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
Hydro Kennebec Project	Hydro Kennebec LLC	Winslow, ME	27 GWh	Dec 1988	Dec 2024	Water
University Solar, LLC	AES Distributed Energy	West Greenwich, RI	27 GWh	Nov 2019	Sep 2025	Solar
Sherman	Great River Hydro, LLC	Rowe, MA	27 GWh	Nov 1926	Dec 2024	Water
Fairfield University CHP Plant	Fairfield University	Fairfield, CT	26 GWh	Sep 2007	Dec 2024	Natural Gas
Pisgah Mountain Wind	Pisgah Mountain, LLC	Clifton, ME	25 GWh	Nov 2016	Dec 2024	Wind
Woods Hill Solar	Woods Hill Solar, LLC	Pomfret, CT	25 GWh	Nov 2018	Sep 2025	Solar
Deerfield 3	Great River Hydro, LLC	Buckland, MA	25 GWh	Jul 1912	Dec 2024	Water
Eastman Falls	Central Rivers Power NH, LLC	Franklin, NH	24 GWh	Jul 1937	Dec 2024	Water
Frito Lay Incorporated	Frito Lay Incorporated Dayville	Dayville, CT	24 GWh	Feb 2009	Sep 2025	Natural Gas
Derby Hydro	McCallum Enterprises I LP	Shelton, CT	24 GWh	Dec 1988	Dec 2024	Water
Hampton Facility	Foss Manufacturing Company LLC	Hampton, NH	24 GWh	Sep 1978	Sep 2025	Natural Gas
Alton Road Solar	Revity Energy LLC	Bradford, RI	24 GWh	Nov 2019	Dec 2024	Solar
Coolidge Solar 1, LLC	Coolidge Solar I, LLC	Ludlow, VT	24 GWh	Nov 2018	Sep 2025	Solar
Medway Hydro	Brookfield Black Bear Hydro, LLC	Medway, ME	23 GWh	Dec 1922	Dec 2024	Water
Potter Station 2	Town of Braintree - (MA)	Braintree, MA	23 GWh	Jun 1963	Dec 2024	Natural Gas : 93.9% Distillate Fuel Oil : 6.1%
Huntington Falls	Green Mountain Power Corp	Weybridge, VT	23 GWh	Sep 1988	Dec 2024	Water
West Groton CHP	Hollingsworth & Vose Co West Groton	Groton, MA	22 GWh	Nov 2015	Dec 2024	Natural Gas
Ellsworth Hydro Station	Brookfield Black Bear Hydro, LLC	Ellsworth, ME	22 GWh	Jun 1924	Dec 2024	Water
Jericho Power	Jericho Power LLC	Berlin, NH	22 GWh	Dec 2015	Sep 2025	Wind
Rhode Island Solar Renewable Energy IV,	Rhode Island Solar Renewable Energy IV, LLC	Tiverton, RI	21 GWh	Nov 2023	Dec 2024	Solar
Orono B	Brookfield Black Bear Hydro, LLC	Orono, ME	21 GWh	Oct 2013	Dec 2024	Water
Wallingford Solar	Wallingford Renewable Energy, LLC	Wallingford, CT	21 GWh	Aug 2021	Dec 2024	Solar
Newport	Great Bay Hydro Corp	Newport, VT	21 GWh	Dec 1935	Dec 2024	Water
UI RCP Bridgeport Seaside	United Illuminating Co	Bridgeport, CT	21 GWh	Oct 2015	Sep 2025	Natural Gas : 84.6% Solar : 15.4%
Fairfax Falls	Green Mountain Power Corp	Fairfax, VT	20 GWh	Jan 1919	Dec 2024	Water
West Buxton	Brookfield White Pine Hydro LLC	Buxton, ME	20 GWh	Dec 1903	Dec 2024	Water
Deerfield 4	Great River Hydro, LLC	Buckland, MA	20 GWh	Jul 1912	Dec 2024	Water
Rainbow (CT)	Farmington River Power Company	Windsor, CT	20 GWh	Nov 1925	Sep 2025	Water
Barrett PV	MN8 Energy LLC	Oxford, MA	20 GWh	Oct 2016	Dec 2024	Solar
Boatlock	City of Holyoke Gas and Electric Dept.	Holyoke, MA	19 GWh	Dec 1920	Dec 2024	Water
Central Power Plant	State of Rhode Island	Cranston, RI	19 GWh	Jul 1958	Sep 2025	Natural Gas : 98.5% Distillate Fuel Oil : 1.5%
Waste Management Crossroads LFGTE	WM Renewable Energy LLC	Norridgewock, ME	18 GWh	Feb 2009	Dec 2024	Landfill Gas
TPE King Solar Holdings1, LLC (CSG)	Nautilus Solar Solutions	North Smithfield, RI	18 GWh	Mar 2022	Dec 2024	Solar
International Paper Riley Hydro	Eagle Creek Renewable Energy, LLC	Jay, ME	18 GWh	Nov 1981	Dec 2024	Water
UI RCP Woodbridge FC	United Illuminating Co	Woodbridge, CT	18 GWh	Nov 2016	Dec 2024	Natural Gas
UDR Glastonbury Fuel Cell	UIL Distributed Resources, LLC	Glastonbury, CT	18 GWh	Jan 2016	Dec 2024	Natural Gas
International Paper Livermore Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	17 GWh	Dec 1909	Dec 2024	Water
Rolfe Canal Hydro	Briar-Hydro Associates	Penacook, NH	17 GWh	Nov 1987	Dec 2024	Water
Clark Falls	Green Mountain Power Corp	Milton, VT	17 GWh	Jan 1937	Dec 2024	Water
Shawmut	Brookfield White Pine Hydro LLC	Shawmut, ME	17 GWh	Dec 1912	Dec 2024	Water
Greater New Bedford LFG Utiliz. Facility	CommonWealth New Bedford Energy LLC	New Bedford, MA	17 GWh	Sep 2005	Dec 2024	Landfill Gas
Gorge 18	Green Mountain Power Corp	South Burlington, VT	17 GWh	Dec 1927	Dec 2024	Water
Penacook Lower Falls	Briar-Hydro Associates	Boscawen, NH	17 GWh	Jul 1983	Dec 2024	Water
Pittsfield Solar LLC	Pittsfiled Solar LLC	Pittsfield, ME	17 GWh	Nov 2017	Dec 2024	Solar
One Patriot	Bloom Energy	Foxborough, MA	16 GWh	Nov 2019	Dec 2024	Natural Gas
Hope Farm Solar, LLC	Adapture Renewables, Inc.	Cranston, RI	16 GWh	Aug 2019	Dec 2024	Solar
Putts Bridge	Central Rivers Power MA, LLC	Ludlow, MA	16 GWh	Dec 1917	Dec 2024	Water
GD Hopkinton Main I, LLC	GD Hopkinton Main I, LLC	Hopkinton, RI	16 GWh	Oct 2020	Dec 2024	Solar
Medtronic - New Haven 2	Bloom Energy	North Haven, CT	16 GWh	Sep 2020	Dec 2024	Natural Gas
Pepperidge Farm Bloomfield	Pepperidge Farm, Inc.- Bloomfield	Bloomfield, CT	15 GWh	Jul 2008	Dec 2024	Natural Gas
Searsburg	Great River Hydro, LLC	Searsburg, VT	15 GWh	Feb 1922	Dec 2024	Water
Errol Hydroelectric Project	Errol Hydroelectric Co LLC	Errol, NH	15 GWh	Oct 1986	Dec 2024	Water
Waterbury 22	Green Mountain Power Corp	Waterbury, VT	15 GWh	May 1953	Dec 2024	Water
Equinix - Billerica	Bloom Energy	Billerica, MA	15 GWh	Aug 2021	Dec 2024	Natural Gas
GDIM 3, LLC	GDIM 3, LLC	North Smithfield, RI	15 GWh	Nov 2021	Dec 2024	Solar
Oxford PV - BD Solar Oxford LLC	BD Solar Oxford LLC	Oxford, ME	15 GWh	May 2021	Dec 2024	Solar
Yale New Haven - New London	Bloom Energy	New London, CT	15 GWh	Aug 2022	Dec 2024	Natural Gas
Moscow	Greenbacker Renewable Energy Corporation	Moscow, ME	14 GWh	-	Sep 2025	Wind
0 Hammond St CSG	0HAM WHAM8 Solar, LLC	Carver, MA	14 GWh	Sep 2021	Dec 2024	Solar
GDIM 4, LLC	GDIM 4, LLC	North Smithfield, RI	14 GWh	Nov 2021	Dec 2024	Solar
Boston Medical Center CHP Plant	Boston Medical Center	Boston, MA	14 GWh	Mar 2017	Dec 2024	Natural Gas
GDIM 1, LLC	GDIM 1, LLC	North Smithfield, RI	14 GWh	Nov 2021	Dec 2024	Solar
Smith College Central Heating Plant	The Trustees of Smith College	Northampton, MA	14 GWh	Sep 2008	Dec 2024	Natural Gas
Future Generation Wind	Consolidated Edison Solutions Inc.	Plymouth, MA	14 GWh	Jul 2016	Dec 2024	Wind
Weybridge	Green Mountain Power Corp	Weybridge, VT	14 GWh	Jan 1951	Dec 2024	Water
Oakdale Power Station	Massachusetts Water Res Auth	West Boylston, MA	14 GWh	Apr 1951	Dec 2024	Water
Kearsarge Smithfield LLC	Kearsarge Smithfield LLC	Burrillville, RI	14 GWh	Mar 2023	Dec 2024	Solar
Lockwood Hydroelectric Facility	Merimil Ltd Partnership	Waterville, ME	14 GWh	Sep 1985	Dec 2024	Water
Beldens	Green Mountain Power Corp	New Haven, VT	14 GWh	Jul 1913	Dec 2024	Water
Nashua Plant	NextEra Renewable Fuels, LLC	Nashua, NH	13 GWh	Mar 1996	Dec 2024	Landfill Gas
SR North Stonington	SR North Stonington, LLC	North Stonington, CT	13 GWh	Feb 2024	Dec 2024	Solar
UI RCP New Haven Fuel Cell	United Illuminating Co	New Haven, CT	13 GWh	Jul 2015	Sep 2025	Natural Gas
Mine Falls Generating Station	City of Nashua, NH	Nashua, NH	13 GWh	Nov 1985	Dec 2024	Water
GDIM 2, LLC	GDIM 2, LLC	North Smithfield, RI	13 GWh	Nov 2021	Dec 2024	Solar
Winslow PV - BD Solar 2 LLC	BD Solar 2 LLC	Winslow, ME	13 GWh	Jun 2022	Dec 2024	Solar
Turners Falls	FirstLight Power Resources, Inc. - MA	Montague, MA	12 GWh	Dec 1904	Dec 2024	Water
Southbridge Landfill Gas-to-Energy	Southbridge Recycling and Disposal Park	Southbridge, MA	12 GWh	Sep 2011	Dec 2024	Landfill Gas
Bradley Energy Center	Ameresco Select Inc	Windsor Locks, CT	12 GWh	Oct 2002	Dec 2024	Natural Gas
Penacook Upper Falls Hydro	Briar-Hydro Associates	Penacook, NH	12 GWh	Nov 1986	Dec 2024	Water
Trinity College Fuel Cell	AEP Onsite Partners, LLC	Hartford, CT	12 GWh	Jul 2018	Dec 2024	Natural Gas
Searsburg Wind Turbine	Green Mountain Power Corp	Searsburg, VT	12 GWh	May 1997	Sep 2025	Wind
59 Federal Rd(CSG)	59FED WHAM8 Solar, LLC	Carver, MA	11 GWh	Oct 2021	Dec 2024	Solar
Cellu Tissue	Dunn Paper East Hartford, LLC	East Hartford, CT	11 GWh	Apr 2009	Sep 2025	Natural Gas
Gorham	Central Rivers Power NH, LLC	Gorham, NH	11 GWh	Jul 1917	Dec 2024	Water
CCSU Fuel Cell Project	New Britain Renewable Energy, LLC	New Britain, CT	11 GWh	Mar 2012	Dec 2024	Natural Gas
Gardners Falls	Central Rivers Power MA, LLC	Buckland, MA	11 GWh	Dec 1913	Dec 2024	Water
Wind Colebrook South	Wind Colebrook South	Colebrook, CT	11 GWh	Oct 2015	Sep 2025	Wind
Old Middleboro Road Solar	Agilitas Energy, Inc.	Rochester, MA	11 GWh	Dec 2022	Dec 2024	Solar
Dunstable Solar 1, LLC	AES Distributed Energy	Dunstable, MA	11 GWh	Mar 2021	Dec 2024	Solar
Messalonskee 2 (Oakland)	Messalonskee Stream Hydro LLC	Oakland, ME	11 GWh	Dec 1923	Dec 2024	Water
Foxwoods CoGen	Foxwoods Resort Casino	Mashantucket, CT	11 GWh	May 2010	Dec 2024	Natural Gas
Stillwater B	Brookfield Black Bear Hydro, LLC	Old Town, ME	11 GWh	Aug 2013	Dec 2024	Water
UB Fuel Cell	UB Fuel Cell	Bridgeport, CT	10 GWh	Mar 2015	Dec 2023	Natural Gas
Brassua Hydroelectric Project	Brassua Hydroelectric LP	Rockwood, ME	10 GWh	Aug 1989	Dec 2024	Water
Beaver Ridge Wind	CPV Beaver Ridge Wind LLC	Freedom, ME	10 GWh	Oct 2008	Dec 2024	Wind
Quarry	Nautilus Solar Solutions	North Berwick, ME	10 GWh	Nov 2022	Dec 2024	Solar
Bucksport Generation LLC	Bucksport Generation LLC	Bucksport, ME	10 GWh	Jun 1965	Aug 2025	Natural Gas : 97.3% Distillate Fuel Oil : 2.7%
Huxley Solar	Huxley Solar, LLC	Ludlow, MA	10 GWh	Nov 2022	Dec 2024	Solar
Tank Farm 4	Solar Breakers LLC	Portsmouth, RI	10 GWh	Sep 2022	Dec 2024	Solar
Digital Fairfield	Bloom Energy	Trumbull, CT	10 GWh	May 2018	Jun 2024	Natural Gas

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