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	Mar 2026
Annual Generation	110.5 TWh
Power Plants	1,577
Utilities	819
Ranked #15 out of 65 in terms of net annual generation
Ranked #11 out of 54 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 55.9% Nuclear \| 25.1% Water \| 4.6% Other Fuel \| 4.3% Wind \| 4.3% Solar \| 1.4% Coal \| 0.1%

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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
Rhode Island Hospital	Rhode Island Hospital	Providence, RI	40 GWh	Sep 1974	Dec 2025	Natural Gas : 97.2% Residual Fuel Oil : 2.8%
Cape Cod Air Force Station - 6 SWS	US Air Force	Sagamore, MA	7 GWh	Dec 2013	Dec 2025	Wind
Frito Lay Incorporated	Frito Lay Incorporated Dayville	Dayville, CT	25 GWh	Feb 2009	Dec 2025	Natural Gas
Wheelabrator Bridgeport	Wheelabrator Environmental Systems	Bridgeport, CT	471 GWh	Jun 1988	Dec 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Wheelabrator Saugus	Wheelabrator Environmental Systems	Saugus, MA	185 GWh	Jul 1985	Dec 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Indian Orchard Plant 1	Solutia Inc-Indian	Springfield, MA	2 GWh	Apr 1985	Dec 2025	Natural Gas
Wheelabrator Millbury Facility	Wheelabrator Environmental Systems	Millbury, MA	319 GWh	Aug 1987	Dec 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Wheelabrator North Andover	Wheelabrator Environmental Systems	North Andover, MA	240 GWh	Apr 1985	Dec 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	424 GWh	Dec 1989	Dec 2025	Black Liquor : 51.6% Tire-derived Fuels : 22.3% Wood/Wood Waste Solids : 15.8% Bituminous Coal : 7.5% Residual Fuel Oil : 2.0% Sludge Waste : 0.8%
Wheelabrator Concord Facility	Wheelabrator Environmental Systems	Concord, NH	94 GWh	Mar 1989	Dec 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Hancock Wind Plant	Onward Energy	T22 MD, ME	120 GWh	Nov 2016	Dec 2025	Wind
Algonquin Windsor Locks	Ahlstrom Power Windsor Locks LLC	Windsor Locks, CT	127 GWh	Dec 1989	Dec 2025	Natural Gas : 98.3% Distillate Fuel Oil : 1.7%
Covanta Southeastern Connecticut Company	Covanta Southeastern Connecticut Company	Preston, CT	116 GWh	Nov 1991	Dec 2025	Non-biogenic Municipal Solid Waste : 54.1% Biogenic Municipal Solid Waste : 44.3% Distillate Fuel Oil : 1.7%
Pepperell Hydro Power Plant	Eagle Creek Renewable Energy, LLC	Pepperell, MA	4 GWh	Dec 1919	Dec 2025	Water
Covanta Haverhill	Ogden Projects Inc-Haverhill	Haverhill, MA	198 GWh	Apr 1989	Dec 2025	Non-biogenic Municipal Solid Waste : 51.9% Biogenic Municipal Solid Waste : 42.4% Distillate Fuel Oil : 5.7%
Fusion Solar Center LLC	Fusion Solar Centre, L.L.C	Baltic, CT	39 GWh	Feb 2018	Dec 2025	Solar
Deer Island Treatment Plant	Massachusetts Wtr Rauth-Deer I	Winthrop, MA	33 GWh	Jul 1995	Dec 2025	Other Biomass Gas : 83.7% Distillate Fuel Oil : 11.5% Wind : 3.0% Solar : 1.9%
Covanta Bristol Energy	Covanta Bristol Inc	Bristol, CT	109 GWh	Nov 1987	Dec 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Jericho Power	Jericho Power LLC	Berlin, NH	23 GWh	Dec 2015	Dec 2025	Wind
Central Power Plant	State of Rhode Island	Cranston, RI	19 GWh	Jul 1958	Dec 2025	Natural Gas : 97.7% Distillate Fuel Oil : 2.3%
Woods Hill Solar	Woods Hill Solar, LLC	Pomfret, CT	24 GWh	Nov 2018	Dec 2025	Solar
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	135 GWh	Jun 1990	Dec 2025	Natural Gas : 98.7% Distillate Fuel Oil : 1.3%
MMWAC Resource Recovery Facility	Maine Waste to Energy	Auburn, ME	10 GWh	May 1992	Dec 2025	Non-biogenic Municipal Solid Waste : 54.0% Biogenic Municipal Solid Waste : 44.2% Natural Gas : 1.7%
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	31 GWh	Dec 1984	Dec 2025	Water
University Solar, LLC	AES Distributed Energy	West Greenwich, RI	28 GWh	Nov 2019	Dec 2025	Solar
Sanford Solar	Sanford Airport Solar, LLC	Sanford, ME	86 GWh	Oct 2020	Dec 2025	Solar
Somerset Plant	Sappi Fine Paper North America-Somerset	Skowhegan, ME	552 GWh	Dec 1975	Dec 2025	Black Liquor : 45.9% Wood/Wood Waste Solids : 37.6% Natural Gas : 7.7% Tire-derived Fuels : 4.4% Residual Fuel Oil : 3.4% Sludge Waste : 0.7%
Blackstone/Tupperware	Blackstone Hydro Inc.	North Smithfield, RI	2 GWh	Dec 1980	Dec 2025	Water
Regional Waste Systems	Ecomaine	Portland, ME	89 GWh	May 1988	Dec 2025	Non-biogenic Municipal Solid Waste : 54.6% Biogenic Municipal Solid Waste : 44.7% Natural Gas : 0.8%
Coolidge Solar 1, LLC	Coolidge Solar I, LLC	Ludlow, VT	24 GWh	Nov 2018	Dec 2025	Solar
Bucksport Generation LLC	Bucksport Generation LLC	Bucksport, ME	11 GWh	Jun 1965	Dec 2025	Natural Gas : 97.5% Distillate Fuel Oil : 2.5%
Dept of Corrections NCCI Wind	Dept of Corrections NCCI Wind	Gardner, MA	5 GWh	Oct 2013	Dec 2025	Wind
SEMASS Resource Recovery	SEMASS Partnership	West Wareham, MA	567 GWh	Jun 1988	Dec 2025	Non-biogenic Municipal Solid Waste : 54.0% Biogenic Municipal Solid Waste : 44.2% Natural Gas : 1.6%
UCONN Cogen Facility	University of Connecticut	Storrs, CT	121 GWh	Feb 2006	Nov 2025	Natural Gas : 98.6% Distillate Fuel Oil : 1.4%
Merrimack	Granite Shore Power	Bow, NH	341 GWh	Nov 1960	Nov 2025	Bituminous Coal : 99.6%
Schiller	Granite Shore Power	Portsmouth, NH	697 MWh	Sep 1952	Nov 2025	Jet Fuel
Berlin 5	Green Mountain Power Corp	Berlin, VT	1 GWh	May 1972	Nov 2025	Kerosene
Pratt & Whitney	United Technologies	East Hartford, CT	84 GWh	Dec 1991	Oct 2025	Natural Gas
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%
Derby Fuel Cell	Derby Fuel Cell LLC	Derby, CT	106 GWh	Dec 2023	Dec 2024	Natural Gas
Syncarpha Leicester Hybrid CSG	Syncarpha Leicester, LLC	Leicester, MA	5 GWh	May 2021	Dec 2024	Solar
Tanglewood Circle Solar 1 LLC	Tanglewood Circle Solar 1 LLC	Becket, MA	8 GWh	Oct 2018	Dec 2024	Solar
Tolland Solar NG LLC	NuGen Capital Management	Tolland, MA	5 GWh	Sep 2014	Dec 2024	Solar
Plainfield Community Solar LLC	Plainfield Solar LLC	Plainfield, MA	3 GWh	Jan 2019	Dec 2024	Solar
GD West Greenwich Victory I, LLC	GD West Greenwich Victory I, LLC	West Greenwich, RI	3 GWh	Nov 2019	Dec 2024	Solar
GD Richmond Buttonwoods I, LLC	GD Richmond Buttonwoods I, LLC	Richmond, RI	2 GWh	Nov 2019	Dec 2024	Solar
Kearsarge Wilmington	Kearsarge Wilmington LLC	Wilmington, MA	2 GWh	Nov 2017	Dec 2024	Solar
Kearsarge SKSC2 LLC	Kearsarge SKSC2 LLC	South Kingstown, RI	6 GWh	Sep 2018	Dec 2024	Solar
Kearsarge Montague	Kearsarge Montague LLC	Montague, MA	7 GWh	May 2018	Dec 2024	Solar
Kearsarge Uxbridge	Kearsarge Uxbridge LLC	Uxbridge, MA	3 GWh	Aug 2018	Dec 2024	Solar
Kearsarge SKSC1 LLC	Kearsarge SKSC1 LLC	South Kingstown, RI	6 GWh	Sep 2018	Dec 2024	Solar
Kearsarge GB	Kearsarge GB LLC	Great Barrington, MA	3 GWh	Jul 2018	Dec 2024	Solar
Winchendon Landfill Solar	Onyx Asset Services Group	Winchendon, MA	3 GWh	Sep 2018	Dec 2024	Solar
Westminster	MN8 Energy LLC	Westminster, VT	3 GWh	Nov 2016	Dec 2024	Solar
BWC Pocasset River	BWC Pocasset River, LLC	Wareham, MA	2 GWh	Nov 2018	Dec 2024	Solar
BWC Harlow Brook	BWC Harlow Brook, LLC	Wareham, MA	2 GWh	Nov 2018	Dec 2024	Solar
BWC Wareham River	BWC Wareham River, LLC	Wareham, MA	2 GWh	Nov 2018	Dec 2024	Solar
BWC Gibbs Brook	BWC Gibbs Brook, LLC	Wareham, MA	6 GWh	Nov 2018	Dec 2024	Solar
BWC Origination 18	BWC Origination 18, LLC	Mattapoisett, MA	8 GWh	Nov 2018	Dec 2024	Solar
Barre Solar III LLC	AES Distributed Energy	Barre, MA	1 GWh	Feb 2018	Dec 2024	Solar
Dynamic - Walpole	AES Distributed Energy	Walpole, MA	3 GWh	May 2017	Dec 2024	Solar
North Stonington Solar Center, LLC	Adapture Renewables, Inc.	North Stonington, CT	30 GWh	Sep 2022	Dec 2024	Solar
Plymouth Solar	NSTAR Electric Company	Plymouth, MA	1 GWh	May 2018	Dec 2024	Solar
Pittsfield 44 - M&W PV	NSTAR Electric Company	Pittsfield, MA	2 GWh	Jul 2018	Dec 2024	Solar
Westminster Renewables, LLC CSG	Westminster Renewables, LLC	Westminster, MA	2 GWh	Sep 2018	Dec 2024	Solar
Monson Solar, LLC	Monson Solar, LLC	Monson, MA	3 GWh	Jul 2017	Dec 2024	Solar
Williamsburg	AES Distributed Energy	Goshen, MA	7 GWh	Jun 2019	Dec 2024	Solar
Dudley Solar CSG	Dudley Solar, LLC	Dudley, MA	3 GWh	Jul 2017	Dec 2024	Solar
Ashby Solar, LLC CSG	Ashby Solar, LLC	Fitchburg, MA	3 GWh	Jun 2018	Dec 2024	Solar
Griffin Road Solar, LLC CSG	Griffin Road Solar, LLC	Charlton, MA	3 GWh	Feb 2018	Dec 2024	Solar
East Bridgewater Solar	Altus Power America Management, LLC	East Bridgewater, MA	3 GWh	Oct 2017	Dec 2024	Solar
Hadley 2 Solar, LLC CSG	Hadley 2 Solar, LLC	Hadley, MA	3 GWh	Nov 2016	Dec 2024	Solar
Palmer	AES Distributed Energy	Palmer, MA	6 GWh	Sep 2019	Dec 2024	Solar
WED GW Solar, LLC	CleanCapital Holdings	Lincoln, RI	4 GWh	Dec 2018	Dec 2024	Solar
WED Shun III, LLC	WED Shun III, LLC	Johnston, RI	7 GWh	Dec 2018	Dec 2024	Wind
WED Shun II, LLC	WED Shun II, LLC	Johnston, RI	6 GWh	Dec 2018	Dec 2024	Wind
WED Plainfield, LLC	WED Plainfield, LLC	Johnston, RI	6 GWh	Dec 2018	Dec 2024	Wind
WED Plainfield III, LLC	WED Plainfield III, LLC	Johnston, RI	6 GWh	Dec 2018	Dec 2024	Wind
WED Plainfield II, LLC	WED Plainfield II, LLC	Johnston, RI	6 GWh	Dec 2018	Dec 2024	Wind
Ludlow Site 72 - Conti	NSTAR Electric Company	Ludlow, MA	2 GWh	Jul 2018	Dec 2024	Solar
East Springfield Solar PV	NSTAR Electric Company	Springfield, MA	2 GWh	Sep 2018	Dec 2024	Solar
Hatfield Solar PV	NSTAR Electric Company	Hatfield, MA	6 GWh	Nov 2018	Dec 2024	Solar
Sunderland Solar PV	NSTAR Electric Company	Sunderland, MA	2 GWh	Aug 2018	Dec 2024	Solar
Town of Branford	Tesla Inc.	Branford, CT	2 GWh	May 2018	Dec 2024	Solar
Hampden Solar PV	NSTAR Electric Company	Hampden, MA	6 GWh	Oct 2019	Dec 2024	Solar
Springfield Solar PV	NSTAR Electric Company	Springfield, MA	6 GWh	Dec 2018	Dec 2024	Solar
Southampton Solar PV	NSTAR Electric Company	Southampton, MA	3 GWh	Jan 2019	Dec 2024	Solar
Savoy Solar PV	NSTAR Electric Company	Savoy, MA	3 GWh	Jan 2019	Dec 2024	Solar
Hinsdale Solar PV	NSTAR Electric Company	Hinsdale, MA	3 GWh	Dec 2018	Dec 2024	Solar
Greenfield Solar PV	NSTAR Electric Company	Greenfield, MA	3 GWh	Dec 2018	Dec 2024	Solar
East Longmeadow Solar PV	NSTAR Electric Company	East Longmeadow, MA	5 GWh	Sep 2019	Dec 2024	Solar
Wareham Solar PV	NSTAR Electric Company	Wareham, MA	1 GWh	Nov 2018	Dec 2024	Solar
Adams Solar	Ecos Energy LLC	Lebanon, CT	2 GWh	Feb 2018	Dec 2024	Solar
Hamilton Solar	Ecos Energy LLC	Lebanon, CT	2 GWh	Feb 2018	Dec 2024	Solar
Jefferson Solar (CT)	Ecos Energy LLC	Lebanon, CT	2 GWh	Dec 2017	Dec 2024	Solar
Wilson Solar (CT)	Ecos Energy LLC	Lebanon, CT	2 GWh	Feb 2018	Dec 2024	Solar
Franklin Solar (CT)	Ecos Energy LLC	Lebanon, CT	2 GWh	Feb 2018	Dec 2024	Solar
Saint Albans Solar	Cypress Creek Renewables	Georgia, VT	8 GWh	Sep 2018	Dec 2024	Solar
Toray Plastic America's CHP Plant	Toray Plastics America	North Kingstown, RI	147 GWh	Dec 2002	Dec 2024	Natural Gas
AIS Solar Project	Terraform Arcadia	Leominster, MA	3 GWh	Nov 2016	Dec 2024	Solar

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#60	Alcoa Power Generating, Inc. - Yadkin Division	610.0 GWh	4
#25	Dominion Energy South Carolina, Inc.	25.6 TWh	87
#13	Duke Energy Carolinas	112.4 TWh	565
#17	Duke Energy Progress East	64.5 TWh	559
#52	Duke Energy Progress West	4.3 TWh	10
#23	Louisville Gas and Electric Company and Kentucky Utilities Company	34.3 TWh	25
#12	New York Independent System Operator	134.0 TWh	1,211
#1	PJM Interconnection, LLC	879.0 TWh	2,465
#29	South Carolina Public Service Authority	18.4 TWh	34
#59	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	179.9 TWh	2,075
#9	Tennessee Valley Authority	162.4 TWh	204
#10	Florida Power & Light Co.	150.5 TWh	187
#12	New York Independent System Operator	134.0 TWh	1,211
#13	Duke Energy Carolinas	112.4 TWh	565
#15	ISO New England	110.5 TWh	1,577
#16	Bonneville Power Administration	85.9 TWh	163
#17	Duke Energy Progress East	64.5 TWh	559
#18	PacifiCorp East	60.9 TWh	216
#19	Salt River Project Agricultural Improvement and Power District	60.3 TWh	48