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	Jun 2025
Annual Generation	103.1 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 \| 57.2% Nuclear \| 24.7% Water \| 6.2% Other Fuel \| 4.5% Wind \| 3.7% 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
Cherry Street	Town of Hudson - (MA)	Hudson, MA	417 MWh	Apr 1951	Dec 2023	Distillate Fuel Oil : 73.9% Natural Gas : 26.1%
Oakdale Power Station	Massachusetts Water Res Auth	West Boylston, MA	12 GWh	Apr 1951	Dec 2023	Water
Hadley Falls	City of Holyoke Gas and Electric Dept.	Holyoke, MA	218 GWh	Dec 1951	Dec 2023	Water
Schiller	Granite Shore Power	Portsmouth, NH	536 MWh	Sep 1952	Mar 2025	Jet Fuel
Waterbury 22	Green Mountain Power Corp	Waterbury, VT	16 GWh	May 1953	Dec 2023	Water
Montville Station	NRG Montville Operations Inc	Uncasville, CT	36 GWh	Dec 1953	Dec 2023	Residual Fuel Oil : 65.3% Natural Gas : 33.4% Distillate Fuel Oil : 1.3%
Harris Hydro	Brookfield White Pine Hydro LLC	West Forks, ME	278 GWh	Dec 1953	Dec 2023	Water
Shepaug	FirstLight Power Resources Services LLC	Southbury, CT	163 GWh	Dec 1954	Dec 2023	Water
William F Wyman Hybrid	FPL Energy Wyman LLC	Yarmouth, ME	50 GWh	Dec 1956	Mar 2025	Residual Fuel Oil : 99.2% Distillate Fuel Oil : 0.8%
S C Moore	Great River Hydro, LLC	Littleton, NH	328 GWh	Dec 1956	Dec 2023	Water
Central Power Plant	State of Rhode Island	Cranston, RI	19 GWh	Jul 1958	Mar 2025	Natural Gas
Middletown	Middletown Power LLC	Middletown, CT	170 GWh	Sep 1958	Dec 2023	Natural Gas : 79.3% Residual Fuel Oil : 20.7%
Merrimack	Granite Shore Power	Bow, NH	317 GWh	Nov 1960	Mar 2025	Bituminous Coal : 99.6%
Bridgeport Station	Generation Bridge II Connecticut, LLC	Bridgeport, CT	3 TWh	Jul 1961	Mar 2025	Natural Gas : 98.6% Distillate Fuel Oil : 1.4%
Ascutney	Green Mountain Power Corp	Weatherfield, VT	192 MWh	Jul 1961	Feb 2025	Distillate Fuel Oil
Rutland	Green Mountain Power Corp	Rutland City, VT	84 MWh	Nov 1962	Mar 2024	Distillate Fuel Oil
Potter Station 2	Town of Braintree - (MA)	Braintree, MA	32 GWh	Jun 1963	Dec 2023	Natural Gas : 88.2% Distillate Fuel Oil : 11.8%
Bucksport Generation LLC	Bucksport Generation LLC	Bucksport, ME	14 GWh	Jun 1965	Mar 2025	Natural Gas : 98.3% Distillate Fuel Oil : 1.7%
Colchester 16	Green Mountain Power Corp	Colchester, VT	4 MWh	Sep 1965	Dec 2023	Distillate Fuel Oil
Cleary Flood Hybrid	City of Taunton	Taunton, MA	50 GWh	May 1966	Dec 2023	Natural Gas : 95.5% Distillate Fuel Oil : 4.5%
Tenth Street	City of Norwich - (CT)	Norwich, CT	4 GWh	Apr 1967	Dec 2023	Water
Torrington Terminal	Connecticut Jet Power LLC	Torrington, CT	67 MWh	Oct 1967	Dec 2023	Kerosene
Branford	Connecticut Jet Power LLC	Branford, CT	68 MWh	Oct 1967	Dec 2023	Kerosene
Canal	Canal Generating LLC	Sandwich, MA	305 GWh	May 1968	Mar 2025	Natural Gas : 73.0% Residual Fuel Oil : 24.5% Distillate Fuel Oil : 2.5%
White Lake	Granite Shore Power	Tamworth, NH	552 MWh	Jun 1968	Dec 2023	Jet Fuel
Franklin Drive	Connecticut Jet Power LLC	Torrington, CT	100 MWh	Oct 1968	Dec 2023	Kerosene
Oak Bluffs Diesel Generating Facility	Vineyard Reliability LLC	Oak Bluffs, MA	1 GWh	Dec 1968	Dec 2023	Distillate Fuel Oil
Cosgrove Intake and Power Station	Massachusetts Water Res Auth	Clinton, MA	5 GWh	Dec 1968	Dec 2023	Water
Mystic Generating Station	Constellation Mystic Power LLC	Charlestown, MA	2 TWh	May 1969	Mar 2024	Natural Gas
Cos Cob	Connecticut Jet Power LLC	Greenwich, CT	1 GWh	Aug 1969	Dec 2023	Kerosene
Exelon Framingham LLC	Constellation Power, Inc	Framingham, MA	792 MWh	Aug 1969	Dec 2023	Distillate Fuel Oil
Lost Nation	Granite Shore Power	Groveton, NH	428 MWh	Aug 1969	Dec 2023	Distillate Fuel Oil
Cape Gas Turbine	FPL Energy Cape LLC	Portland, ME	532 MWh	Dec 1969	Dec 2023	Distillate Fuel Oil
Dartmouth College Heating Plant	Dartmouth College	Hanover, NH	10 GWh	Dec 1969	Mar 2025	Residual Fuel Oil
Exelon Medway LLC	Constellation Power, Inc	Medway, MA	4 GWh	Jun 1970	Dec 2023	Distillate Fuel Oil
Gillette SBMC	The Gillette Company	Boston, MA	60 GWh	Jan 1971	Mar 2025	Natural Gas : 99.9%
Burlington GT	City of Burlington Electric - (VT)	Burlington, VT	472 MWh	Aug 1971	Dec 2023	Distillate Fuel Oil
Waters River	City of Peabody - (MA)	Peabody, MA	4 GWh	Nov 1971	Dec 2023	Natural Gas : 76.6% Distillate Fuel Oil : 23.4%
UMass Boston	UMass Boston	Dorchester, MA	659 MWh	Dec 1971	Dec 2023	Solar : 91.2% Distillate Fuel Oil : 8.8%
Berlin 5	Green Mountain Power Corp	Berlin, VT	927 MWh	May 1972	Mar 2025	Kerosene
Univ of Massachusetts Medical Center	University of Massachusetts Medical	Worcester, MA	68 GWh	Mar 1974	Dec 2023	Natural Gas : 97.4% Residual Fuel Oil : 2.4%
Framingham State University Plant	Framingham State University	Framingham, MA	74 MWh	May 1974	Mar 2025	Solar : 67.6% Distillate Fuel Oil : 32.4%
Newington	Granite Shore Power	Newington, NH	93 GWh	May 1974	Feb 2025	Natural Gas : 59.5% Residual Fuel Oil : 39.9% Distillate Fuel Oil : 0.5%
Deerfield 5	Great River Hydro, LLC	Florida, MA	63 GWh	Sep 1974	Dec 2023	Water
Fife Brook	Bear Swamp Power Company LLC	Florida, MA	33 GWh	Sep 1974	Dec 2023	Water
Rhode Island Hospital	Rhode Island Hospital	Providence, RI	9 GWh	Sep 1974	Mar 2025	Natural Gas : 89.5% Residual Fuel Oil : 10.5%
West Tisbury Generating Facility	Vineyard Reliability LLC	West Tisbury, MA	2 GWh	Dec 1974	Dec 2023	Distillate Fuel Oil
New Haven Harbor	Generation Bridge II Connecticut, LLC	New Haven, CT	45 GWh	Jun 1975	Feb 2025	Natural Gas : 53.7% Residual Fuel Oil : 33.6% Kerosene : 10.8% Distillate Fuel Oil : 1.9%
Wilkins Station	Town of Marblehead - (MA)	Marblehead, MA	78 MWh	Oct 1975	Dec 2023	Distillate Fuel Oil
Millstone	Dominion Energy Nuclear Conn Inc	Waterford, CT	17 TWh	Nov 1975	Mar 2025	Nuclear
Somerset Plant	Sappi Fine Paper North America-Somerset	Skowhegan, ME	534 GWh	Dec 1975	Mar 2025	Black Liquor : 46.9% Wood/Wood Waste Solids : 36.7% Tire-derived Fuels : 6.3% Natural Gas : 6.3% Residual Fuel Oil : 2.7% Sludge Waste : 1.0%
Front Street	City of Chicopee - (MA)	Chicopee, MA	476 MWh	Dec 1977	Dec 2023	Distillate Fuel Oil
Hampton Facility	Foss Manufacturing Company LLC	Hampton, NH	22 GWh	Sep 1978	Mar 2025	Natural Gas
M Street Jet	Massachusetts Bay Trans Auth	Boston, MA	275 MWh	Apr 1979	Dec 2023	Kerosene
Middlebury College	Middlebury College Biomass	Middlebury, VT	2 GWh	Dec 1979	Mar 2025	Wood/Wood Waste Solids : 72.8% Natural Gas : 27.1%
Medical Area Total Energy Plant	MATEP LLC	Boston, MA	339 GWh	Dec 1979	Dec 2023	Natural Gas : 99.7%
Robbins Lumber	Robbins Lumber Inc	Searsmont, ME	97 MWh	Dec 1980	Dec 2023	Distillate Fuel Oil
Blackstone/Tupperware	Blackstone Hydro Inc.	North Smithfield, RI	3 GWh	Dec 1980	Mar 2025	Water
Lawrence Hydroelectric Associates	Central Rivers Power US, LLC	Lawrence, MA	94 GWh	Jun 1981	Dec 2023	Water
China Mill Hydro	New Hampshire Hydro Associates	Allenstown, NH	4 GWh	Jun 1981	Dec 2023	Water
Stony Brook	Massachusetts Mun Wholes Electric Co	Ludlow, MA	65 GWh	Oct 1981	Mar 2025	Distillate Fuel Oil : 74.1% Natural Gas : 25.9%
International Paper Riley Hydro	Eagle Creek Renewable Energy, LLC	Jay, ME	6 GWh	Nov 1981	Dec 2023	Water
Texon Hydroelectric Project	Hitchcock Hydro, LLC	Russell, MA	6 GWh	Dec 1981	Dec 2023	Water
Brunswick Hydro	Brookfield White Pine Hydro LLC	Brunswick, ME	123 GWh	Feb 1982	Dec 2023	Water
Stevens Mills Dam	Eagle Creek Renewable Energy, LLC	Franklin, NH	10 GWh	May 1982	Dec 2023	Water
Smith (VT)	Green Mountain Power Corp	Bradford, VT	4 GWh	Nov 1982	Dec 2023	Water
Ottauquechee Hydro	Green Mountain Power Corp	N. Hartland, VT	4 GWh	Mar 1983	Dec 2023	Water
W K Sanders	Village of Morrisville - (VT)	Hyde Park, VT	915 MWh	Jun 1983	Dec 2023	Water
Penacook Lower Falls	Briar-Hydro Associates	Boscawen, NH	23 GWh	Jul 1983	Dec 2023	Water
Newfound Hydroelectric	Eagle Creek Renewable Energy, LLC	Bristol, NH	8 GWh	Nov 1983	Dec 2023	Water
J C McNeil	City of Burlington Electric - (VT)	Burlington, VT	202 GWh	May 1984	Mar 2025	Wood/Wood Waste Solids : 99.8%
Boltonville Hydro Associates	Boltonville Hydro Associates	Boltonville, VT	3 GWh	Jun 1984	Dec 2023	Water
East Barnet	Green Mountain Power Corp	Barnet, VT	6 GWh	Aug 1984	Dec 2023	Water
Lochmere Hydroelectric Plant	Eagle Creek Renewable Energy, LLC	Tilton, NH	4 GWh	Nov 1984	Dec 2023	Water
Clement Dam Hydro LLC	Eagle Creek Renewable Energy, LLC	Tilton, NH	12 GWh	Nov 1984	Dec 2023	Water
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	32 GWh	Dec 1984	Mar 2025	Water
Devon Station	Devon Power LLC	Milford, CT	123 MWh	Dec 1984	Dec 2023	Kerosene : 89.2% Natural Gas : 10.8%
Collins Facility	Elevate Power Management LLC	Wilbraham, MA	7 GWh	Feb 1985	Dec 2023	Water
Wheelabrator North Andover	Wheelabrator Environmental Systems	North Andover, MA	239 GWh	Apr 1985	Mar 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Wellesley College Central Utility Plant	Wellesley College	Wellesley, MA	480 MWh	May 1985	Dec 2023	Natural Gas
Gardiner	KEI (Maine) Power Management (III) LLC	Gardiner, ME	7 GWh	Jun 1985	Dec 2023	Water
Somersworth Lower Great Dam	Green Mountain Power Corp	Somersworth, NH	5 GWh	Jun 1985	Dec 2023	Water
EHC West Hopkinton	Green Mountain Power Corp	West Hopkinton, NH	4 GWh	Jun 1985	Dec 2023	Water
Wheelabrator Saugus	Wheelabrator Environmental Systems	Saugus, MA	231 GWh	Jul 1985	Mar 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Wrightsville Hydro Plant	Washington Electric Coop - (VT)	Montpelier, VT	2 GWh	Aug 1985	Dec 2023	Water
Lockwood Hydroelectric Facility	Merimil Ltd Partnership	Waterville, ME	24 GWh	Sep 1985	Dec 2023	Water
Gregg Falls	Eagle Creek Renewable Energy, LLC	Goffstown, NH	14 GWh	Nov 1985	Dec 2023	Water
Mine Falls Generating Station	City of Nashua, NH	Nashua, NH	20 GWh	Nov 1985	Dec 2023	Water
Pembroke Hydro	Eagle Creek Renewable Energy, LLC	Suncook, NH	15 GWh	Nov 1985	Dec 2023	Water
Mechanic Falls	KEI (Maine) Power Management (IV) LLC	Mechanic Falls, ME	3 GWh	Mar 1986	Dec 2023	Water
Barker Lower	KEI (Maine) Power Management (III) LLC	Auburn, ME	8 GWh	Mar 1986	Dec 2023	Water
Goodwin Hydroelectric	Metropolitan Dist of Hartford	W. Hartland, CT	13 GWh	Mar 1986	Dec 2023	Water
Salmon Falls	Green Mountain Power Corp	South Berwick, ME	5 GWh	Jun 1986	Dec 2023	Water
Pittsfield Hydro	KEI (Maine) Power Management (II) LLC	Burnham, ME	6 GWh	Jun 1986	Dec 2023	Water
Rollinsford	Green Mountain Power Corp	Rollinsford, NH	4 GWh	Sep 1986	Dec 2023	Water
Errol Hydroelectric Project	Errol Hydroelectric Co LLC	Errol, NH	16 GWh	Oct 1986	Dec 2023	Water
Pontook Hydro Facility	Pontook Operating LP	Dummer, NH	58 GWh	Nov 1986	Dec 2023	Water
Penacook Upper Falls Hydro	Briar-Hydro Associates	Penacook, NH	17 GWh	Nov 1986	Dec 2023	Water
Pumpkin Hill	KEI (Maine) Power Management (II) LLC	Lowell, ME	5 GWh	Feb 1987	Dec 2023	Water
Upper Barker	KEI (Maine) Power Management (III) LLC	Auburn, ME	7 GWh	Apr 1987	Dec 2023	Water

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	734.7 GWh	4
#25	Dominion Energy South Carolina, Inc.	26.1 TWh	85
#13	Duke Energy Carolinas	111.4 TWh	556
#17	Duke Energy Progress East	65.0 TWh	554
#52	Duke Energy Progress West	4.1 TWh	10
#24	Louisville Gas and Electric Company and Kentucky Utilities Company	33.8 TWh	20
#12	New York Independent System Operator	130.6 TWh	1,100
#1	PJM Interconnection, LLC	858.1 TWh	2,305
#29	South Carolina Public Service Authority	19.2 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	190.4 TWh	1,943
#8	Tennessee Valley Authority	158.8 TWh	170
#10	Florida Power & Light Co.	148.6 TWh	159
#12	New York Independent System Operator	130.6 TWh	1,100
#13	Duke Energy Carolinas	111.4 TWh	556
#15	ISO New England	103.1 TWh	1,487
#16	Bonneville Power Administration	82.1 TWh	158
#17	Duke Energy Progress East	65.0 TWh	554
#18	Salt River Project Agricultural Improvement and Power District	58.7 TWh	45
#19	PacifiCorp East	57.3 TWh	204