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	Apr 2025
Annual Generation	103.6 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 \| 57.1% Nuclear \| 25.3% Water \| 6.1% Other Fuel \| 4.5% Wind \| 3.5% 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
Merrimack	Granite Shore Power	Bow, NH	323 GWh	Nov 1960	Feb 2025	Bituminous Coal : 99.6%
Somerset Plant	Sappi Fine Paper North America-Somerset	Skowhegan, ME	541 GWh	Dec 1975	Feb 2025	Black Liquor : 46.6% Wood/Wood Waste Solids : 37.6% Tire-derived Fuels : 6.2% Natural Gas : 5.9% Residual Fuel Oil : 2.6% Sludge Waste : 1.0%
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	425 GWh	Dec 1989	Feb 2025	Black Liquor : 53.9% Tire-derived Fuels : 23.2% Wood/Wood Waste Solids : 11.2% Bituminous Coal : 7.6% Residual Fuel Oil : 3.1% Sludge Waste : 1.0%
Cape Gas Turbine	FPL Energy Cape LLC	Portland, ME	532 MWh	Dec 1969	Dec 2023	Distillate Fuel Oil
Robbins Lumber	Robbins Lumber Inc	Searsmont, ME	97 MWh	Dec 1980	Dec 2023	Distillate Fuel Oil
Rutland	Green Mountain Power Corp	Rutland City, VT	84 MWh	Nov 1962	Mar 2024	Distillate Fuel Oil
Signature Breads Chelsea	JDC 65R Owner, LLC	Chelsea, MA	2 MWh	Apr 2019	Dec 2023	Distillate Fuel Oil
West Water Street	City of Taunton	Taunton, MA	1 GWh	Dec 2017	Dec 2023	Distillate Fuel Oil
Norden 1-3	Third Taxing District of Norwalk	Norwalk, CT	42 MWh	May 2004	Dec 2022	Distillate Fuel Oil
Ascutney	Green Mountain Power Corp	Weatherfield, VT	192 MWh	Jul 1961	Feb 2025	Distillate Fuel Oil
Norwich WWTP	City of Norwich - (CT)	Norwich, CT	1 MWh	Apr 2006	Mar 2024	Distillate Fuel Oil
Stamford Health	Stamford Health Systems, Inc.	Stamford, CT	84 MWh	Dec 1983	Dec 2022	Distillate Fuel Oil
Water Treatment 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	332 MWh	Sep 2010	Feb 2025	Distillate Fuel Oil
Lebanon Pines 1 & 2	Connecticut Mun Elec Engy Coop	Lebanon, CT	577 MWh	Mar 2010	Dec 2023	Distillate Fuel Oil
LNG 1 & 2	Connecticut Mun Elec Engy Coop	Norwich, CT	573 MWh	Mar 2010	Dec 2023	Distillate Fuel Oil
Jewett City 1	Connecticut Mun Elec Engy Coop	Jewett City, CT	198 MWh	Jan 2010	Dec 2023	Distillate Fuel Oil
Gary Court 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	466 MWh	Jun 2010	Dec 2023	Distillate Fuel Oil
Fishers Island 1	Connecticut Mun Elec Engy Coop	Fisher's Island, NY	119 MWh	Nov 2010	Dec 2023	Distillate Fuel Oil
Fort Hill 1, 2, 3 & 4	Connecticut Mun Elec Engy Coop	Uncasville, CT	560 MWh	Jul 2010	Feb 2025	Distillate Fuel Oil
Bridge Street 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	562 MWh	Jun 2010	Dec 2023	Distillate Fuel Oil
Backus Microgrid Project	Connecticut Mun Elec Engy Coop	Norwich, CT	972 MWh	Jul 2014	Feb 2025	Distillate Fuel Oil
Burlington GT	City of Burlington Electric - (VT)	Burlington, VT	472 MWh	Aug 1971	Dec 2023	Distillate Fuel Oil
Waterside Power, LLC	Waterside Power, LLC	Stamford, CT	2 GWh	May 2003	Dec 2023	Distillate Fuel Oil
Wilkins Station	Town of Marblehead - (MA)	Marblehead, MA	78 MWh	Oct 1975	Dec 2023	Distillate Fuel Oil
Lost Nation	Granite Shore Power	Groveton, NH	428 MWh	Aug 1969	Dec 2023	Distillate Fuel Oil
Oak Bluffs Diesel Generating Facility	Vineyard Reliability LLC	Oak Bluffs, MA	1 GWh	Dec 1968	Dec 2023	Distillate Fuel Oil
West Tisbury Generating Facility	Vineyard Reliability LLC	West Tisbury, MA	2 GWh	Dec 1974	Dec 2023	Distillate Fuel Oil
VPPSA Project 10	Vermont Public Power Supply Authority	Swanton, VT	908 MWh	Apr 2010	Dec 2023	Distillate Fuel Oil
Front Street	City of Chicopee - (MA)	Chicopee, MA	476 MWh	Dec 1977	Dec 2023	Distillate Fuel Oil
Exelon Medway LLC	Constellation Power, Inc	Medway, MA	4 GWh	Jun 1970	Dec 2023	Distillate Fuel Oil
Exelon Framingham LLC	Constellation Power, Inc	Framingham, MA	792 MWh	Aug 1969	Dec 2023	Distillate Fuel Oil
Colchester 16	Green Mountain Power Corp	Colchester, VT	4 MWh	Sep 1965	Dec 2023	Distillate Fuel Oil
North Main Street	City of Norwich - (CT)	Norwich, CT	138 MWh	Jul 1972	May 2023	Distillate Fuel Oil
IXYS - Beverly	IXYS Integrated Circuits Division, LLC	Beverly, MA	23 MWh	Dec 1996	Dec 2023	Distillate Fuel Oil : 58.5% Natural Gas : 41.5%
Cherry Street	Town of Hudson - (MA)	Hudson, MA	417 MWh	Apr 1951	Dec 2023	Distillate Fuel Oil : 73.9% Natural Gas : 26.1%
Stony Brook	Massachusetts Mun Wholes Electric Co	Ludlow, MA	65 GWh	Oct 1981	Feb 2025	Distillate Fuel Oil : 74.0% Natural Gas : 26.0%
Outer Cape Community Battery	Eversource	Provincetown, MA	48 MWh	Nov 2022	Feb 2025	Electricity used for energy storage
Schiller	Granite Shore Power	Portsmouth, NH	517 MWh	Sep 1952	Feb 2025	Jet Fuel
White Lake	Granite Shore Power	Tamworth, NH	552 MWh	Jun 1968	Dec 2023	Jet Fuel
Branford	Connecticut Jet Power LLC	Branford, CT	68 MWh	Oct 1967	Dec 2023	Kerosene
Cos Cob	Connecticut Jet Power LLC	Greenwich, CT	1 GWh	Aug 1969	Dec 2023	Kerosene
M Street Jet	Massachusetts Bay Trans Auth	Boston, MA	275 MWh	Apr 1979	Dec 2023	Kerosene
Berlin 5	Green Mountain Power Corp	Berlin, VT	890 MWh	May 1972	Feb 2025	Kerosene
Torrington Terminal	Connecticut Jet Power LLC	Torrington, CT	67 MWh	Oct 1967	Dec 2023	Kerosene
South Meadow	NAES Corp	Hartford, CT	1 GWh	Jul 1970	Dec 2022	Kerosene
Franklin Drive	Connecticut Jet Power LLC	Torrington, CT	100 MWh	Oct 1968	Dec 2023	Kerosene
GenConn Middletown LLC	GenConn Middletown LLC	Middletown, CT	4 GWh	May 2011	Dec 2023	Kerosene : 83.6% Natural Gas : 16.4%
Devon Station	Devon Power LLC	Milford, CT	123 MWh	Dec 1984	Dec 2023	Kerosene : 89.2% Natural Gas : 10.8%
GenConn Devon LLC	GenConn Devon LLC	Milford, CT	2 GWh	May 2010	Dec 2023	Kerosene : 96.0% Natural Gas : 4.0%
GRS Fall River	Gas Recovery Systems Inc	Fall River, MA	121 MWh	Jun 2000	Dec 2022	Landfill Gas
Coventry Clean Energy Corporation	Washington Electric Coop - (VT)	Coventry, VT	52 GWh	Jun 2005	Dec 2023	Landfill Gas
Southbridge Landfill Gas-to-Energy	Southbridge Recycling and Disposal Park	Southbridge, MA	12 GWh	Sep 2011	Dec 2023	Landfill Gas
Nashua Plant	EPP Renewable Energy	Nashua, NH	14 GWh	Mar 1996	Dec 2023	Landfill Gas
Waste Management Crossroads LFGTE	WM Renewable Energy LLC	Norridgewock, ME	20 GWh	Feb 2009	Dec 2023	Landfill Gas
Ameresco Chicopee Energy	AMERESCO Chicopee Energy LLC	Chicopee, MA	14 GWh	Jan 2004	Dec 2023	Landfill Gas
Fitchburg Gas Recovery	WM Renewable Energy LLC	Westminster, MA	31 GWh	Sep 2007	Dec 2023	Landfill Gas
Moretown	EPP Renewable Energy	Waterbury, VT	5 GWh	Nov 2008	Dec 2023	Landfill Gas
New Milford Gas Recovery	WM Renewable Energy LLC	New Milford, CT	5 GWh	Apr 2008	Dec 2023	Landfill Gas
MM Taunton Energy	MM Taunton Energy LLC	Taunton, MA	8 GWh	Aug 1997	Dec 2023	Landfill Gas
Greater New Bedford LFG Utiliz. Facility	CommonWealth New Bedford Energy LLC	New Bedford, MA	20 GWh	Sep 2005	Dec 2023	Landfill Gas
Turnkey Landfill Gas Recovery	WM Renewable Energy LLC	Rochester, NH	45 GWh	Jan 1992	Dec 2023	Landfill Gas
Granby LFG	Industrial Power Services Corp.	Granby, MA	3 GWh	Aug 2001	Dec 2023	Landfill Gas
Ridgewood Providence Power	Rhode Island LFG Genco	Johnston, RI	10 GWh	Jul 2005	Dec 2023	Landfill Gas
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	189 GWh	Apr 2013	Feb 2025	Landfill Gas
UNH 7.9 MW Plant	Emcor Energy Services	Durham, NH	49 GWh	Aug 2006	Feb 2025	Landfill Gas : 74.1% Natural Gas : 24.4% Distillate Fuel Oil : 1.6%
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	2 TWh	May 2001	Feb 2025	Natural Gas
Masspower	Masspower	Indian Orchard, MA	609 GWh	Jun 1993	Dec 2023	Natural Gas
Wesleyan University Cogen 1	Wesleyan University	Middletown, CT	10 GWh	Jan 2009	Dec 2023	Natural Gas
Eastern Maine Medical Center	Eastern Maine Medical Center	Bangor, ME	31 GWh	Sep 2006	Feb 2025	Natural Gas
Subase Microgrid Project	Connecticut Mun Elec Engy Coop	Groton, CT	34 GWh	Nov 2022	Dec 2023	Natural Gas
Danbury Hospital Cogen Plant	Danbury Hospital	Danbury, CT	26 GWh	Oct 2011	Dec 2023	Natural Gas
Cellu Tissue	Dunn Paper East Hartford, LLC	East Hartford, CT	12 GWh	Apr 2009	Feb 2025	Natural Gas
Kimberly Clark-Unit 1,2,3	Kimberly-Clark Corporation	New Milford, CT	217 GWh	Mar 2008	Dec 2023	Natural Gas
One Patriot	Bloom Energy	Foxborough, MA	13 GWh	Nov 2019	Dec 2023	Natural Gas
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Feb 2025	Natural Gas
Berkshire Power	Berkshire Power Co LLC	Agawam, MA	70 GWh	Aug 1999	Dec 2023	Natural Gas
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	3 TWh	May 1998	Feb 2025	Natural Gas
Tiverton Power Plant	Tiverton Power LLC	Tiverton, RI	2 TWh	Feb 2000	Dec 2023	Natural Gas
Maine Independence Station	Casco Bay Energy Co LLC	Veazie, ME	937 GWh	Apr 2000	Dec 2023	Natural Gas
Millennium Power	Millennium Power Company, LLC	Charlton, MA	440 GWh	Mar 2001	Feb 2025	Natural Gas
Rumford Power LLC	Rumford Power	Rumford, ME	403 GWh	Jun 2000	Dec 2023	Natural Gas
CCSU Fuel Cell Project	New Britain Renewable Energy, LLC	New Britain, CT	10 GWh	Mar 2012	Dec 2023	Natural Gas
Central Power Plant	State of Rhode Island	Cranston, RI	19 GWh	Jul 1958	Feb 2025	Natural Gas
South Windsor Fuel Cell	South Energy Investments LLC	South Windsor, CT	39 GWh	Feb 2020	Dec 2023	Natural Gas
FDX010.0 FedEx Fuel Cell	2016 ESA Project Company, LLC	Middletown, CT	7 GWh	Aug 2018	Dec 2023	Natural Gas
UI RCP New Haven Fuel Cell	United Illuminating Co	New Haven, CT	15 GWh	Jul 2015	Feb 2025	Natural Gas
Bridgeport Fuel Cell, LLC	Bridgeport Fuel Cell, LLC	Bridgeport, CT	105 GWh	Nov 2013	Dec 2023	Natural Gas
Bradley Energy Center	Ameresco Select Inc	Windsor Locks, CT	13 GWh	Oct 2002	Dec 2023	Natural Gas
UB Fuel Cell	UB Fuel Cell	Bridgeport, CT	10 GWh	Mar 2015	Dec 2023	Natural Gas
Pepperidge Farm Bloomfield	Pepperidge Farm, Inc.- Bloomfield	Bloomfield, CT	16 GWh	Jul 2008	Dec 2023	Natural Gas
Frito Lay Incorporated	Frito Lay Incorporated Dayville	Dayville, CT	24 GWh	Feb 2009	Feb 2025	Natural Gas
Toray Plastic America's CHP Plant	Toray Plastics America	North Kingstown, RI	157 GWh	Dec 2002	Dec 2023	Natural Gas
Naval Sub Base New London Fuel Cell	Groton Station Fuel Cell, LLC	Groton, CT	34 GWh	Nov 2022	Dec 2023	Natural Gas
Hampton Facility	Foss Manufacturing Company LLC	Hampton, NH	22 GWh	Sep 1978	Feb 2025	Natural Gas
CCSU Co-Gen-STBY Gen	Central Connecticut State University	New Britain, CT	88 MWh	Sep 1993	Dec 2023	Natural Gas
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	133 GWh	Mar 2005	Feb 2025	Natural Gas
IBM Southbury	Bloom Energy	Southbury, CT	5 GWh	Oct 2014	Dec 2022	Natural Gas
Trinity College Fuel Cell	AEP Onsite Partners, LLC	Hartford, CT	9 GWh	Jul 2018	Dec 2023	Natural Gas
Clark University	Clark University	Worcester, MA	9 GWh	Dec 2012	Dec 2023	Natural Gas
Smith College Central Heating Plant	The Trustees of Smith College	Northampton, MA	15 GWh	Sep 2008	Dec 2023	Natural Gas

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	749.2 GWh	4
#25	Dominion Energy South Carolina, Inc.	26.2 TWh	85
#13	Duke Energy Carolinas	111.3 TWh	556
#17	Duke Energy Progress East	65.3 TWh	554
#51	Duke Energy Progress West	4.2 TWh	10
#24	Louisville Gas and Electric Company and Kentucky Utilities Company	34.1 TWh	20
#12	New York Independent System Operator	131.1 TWh	1,100
#1	PJM Interconnection, LLC	859.9 TWh	2,305
#29	South Carolina Public Service Authority	19.3 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	189.5 TWh	1,943
#8	Tennessee Valley Authority	158.9 TWh	170
#10	Florida Power & Light Co.	148.5 TWh	159
#12	New York Independent System Operator	131.1 TWh	1,100
#13	Duke Energy Carolinas	111.3 TWh	556
#15	ISO New England	103.6 TWh	1,487
#16	Bonneville Power Administration	82.9 TWh	158
#17	Duke Energy Progress East	65.3 TWh	554
#18	Salt River Project Agricultural Improvement and Power District	58.6 TWh	45
#19	PacifiCorp East	56.9 TWh	204