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
Merrimack	Granite Shore Power	Bow, NH	32 GWh	Nov 1960	Jul 2026	Bituminous Coal : 92.8% Jet Fuel : 7.1%
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%
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%
Cape Gas Turbine	FPL Energy Cape LLC	Portland, ME	752 MWh	Dec 1969	Dec 2025	Distillate Fuel Oil
Exelon Framingham LLC	Constellation Power, Inc	Framingham, MA	1 GWh	Aug 1969	Dec 2025	Distillate Fuel Oil
Exelon Medway LLC	Constellation Power, Inc	Medway, MA	4 GWh	Jun 1970	Dec 2025	Distillate Fuel Oil
Oak Bluffs Diesel Generating Facility	Vineyard Reliability LLC	Oak Bluffs, MA	3 GWh	Dec 1968	Sep 2025	Distillate Fuel Oil
Lost Nation	Granite Shore Power	Groveton, NH	416 MWh	Aug 1969	Dec 2025	Distillate Fuel Oil
Ascutney	Green Mountain Power Corp	Weatherfield, VT	406 MWh	Jul 1961	Jul 2026	Distillate Fuel Oil
VPPSA Project 10	Vermont Public Power Supply Authority	Swanton, VT	1 GWh	Apr 2010	Dec 2025	Distillate Fuel Oil
Colchester 16	Green Mountain Power Corp	Colchester, VT	310 MWh	Sep 1965	Dec 2025	Distillate Fuel Oil
Burlington GT	City of Burlington Electric - (VT)	Burlington, VT	684 MWh	Aug 1971	Dec 2025	Distillate Fuel Oil
West Tisbury Generating Facility	Vineyard Reliability LLC	West Tisbury, MA	5 GWh	Dec 1974	Sep 2025	Distillate Fuel Oil
Shrewsbury	Town of Shrewsbury - (MA)	Shrewsbury, MA	2 GWh	Oct 1969	Dec 2025	Distillate Fuel Oil
Water Treatment 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	394 MWh	Sep 2010	Jul 2026	Distillate Fuel Oil
Lebanon Pines 1 & 2	Connecticut Mun Elec Engy Coop	Lebanon, CT	374 MWh	Mar 2010	Dec 2025	Distillate Fuel Oil
LNG 1 & 2	Connecticut Mun Elec Engy Coop	Norwich, CT	382 MWh	Mar 2010	Dec 2025	Distillate Fuel Oil
Jewett City 1	Connecticut Mun Elec Engy Coop	Jewett City, CT	139 MWh	Jan 2010	Dec 2025	Distillate Fuel Oil
Gary Court 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	381 MWh	Jun 2010	Dec 2025	Distillate Fuel Oil
Front Street	City of Chicopee - (MA)	Chicopee, MA	1 GWh	Dec 1977	Dec 2025	Distillate Fuel Oil
Fishers Island 1	Connecticut Mun Elec Engy Coop	Fisher's Island, NY	129 MWh	Nov 2010	Dec 2025	Distillate Fuel Oil
Waterside Power, LLC	Waterside Power, LLC	Stamford, CT	2 GWh	May 2003	Dec 2025	Distillate Fuel Oil
Fort Hill 1, 2, 3 & 4	Connecticut Mun Elec Engy Coop	Uncasville, CT	653 MWh	Jul 2010	Jul 2026	Distillate Fuel Oil
Wilkins Station	Town of Marblehead - (MA)	Marblehead, MA	32 MWh	Oct 1975	Dec 2025	Distillate Fuel Oil
Bridge Street 1 & 2	Connecticut Mun Elec Engy Coop	Groton, CT	452 MWh	Jun 2010	Dec 2025	Distillate Fuel Oil
West Water Street	City of Taunton - (MA)	Taunton, MA	2 GWh	Dec 2017	Dec 2025	Distillate Fuel Oil
Backus Microgrid Project	Connecticut Mun Elec Engy Coop	Norwich, CT	828 MWh	Jul 2014	Jul 2026	Distillate Fuel Oil
Cherry Street	Town of Hudson - (MA)	Hudson, MA	320 MWh	Apr 1951	Dec 2025	Distillate Fuel Oil : 58.5% Natural Gas : 41.5%
MMWEC Simple Cycle Gas Turbine	Massachusetts Mun Wholes Electric Co	Peabody, MA	8 GWh	Jun 2024	Dec 2025	Distillate Fuel Oil : 69.0% Natural Gas : 31.0%
Stony Brook	Massachusetts Mun Wholes Electric Co	Ludlow, MA	133 GWh	Oct 1981	Jul 2026	Distillate Fuel Oil : 73.3% Natural Gas : 26.7%
Medway Grid	Medway Grid LLC	Medway, MA	18 GWh	-	Jun 2026	Electricity used for energy storage
NE Renewable Power Jonesboro	Stored Solar J&WE	Jonesboro, ME	16 MWh	Nov 1987	Jun 2025	Gaseous Propane : 66.7% Wood/Wood Waste Solids : 33.3%
White Lake	Granite Shore Power	Tamworth, NH	594 MWh	Jun 1968	Dec 2025	Jet Fuel
Schiller	Granite Shore Power	Portsmouth, NH	561 MWh	Sep 1952	Jul 2026	Jet Fuel
M Street Jet	Massachusetts Bay Trans Auth	Boston, MA	294 MWh	Apr 1979	Dec 2025	Kerosene
Franklin Drive	Connecticut Jet Power LLC	Torrington, CT	294 MWh	Oct 1968	Dec 2025	Kerosene
Berlin 5	Green Mountain Power Corp	Berlin, VT	1 GWh	May 1972	Jul 2026	Kerosene
Branford	Connecticut Jet Power LLC	Branford, CT	288 MWh	Oct 1967	Dec 2025	Kerosene
Torrington	Connecticut Jet Power LLC	Torrington, CT	277 MWh	Oct 1967	Dec 2025	Kerosene
Cos Cob	Connecticut Jet Power LLC	Greenwich, CT	2 GWh	Aug 1969	Dec 2025	Kerosene
GenConn Devon LLC	GenConn Devon LLC	Milford, CT	15 GWh	May 2010	Dec 2025	Kerosene : 75.4% Natural Gas : 24.6%
GenConn Middletown LLC	GenConn Middletown LLC	Middletown, CT	6 GWh	May 2011	Dec 2025	Kerosene : 77.4% Natural Gas : 22.6%
Granby LFG	Industrial Power Services Corp.	Granby, MA	2 GWh	Aug 2001	Dec 2025	Landfill Gas
Ridgewood Providence Power	Rhode Island LFG Genco	Johnston, RI	4 GWh	Jul 2005	Dec 2025	Landfill Gas
Coventry Clean Energy Corporation	Washington Electric Coop - (VT)	Coventry, VT	57 GWh	Jun 2005	Dec 2025	Landfill Gas
Southbridge Landfill Gas-to-Energy	Southbridge Recycling and Disposal Park	Southbridge, MA	10 GWh	Sep 2011	Dec 2025	Landfill Gas
New Milford Gas Recovery	WM Renewable Energy LLC	New Milford, CT	4 GWh	Apr 2008	Dec 2025	Landfill Gas
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	170 GWh	Apr 2013	Jul 2026	Landfill Gas
Waste Management Crossroads LFGTE	WM Renewable Energy LLC	Norridgewock, ME	22 GWh	Feb 2009	Dec 2025	Landfill Gas
Ameresco Chicopee Energy	AMERESCO Chicopee Energy LLC	Chicopee, MA	4 GWh	Jan 2004	Dec 2025	Landfill Gas
Fitchburg Gas Recovery	WM Renewable Energy LLC	Westminster, MA	32 GWh	Sep 2007	Dec 2025	Landfill Gas
MM Taunton Energy	MM Taunton Energy LLC	Taunton, MA	7 GWh	Aug 1997	Dec 2025	Landfill Gas
Nashua Plant	NextEra Renewable Fuels, LLC	Nashua, NH	13 GWh	Mar 1996	Dec 2025	Landfill Gas
Greater New Bedford LFG Utiliz. Facility	CommonWealth New Bedford Energy LLC	New Bedford, MA	13 GWh	Sep 2005	Dec 2025	Landfill Gas
Turnkey Landfill Gas Recovery	WM Renewable Energy LLC	Rochester, NH	39 GWh	Jan 1992	Dec 2025	Landfill Gas
UNH 7.9 MW Plant	Emcor Energy Services	Durham, NH	51 GWh	Aug 2006	Jul 2026	Landfill Gas : 52.2% Natural Gas : 45.1% Distillate Fuel Oil : 2.7%
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	Jul 2026	Natural Gas
Wellesley College Central Utility Plant	Wellesley College	Wellesley, MA	10 GWh	May 1985	Dec 2025	Natural Gas
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	4 TWh	Feb 2003	Jul 2026	Natural Gas
CCSU Co-Gen-STBY Gen	Central Connecticut State University	New Britain, CT	10 MWh	Sep 1993	Dec 2025	Natural Gas
Gillette SBMC	The Gillette Company	Boston, MA	59 GWh	Jan 1971	Jul 2026	Natural Gas
South Windsor Fuel Cell	South Energy Investments LLC	South Windsor, CT	37 GWh	Feb 2020	Dec 2025	Natural Gas
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	Jul 2026	Natural Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	3 TWh	Jan 2004	Jul 2026	Natural Gas
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Jul 2026	Natural Gas
CCSU Fuel Cell Project	New Britain Renewable Energy, LLC	New Britain, CT	7 GWh	Mar 2012	Dec 2025	Natural Gas
Dighton Power Plant	Dighton Power, LLC	Dighton, MA	276 GWh	Apr 1999	Dec 2025	Natural Gas
Tiverton Power Plant	Tiverton Power LLC	Tiverton, RI	2 TWh	Feb 2000	Dec 2025	Natural Gas
Kimberly Clark-Unit 1,2,3	Kimberly-Clark Corporation	New Milford, CT	233 GWh	Mar 2008	Dec 2025	Natural Gas
Cellu Tissue	Dunn Paper East Hartford, LLC	East Hartford, CT	11 GWh	Apr 2009	Jul 2026	Natural Gas
Subase Microgrid Project	Connecticut Mun Elec Engy Coop	Groton, CT	30 GWh	Nov 2022	Dec 2025	Natural Gas
Maine Independence Station	Casco Bay Energy Co LLC	Veazie, ME	1 TWh	Apr 2000	Dec 2025	Natural Gas
Rumford Power LLC	Rumford Power	Rumford, ME	793 GWh	Jun 2000	Dec 2025	Natural Gas
Millennium Power	Millennium Power Company, LLC	Charlton, MA	880 GWh	Mar 2001	Jul 2026	Natural Gas
UB Fuel Cell	UB Fuel Cell	Bridgeport, CT	10 GWh	Mar 2015	Dec 2025	Natural Gas
Salem Harbor Power Development LP	Salem Harbor Power Development LP	Salem, MA	1 TWh	Apr 2018	Jul 2026	Natural Gas
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	132 GWh	Mar 2005	Jul 2026	Natural Gas
Derby Fuel Cell	Derby Fuel Cell LLC	Derby, CT	110 GWh	Dec 2023	Dec 2025	Natural Gas
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	3 TWh	Apr 2001	Jul 2026	Natural Gas
Naval Sub Base New London Fuel Cell	Groton Station Fuel Cell, LLC	Groton, CT	30 GWh	Nov 2022	Dec 2025	Natural Gas
UDR Glastonbury Fuel Cell	UIL Distributed Resources, LLC	Glastonbury, CT	16 GWh	Jan 2016	Dec 2025	Natural Gas
Masspower	Masspower	Indian Orchard, MA	442 GWh	Jun 1993	Dec 2025	Natural Gas
HSCo CHP	Cartier Energy, LLC	Hartford, CT	28 GWh	Sep 2009	Dec 2025	Natural Gas
Fairfield University CHP Plant	Fairfield University	Fairfield, CT	23 GWh	Sep 2007	Dec 2025	Natural Gas
West Groton CHP	Hollingsworth & Vose Co West Groton	Groton, MA	21 GWh	Nov 2015	Dec 2025	Natural Gas
Indian Orchard Plant 1	Solutia Inc-Indian	Springfield, MA	10 GWh	Apr 1985	Jul 2026	Natural Gas
Clark University	Clark University	Worcester, MA	4 GWh	Dec 2012	Dec 2025	Natural Gas
UI RCP New Haven Fuel Cell	United Illuminating Co	New Haven, CT	21 GWh	Jul 2015	Jul 2026	Natural Gas
Pfizer Groton Fuel Cell	Groton Fuel Cell 1 LLC	Groton, CT	36 GWh	Sep 2016	Dec 2025	Natural Gas
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	3 TWh	May 2001	Jul 2026	Natural Gas
Hampton Facility	Foss Manufacturing Company LLC	Hampton, NH	28 GWh	Sep 1978	Jul 2026	Natural Gas
Pepperidge Farm Bloomfield	Pepperidge Farm, Inc.- Bloomfield	Bloomfield, CT	15 GWh	Jul 2008	Dec 2024	Natural Gas
Frito Lay Incorporated	Frito Lay Incorporated Dayville	Dayville, CT	25 GWh	Feb 2009	Jul 2026	Natural Gas
Bridgewater Complex Co-Generation Plant	Massachusetts Department of Correction	Bridgewater, MA	1 GWh	Oct 2015	Dec 2025	Natural Gas
One Patriot	Bloom Energy	Foxborough, MA	17 GWh	Nov 2019	Dec 2025	Natural Gas
Foxwoods CoGen	Foxwoods Resort Casino	Mashantucket, CT	11 GWh	May 2010	Dec 2025	Natural Gas
CPV Towantic Energy Center	CPV Towantic, LLC	Oxford, CT	6 TWh	Apr 2018	Jul 2026	Natural Gas
Trinity College Fuel Cell	Onsite Partners, LLC	Hartford, CT	11 GWh	Jul 2018	Dec 2025	Natural Gas
Wallingford Energy	Wallingford Energy LLC	Wallingford, CT	107 GWh	Jul 2001	Dec 2025	Natural Gas
UI RCP Woodbridge FC	United Illuminating Co	Woodbridge, CT	17 GWh	Nov 2016	Dec 2025	Natural Gas

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