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
Millstone	Dominion Energy Nuclear Conn Inc	Waterford, CT	17 TWh	Nov 1975	Jul 2026	Nuclear
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	Jul 2026	Nuclear
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	Jul 2026	Natural Gas
CPV Towantic Energy Center	CPV Towantic, LLC	Oxford, CT	6 TWh	Apr 2018	Jul 2026	Natural Gas
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
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	3 TWh	Apr 2001	Jul 2026	Natural Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	3 TWh	Jan 2004	Jul 2026	Natural Gas
Bridgeport Station	Generation Bridge II Connecticut, LLC	Bridgeport, CT	3 TWh	Jul 1961	Jul 2026	Natural Gas : 84.6% Distillate Fuel Oil : 15.4%
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Jul 2026	Natural Gas
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	Jul 2026	Natural Gas
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	3 TWh	May 1998	Jul 2026	Natural Gas
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	3 TWh	May 2001	Jul 2026	Natural Gas
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%
Manchester Street	Manchester Street, LLC.	Providence, RI	2 TWh	Aug 1995	Jul 2026	Natural Gas : 92.5% Distillate Fuel Oil : 7.5%
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%
Tiverton Power Plant	Tiverton Power LLC	Tiverton, RI	2 TWh	Feb 2000	Dec 2025	Natural Gas
Maine Independence Station	Casco Bay Energy Co LLC	Veazie, ME	1 TWh	Apr 2000	Dec 2025	Natural Gas
Kendall Square Station	Kendall Green Energy, LLC	Cambridge, MA	1 TWh	May 1949	Jul 2026	Natural Gas : 97.3% Distillate Fuel Oil : 2.7%
Salem Harbor Power Development LP	Salem Harbor Power Development LP	Salem, MA	1 TWh	Apr 2018	Jul 2026	Natural Gas
Ocean State Power	Ocean State Power Co	Harrisville, RI	1 TWh	Nov 1990	Dec 2025	Natural Gas : 99.7%
Millennium Power	Millennium Power Company, LLC	Charlton, MA	880 GWh	Mar 2001	Jul 2026	Natural Gas
Berkshire Power	Berkshire Power Co LLC	Agawam, MA	810 GWh	Aug 1999	Dec 2025	Natural Gas
Rumford Power LLC	Rumford Power	Rumford, ME	793 GWh	Jun 2000	Dec 2025	Natural Gas
Ocean State Power II	Ocean State Power II	Harrisville, RI	577 GWh	Sep 1991	Dec 2025	Natural Gas : 99.9%
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%
Vineyard Wind 1	Vineyard Wind 1 LLC	Edgartown, MA	564 GWh	-	Jul 2026	Wind
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%
Great Lakes Hydro America - ME	Great Lakes Hydro America LLC	Millinocket, ME	500 GWh	Jun 1917	Dec 2025	Water
Bingham Wind	Onward Energy	Bingham, ME	475 GWh	Nov 2016	Jul 2026	Wind
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%
Masspower	Masspower	Indian Orchard, MA	442 GWh	Jun 1993	Dec 2025	Natural Gas
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%
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%
Burgess BioPower	Berlin Station, LLC	Berlin, NH	390 GWh	Oct 2013	Dec 2025	Wood/Wood Waste Solids
Downeast Wind	Downeast Wind, LLC	Columbia, ME	382 GWh	Dec 2024	Jul 2026	Wind
Oakfield Wind Project	Onward Energy	City of Oakfield, ME	330 GWh	Sep 2015	Jul 2026	Wind
William F Wyman Hybrid	FPL Energy Wyman LLC	Yarmouth, ME	323 GWh	Dec 1956	Jul 2026	Residual Fuel Oil : 99.6%
Bellingham Cogeneration Facility	Northeast Energy Associates LP	Bellingham, MA	318 GWh	Aug 1991	Dec 2025	Natural Gas : 95.7% Distillate Fuel Oil : 4.3%
Medical Area Total Energy Plant	MATEP LLC	Boston, MA	314 GWh	Dec 1979	Dec 2025	Natural Gas : 99.0% Distillate Fuel Oil : 1.0%
Comerford	Great River Hydro, LLC	Monroe, NH	297 GWh	Aug 1930	Dec 2025	Water
Wyman Hydro	Brookfield White Pine Hydro LLC	Bingham, ME	295 GWh	Dec 1929	Dec 2025	Water
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%
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%
Dighton Power Plant	Dighton Power, LLC	Dighton, MA	276 GWh	Apr 1999	Dec 2025	Natural Gas
ReEnergy Livermore Falls	ReEnergy Livermore Falls	Livermore Falls, ME	274 GWh	Jul 1992	Dec 2025	Wood/Wood Waste Solids
S C Moore	Great River Hydro, LLC	Littleton, NH	255 GWh	Dec 1956	Dec 2025	Water
Milford Power LP	Milford Power LLC	Milford, MA	253 GWh	Feb 1993	Dec 2025	Natural Gas
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%
Kibby Wind Facility	Helix Maine Wind Development, LLC	Chain of Ponds, ME	245 GWh	Sep 2009	Jul 2026	Wind
Plainfield Renewable Energy LLC	Plainfield Renewable Energy, LLC	Plainfield, CT	245 GWh	Nov 2013	Dec 2025	Wood/Wood Waste Solids : 99.3% Other Biomass Liquids : 0.7%
Cabot	FirstLight Power Resources, Inc. - MA	Montague, MA	239 GWh	Dec 1914	Dec 2025	Water
Kimberly Clark-Unit 1,2,3	Kimberly-Clark Corporation	New Milford, CT	233 GWh	Mar 2008	Dec 2025	Natural Gas
Exelon West Medway II LLC	Constellation Power, Inc	Medway, MA	231 GWh	Feb 2019	Jul 2026	Natural Gas : 94.7% Kerosene : 5.3%
Weaver Wind	Greenbacker Renewable Energy Corporation	Township 16, ME	215 GWh	Nov 2020	Jul 2026	Wind
Rumford Falls Hydro Facility	Brookfield Power New England	Rumford, ME	212 GWh	Dec 1917	Dec 2025	Water
Mass Inst Tech Cntrl Utilities/Cogen Plt	Massachusetts Inst of Tech	Cambridge, MA	209 GWh	May 1995	Dec 2025	Natural Gas
Gravel Pit Solar, LLC	Gravel Pit Solar, LLC	East Windsor, CT	205 GWh	Jan 2025	Jul 2026	Solar
ReEnergy Stratton LLC	ReEnergy Stratton LLC	Stratton, ME	200 GWh	Oct 1989	Dec 2025	Wood/Wood Waste Solids
Granite Reliable Power	NexteraEnergy	Dummer, NH	199 GWh	Jan 2012	Jul 2026	Wind
Three Corners Solar	Three Corners Solar, LLC	Unity, ME	196 GWh	Jun 2024	Jul 2026	Solar
Bellows Falls	Great River Hydro, LLC	Bellow Falls, VT	194 GWh	Feb 1928	Dec 2025	Water
J C McNeil	City of Burlington Electric - (VT)	Burlington, VT	189 GWh	May 1984	Jul 2026	Wood/Wood Waste Solids : 99.6%
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%
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	170 GWh	Apr 2013	Jul 2026	Landfill Gas
Kingdom Community Wind	Green Mountain Power Corp	Lowell, VT	168 GWh	Oct 2012	Jul 2026	Wind
Ryegate Associates, LLC	Ryegate Associates, LLC	East Ryegate, VT	158 GWh	Aug 1992	Dec 2025	Wood/Wood Waste Solids
Toray Plastic America's CHP Plant	Toray Plastics America	North Kingstown, RI	157 GWh	Dec 2002	Dec 2025	Natural Gas
Harris Hydro	Brookfield White Pine Hydro LLC	West Forks, ME	151 GWh	Dec 1953	Dec 2025	Water
Rollins Wind Project	Evergreen Wind, LLC	Winn Village, ME	147 GWh	Jun 2011	Dec 2025	Wind
Stetson Wind I	Evergreen Wind, LLC	Danforth, ME	146 GWh	Dec 2008	Dec 2025	Wind
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%
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%
Hadley Falls	City of Holyoke Gas and Elec Dept - (MA)	Holyoke, MA	137 GWh	Dec 1951	Dec 2025	Water
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%
Passadumkeag Windpark LLC	Southern Power Co	Greenbush, ME	135 GWh	Jun 2016	Jul 2026	Wind
Wilder	Great River Hydro, LLC	Hartford, VT	134 GWh	Oct 1950	Dec 2025	Water
Stony Brook	Massachusetts Mun Wholes Electric Co	Ludlow, MA	133 GWh	Oct 1981	Jul 2026	Distillate Fuel Oil : 73.3% Natural Gas : 26.7%
Montville Station	Montville Power LLC	Uncasville, CT	133 GWh	Dec 1953	Dec 2025	Residual Fuel Oil : 74.2% Natural Gas : 24.9% Distillate Fuel Oil : 0.9%
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	132 GWh	Mar 2005	Jul 2026	Natural Gas
Moscow	Greenbacker Renewable Energy Corporation	Moscow, ME	127 GWh	May 2025	Jul 2026	Wind
Farmington Solar	Farmington Solar, LLC	Farmington, ME	127 GWh	Sep 2021	Jul 2026	Solar
Vernon Dam	Great River Hydro, LLC	Vernon, VT	119 GWh	Jul 1909	Dec 2025	Water
Gulf Island	Brookfield White Pine Hydro LLC	Lewiston, ME	115 GWh	Dec 1925	Dec 2025	Water
Hancock Wind Plant	Onward Energy	T22 MD, ME	115 GWh	Nov 2016	Jul 2026	Wind
Charles E Monty	Brookfield White Pine Hydro LLC	Lewiston, ME	114 GWh	Dec 1989	Dec 2025	Water
UCONN Cogen Facility	University of Connecticut	Storrs, CT	111 GWh	Feb 2006	Jul 2026	Natural Gas : 95.1% Distillate Fuel Oil : 4.9%
Derby Fuel Cell	Derby Fuel Cell LLC	Derby, CT	110 GWh	Dec 2023	Dec 2025	Natural Gas
Record Hill Wind	Record Hill Wind LLC	Roxbury, ME	110 GWh	Dec 2011	Dec 2025	Wind
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%
Wallingford Energy	Wallingford Energy LLC	Wallingford, CT	107 GWh	Jul 2001	Dec 2025	Natural Gas
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%
Groton Wind LLC	Avangrid Power LLC	Groton, NH	104 GWh	Nov 2012	Jul 2026	Wind
Bridgewater Power LP	Bridgewater Power Co LP	Bridgewater, NH	103 GWh	Jul 1987	Dec 2025	Wood/Wood Waste Solids : 99.8%
Berlin Gorham	Great Lakes Hydro America LLC	Berlin, NH	101 GWh	Dec 1913	Dec 2025	Water
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%
Anson Abenaki Hydros	Eagle Creek Renewable Energy, LLC	Madison, ME	101 GWh	Dec 1949	Dec 2025	Water
Harriman	Great River Hydro, LLC	Whitingham, VT	98 GWh	Apr 1924	Dec 2025	Water
Pratt & Whitney	United Technologies	East Hartford, CT	96 GWh	Dec 1991	Jul 2026	Natural Gas
Deerfield Wind LLC	Avangrid Power LLC	Searsburg, VT	94 GWh	Nov 2017	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