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
Exelon West Medway II LLC	Constellation Power, Inc	Medway, MA	171 GWh	Feb 2019	Sep 2025	Natural Gas : 97.7% Kerosene : 2.3%
Kingdom Community Wind	Green Mountain Power Corp	Lowell, VT	180 GWh	Oct 2012	Sep 2025	Wind
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	3 TWh	May 2001	Sep 2025	Natural Gas
Wheelabrator Concord Facility	Wheelabrator Environmental Systems	Concord, NH	95 GWh	Mar 1989	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Dept of Corrections NCCI Wind	Dept of Corrections NCCI Wind	Gardner, MA	6 GWh	Oct 2013	Sep 2025	Wind
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	135 GWh	Mar 2005	Sep 2025	Natural Gas
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	429 GWh	Dec 1989	Sep 2025	Black Liquor : 51.5% Tire-derived Fuels : 22.6% Wood/Wood Waste Solids : 14.3% Bituminous Coal : 7.6% Residual Fuel Oil : 3.2% Sludge Waste : 0.9%
Wheelabrator Lisbon	Wheelabrator Environmental Systems	Lisbon, CT	101 GWh	Sep 1995	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Somerset Plant	Sappi Fine Paper North America-Somerset	Skowhegan, ME	573 GWh	Dec 1975	Sep 2025	Black Liquor : 46.2% Wood/Wood Waste Solids : 38.4% Natural Gas : 6.9% Tire-derived Fuels : 5.1% Residual Fuel Oil : 2.5% Sludge Waste : 0.8%
Rainbow (CT)	Farmington River Power Company	Windsor, CT	20 GWh	Nov 1925	Sep 2025	Water
Cellu Tissue	Dunn Paper East Hartford, LLC	East Hartford, CT	11 GWh	Apr 2009	Sep 2025	Natural Gas
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	149 GWh	Apr 2013	Sep 2025	Landfill Gas
Berkshire Wind Power Project	Massachusetts Mun Wholes Electric Co	Lanesboro, MA	39 GWh	Apr 2011	Sep 2025	Wind
Hampton Facility	Foss Manufacturing Company LLC	Hampton, NH	24 GWh	Sep 1978	Sep 2025	Natural Gas
Millstone	Dominion Energy Nuclear Conn Inc	Waterford, CT	16 TWh	Nov 1975	Sep 2025	Nuclear
Bridgeport Station	Generation Bridge II Connecticut, LLC	Bridgeport, CT	4 TWh	Jul 1961	Sep 2025	Natural Gas : 98.6% Distillate Fuel Oil : 1.4%
New England Wind LLC	Avangrid Power LLC	Florida, MA	75 GWh	Nov 2012	Sep 2025	Wind
J C McNeil	City of Burlington Electric - (VT)	Burlington, VT	228 GWh	May 1984	Sep 2025	Wood/Wood Waste Solids : 99.9%
Erving Paper Mills	Erving Paper Mills Inc	Erving, MA	42 GWh	Nov 2013	Sep 2025	Natural Gas : 98.9% Distillate Fuel Oil : 1.1%
Sheffield Wind	Evergreen Wind, LLC	Sheffield, VT	73 GWh	Sep 2011	Sep 2025	Wind
Newington Energy Center	Essential Power Operating Services, LLC	Newington, NH	2 TWh	Sep 2002	Sep 2025	Natural Gas : 95.7% Distillate Fuel Oil : 4.3%
Rhode Island Hospital	Rhode Island Hospital	Providence, RI	8 GWh	Sep 1974	Sep 2025	Natural Gas : 86.8% Residual Fuel Oil : 13.2%
MMWAC Resource Recovery Facility	Maine Waste to Energy	Auburn, ME	10 GWh	May 1992	Sep 2025	Non-biogenic Municipal Solid Waste : 54.0% Biogenic Municipal Solid Waste : 44.1% Natural Gas : 1.9%
Cottage Street Solar Facility	Western Massachusetts Electric Company	Springfield, MA	4 GWh	Apr 2014	Sep 2025	Solar
West Greenwich Solar	Consolidated Edison Development Inc.	West Greenwich, RI	3 GWh	Apr 2013	Sep 2025	Solar
Eastern Maine Medical Center	Eastern Maine Medical Center	Bangor, ME	31 GWh	Sep 2006	Sep 2025	Natural Gas
Jericho Power	Jericho Power LLC	Berlin, NH	22 GWh	Dec 2015	Sep 2025	Wind
Framingham State University Plant	Framingham State University	Framingham, MA	41 MWh	May 1974	Sep 2025	Solar : 78.0% Distillate Fuel Oil : 22.0%
Antares-GRE 314 East Lyme LLC	MN8 Energy LLC	East Lyme, CT	4 GWh	May 2014	Sep 2025	Solar
Fusion Solar Center LLC	Fusion Solar Centre, L.L.C	Baltic, CT	40 GWh	Feb 2018	Sep 2025	Solar
Groton Wind LLC	Avangrid Power LLC	Groton, NH	115 GWh	Nov 2012	Sep 2025	Wind
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%
General Electric Aircraft Engines	General Electric Aircraft Engines	Lynn, MA	2 GWh	Dec 1947	Sep 2025	Solar
SEMASS Resource Recovery	SEMASS Partnership	West Wareham, MA	569 GWh	Jun 1988	Sep 2025	Non-biogenic Municipal Solid Waste : 54.1% Biogenic Municipal Solid Waste : 44.3% Natural Gas : 1.5%
Covanta Haverhill	Ogden Projects Inc-Haverhill	Haverhill, MA	226 GWh	Apr 1989	Sep 2025	Non-biogenic Municipal Solid Waste : 52.2% Biogenic Municipal Solid Waste : 42.7% Distillate Fuel Oil : 5.1%
Algonquin Windsor Locks	Ahlstrom Power Windsor Locks LLC	Windsor Locks, CT	125 GWh	Dec 1989	Sep 2025	Natural Gas : 99.9%
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%
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Sep 2025	Natural Gas
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	2 TWh	May 1998	Sep 2025	Natural Gas
Wheelabrator Bridgeport	Wheelabrator Environmental Systems	Bridgeport, CT	473 GWh	Jun 1988	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	3 TWh	Apr 2001	Sep 2025	Natural Gas
Kibby Wind Facility	Helix Maine Wind Development, LLC	Chain of Ponds, ME	262 GWh	Sep 2009	Sep 2025	Wind
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	Sep 2025	Nuclear
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	Sep 2025	Natural Gas
Kendall Square Station	Kendall Green Energy, LLC	Cambridge, MA	2 TWh	May 1949	Sep 2025	Natural Gas : 99.1% Distillate Fuel Oil : 0.9%
Pfizer Groton Plant	Pfizer Inc	Groton, CT	78 GWh	Dec 1947	Sep 2025	Natural Gas : 91.4% Distillate Fuel Oil : 8.6%
Canal	Canal Generating LLC	Sandwich, MA	352 GWh	May 1968	Sep 2025	Natural Gas : 59.2% Residual Fuel Oil : 37.0% Distillate Fuel Oil : 3.8%
Granite Reliable Power	NexteraEnergy	Dummer, NH	195 GWh	Jan 2012	Sep 2025	Wind
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%
Cape Cod Air Force Station - 6 SWS	US Air Force	Sagamore, MA	5 GWh	Dec 2013	Sep 2025	Wind
Georgia Mountain Community Wind Farm	Greenbacker Renewable Energy Corporation	Milton, VT	30 GWh	Nov 2012	Sep 2025	Wind
UCONN Cogen Facility	University of Connecticut	Storrs, CT	124 GWh	Feb 2006	Sep 2025	Natural Gas : 98.9% Distillate Fuel Oil : 1.1%
Middlebury College	Middlebury College Biomass	Middlebury, VT	2 GWh	Dec 1979	Sep 2025	Wood/Wood Waste Solids : 62.2% Natural Gas : 37.8%
WED Coventry 2	WED Coventry Two, LLC	Coventry, RI	10 GWh	Jul 2016	Sep 2025	Wind
Passadumkeag Windpark LLC	Southern Power Co	Greenbush, ME	140 GWh	Jun 2016	Sep 2025	Wind
Hancock Wind Plant	Onward Energy	T22 MD, ME	121 GWh	Nov 2016	Sep 2025	Wind
Backus Microgrid Project	Connecticut Mun Elec Engy Coop	Norwich, CT	789 MWh	Jul 2014	Sep 2025	Distillate Fuel Oil
Spring Hill Road	AES Distributed Energy	Barre, MA	772 MWh	Nov 2015	Sep 2025	Solar
Stony Brook	Massachusetts Mun Wholes Electric Co	Ludlow, MA	125 GWh	Oct 1981	Sep 2025	Natural Gas : 74.6% Distillate Fuel Oil : 25.4%
NBC Field's Point Wind Farm	Narragansett Bay Commission	Providence, RI	7 GWh	Sep 2012	Sep 2025	Wind
WED Coventry 6	Greenbacker Renewable Energy Corporation	Coventry, RI	8 GWh	Jul 2016	Sep 2025	Wind
Frito Lay Incorporated	Frito Lay Incorporated Dayville	Dayville, CT	24 GWh	Feb 2009	Sep 2025	Natural Gas
UI RCP New Haven Fuel Cell	United Illuminating Co	New Haven, CT	13 GWh	Jul 2015	Sep 2025	Natural Gas
Antrim Wind	Antrim Wind Energy LLC	Antrim, NH	75 GWh	Nov 2019	Sep 2025	Wind
Pepperell Hydro Power Plant	Eagle Creek Renewable Energy, LLC	Pepperell, MA	4 GWh	Dec 1919	Sep 2025	Water
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	28 GWh	Dec 1984	Sep 2025	Water
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	123 GWh	Jun 1990	Sep 2025	Natural Gas : 98.6% Distillate Fuel Oil : 1.4%
Covanta Southeastern Connecticut Company	Covanta Southeastern Connecticut Company	Preston, CT	113 GWh	Nov 1991	Sep 2025	Non-biogenic Municipal Solid Waste : 54.1% Biogenic Municipal Solid Waste : 44.2% Distillate Fuel Oil : 1.7%
Searsburg Wind Turbine	Green Mountain Power Corp	Searsburg, VT	12 GWh	May 1997	Sep 2025	Wind
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%
Covanta Bristol Energy	Covanta Bristol Inc	Bristol, CT	108 GWh	Nov 1987	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Central Power Plant	State of Rhode Island	Cranston, RI	19 GWh	Jul 1958	Sep 2025	Natural Gas : 98.5% Distillate Fuel Oil : 1.5%
Merrimack	Granite Shore Power	Bow, NH	364 GWh	Nov 1960	Sep 2025	Bituminous Coal : 99.7%
Schiller	Granite Shore Power	Portsmouth, NH	590 MWh	Sep 1952	Sep 2025	Jet Fuel
Blackstone/Tupperware	Blackstone Hydro Inc.	North Smithfield, RI	2 GWh	Dec 1980	Sep 2025	Water
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%
Manchester Street	Manchester Street, LLC.	Providence, RI	2 TWh	Aug 1995	Sep 2025	Natural Gas : 98.5% Distillate Fuel Oil : 1.5%
Ascutney	Green Mountain Power Corp	Weatherfield, VT	113 MWh	Jul 1961	Sep 2025	Distillate Fuel Oil
Gillette SBMC	The Gillette Company	Boston, MA	55 GWh	Jan 1971	Sep 2025	Natural Gas
Wheelabrator Saugus	Wheelabrator Environmental Systems	Saugus, MA	226 GWh	Jul 1985	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Pratt & Whitney	United Technologies	East Hartford, CT	82 GWh	Dec 1991	Sep 2025	Natural Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	4 TWh	Jan 2004	Sep 2025	Natural Gas
Millennium Power	Millennium Power Company, LLC	Charlton, MA	482 GWh	Mar 2001	Sep 2025	Natural Gas
Dartmouth College Heating Plant	Dartmouth College	Hanover, NH	10 GWh	Dec 1969	Sep 2025	Residual Fuel Oil
Wheelabrator Millbury Facility	Wheelabrator Environmental Systems	Millbury, MA	318 GWh	Aug 1987	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
CPV Towantic Energy Center	CPV Towantic, LLC	Oxford, CT	5 TWh	Apr 2018	Sep 2025	Natural Gas
Fore River Generating Station	Calpine Fore River Energy Center, LLC	North Weymouth, MA	3 TWh	Jul 2003	Sep 2025	Natural Gas : 95.1% Distillate Fuel Oil : 4.9%
Wheelabrator North Andover	Wheelabrator Environmental Systems	North Andover, MA	233 GWh	Apr 1985	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	3 TWh	Feb 2003	Sep 2025	Natural Gas
Kleen Energy Systems Project	Kleen Energy Systems, LLC	Middletown, CT	3 TWh	Jun 2011	Sep 2025	Natural Gas : 99.3% Distillate Fuel Oil : 0.7%
Oakfield Wind Project	Onward Energy	City of Oakfield, ME	367 GWh	Sep 2015	Sep 2025	Wind
Lempster Wind LLC	Avangrid Power LLC	Lempster, NH	68 GWh	Nov 2008	Sep 2025	Wind
Berlin 5	Green Mountain Power Corp	Berlin, VT	1 GWh	May 1972	Sep 2025	Kerosene
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	Sep 2025	Natural Gas
Essex Junction 19	Green Mountain Power Corp	Essex Junction, VT	32 GWh	Dec 1916	Sep 2025	Water : 99.6%
Water Treatment 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	434 MWh	Sep 2010	Sep 2025	Distillate Fuel Oil
Block Island Wind Farm	Deepwater Wind Block Island LLC	NA, RI	85 GWh	Nov 2016	Sep 2025	Wind
Mt Wachusett Community College	Mt Wachusett Community College	Gardner, MA	4 GWh	Feb 2011	Sep 2025	Wind
Fort Hill 1, 2, 3 & 4	Connecticut Mun Elec Engy Coop	Uncasville, CT	618 MWh	Jul 2010	Sep 2025	Distillate Fuel Oil
Bingham Wind	Onward Energy	Bingham, ME	489 GWh	Nov 2016	Sep 2025	Wind

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