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
Millstone	Dominion Energy Nuclear Conn Inc	Waterford, CT	16 TWh	Nov 1975	Sep 2025	Nuclear
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	Sep 2025	Nuclear
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	Sep 2025	Natural Gas
CPV Towantic Energy Center	CPV Towantic, LLC	Oxford, CT	5 TWh	Apr 2018	Sep 2025	Natural Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	4 TWh	Jan 2004	Sep 2025	Natural Gas
Bridgeport Station	Generation Bridge II Connecticut, LLC	Bridgeport, CT	4 TWh	Jul 1961	Sep 2025	Natural Gas : 98.6% Distillate Fuel Oil : 1.4%
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	Sep 2025	Natural Gas
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	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%
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%
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	3 TWh	Feb 2003	Sep 2025	Natural Gas
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	3 TWh	May 2001	Sep 2025	Natural Gas
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	3 TWh	Apr 2001	Sep 2025	Natural Gas
Maine Independence Station	Casco Bay Energy Co LLC	Veazie, ME	3 TWh	Apr 2000	Dec 2024	Natural Gas
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	2 TWh	May 1998	Sep 2025	Natural Gas
Mystic Generating Station	Constellation Mystic Power LLC	Charlestown, MA	2 TWh	May 1969	Mar 2024	Natural Gas
Manchester Street	Manchester Street, LLC.	Providence, RI	2 TWh	Aug 1995	Sep 2025	Natural Gas : 98.5% Distillate Fuel Oil : 1.5%
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%
Salem Harbor Power Development LP	Salem Harbor Power Development LP	Salem, MA	2 TWh	Apr 2018	Sep 2025	Natural Gas
Tiverton Power Plant	Tiverton Power LLC	Tiverton, RI	2 TWh	Feb 2000	Dec 2024	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%
Ocean State Power	Ocean State Power Co	Harrisville, RI	1 TWh	Nov 1990	Dec 2024	Natural Gas : 99.9%
Ocean State Power II	Ocean State Power II	Harrisville, RI	897 GWh	Sep 1991	Dec 2024	Natural Gas : 99.9%
Rumford Power LLC	Rumford Power	Rumford, ME	638 GWh	Jun 2000	Dec 2024	Natural Gas
Berkshire Power	Berkshire Power Co LLC	Agawam, MA	573 GWh	Aug 1999	Dec 2024	Natural Gas
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%
Great Lakes Hydro America - ME	Great Lakes Hydro America LLC	Millinocket, ME	571 GWh	Jun 1917	Dec 2024	Water
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%
Dighton Power Plant	Dighton Power, LLC	Dighton, MA	531 GWh	Apr 1999	Dec 2024	Natural Gas
Bingham Wind	Onward Energy	Bingham, ME	489 GWh	Nov 2016	Sep 2025	Wind
Millennium Power	Millennium Power Company, LLC	Charlton, MA	482 GWh	Mar 2001	Sep 2025	Natural Gas
Masspower	Masspower	Indian Orchard, MA	476 GWh	Jun 1993	Dec 2024	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%
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%
Comerford	Great River Hydro, LLC	Monroe, NH	400 GWh	Aug 1930	Dec 2024	Water
Bellingham Cogeneration Facility	Northeast Energy Associates LP	Bellingham, MA	368 GWh	Aug 1991	Dec 2024	Natural Gas : 99.9%
Oakfield Wind Project	Onward Energy	City of Oakfield, ME	367 GWh	Sep 2015	Sep 2025	Wind
Merrimack	Granite Shore Power	Bow, NH	364 GWh	Nov 1960	Sep 2025	Bituminous Coal : 99.7%
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%
Burgess BioPower	Berlin Station, LLC	Berlin, NH	349 GWh	Oct 2013	Dec 2024	Wood/Wood Waste Solids
S C Moore	Great River Hydro, LLC	Littleton, NH	341 GWh	Dec 1956	Dec 2024	Water
Wyman Hydro	Brookfield White Pine Hydro LLC	Bingham, ME	337 GWh	Dec 1929	Dec 2024	Water
Medical Area Total Energy Plant	MATEP LLC	Boston, MA	318 GWh	Dec 1979	Dec 2024	Natural Gas : 98.3% Distillate Fuel Oil : 1.7%
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%
Cabot	FirstLight Power Resources, Inc. - MA	Montague, MA	304 GWh	Dec 1914	Dec 2024	Water
ReEnergy Livermore Falls	ReEnergy Livermore Falls	Livermore Falls, ME	267 GWh	Jul 1992	Dec 2024	Wood/Wood Waste Solids
Bellows Falls	Great River Hydro, LLC	Bellow Falls, VT	264 GWh	Feb 1928	Dec 2024	Water
Kibby Wind Facility	Helix Maine Wind Development, LLC	Chain of Ponds, ME	262 GWh	Sep 2009	Sep 2025	Wind
Rumford Falls Hydro Facility	Brookfield Power New England	Rumford, ME	261 GWh	Dec 1917	Dec 2024	Water
Milford Power LP	Milford Power LLC	Milford, MA	253 GWh	Feb 1993	Dec 2024	Natural Gas
Plainfield Renewable Energy LLC	Plainfield Renewable Energy, LLC	Plainfield, CT	247 GWh	Nov 2013	Oct 2024	Wood/Wood Waste Solids : 99.5% Other Biomass Liquids : 0.5%
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%
J C McNeil	City of Burlington Electric - (VT)	Burlington, VT	228 GWh	May 1984	Sep 2025	Wood/Wood Waste Solids : 99.9%
Weaver Wind	Weaver Wind, LLC (Longroad)	Township 16, ME	227 GWh	Nov 2020	Sep 2025	Wind
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%
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%
Kimberly Clark-Unit 1,2,3	Kimberly-Clark Corporation	New Milford, CT	219 GWh	Mar 2008	Dec 2024	Natural Gas
Mass Inst Tech Cntrl Utilities/Cogen Plt	Massachusetts Inst of Tech	Cambridge, MA	205 GWh	May 1995	Dec 2024	Natural Gas
ReEnergy Stratton LLC	ReEnergy Stratton LLC	Stratton, ME	203 GWh	Oct 1989	Dec 2024	Wood/Wood Waste Solids
Granite Reliable Power	NexteraEnergy	Dummer, NH	195 GWh	Jan 2012	Sep 2025	Wind
Three Corners Solar	Three Corners Solar, LLC	Unity, ME	189 GWh	Jun 2024	Sep 2025	Solar
Kingdom Community Wind	Green Mountain Power Corp	Lowell, VT	180 GWh	Oct 2012	Sep 2025	Wind
Wilder	Great River Hydro, LLC	Hartford, VT	179 GWh	Oct 1950	Dec 2024	Water
Exelon West Medway II LLC	Constellation Power, Inc	Medway, MA	171 GWh	Feb 2019	Sep 2025	Natural Gas : 97.7% Kerosene : 2.3%
Harris Hydro	Brookfield White Pine Hydro LLC	West Forks, ME	170 GWh	Dec 1953	Dec 2024	Water
Vernon Dam	Great River Hydro, LLC	Vernon, VT	160 GWh	Jul 1909	Dec 2024	Water
Hadley Falls	City of Holyoke Gas and Electric Dept.	Holyoke, MA	151 GWh	Dec 1951	Dec 2024	Water
Ryegate Associates, LLC	Ryegate Associates, LLC	East Ryegate, VT	150 GWh	Aug 1992	Dec 2024	Wood/Wood Waste Solids
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	149 GWh	Apr 2013	Sep 2025	Landfill Gas
Toray Plastic America's CHP Plant	Toray Plastics America	North Kingstown, RI	147 GWh	Dec 2002	Dec 2024	Natural Gas
Downeast Wind	Downeast Wind, LLC	Columbia, ME	145 GWh	-	Sep 2025	Wind
Charles E Monty	Brookfield White Pine Hydro LLC	Lewiston, ME	141 GWh	Dec 1989	Dec 2024	Water
Passadumkeag Windpark LLC	Southern Power Co	Greenbush, ME	140 GWh	Jun 2016	Sep 2025	Wind
Gulf Island	Brookfield White Pine Hydro LLC	Lewiston, ME	136 GWh	Dec 1925	Dec 2024	Water
Rollins Wind Project	Evergreen Wind, LLC	Winn Village, ME	136 GWh	Jun 2011	Dec 2024	Wind
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	135 GWh	Mar 2005	Sep 2025	Natural Gas
Berlin Gorham	Great Lakes Hydro America LLC	Berlin, NH	133 GWh	Dec 1913	Dec 2024	Water
Cleary Flood Hybrid	City of Taunton	Taunton, MA	133 GWh	May 1966	Dec 2024	Natural Gas : 99.8%
Farmington Solar	Farmington Solar, LLC	Farmington, ME	129 GWh	Sep 2021	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%
Algonquin Windsor Locks	Ahlstrom Power Windsor Locks LLC	Windsor Locks, CT	125 GWh	Dec 1989	Sep 2025	Natural Gas : 99.9%
UCONN Cogen Facility	University of Connecticut	Storrs, CT	124 GWh	Feb 2006	Sep 2025	Natural Gas : 98.9% Distillate Fuel Oil : 1.1%
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	123 GWh	Jun 1990	Sep 2025	Natural Gas : 98.6% Distillate Fuel Oil : 1.4%
Hancock Wind Plant	Onward Energy	T22 MD, ME	121 GWh	Nov 2016	Sep 2025	Wind
Stetson Wind I	Evergreen Wind, LLC	Danforth, ME	121 GWh	Dec 2008	Dec 2024	Wind
Shepaug	FirstLight Power Resources Services LLC	Southbury, CT	117 GWh	Dec 1954	Dec 2024	Water
Anson Abenaki Hydros	Eagle Creek Renewable Energy, LLC	Madison, ME	116 GWh	Dec 1949	Dec 2024	Water
Record Hill Wind	Record Hill Wind LLC	Roxbury, ME	115 GWh	Dec 2011	Dec 2024	Wind
Groton Wind LLC	Avangrid Power LLC	Groton, NH	115 GWh	Nov 2012	Sep 2025	Wind
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%
Gravel Pit Solar, LLC	Gravel Pit Solar, LLC	East Windsor, CT	113 GWh	-	Sep 2025	Solar
Smith (NH)	Central Rivers Power NH, LLC	Berlin, NH	112 GWh	Jul 1948	Dec 2024	Water
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%
Derby Fuel Cell	Derby Fuel Cell LLC	Derby, CT	106 GWh	Dec 2023	Dec 2024	Natural Gas
Central Heating Plant	University of Massachusetts Amherst	Amherst, MA	104 GWh	Sep 2007	Dec 2024	Natural Gas : 98.5% Distillate Fuel Oil : 1.5%
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%
Bridgeport Fuel Cell, LLC	Bridgeport Fuel Cell, LLC	Bridgeport, CT	97 GWh	Nov 2013	Dec 2024	Natural Gas
Stevenson	FirstLight Power Resources Services LLC	Monroe, CT	96 GWh	Dec 1918	Dec 2024	Water
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%
Newington	Granite Shore Power	Newington, NH	95 GWh	May 1974	Aug 2025	Natural Gas : 60.0% Residual Fuel Oil : 39.5% Distillate Fuel Oil : 0.6%

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