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	May 2025
Annual Generation	103.2 TWh
Power Plants	1,487
Utilities	782
Ranked #15 out of 65 in terms of net annual generation
Ranked #11 out of 53 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 57.3% Nuclear \| 24.7% Water \| 6.2% Other Fuel \| 4.5% Wind \| 3.6% Solar \| 1.4% Coal \| 0.3%

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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
Millstone	Dominion Energy Nuclear Conn Inc	Waterford, CT	17 TWh	Nov 1975	Mar 2025	Nuclear
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	Mar 2025	Nuclear
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	Mar 2025	Natural Gas
CPV Towantic Energy Center	CPV Towantic, LLC	Oxford, CT	6 TWh	Apr 2018	Mar 2025	Natural Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	4 TWh	Jan 2004	Mar 2025	Natural Gas
Bridgeport Station	Generation Bridge II Connecticut, LLC	Bridgeport, CT	3 TWh	Jul 1961	Mar 2025	Natural Gas : 98.6% Distillate Fuel Oil : 1.4%
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Mar 2025	Natural Gas
Fore River Generating Station	Calpine Fore River Energy Center, LLC	North Weymouth, MA	3 TWh	Jul 2003	Mar 2025	Natural Gas : 95.4% Distillate Fuel Oil : 4.6%
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	3 TWh	Apr 2001	Mar 2025	Natural Gas
Kleen Energy Systems Project	Kleen Energy Systems, LLC	Middletown, CT	3 TWh	Jun 2011	Mar 2025	Natural Gas : 99.2% Distillate Fuel Oil : 0.8%
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	Mar 2025	Natural Gas
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	3 TWh	Feb 2003	Mar 2025	Natural Gas
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	3 TWh	May 1998	Mar 2025	Natural Gas
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	2 TWh	May 2001	Mar 2025	Natural Gas
Mystic Generating Station	Constellation Mystic Power LLC	Charlestown, MA	2 TWh	May 1969	Mar 2024	Natural Gas
Tiverton Power Plant	Tiverton Power LLC	Tiverton, RI	2 TWh	Feb 2000	Dec 2023	Natural Gas
Newington	Essential Power Operating Services, LLC	Newington, NH	2 TWh	Sep 2002	Mar 2025	Natural Gas : 95.2% Distillate Fuel Oil : 4.8%
Kendall Square Station	Kendall Green Energy, LLC	Cambridge, MA	2 TWh	May 1949	Mar 2025	Natural Gas : 99.0% Distillate Fuel Oil : 1.0%
Manchester Street	Manchester Street, LLC.	Providence, RI	1 TWh	Aug 1995	Mar 2025	Natural Gas : 98.2% Distillate Fuel Oil : 1.8%
Ocean State Power	Ocean State Power Co	Harrisville, RI	1 TWh	Nov 1990	Dec 2023	Natural Gas : 99.6%
Salem Harbor Power Development LP	Salem Harbor Power Development LP	Salem, MA	1 TWh	Apr 2018	Mar 2025	Natural Gas
Ocean State Power II	Ocean State Power II	Harrisville, RI	1 TWh	Sep 1991	Dec 2023	Natural Gas : 99.7%
Maine Independence Station	Casco Bay Energy Co LLC	Veazie, ME	937 GWh	Apr 2000	Dec 2023	Natural Gas
Great Lakes Hydro America - ME	Great Lakes Hydro America LLC	Millinocket, ME	737 GWh	Jun 1917	Dec 2023	Water
Masspower	Masspower	Indian Orchard, MA	609 GWh	Jun 1993	Dec 2023	Natural Gas
SEMASS Resource Recovery	SEMASS Partnership	West Wareham, MA	569 GWh	Jun 1988	Mar 2025	Non-biogenic Municipal Solid Waste : 54.1% Biogenic Municipal Solid Waste : 44.3% Natural Gas : 1.5%
Somerset Plant	Sappi Fine Paper North America-Somerset	Skowhegan, ME	534 GWh	Dec 1975	Mar 2025	Black Liquor : 46.9% Wood/Wood Waste Solids : 36.7% Tire-derived Fuels : 6.3% Natural Gas : 6.3% Residual Fuel Oil : 2.7% Sludge Waste : 1.0%
Wyman Hydro	Brookfield White Pine Hydro LLC	Bingham, ME	502 GWh	Dec 1929	Dec 2023	Water
Burgess BioPower	Berlin Station, LLC	Berlin, NH	496 GWh	Oct 2013	Dec 2023	Wood/Wood Waste Solids : 98.3% Distillate Fuel Oil : 1.7%
Bingham Wind	Onward Energy	Bingham, ME	485 GWh	Nov 2016	Mar 2025	Wind
Millennium Power	Millennium Power Company, LLC	Charlton, MA	465 GWh	Mar 2001	Mar 2025	Natural Gas
Wheelabrator Bridgeport	Wheelabrator Environmental Systems	Bridgeport, CT	460 GWh	Jun 1988	Mar 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	430 GWh	Dec 1989	Mar 2025	Black Liquor : 53.8% Tire-derived Fuels : 22.8% Wood/Wood Waste Solids : 11.8% Bituminous Coal : 7.4% Residual Fuel Oil : 3.1% Sludge Waste : 1.0%
Comerford	Great River Hydro, LLC	Monroe, NH	405 GWh	Aug 1930	Dec 2023	Water
Rumford Power LLC	Rumford Power	Rumford, ME	403 GWh	Jun 2000	Dec 2023	Natural Gas
Cabot	FirstLight Power Resources, Inc. - MA	Montague, MA	394 GWh	Dec 1914	Dec 2023	Water
Dighton Power Plant	Dighton Power, LLC	Dighton, MA	358 GWh	Apr 1999	Dec 2023	Natural Gas
Oakfield Wind Project	Onward Energy	City of Oakfield, ME	355 GWh	Sep 2015	Mar 2025	Wind
Medical Area Total Energy Plant	MATEP LLC	Boston, MA	339 GWh	Dec 1979	Dec 2023	Natural Gas : 99.7%
S C Moore	Great River Hydro, LLC	Littleton, NH	328 GWh	Dec 1956	Dec 2023	Water
Wheelabrator Millbury Facility	Wheelabrator Environmental Systems	Millbury, MA	323 GWh	Aug 1987	Mar 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Merrimack	Granite Shore Power	Bow, NH	317 GWh	Nov 1960	Mar 2025	Bituminous Coal : 99.6%
Canal	Canal Generating LLC	Sandwich, MA	305 GWh	May 1968	Mar 2025	Natural Gas : 73.0% Residual Fuel Oil : 24.5% Distillate Fuel Oil : 2.5%
Bellows Falls	Great River Hydro, LLC	Bellow Falls, VT	305 GWh	Feb 1928	Dec 2023	Water
Covanta Haverhill	Ogden Projects Inc-Haverhill	Haverhill, MA	298 GWh	Apr 1989	Mar 2025	Non-biogenic Municipal Solid Waste : 54.8% Biogenic Municipal Solid Waste : 44.8%
Rumford Falls Hydro Facility	Brookfield Power New England	Rumford, ME	290 GWh	Dec 1917	Dec 2023	Water
Harris Hydro	Brookfield White Pine Hydro LLC	West Forks, ME	278 GWh	Dec 1953	Dec 2023	Water
Kibby Wind Facility	Helix Maine Wind Development, LLC	Chain of Ponds, ME	269 GWh	Sep 2009	Mar 2025	Wind
Wheelabrator North Andover	Wheelabrator Environmental Systems	North Andover, MA	239 GWh	Apr 1985	Mar 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Plainfield Renewable Energy LLC	Plainfield Renewable Energy, LLC	Plainfield, CT	234 GWh	Nov 2013	Dec 2023	Wood/Wood Waste Solids : 99.6%
Wheelabrator Saugus	Wheelabrator Environmental Systems	Saugus, MA	231 GWh	Jul 1985	Mar 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
ReEnergy Livermore Falls	ReEnergy Livermore Falls	Livermore Falls, ME	223 GWh	Jul 1992	Dec 2023	Wood/Wood Waste Solids
Exelon West Medway II LLC	Constellation Power, Inc	Medway, MA	221 GWh	Feb 2019	Mar 2025	Natural Gas : 98.2% Kerosene : 1.8%
Hadley Falls	City of Holyoke Gas and Electric Dept.	Holyoke, MA	218 GWh	Dec 1951	Dec 2023	Water
Kimberly Clark-Unit 1,2,3	Kimberly-Clark Corporation	New Milford, CT	217 GWh	Mar 2008	Dec 2023	Natural Gas
Weaver Wind	Weaver Wind, LLC (Longroad)	Township 16, ME	212 GWh	Nov 2020	Mar 2025	Wind
Milford Power LP	Milford Power LLC	Milford, MA	210 GWh	Feb 1993	Dec 2023	Natural Gas
Mass Inst Tech Cntrl Utilities/Cogen Plt	Massachusetts Inst of Tech	Cambridge, MA	205 GWh	May 1995	Dec 2023	Natural Gas
J C McNeil	City of Burlington Electric - (VT)	Burlington, VT	202 GWh	May 1984	Mar 2025	Wood/Wood Waste Solids : 99.8%
Granite Reliable Power	NexteraEnergy	Dummer, NH	198 GWh	Jan 2012	Mar 2025	Wind
Wilder	Great River Hydro, LLC	Hartford, VT	192 GWh	Oct 1950	Dec 2023	Water
Vernon Dam	Great River Hydro, LLC	Vernon, VT	191 GWh	Jul 1909	Dec 2023	Water
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	187 GWh	Apr 2013	Mar 2025	Landfill Gas
Kingdom Community Wind	Green Mountain Power Corp	Lowell, VT	181 GWh	Oct 2012	Mar 2025	Wind
ReEnergy Stratton LLC	ReEnergy Stratton LLC	Stratton, ME	177 GWh	Oct 1989	Dec 2023	Wood/Wood Waste Solids
Charles E Monty	Brookfield White Pine Hydro LLC	Lewiston, ME	177 GWh	Dec 1989	Dec 2023	Water
Middletown	Middletown Power LLC	Middletown, CT	170 GWh	Sep 1958	Dec 2023	Natural Gas : 79.3% Residual Fuel Oil : 20.7%
Gulf Island	Brookfield White Pine Hydro LLC	Lewiston, ME	169 GWh	Dec 1925	Dec 2023	Water
Berlin Gorham	Great Lakes Hydro America LLC	Berlin, NH	168 GWh	Dec 1913	Dec 2023	Water
Shepaug	FirstLight Power Resources Services LLC	Southbury, CT	163 GWh	Dec 1954	Dec 2023	Water
Wallingford Energy	Wallingford Energy LLC	Wallingford, CT	161 GWh	Jul 2001	Dec 2023	Natural Gas
Ryegate Associates, LLC	Ryegate Associates, LLC	East Ryegate, VT	161 GWh	Aug 1992	Dec 2023	Wood/Wood Waste Solids
Toray Plastic America's CHP Plant	Toray Plastics America	North Kingstown, RI	157 GWh	Dec 2002	Dec 2023	Natural Gas
Anson Abenaki Hydros	Eagle Creek Renewable Energy, LLC	Madison, ME	145 GWh	Dec 1949	Dec 2023	Water
Skelton	Brookfield White Pine Hydro LLC	Dayton, ME	137 GWh	Dec 1947	Dec 2023	Water
Three Corners Solar	Three Corners Solar, LLC	Unity, ME	133 GWh	-	Mar 2025	Solar
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	133 GWh	Mar 2005	Mar 2025	Natural Gas
Rollins Wind Project	Evergreen Wind, LLC	Winn Village, ME	132 GWh	Jun 2011	Dec 2023	Wind
Passadumkeag Windpark LLC	Southern Power Co	Greenbush, ME	132 GWh	Jun 2016	Mar 2025	Wind
Farmington Solar	Farmington Solar, LLC	Farmington, ME	129 GWh	Sep 2021	Mar 2025	Solar
Harriman	Great River Hydro, LLC	Whitingham, VT	126 GWh	Apr 1924	Dec 2023	Water
UCONN Cogen Facility	University of Connecticut	Storrs, CT	124 GWh	Feb 2006	Mar 2025	Natural Gas : 98.9% Distillate Fuel Oil : 1.1%
Brunswick Hydro	Brookfield White Pine Hydro LLC	Brunswick, ME	123 GWh	Feb 1982	Dec 2023	Water
Smith (NH)	Central Rivers Power NH, LLC	Berlin, NH	123 GWh	Jul 1948	Dec 2023	Water
Algonquin Windsor Locks	Algonquin Windsor Locks LLC	Windsor Locks, CT	120 GWh	Dec 1989	Mar 2025	Natural Gas : 99.9%
Hancock Wind Plant	Onward Energy	T22 MD, ME	118 GWh	Nov 2016	Mar 2025	Wind
Amoskeag	Central Rivers Power NH, LLC	Manchester, NH	114 GWh	Jul 1922	Dec 2023	Water
Covanta Southeastern Connecticut Company	Covanta Southeastern Connecticut Company	Preston, CT	112 GWh	Nov 1991	Mar 2025	Non-biogenic Municipal Solid Waste : 54.2% Biogenic Municipal Solid Waste : 44.4% Distillate Fuel Oil : 1.4%
Stevenson	FirstLight Power Resources Services LLC	Monroe, CT	111 GWh	Dec 1918	Dec 2023	Water
Record Hill Wind	Record Hill Wind LLC	Roxbury, ME	111 GWh	Dec 2011	Dec 2023	Wind
Groton Wind LLC	Avangrid Renewables LLC	Groton, NH	110 GWh	Nov 2012	Mar 2025	Wind
Bridgewater Power LP	Bridgewater Power Co LP	Bridgewater, NH	109 GWh	Jul 1987	Dec 2023	Wood/Wood Waste Solids : 99.8%
Covanta Bristol Energy	Covanta Bristol Inc	Bristol, CT	109 GWh	Nov 1987	Mar 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Stetson Wind I	Evergreen Wind, LLC	Danforth, ME	107 GWh	Dec 2008	Dec 2023	Wind
Bridgeport Fuel Cell, LLC	Bridgeport Fuel Cell, LLC	Bridgeport, CT	105 GWh	Nov 2013	Dec 2023	Natural Gas
Worumbo Hydro Station	Eagle Creek Renewable Energy, LLC	Lisbon Falls, ME	105 GWh	Jan 1989	Dec 2023	Water
Bellingham Cogeneration Facility	Northeast Energy Associates LP	Bellingham, MA	102 GWh	Aug 1991	Nov 2023	Natural Gas : 88.2% Distillate Fuel Oil : 11.8%
West Enfield Hydro	Brookfield Black Bear Hydro, LLC	West Enfield, ME	100 GWh	Mar 1988	Dec 2023	Water
Wheelabrator Lisbon	Wheelabrator Environmental Systems	Lisbon, CT	99 GWh	Sep 1995	Mar 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Williams Hydro	Brookfield White Pine Hydro LLC	Solon, ME	97 GWh	Dec 1938	Dec 2023	Water

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	727.7 GWh	4
#25	Dominion Energy South Carolina, Inc.	26.1 TWh	85
#13	Duke Energy Carolinas	111.4 TWh	556
#17	Duke Energy Progress East	65.1 TWh	554
#52	Duke Energy Progress West	4.1 TWh	10
#24	Louisville Gas and Electric Company and Kentucky Utilities Company	33.8 TWh	20
#12	New York Independent System Operator	130.6 TWh	1,100
#1	PJM Interconnection, LLC	858.5 TWh	2,305
#29	South Carolina Public Service Authority	19.2 TWh	33
#60	Southeastern Power Administration	1.4 TWh	11

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#7	California Independent System Operator	190.1 TWh	1,943
#8	Tennessee Valley Authority	158.8 TWh	170
#10	Florida Power & Light Co.	148.3 TWh	159
#12	New York Independent System Operator	130.6 TWh	1,100
#13	Duke Energy Carolinas	111.4 TWh	556
#15	ISO New England	103.2 TWh	1,487
#16	Bonneville Power Administration	82.2 TWh	158
#17	Duke Energy Progress East	65.1 TWh	554
#18	Salt River Project Agricultural Improvement and Power District	58.7 TWh	45
#19	PacifiCorp East	57.2 TWh	204