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 #11 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
Merrimack	Granite Shore Power	Bow, NH	364 GWh	Nov 1960	Aug 2025	Bituminous Coal : 99.7%
Somerset Plant	Sappi Fine Paper North America-Somerset	Skowhegan, ME	575 GWh	Dec 1975	Aug 2025	Black Liquor : 45.9% Wood/Wood Waste Solids : 37.8% Natural Gas : 7.3% Tire-derived Fuels : 5.5% Residual Fuel Oil : 2.6% Sludge Waste : 0.8%
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	431 GWh	Dec 1989	Aug 2025	Black Liquor : 52.1% Tire-derived Fuels : 22.4% Wood/Wood Waste Solids : 13.7% Bituminous Coal : 7.7% Residual Fuel Oil : 3.1% Sludge Waste : 0.9%
Gary Court 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	422 MWh	Jun 2010	Dec 2024	Distillate Fuel Oil
Wilkins Station	Town of Marblehead - (MA)	Marblehead, MA	94 MWh	Oct 1975	Dec 2024	Distillate Fuel Oil
Cape Gas Turbine	FPL Energy Cape LLC	Portland, ME	111 MWh	Dec 1969	Dec 2024	Distillate Fuel Oil
Rutland	Green Mountain Power Corp	Rutland City, VT	84 MWh	Nov 1962	Mar 2024	Distillate Fuel Oil
Norwich WWTP	City of Norwich - (CT)	Norwich, CT	1 MWh	Apr 2006	Mar 2024	Distillate Fuel Oil
Water Treatment 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	425 MWh	Sep 2010	Aug 2025	Distillate Fuel Oil
Lebanon Pines 1 & 2	Connecticut Mun Elec Engy Coop	Lebanon, CT	471 MWh	Mar 2010	Dec 2024	Distillate Fuel Oil
LNG 1 & 2	Connecticut Mun Elec Engy Coop	Norwich, CT	494 MWh	Mar 2010	Dec 2024	Distillate Fuel Oil
Jewett City 1	Connecticut Mun Elec Engy Coop	Jewett City, CT	205 MWh	Jan 2010	Dec 2024	Distillate Fuel Oil
Burlington GT	City of Burlington Electric - (VT)	Burlington, VT	358 MWh	Aug 1971	Dec 2024	Distillate Fuel Oil
Fishers Island 1	Connecticut Mun Elec Engy Coop	Fisher's Island, NY	151 MWh	Nov 2010	Dec 2024	Distillate Fuel Oil
Fort Hill 1, 2, 3 & 4	Connecticut Mun Elec Engy Coop	Uncasville, CT	616 MWh	Jul 2010	Aug 2025	Distillate Fuel Oil
Waterside Power, LLC	Waterside Power, LLC	Stamford, CT	2 GWh	May 2003	Dec 2024	Distillate Fuel Oil
Bridge Street 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	458 MWh	Jun 2010	Dec 2024	Distillate Fuel Oil
Backus Microgrid Project	Connecticut Mun Elec Engy Coop	Norwich, CT	800 MWh	Jul 2014	Aug 2025	Distillate Fuel Oil
Exelon Framingham LLC	Constellation Power, Inc	Framingham, MA	273 MWh	Aug 1969	Dec 2024	Distillate Fuel Oil
Front Street	City of Chicopee - (MA)	Chicopee, MA	497 MWh	Dec 1977	Dec 2024	Distillate Fuel Oil
Exelon Medway LLC	Constellation Power, Inc	Medway, MA	2 GWh	Jun 1970	Dec 2024	Distillate Fuel Oil
Oak Bluffs Diesel Generating Facility	Vineyard Reliability LLC	Oak Bluffs, MA	2 GWh	Dec 1968	Dec 2024	Distillate Fuel Oil
Ascutney	Green Mountain Power Corp	Weatherfield, VT	228 MWh	Jul 1961	Jun 2025	Distillate Fuel Oil
West Tisbury Generating Facility	Vineyard Reliability LLC	West Tisbury, MA	3 GWh	Dec 1974	Dec 2024	Distillate Fuel Oil
Lost Nation	Granite Shore Power	Groveton, NH	422 MWh	Aug 1969	Dec 2024	Distillate Fuel Oil
Shrewsbury	Town of Shrewsbury - (MA)	Shrewsbury, MA	34 MWh	Oct 1969	Dec 2024	Distillate Fuel Oil
Robbins Lumber	Robbins Lumber Inc	Searsmont, ME	97 MWh	Dec 1980	Dec 2023	Distillate Fuel Oil
West Water Street	City of Taunton	Taunton, MA	2 GWh	Dec 2017	Dec 2024	Distillate Fuel Oil
Colchester 16	Green Mountain Power Corp	Colchester, VT	279 MWh	Sep 1965	Dec 2024	Distillate Fuel Oil
VPPSA Project 10	Vermont Public Power Supply Authority	Swanton, VT	1 GWh	Apr 2010	Dec 2024	Distillate Fuel Oil
Signature Breads Chelsea	JDC 65R Owner, LLC	Chelsea, MA	2 MWh	Apr 2019	Dec 2023	Distillate Fuel Oil
Indeck Jonesboro Energy Center	Stored Solar J&WE	Jonesboro, ME	16 MWh	Nov 1987	Jun 2025	Gaseous Propane : 66.7% Wood/Wood Waste Solids : 33.3%
Schiller	Granite Shore Power	Portsmouth, NH	578 MWh	Sep 1952	Aug 2025	Jet Fuel
White Lake	Granite Shore Power	Tamworth, NH	484 MWh	Jun 1968	Dec 2024	Jet Fuel
Cos Cob	Connecticut Jet Power LLC	Greenwich, CT	676 MWh	Aug 1969	Dec 2024	Kerosene
Branford	Connecticut Jet Power LLC	Branford, CT	109 MWh	Oct 1967	Dec 2024	Kerosene
Torrington Terminal	Connecticut Jet Power LLC	Torrington, CT	146 MWh	Oct 1967	Dec 2024	Kerosene
Franklin Drive	Connecticut Jet Power LLC	Torrington, CT	118 MWh	Oct 1968	Dec 2024	Kerosene
Berlin 5	Green Mountain Power Corp	Berlin, VT	1 GWh	May 1972	Aug 2025	Kerosene
M Street Jet	Massachusetts Bay Trans Auth	Boston, MA	457 MWh	Apr 1979	Dec 2024	Kerosene
GenConn Middletown LLC	GenConn Middletown LLC	Middletown, CT	6 GWh	May 2011	Dec 2024	Kerosene : 57.4% Natural Gas : 42.6%
GenConn Devon LLC	GenConn Devon LLC	Milford, CT	4 GWh	May 2010	Dec 2024	Kerosene : 90.3% Natural Gas : 9.7%
Moretown	NextEra Renewable Fuels, LLC	Waterbury, VT	5 GWh	Nov 2008	Dec 2023	Landfill Gas
Nashua Plant	NextEra Renewable Fuels, LLC	Nashua, NH	13 GWh	Mar 1996	Dec 2024	Landfill Gas
Waste Management Crossroads LFGTE	WM Renewable Energy LLC	Norridgewock, ME	18 GWh	Feb 2009	Dec 2024	Landfill Gas
MM Taunton Energy	MM Taunton Energy LLC	Taunton, MA	6 GWh	Aug 1997	Dec 2024	Landfill Gas
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	179 GWh	Apr 2013	Jul 2025	Landfill Gas
Greater New Bedford LFG Utiliz. Facility	CommonWealth New Bedford Energy LLC	New Bedford, MA	17 GWh	Sep 2005	Dec 2024	Landfill Gas
Turnkey Landfill Gas Recovery	WM Renewable Energy LLC	Rochester, NH	44 GWh	Jan 1992	Dec 2024	Landfill Gas
Fitchburg Gas Recovery	WM Renewable Energy LLC	Westminster, MA	32 GWh	Sep 2007	Dec 2024	Landfill Gas
New Milford Gas Recovery	WM Renewable Energy LLC	New Milford, CT	5 GWh	Apr 2008	Dec 2024	Landfill Gas
Granby LFG	Industrial Power Services Corp.	Granby, MA	3 GWh	Aug 2001	Dec 2024	Landfill Gas
Coventry Clean Energy Corporation	Washington Electric Coop - (VT)	Coventry, VT	49 GWh	Jun 2005	Dec 2024	Landfill Gas
Ameresco Chicopee Energy	AMERESCO Chicopee Energy LLC	Chicopee, MA	9 GWh	Jan 2004	Dec 2024	Landfill Gas
Southbridge Landfill Gas-to-Energy	Southbridge Recycling and Disposal Park	Southbridge, MA	12 GWh	Sep 2011	Dec 2024	Landfill Gas
Ridgewood Providence Power	Rhode Island LFG Genco	Johnston, RI	1 GWh	Jul 2005	Dec 2024	Landfill Gas
UNH 7.9 MW Plant	Emcor Energy Services	Durham, NH	55 GWh	Aug 2006	Aug 2025	Landfill Gas : 74.2% Natural Gas : 24.9% Distillate Fuel Oil : 0.9%
Danbury Hospital Cogen Plant	Danbury Hospital	Danbury, CT	28 GWh	Oct 2011	Dec 2024	Natural Gas
Dighton Power Plant	Dighton Power, LLC	Dighton, MA	531 GWh	Apr 1999	Dec 2024	Natural Gas
HSCo CHP	Cartier Energy, LLC	Hartford, CT	27 GWh	Sep 2009	Dec 2024	Natural Gas
Wesleyan University Cogen 1	Wesleyan University	Middletown, CT	7 GWh	Jan 2009	Dec 2024	Natural Gas
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	3 TWh	May 2001	Aug 2025	Natural Gas
One Patriot	Bloom Energy	Foxborough, MA	16 GWh	Nov 2019	Dec 2024	Natural Gas
Subase Microgrid Project	Connecticut Mun Elec Engy Coop	Groton, CT	43 GWh	Nov 2022	Dec 2024	Natural Gas
Cellu Tissue	Dunn Paper East Hartford, LLC	East Hartford, CT	12 GWh	Apr 2009	Aug 2025	Natural Gas
Kimberly Clark-Unit 1,2,3	Kimberly-Clark Corporation	New Milford, CT	219 GWh	Mar 2008	Dec 2024	Natural Gas
CCSU Fuel Cell Project	New Britain Renewable Energy, LLC	New Britain, CT	11 GWh	Mar 2012	Dec 2024	Natural Gas
South Windsor Fuel Cell	South Energy Investments LLC	South Windsor, CT	39 GWh	Feb 2020	Dec 2024	Natural Gas
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	3 TWh	Apr 2001	Aug 2025	Natural Gas
Wallingford Energy	Wallingford Energy LLC	Wallingford, CT	88 GWh	Jul 2001	Dec 2024	Natural Gas
CPV Towantic Energy Center	CPV Towantic, LLC	Oxford, CT	5 TWh	Apr 2018	Aug 2025	Natural Gas
Salem Harbor Power Development LP	Salem Harbor Power Development LP	Salem, MA	2 TWh	Apr 2018	Aug 2025	Natural Gas
Digital Fairfield	Bloom Energy	Trumbull, CT	10 GWh	May 2018	Jun 2024	Natural Gas
Bridgeport Fuel Cell, LLC	Bridgeport Fuel Cell, LLC	Bridgeport, CT	97 GWh	Nov 2013	Dec 2024	Natural Gas
Frito Lay Incorporated	Frito Lay Incorporated Dayville	Dayville, CT	24 GWh	Feb 2009	Aug 2025	Natural Gas
Derby Fuel Cell	Derby Fuel Cell LLC	Derby, CT	106 GWh	Dec 2023	Dec 2024	Natural Gas
Hartford Hospital Cogeneration	Cartier Energy, LLC	Hartford, CT	39 GWh	Jun 1988	Dec 2024	Natural Gas
Bridgewater Complex Co-Generation Plant	Massachusetts Department of Correction	Bridgewater, MA	1 GWh	Oct 2015	Dec 2024	Natural Gas
Boston Medical Center CHP Plant	Boston Medical Center	Boston, MA	14 GWh	Mar 2017	Dec 2024	Natural Gas
Masspower	Masspower	Indian Orchard, MA	476 GWh	Jun 1993	Dec 2024	Natural Gas
Bradley Energy Center	Ameresco Select Inc	Windsor Locks, CT	12 GWh	Oct 2002	Dec 2024	Natural Gas
Gillette SBMC	The Gillette Company	Boston, MA	55 GWh	Jan 1971	Aug 2025	Natural Gas
Indian Orchard Plant 1	Solutia Inc-Indian	Springfield, MA	137 MWh	Apr 1985	Aug 2025	Natural Gas
Clark University	Clark University	Worcester, MA	4 GWh	Dec 2012	Dec 2024	Natural Gas
Pratt & Whitney	United Technologies	East Hartford, CT	79 GWh	Dec 1991	Aug 2025	Natural Gas
Hampton Facility	Foss Manufacturing Company LLC	Hampton, NH	24 GWh	Sep 1978	Aug 2025	Natural Gas
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	Aug 2025	Natural Gas
Milford Power LP	Milford Power LLC	Milford, MA	253 GWh	Feb 1993	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
Wellesley College Central Utility Plant	Wellesley College	Wellesley, MA	889 MWh	May 1985	Dec 2024	Natural Gas
Naval Sub Base New London Fuel Cell	Groton Station Fuel Cell, LLC	Groton, CT	44 GWh	Nov 2022	Dec 2024	Natural Gas
Berkshire Power	Berkshire Power Co LLC	Agawam, MA	573 GWh	Aug 1999	Dec 2024	Natural Gas
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	3 TWh	May 1998	Aug 2025	Natural Gas
Tiverton Power Plant	Tiverton Power LLC	Tiverton, RI	2 TWh	Feb 2000	Dec 2024	Natural Gas
Maine Independence Station	Casco Bay Energy Co LLC	Veazie, ME	3 TWh	Apr 2000	Dec 2024	Natural Gas
Millennium Power	Millennium Power Company, LLC	Charlton, MA	447 GWh	Mar 2001	Aug 2025	Natural Gas
Rumford Power LLC	Rumford Power	Rumford, ME	638 GWh	Jun 2000	Dec 2024	Natural Gas
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Aug 2025	Natural Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	4 TWh	Jan 2004	Aug 2025	Natural Gas
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	Aug 2025	Natural Gas

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	699.8 GWh	4
#25	Dominion Energy South Carolina, Inc.	25.7 TWh	87
#13	Duke Energy Carolinas	112.7 TWh	565
#17	Duke Energy Progress East	64.2 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	870.3 TWh	2,465
#29	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	188.1 TWh	2,075
#9	Tennessee Valley Authority	161.5 TWh	204
#10	Florida Power & Light Co.	148.6 TWh	187
#12	New York Independent System Operator	131.6 TWh	1,211
#13	Duke Energy Carolinas	112.7 TWh	565
#15	ISO New England	105.5 TWh	1,577
#16	Bonneville Power Administration	80.5 TWh	163
#17	Duke Energy Progress East	64.2 TWh	559
#18	PacifiCorp East	61.0 TWh	216
#19	Salt River Project Agricultural Improvement and Power District	60.2 TWh	48