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 #12 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
VPPSA Project 10	Vermont Public Power Supply Authority	Swanton, VT	1 GWh	Apr 2010	Dec 2024	Distillate Fuel Oil
433 Purchase Solar NG, LLC	NuGen Capital Management	Swansea, MA	4 GWh	Mar 2012	Dec 2024	Solar
Sutton Solar CSG	Sutton Solar, LLC	Sutton, MA	3 GWh	Oct 2016	Dec 2024	Solar
Sutton Solar 2, LLC CSG	Sutton Solar 2, LLC	Sutton, MA	1 GWh	Nov 2020	Dec 2024	Solar
Sunderland Solar PV	NSTAR Electric Company	Sunderland, MA	2 GWh	Aug 2018	Dec 2024	Solar
Pembroke Hydro	Eagle Creek Renewable Energy, LLC	Suncook, NH	7 GWh	Nov 1985	Dec 2024	Water
Canis Major Solar Farm	LSE Canis Major LLC	Suffield, CT	4 GWh	Nov 2016	Dec 2024	Solar
Sudbury Solar	Ecos Energy LLC	Sudbury, VT	2 GWh	Apr 2016	Dec 2024	Solar
Sudbury Landfill	Heliovaas LLC	Sudbury, MA	2 GWh	Nov 2013	Dec 2024	Solar
ReEnergy Stratton LLC	ReEnergy Stratton LLC	Stratton, ME	203 GWh	Oct 1989	Dec 2024	Wood/Wood Waste Solids
Sikorsky Aircraft CHP	Sikorsky Aircraft Corporation	Stratford, CT	53 GWh	May 2010	Dec 2024	Natural Gas : 99.8%
Nebraska Valley Solar Farm	Town of Stowe- (VT)	Stowe, VT	1 GWh	Jul 2016	Dec 2024	Solar
Stow PV	AES Distributed Energy	Stow, MA	2 GWh	Nov 2013	Dec 2024	Solar
Shuman Solar	NuGen Capital Management	Stoughton, MA	2 GWh	Mar 2016	Dec 2024	Solar
UCONN Cogen Facility	University of Connecticut	Storrs, CT	124 GWh	Feb 2006	Sep 2025	Natural Gas : 98.9% Distillate Fuel Oil : 1.1%
Stillwater Hydro Station	Brookfield Black Bear Hydro, LLC	Stillwater, ME	7 GWh	Dec 1912	Dec 2024	Water
CES Sterling LLC	SunEdison LLC	Sterling, MA	3 GWh	Jan 2013	Dec 2024	Solar
MA Solar Storage 1 Hybrid	Origis Energy USA, Inc	Sterling, MA	1 GWh	Feb 2018	Dec 2024	Solar
Standish	Nautilus Solar Solutions	Standish, ME	7 GWh	Sep 2023	Dec 2024	Solar
Stamford Health Tully Health Center	Stamford Health Tully Health Center	Stamford, CT	5 GWh	Apr 2002	Dec 2024	Natural Gas
Waterside Power, LLC	Waterside Power, LLC	Stamford, CT	2 GWh	May 2003	Dec 2024	Distillate Fuel Oil
Stafford MS Ground Mount Community Solar	Town of Stafford - (CT)	Stafford, CT	3 GWh	Jun 2016	Dec 2024	Solar
Golden Solar	Cardinal Renewables	St. Johnsbury, VT	4 GWh	Oct 2021	Dec 2024	Solar
St. Albans SPEED Project	St. Albans Solar Partners, LLC	St. Albans, VT	2 GWh	Nov 2013	Dec 2024	Solar
NE Renewable Springfield, LLC	NE Renewable Springfield, LLC	Springfield, NH	33 GWh	Nov 1987	Dec 2024	Wood/Wood Waste Solids
Chicopee River Solar	Citizens Enterprises Corporation	Springfield, MA	3 GWh	Dec 2014	Dec 2024	Solar
Springfield Solar PV	NSTAR Electric Company	Springfield, MA	6 GWh	Dec 2018	Dec 2024	Solar
East Springfield Solar PV	NSTAR Electric Company	Springfield, MA	2 GWh	Sep 2018	Dec 2024	Solar
Cottage Street Solar Facility	Western Massachusetts Electric Company	Springfield, MA	4 GWh	Apr 2014	Sep 2025	Solar
Indian Orchard PV Facility	Western Massachusetts Electric Company	Springfield, MA	3 GWh	Nov 2011	Dec 2024	Solar
Indian Orchard Plant 1	Solutia Inc-Indian	Springfield, MA	137 MWh	Apr 1985	Aug 2025	Natural Gas
Smith & Wesson at Springfield MA PV	Luminace Solar Massachusetts, LLC	Springfield, MA	2 GWh	Jun 2017	Dec 2024	Solar
Oak Street Solar	Citizens Enterprises Corporation	Springfield, MA	6 GWh	Nov 2019	Dec 2024	Solar
ZPD-PT Solar Project 2017-044 LLC CSG	AES Distributed Energy	Spencer, MA	1 GWh	Sep 2021	Dec 2024	Solar
Woodchuck Solar, LLC CSG	38 Degrees North, LLC	Spencer, MA	2 GWh	Nov 2017	Dec 2024	Solar
Spencer Solar MA	Citizens Enterprises Corporation	Spencer, MA	4 GWh	Feb 2020	Dec 2024	Solar
Blair Wire Village Solar, LLC CSG	38 Degrees North, LLC	Spencer, MA	2 GWh	Nov 2017	Dec 2024	Solar
Cycz Solar Project CSG Hybrid	AES Distributed Energy	Spencer, MA	3 GWh	May 2020	Dec 2024	Solar
SJA Solar LLC-Solterra Monastery CSG	SJA Solar, LLC	Spencer, MA	27 GWh	Nov 2016	Dec 2024	Solar
Wilson Solar (MA)	Consolidated Edison Solutions Inc.	Spencer, MA	2 GWh	May 2013	Dec 2024	Solar
Kearsarge Southwick LLC	Kearsarge Solar LLC	Southwick, MA	4 GWh	Feb 2015	Dec 2024	Solar
Southwick Solar PV	NSTAR Electric Company	Southwick, MA	8 GWh	Dec 2018	Sep 2025	Solar
Sunpin Blandford	Blandford Sun, LLC	Southwick, MA	6 GWh	May 2020	Dec 2024	Solar
Goose Pond Solar	LSE Dorado, LLC	Southwick, MA	7 GWh	Dec 2019	Dec 2024	Solar
Southington Solar One	DG Connecticut III, LLC	Southington, CT	9 GWh	Jan 2022	Dec 2024	Solar
Shepaug	FirstLight Power Resources Services LLC	Southbury, CT	117 GWh	Dec 1954	Dec 2024	Water
Southbridge Solar	AES Distributed Energy	Southbridge, MA	2 GWh	Feb 2016	Sep 2025	Solar
Southbridge PV	Terraform Arcadia	Southbridge, MA	4 GWh	Dec 2013	Dec 2024	Solar
Southbridge Landfill Gas-to-Energy	Southbridge Recycling and Disposal Park	Southbridge, MA	12 GWh	Sep 2011	Dec 2024	Landfill Gas
ZPD-PT Solar Project 2017-023 LLC Hybrid	AES Distributed Energy	Southbridge, MA	4 GWh	Dec 2020	Dec 2024	Solar
Dresser Hill CSG	Dresser Hill Solar, LLC	Southbridge, MA	6 GWh	Dec 2020	Dec 2024	Solar
Dudley River 2 Solar, LLC CSG	38 Degrees North, LLC	Southbridge, MA	2 GWh	Oct 2017	Dec 2024	Solar
Annese Solar Project Hybrid CSG	AES Distributed Energy	Southbridge, MA	8 GWh	Nov 2020	Dec 2024	Solar
West A&B Solar Project Hybrid CSG	AES Distributed Energy	Southbridge, MA	5 GWh	Nov 2020	Dec 2024	Solar
Alicea Solar Project Hybrid CSG	AES Distributed Energy	Southbridge, MA	4 GWh	Nov 2020	Dec 2024	Solar
Cohasse Solar, LLC CSG	38 Degrees North, LLC	Southbridge, MA	2 GWh	Sep 2017	Dec 2024	Solar
Dudley River Solar, LLC CSG	38 Degrees North, LLC	Southbridge, MA	2 GWh	Oct 2017	Dec 2024	Solar
Dudley River 3 Solar, LLC CSG	38 Degrees North, LLC	Southbridge, MA	2 GWh	Oct 2017	Dec 2024	Solar
Southampton Solar PV	NSTAR Electric Company	Southampton, MA	3 GWh	Jan 2019	Dec 2024	Solar
ALDI DC 2	Powerflex	South Windsor, CT	1 GWh	Jan 2018	Dec 2024	Solar
Ticket Network South Windsor	Powerflex	South Windsor, CT	2 GWh	Apr 2018	Dec 2024	Solar
South Windsor Fuel Cell	South Energy Investments LLC	South Windsor, CT	39 GWh	Feb 2020	Dec 2024	Natural Gas
Bird Machine Solar Farm	Bird Machine Solar Farm, LLC	South Walpole, MA	6 GWh	Jul 2017	Dec 2024	Solar
ISM Solar Shepherd Acres	Navisun LLC	South Paris, ME	65 MWh	Nov 2024	Dec 2024	Solar
Kearsarge SKSC2 LLC	Kearsarge SKSC2 LLC	South Kingstown, RI	6 GWh	Sep 2018	Dec 2024	Solar
Kearsarge SKSC1 LLC	Kearsarge SKSC1 LLC	South Kingstown, RI	6 GWh	Sep 2018	Dec 2024	Solar
Northbridge Solar	Consolidated Edison Development Inc.	South Grafton, MA	3 GWh	Jul 2013	Dec 2024	Solar
Old Frontier Solar III	Old Frontier Solar III PV, LLC	South Deerfield, MA	4 GWh	Aug 2022	Dec 2024	Solar
Federal Road Solar 1, LLC CSG	Federal Road Solar 1, LLC	South Carver, MA	8 GWh	Nov 2015	Dec 2024	Solar
Chittenden County Solar Partners	Chittenden County Solar Partners LLC	South Burlington, VT	3 GWh	Apr 2011	Dec 2024	Solar
Claire Solar Farm	Claire Solar Partners LLC	South Burlington, VT	4 GWh	Jun 2014	Dec 2024	Solar
158th Fighter Wing Solar Farm	158th Fighter Wing	South Burlington, VT	1 GWh	Aug 2011	Dec 2023	Solar
Gorge 18	Green Mountain Power Corp	South Burlington, VT	17 GWh	Dec 1927	Dec 2024	Water
Salmon Falls	Green Mountain Power Corp	South Berwick, ME	3 GWh	Jun 1986	Dec 2024	Water
CoreSite - Somerville	Bloom Energy	Somerville, MA	5 GWh	Aug 2020	Dec 2024	Natural Gas
Somersworth Lower Great Dam	Green Mountain Power Corp	Somersworth, NH	3 GWh	Jun 1985	Jun 2024	Water
Somers Solar Center, LLC	Onward Energy	Somers, CT	9 GWh	Nov 2013	Dec 2024	Solar
Blair Solar	Ecos Energy LLC	Somers, CT	2 GWh	Dec 2020	Dec 2024	Solar
Madison Solar (CT)	Ecos Energy LLC	Somers, CT	2 GWh	Dec 2020	Dec 2024	Solar
Few Solar	Ecos Energy LLC	Somers, CT	2 GWh	Dec 2020	Dec 2024	Solar
Barrow Solar	Ecos Energy LLC	Somers, CT	3 GWh	May 2021	Dec 2024	Solar
Williams Hydro	Brookfield White Pine Hydro LLC	Solon, ME	80 GWh	Dec 1938	Dec 2024	Water
Elizabeth Mines Solar 1	Elizabeth Mines Solar 1, LLC	So. Strafford, VT	7 GWh	Oct 2017	Dec 2024	Solar
Smithfield Solar Farm, LLC	Smithfield Solar Farm	Smithfield, RI	4 GWh	Jun 2020	Dec 2024	Solar
ME Novel Lighthouse - Front St. Solar CS	Luminace Sunbeam Development Holdings, LLC	Skowhegan, ME	4 GWh	Apr 2023	Dec 2024	Solar
Bates College Skowhegan	Westbound Solar 3, LLC	Skowhegan, ME	8 GWh	Aug 2023	Dec 2024	Solar
Weston Hydro	Brookfield White Pine Hydro LLC	Skowhegan, ME	57 GWh	Dec 1919	Dec 2024	Water
Somerset Plant	Sappi Fine Paper North America-Somerset	Skowhegan, ME	573 GWh	Dec 1975	Sep 2025	Black Liquor : 46.2% Wood/Wood Waste Solids : 38.4% Natural Gas : 6.9% Tire-derived Fuels : 5.1% Residual Fuel Oil : 2.5% Sludge Waste : 0.8%
DWW Solar ll	DWW Solar ll LLC	Simsbury, CT	52 GWh	Nov 2019	Sep 2025	Solar
Sidney	Nautilus Solar Solutions	Sidney, ME	2 GWh	Apr 2023	Dec 2024	Solar
Centech Gas Generator	Town of Shrewsbury - (MA)	Shrewsbury, MA	537 MWh	Mar 2019	Dec 2024	Natural Gas
SELCO Community Solar	Massachusetts Mun Wholes Electric Co	Shrewsbury, MA	5 GWh	May 2018	Dec 2024	Solar
Shrewsbury	Town of Shrewsbury - (MA)	Shrewsbury, MA	34 MWh	Oct 1969	Dec 2024	Distillate Fuel Oil
Shrewsbury Solar	Consolidated Edison Development Inc.	Shrewsbury, MA	4 GWh	Sep 2012	Dec 2024	Solar
Shirley Water	Altus Power America Management, LLC	Shirley, MA	3 GWh	Jul 2016	Dec 2024	Solar
Shirley Landfill	Altus Power America Management, LLC	Shirley, MA	1 GWh	Apr 2017	Dec 2024	Solar
Devens	Altus Power America Management, LLC	Shirley, MA	5 GWh	May 2014	Dec 2024	Solar
EBZ Solar	Citizens Enterprises Corporation	Shirley, MA	4 GWh	Dec 2012	Dec 2024	Solar
Derby Hydro	McCallum Enterprises I LP	Shelton, CT	24 GWh	Dec 1988	Dec 2024	Water
Emerald Gardens PKI, LLC	Emerald Gardens PKI, LLC	Shelton, CT	2 GWh	Sep 2021	Dec 2024	Solar

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	696.7 GWh	4
#25	Dominion Energy South Carolina, Inc.	25.7 TWh	87
#13	Duke Energy Carolinas	112.5 TWh	565
#17	Duke Energy Progress East	64.3 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	870.7 TWh	2,465
#30	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	188.0 TWh	2,075
#9	Tennessee Valley Authority	161.6 TWh	204
#10	Florida Power & Light Co.	148.9 TWh	187
#12	New York Independent System Operator	131.6 TWh	1,211
#13	Duke Energy Carolinas	112.5 TWh	565
#15	ISO New England	105.5 TWh	1,577
#16	Bonneville Power Administration	80.5 TWh	163
#17	Duke Energy Progress East	64.3 TWh	559
#18	PacifiCorp East	61.1 TWh	216
#19	Salt River Project Agricultural Improvement and Power District	60.0 TWh	48