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
Founders Homestead Farms Solar	AES Distributed Energy	Portsmouth, RI	6 GWh	Nov 2019	Mar 2025	Solar
Searsburg Wind Turbine	Green Mountain Power Corp	Searsburg, VT	11 GWh	May 1997	Mar 2025	Wind
Kibby Wind Facility	Helix Maine Wind Development, LLC	Chain of Ponds, ME	269 GWh	Sep 2009	Mar 2025	Wind
Kleen Energy Systems Project	Kleen Energy Systems, LLC	Middletown, CT	3 TWh	Jun 2011	Mar 2025	Natural Gas : 99.2% Distillate Fuel Oil : 0.8%
Deer Island Treatment Plant	Massachusetts Wtr Rauth-Deer I	Winthrop, MA	35 GWh	Jul 1995	Mar 2025	Other Biomass Gas : 78.7% Distillate Fuel Oil : 12.5% Water : 4.8% Wind : 2.3% Solar : 1.8%
Millennium Power	Millennium Power Company, LLC	Charlton, MA	465 GWh	Mar 2001	Mar 2025	Natural Gas
General Electric Aircraft Engines	General Electric Aircraft Engines	Lynn, MA	2 GWh	Dec 1947	Mar 2025	Solar
Antrim Wind	Antrim Wind Energy LLC	Antrim, NH	75 GWh	Nov 2019	Mar 2025	Wind
Lempster Wind LLC	Avangrid Renewables LLC	Lempster, NH	65 GWh	Nov 2008	Mar 2025	Wind
Hampton Facility	Foss Manufacturing Company LLC	Hampton, NH	22 GWh	Sep 1978	Mar 2025	Natural Gas
CPV Towantic Energy Center	CPV Towantic, LLC	Oxford, CT	6 TWh	Apr 2018	Mar 2025	Natural Gas
GMP Solar/Storage-Milton Hybrid	Green Mountain Power Corp	Milton, VT	8 GWh	Aug 2019	Mar 2025	Solar : 93.4% Electricity used for energy storage : 6.6%
GMP Solar/Storage-Ferrisburgh Hybrid	Green Mountain Power Corp	Ferrisburgh, VT	9 GWh	Aug 2019	Mar 2025	Solar : 92.6% Electricity used for energy storage : 7.4%
GMP Solar/Storage-Essex Hybrid	Green Mountain Power Corp	Essex, VT	8 GWh	Aug 2019	Mar 2025	Solar : 92.6% Electricity used for energy storage : 7.4%
Passadumkeag Windpark LLC	Southern Power Co	Greenbush, ME	132 GWh	Jun 2016	Mar 2025	Wind
Newington	Essential Power Operating Services, LLC	Newington, NH	2 TWh	Sep 2002	Mar 2025	Natural Gas : 95.2% Distillate Fuel Oil : 4.8%
Pepperell Hydro Power Plant	Eagle Creek Renewable Energy, LLC	Pepperell, MA	4 GWh	Dec 1919	Mar 2025	Water
Fore River Generating Station	Calpine Fore River Energy Center, LLC	North Weymouth, MA	3 TWh	Jul 2003	Mar 2025	Natural Gas : 95.4% Distillate Fuel Oil : 4.6%
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	3 TWh	Apr 2001	Mar 2025	Natural Gas
Covanta Southeastern Connecticut Company	Covanta Southeastern Connecticut Company	Preston, CT	112 GWh	Nov 1991	Mar 2025	Non-biogenic Municipal Solid Waste : 54.2% Biogenic Municipal Solid Waste : 44.4% Distillate Fuel Oil : 1.4%
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	2 TWh	May 2001	Mar 2025	Natural Gas
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	Mar 2025	Natural Gas
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	3 TWh	Feb 2003	Mar 2025	Natural Gas
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	430 GWh	Dec 1989	Mar 2025	Black Liquor : 53.8% Tire-derived Fuels : 22.8% Wood/Wood Waste Solids : 11.8% Bituminous Coal : 7.4% Residual Fuel Oil : 3.1% Sludge Waste : 1.0%
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	Mar 2025	Natural Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	4 TWh	Jan 2004	Mar 2025	Natural Gas
UI RCP Bridgeport Seaside	United Illuminating Co	Bridgeport, CT	20 GWh	Oct 2015	Mar 2025	Natural Gas : 88.4% Solar : 11.6%
UI RCP New Haven Fuel Cell	United Illuminating Co	New Haven, CT	14 GWh	Jul 2015	Mar 2025	Natural Gas
Algonquin Windsor Locks	Algonquin Windsor Locks LLC	Windsor Locks, CT	120 GWh	Dec 1989	Mar 2025	Natural Gas : 99.9%
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Mar 2025	Natural Gas
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	187 GWh	Apr 2013	Mar 2025	Landfill Gas
Ascutney	Green Mountain Power Corp	Weatherfield, VT	192 MWh	Jul 1961	Feb 2025	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%
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	31 GWh	Jun 1990	Feb 2025	Natural Gas : 94.6% Distillate Fuel Oil : 5.4%
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%
Southbridge Solar	AES Distributed Energy	Southbridge, MA	3 GWh	Feb 2016	Feb 2025	Solar
Mystic Generating Station	Constellation Mystic Power LLC	Charlestown, MA	2 TWh	May 1969	Mar 2024	Natural Gas
Norwich WWTP	City of Norwich - (CT)	Norwich, CT	1 MWh	Apr 2006	Mar 2024	Distillate Fuel Oil
Rutland	Green Mountain Power Corp	Rutland City, VT	84 MWh	Nov 1962	Mar 2024	Distillate Fuel Oil
Syncarpha Northampton Hybrid CSG	Syncarpha Northampton, LLC	Northampton, MA	5 GWh	Nov 2020	Dec 2023	Solar
CED Northampton Solar LLC Hybrid	Consolidated Edison Development Inc.	Northampton, MA	6 GWh	Nov 2019	Dec 2023	Solar
Syncarpha Northbridge I Hybrid(CSG)	Syncarpha Northbridge I, LLC	Whitinsville, MA	9 GWh	Nov 2021	Dec 2023	Solar
Syncarpha Northbridge II Hybrid CSG	Syncarpha Northbridge II, LLC	Whitinsville, MA	8 GWh	Mar 2021	Dec 2023	Solar
Goose Pond Solar	LSE Dorado, LLC	Southwick, MA	7 GWh	Dec 2019	Dec 2023	Solar
Cronin Road Solar 1, LLC CSG Hybrid	AES Distributed Energy	Warren, MA	3 GWh	May 2020	Dec 2023	Solar : 99.7%
Lane Ave Solar LLC	AES Distributed Energy	North Brookfield, MA	2 GWh	Aug 2021	Dec 2023	Solar
Ryan Road Solar LLC Hybrid(CSG)	AES Distributed Energy	North Brookfield, MA	8 GWh	Nov 2021	Dec 2023	Solar
W. Orange Rd Solar LLC	AES Distributed Energy	Orange, MA	7 GWh	Aug 2021	Dec 2023	Solar
Wilbur Woods Solar LLC	AES Distributed Energy	Orange, MA	8 GWh	Aug 2021	Dec 2023	Solar
West Street Solar 1 LLC	AES Distributed Energy	Gardner, MA	8 GWh	Nov 2019	Dec 2023	Solar
Hopkins Hill CSG	Nautilus Solar Solutions	West Greenwich, RI	11 GWh	Oct 2020	Dec 2023	Solar
Hopkinton Phase 2	Vista Solar, Inc.	Ashaway, RI	4 GWh	Aug 2020	Dec 2023	Solar
VPPSA Project 10	Vermont Public Power Supply Authority	Swanton, VT	908 MWh	Apr 2010	Dec 2023	Distillate Fuel Oil
Battle Creek Solar	Ecos Energy LLC	Bennington, VT	4 GWh	Sep 2018	Dec 2023	Solar
Middleton Solar Park	HG Solar Development, LLC	Middleton, MA	7 GWh	May 2018	Dec 2023	Solar
Brookfield Wire Company	Dynamic Energy Solutions, LLC	Brookfield, MA	2 GWh	May 2016	Dec 2023	Solar
Sherman Solar	Ecos Energy LLC	Griswold, CT	2 GWh	Nov 2019	Dec 2023	Solar
Jackson Solar (CT)	Ecos Energy LLC	Griswold, CT	2 GWh	Nov 2019	Dec 2023	Solar
Sydney Solar	Ecos Energy LLC	Hampton, CT	3 GWh	May 2020	Dec 2023	Solar
Dickinson Solar (CT)	Ecos Energy LLC	Hampton, CT	3 GWh	May 2020	Dec 2023	Solar
Becton Canaan	DG Northeast 1, LLC	North Canaan, CT	3 GWh	Feb 2018	Dec 2023	Solar
Plainfield Solar 2	Ecos Energy LLC	Plainfield, CT	1 GWh	Mar 2020	Dec 2023	Solar
Dudley River 2 Solar, LLC CSG	38 Degrees North, LLC	Southbridge, MA	2 GWh	Oct 2017	Dec 2023	Solar
Palmyra PV - BD Solar Palmyra LLC	BD Solar Palmyra LLC	Palmyra, ME	8 GWh	May 2022	Dec 2023	Solar
SELCO Community Solar	Massachusetts Mun Wholes Electric Co	Shrewsbury, MA	5 GWh	May 2018	Dec 2023	Solar
Fitchburg Renewables	Fitchburg Renewables, LLC	Fitchburg, MA	6 GWh	Feb 2020	Dec 2023	Solar
Montague Road Solar	Montague Road Solar, LLC	Amherst, MA	4 GWh	Nov 2019	Dec 2023	Solar
28 Livermore Hill Road Solar	28 Livermore Hill Road Solar, LLC	Westminster, MA	8 GWh	May 2020	Dec 2023	Solar
Amaterasu LLC	AES Distributed Energy	Lancaster, MA	7 GWh	May 2021	Dec 2023	Solar
Pine Hill	AEP Onsite Partners, LLC	Johnston, RI	8 GWh	Jul 2020	Dec 2023	Solar
Easthampton CSG	Easthampton Park Solar 1, LLC	Easthampton, MA	4 GWh	Aug 2020	Dec 2023	Solar
Erving CSG	Erving Poplar Mountain Solar 1, LLC	Erving, MA	1 GWh	Aug 2020	Dec 2023	Solar
Blackhorse Farm Solar, LLC CSG	AES Distributed Energy	Warren, RI	6 GWh	Nov 2020	Dec 2023	Solar
Oxford PV - BD Solar Oxford LLC	BD Solar Oxford LLC	Oxford, ME	11 GWh	May 2021	Dec 2023	Solar
Fairfield PV - BD Solar Fairfield LLC	BD Solar Fairfield LLC	Fairfield, ME	8 GWh	May 2021	Dec 2023	Solar
Augusta PV - BD Solar Augusta LLC	BD Solar Augusta LLC	Augusta, ME	7 GWh	May 2021	Dec 2023	Solar
Milo PV - BD Solar 1 LLC	BD Solar 1 LLC	Milo, ME	25 GWh	May 2021	Dec 2023	Solar
GD Hopkinton Main I, LLC	GD Hopkinton Main I, LLC	Hopkinton, RI	16 GWh	Oct 2020	Dec 2023	Solar
East Brookfield Main Street Solar LLC CSG	AES Distributed Energy	East Brookfield, MA	2 GWh	Nov 2020	Dec 2023	Solar
Williamsville Hybrid CSG	Williamsville Road LLC	Hubbardston, MA	7 GWh	Aug 2021	Dec 2023	Solar
Partridgeville Hybrid CSG	Partridgeville Road Solar 1, LLC	Athol, MA	6 GWh	Dec 2019	Dec 2023	Solar
CES Agawam Tuckahoe Solar Hybrid	CES Agawam Tuckahoe Solar LLC	Agawam, MA	7 GWh	Nov 2021	Dec 2023	Solar
ISM Solar Cranston CSG	Nautilus Solar Solutions	Cranston, RI	4 GWh	Nov 2020	Dec 2023	Solar
Cranberry Solar	GWE Cranberry Solar RT, LLC	Middleborough, MA	2 GWh	Nov 2016	Dec 2023	Solar
Oak Street Solar	Citizens Enterprises Corporation	Springfield, MA	5 GWh	Nov 2019	Dec 2023	Solar
Lakeville Solar	C2 MA Lakeville, LLC	Lakeville, MA	3 GWh	Nov 2018	Dec 2023	Solar
Bowden Solar LLC	38DN Power Fund 1 LLC	Monson, MA	3 GWh	Feb 2019	Dec 2023	Solar
One Patriot	Bloom Energy	Foxborough, MA	13 GWh	Nov 2019	Dec 2023	Natural Gas
Nutmeg Solar	Nutmeg Solar LLC	Enfield, CT	33 GWh	Nov 2020	Dec 2023	Solar
Palombo B Solar, LLC CSG	38 Degrees North, LLC	Uxbridge, MA	2 GWh	Nov 2017	Dec 2023	Solar
Palombo Solar, LLC CSG	38 Degrees North, LLC	Uxbridge, MA	3 GWh	Nov 2017	Dec 2023	Solar
Cohasse Solar, LLC CSG	38 Degrees North, LLC	Southbridge, MA	2 GWh	Sep 2017	Dec 2023	Solar
Ledeaux Solar, LLC CSG	38 Degrees North, LLC	North Brookfield, MA	1 GWh	Oct 2017	Dec 2023	Solar
Dudley River Solar, LLC CSG	38 Degrees North, LLC	Southbridge, MA	2 GWh	Oct 2017	Dec 2023	Solar
Hurteau Solar Project Hybrid	AES Distributed Energy	Uxbridge, MA	3 GWh	Feb 2020	Dec 2023	Solar : 98.8%
CP Middletown Solar II LLC	Green Street Power Partners	Middletown, CT	2 GWh	Nov 2019	Dec 2023	Solar
Kearsarge Amesbury Hybrid	Kearsarge Amesbury LLC	Amesbury, MA	5 GWh	Nov 2019	Dec 2023	Solar
UB Fuel Cell	UB Fuel Cell	Bridgeport, CT	10 GWh	Mar 2015	Dec 2023	Natural Gas
McDougle-Mitchell Solar Project Hybrid CSG	AES Distributed Energy	Charlton, MA	7 GWh	Jul 2020	Dec 2023	Solar
Cycz Solar Project CSG Hybrid	AES Distributed Energy	Spencer, MA	3 GWh	May 2020	Dec 2023	Solar

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