWh	Sep 2011	Jul 2026	Wind
CPV Towantic Energy Center	CPV Towantic, LLC	Oxford, CT	6 TWh	Apr 2018	Jul 2026	Natural Gas
Gillette SBMC	The Gillette Company	Boston, MA	59 GWh	Jan 1971	Jul 2026	Natural Gas
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	41 GWh	Dec 1984	Jul 2026	Water
Cape Cod Air Force Station - 6 SWS	US Space Force	Sagamore, MA	6 GWh	Dec 2013	Jul 2026	Wind
Georgia Mountain Community Wind Farm	Greenbacker Renewable Energy Corporation	Milton, VT	25 GWh	Nov 2012	Jul 2026	Wind
UCONN Cogen Facility	University of Connecticut	Storrs, CT	111 GWh	Feb 2006	Jul 2026	Natural Gas : 95.1% Distillate Fuel Oil : 4.9%
Passadumkeag Windpark LLC	Southern Power Co	Greenbush, ME	135 GWh	Jun 2016	Jul 2026	Wind
Spring Hill Road	AES Distributed Energy	Barre, MA	306 MWh	Nov 2015	Jul 2026	Solar
NBC Field's Point Wind Farm	Narragansett Bay Commission	Providence, RI	7 GWh	Sep 2012	Jul 2026	Wind
Dept of Corrections NCCI Wind	Dept of Corrections NCCI Wind	Gardner, MA	2 GWh	Oct 2013	Jul 2026	Wind
Eastern Maine Medical Center	Eastern Maine Medical Center	Bangor, ME	26 GWh	Sep 2006	Jul 2026	Natural Gas
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	64 GWh	Jun 1990	Jul 2026	Natural Gas : 93.3% Distillate Fuel Oil : 6.7%
General Electric Aircraft Engines	General Electric Aircraft Engines	Lynn, MA	2 GWh	Dec 1947	Jul 2026	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%
Wheelabrator North Andover	Wheelabrator Environmental Systems	North Andover, MA	247 GWh	Apr 1985	Jul 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
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%
Algonquin Windsor Locks	Ahlstrom Power Windsor Locks LLC	Windsor Locks, CT	145 GWh	Dec 1989	Jul 2026	Natural Gas : 92.1% Distillate Fuel Oil : 7.9%
Milford Power Project	Milford Power Co LLC	Milford, CT	3 TWh	Jan 2004	Jul 2026	Natural Gas
William F Wyman Hybrid	FPL Energy Wyman LLC	Yarmouth, ME	323 GWh	Dec 1956	Jul 2026	Residual Fuel Oil : 99.6%
Millennium Power	Millennium Power Company, LLC	Charlton, MA	880 GWh	Mar 2001	Jul 2026	Natural Gas
Rhode Island Hospital	Rhode Island Hospital	Providence, RI	40 GWh	Sep 1974	Jul 2026	Natural Gas : 83.2% Residual Fuel Oil : 16.8%
Fore River Generating Station	Calpine Fore River Energy Center, LLC	North Weymouth, MA	3 TWh	Jul 2003	Jul 2026	Natural Gas : 92.0% Distillate Fuel Oil : 8.0%
Kibby Wind Facility	Helix Maine Wind Development, LLC	Chain of Ponds, ME	245 GWh	Sep 2009	Jul 2026	Wind
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	3 TWh	May 2001	Jul 2026	Natural Gas
Dartmouth College Heating Plant	Dartmouth College	Hanover, NH	10 GWh	Dec 1969	Jul 2026	Residual Fuel Oil
Kendall Square Station	Kendall Green Energy, LLC	Cambridge, MA	1 TWh	May 1949	Jul 2026	Natural Gas : 97.3% Distillate Fuel Oil : 2.7%
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	Jul 2026	Nuclear
Canal	Canal Generating LLC	Sandwich, MA	467 GWh	May 1968	Jul 2026	Residual Fuel Oil : 59.3% Natural Gas : 28.9% Distillate Fuel Oil : 11.7%
Berkshire Wind Power Project	Massachusetts Mun Wholes Electric Co	Lanesboro, MA	28 GWh	Apr 2011	Jul 2026	Wind
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	132 GWh	Mar 2005	Jul 2026	Natural Gas
Frito Lay Incorporated	Frito Lay Incorporated Dayville	Dayville, CT	25 GWh	Feb 2009	Jul 2026	Natural Gas
Cottage Street Solar Facility	Western Massachusetts Electric Company	Springfield, MA	4 GWh	Apr 2014	Jul 2026	Solar
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%
Mt Wachusett Community College	Mt Wachusett Community College	Gardner, MA	5 GWh	Feb 2011	Jul 2026	Wind
WED Coventry 6	Greenbacker Renewable Energy Corporation	Coventry, RI	8 GWh	Jul 2016	Jul 2026	Wind
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	170 GWh	Apr 2013	Jul 2026	Landfill Gas
Fusion Solar Center LLC	Fusion Solar Centre, L.L.C	Baltic, CT	38 GWh	Feb 2018	Jul 2026	Solar
Antares-GRE 314 East Lyme LLC	MN8 Energy LLC	East Lyme, CT	4 GWh	May 2014	Jul 2026	Solar
Exelon West Medway II LLC	Constellation Power, Inc	Medway, MA	231 GWh	Feb 2019	Jul 2026	Natural Gas : 94.7% Kerosene : 5.3%
Stony Brook	Massachusetts Mun Wholes Electric Co	Ludlow, MA	133 GWh	Oct 1981	Jul 2026	Distillate Fuel Oil : 73.3% Natural Gas : 26.7%
Framingham State University Plant	Framingham State University	Framingham, MA	48 MWh	May 1974	Jul 2026	Solar : 62.5% Distillate Fuel Oil : 37.5%
Backus Microgrid Project	Connecticut Mun Elec Engy Coop	Norwich, CT	828 MWh	Jul 2014	Jul 2026	Distillate Fuel Oil
Hancock Wind Plant	Onward Energy	T22 MD, ME	115 GWh	Nov 2016	Jul 2026	Wind
Indian Orchard Plant 1	Solutia Inc-Indian	Springfield, MA	10 GWh	Apr 1985	Jul 2026	Natural Gas
Newington	Granite Shore Power	Newington, NH	136 GWh	May 1974	Jul 2026	Residual Fuel Oil : 73.7% Natural Gas : 24.7% Distillate Fuel Oil : 1.6%
Pepperell Hydro Power Plant	Eagle Creek Renewable Energy, LLC	Pepperell, MA	2 GWh	Dec 1919	Jul 2026	Water
Blackstone/Tupperware	Blackstone Hydro Inc.	North Smithfield, RI	2 GWh	Dec 1980	Jul 2026	Water
MMWAC Resource Recovery Facility	Maine Waste to Energy	Auburn, ME	7 GWh	May 1992	Jul 2026	Non-biogenic Municipal Solid Waste : 54.0% Biogenic Municipal Solid Waste : 44.2% Natural Gas : 1.9%
Covanta Southeastern Connecticut Company	Covanta Southeastern Connecticut Company	Preston, CT	106 GWh	Nov 1991	Jul 2026	Non-biogenic Municipal Solid Waste : 53.8% Biogenic Municipal Solid Waste : 44.0% Distillate Fuel Oil : 2.2%
Searsburg Wind Turbine	Green Mountain Power Corp	Searsburg, VT	10 GWh	May 1997	Jul 2026	Wind
Bucksport Generation LLC	Bucksport Generation LLC	Bucksport, ME	26 GWh	Jun 1965	Jul 2026	Natural Gas : 53.6% Distillate Fuel Oil : 46.4%
New Haven Steam	Generation Bridge II Connecticut, LLC	New Haven, CT	141 GWh	Jun 1975	Jul 2026	Residual Fuel Oil : 53.7% Natural Gas : 31.8% Distillate Fuel Oil : 12.3% Kerosene : 2.3%
Covanta Haverhill	Ogden Projects Inc-Haverhill	Haverhill, MA	291 GWh	Apr 1989	Jul 2026	Non-biogenic Municipal Solid Waste : 52.8% Biogenic Municipal Solid Waste : 43.2% Distillate Fuel Oil : 4.0%
Merrimack	Granite Shore Power	Bow, NH	32 GWh	Nov 1960	Jul 2026	Bituminous Coal : 92.8% Jet Fuel : 7.1%
Schiller	Granite Shore Power	Portsmouth, NH	561 MWh	Sep 1952	Jul 2026	Jet Fuel
Covanta Bristol Energy	Covanta Bristol Inc	Bristol, CT	108 GWh	Nov 1987	Jul 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
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%
Manchester Street	Manchester Street, LLC.	Providence, RI	2 TWh	Aug 1995	Jul 2026	Natural Gas : 92.5% Distillate Fuel Oil : 7.5%
Ascutney	Green Mountain Power Corp	Weatherfield, VT	406 MWh	Jul 1961	Jul 2026	Distillate Fuel Oil
Erving Paper Mills	Erving Paper Mills Inc	Erving, MA	42 GWh	Nov 2013	Jul 2026	Natural Gas : 98.0% Distillate Fuel Oil : 2.0%
Wheelabrator Bridgeport	Wheelabrator Environmental Systems	Bridgeport, CT	429 GWh	Jun 1988	Jul 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Wheelabrator Lisbon	Wheelabrator Environmental Systems	Lisbon, CT	101 GWh	Sep 1995	Jul 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	Jul 2026	Natural Gas
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Jul 2026	Natural Gas
Pratt & Whitney	United Technologies	East Hartford, CT	96 GWh	Dec 1991	Jul 2026	Natural Gas
Wheelabrator Saugus	Wheelabrator Environmental Systems	Saugus, MA	182 GWh	Jul 1985	Jul 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Lempster Wind LLC	Avangrid Power LLC	Lempster, NH	62 GWh	Nov 2008	Jul 2026	Wind
Newington Energy Center	Essential Power Operating Services, LLC	Newington, NH	2 TWh	Sep 2002	Jul 2026	Natural Gas : 92.9% Distillate Fuel Oil : 7.1%
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	Jul 2026	Natural Gas
Oakfield Wind Project	Onward Energy	City of Oakfield, ME	330 GWh	Sep 2015	Jul 2026	Wind
Kleen Energy Systems	Kleen Energy Systems, LLC	Middletown, CT	4 TWh	Jun 2011	Jul 2026	Natural Gas : 98.0% Distillate Fuel Oil : 2.0%
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	4 TWh	Feb 2003	Jul 2026	Natural Gas
Berlin 5	Green Mountain Power Corp	Berlin, VT	1 GWh	May 1972	Jul 2026	Kerosene
Wheelabrator Millbury Facility	Wheelabrator Environmental Systems	Millbury, MA	288 GWh	Aug 1987	Jul 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Essex Junction 19	Green Mountain Power Corp	Essex Junction, VT	36 GWh	Dec 1916	Jul 2026	Water : 99.0% Distillate Fuel Oil : 1.0%
Kingdom Community Wind	Green Mountain Power Corp	Lowell, VT	168 GWh	Oct 2012	Jul 2026	Wind
Water Treatment 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	394 MWh	Sep 2010	Jul 2026	Distillate Fuel Oil
Cellu Tissue	Dunn Paper East Hartford, LLC	East Hartford, CT	11 GWh	Apr 2009	Jul 2026	Natural Gas
Block Island Wind Farm	Deepwater Wind Block Island LLC	NA, RI	81 GWh	Nov 2016	Jul 2026	Wind
Fort Hill 1, 2, 3 & 4	Connecticut Mun Elec Engy Coop	Uncasville, CT	653 MWh	Jul 2010	Jul 2026	Distillate Fuel Oil
Bingham Wind	Onward Energy	Bingham, ME	475 GWh	Nov 2016	Jul 2026	Wind

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