ISO New England

Balancing Authority Summary Information

ISO New England is ranked #15 out of 64 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	Jul 2026
Annual Generation	111.1 TWh
Power Plants	1,629
Utilities	833
Ranked #15 out of 64 in terms of net annual generation
Ranked #10 out of 53 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 54.9% Nuclear \| 25% Wind \| 5.1% Water \| 4.5% Other Fuel \| 4.4% Solar \| 1.6% 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
Hamilton Solar	Ecos Energy LLC	Lebanon, CT	2 GWh	Feb 2018	Dec 2025	Solar
Adams Solar	Ecos Energy LLC	Lebanon, CT	2 GWh	Feb 2018	Dec 2025	Solar
Franklin Solar (CT)	Ecos Energy LLC	Lebanon, CT	2 GWh	Feb 2018	Dec 2025	Solar
Lebanon Pines 1 & 2	Connecticut Mun Elec Engy Coop	Lebanon, CT	374 MWh	Mar 2010	Dec 2025	Distillate Fuel Oil
Lebanon West Lebanon Solar 1	Lebanon West Lebanon Solar 1, LLC	Lebanon, ME	3 GWh	Nov 2024	Dec 2025	Solar
Lebanon CSG LLC	Dimension Energy LLC	Lebanon, ME	6 GWh	Nov 2024	Dec 2025	Solar
Stafford St 2 Community Solar	Stafford St Solar 2, LLC	Lecister, MA	4 GWh	Apr 2018	Dec 2024	Solar
Lee Site 31 Solar	NSTAR Electric Company	Lee, MA	149 MWh	Jul 2018	Dec 2025	Solar
Walden Solar Maine V	Walden Solar Maine V LLC	Leeds, ME	36 GWh	Nov 2024	Dec 2025	Solar
Dynamic - Leeds Solar (CSG)	Nautilus Solar Solutions	Leeds, ME	9 GWh	Oct 2024	Dec 2025	Solar
Cherry Valley Solar, LLC CSG	38 Degrees North, LLC	Leicester, MA	2 GWh	Oct 2017	Dec 2025	Solar
Boutillier Solar, LLC CSG	38 Degrees North, LLC	Leicester, MA	5 GWh	Mar 2018	Dec 2025	Solar
Syncarpha Leicester Hybrid CSG	Syncarpha Leicester, LLC	Leicester, MA	4 GWh	May 2021	Dec 2025	Solar
Stafford St Solar 3 CSG	Stafford St Solar 3, LLC	Leicester, MA	2 GWh	Nov 2017	Dec 2024	Solar
Stafford St Solar 1 CSG	Stafford St Solar 1, LLC	Leicester, MA	4 GWh	Nov 2017	Dec 2024	Solar
Leicester One MA Solar LLC	CVI CleanCapital Solar 1 LLC	Leicester, MA	5 GWh	Dec 2014	Dec 2025	Solar
Antanavica Solar	SunStrong Management, LLC	Leicester, MA	1 GWh	Jul 2018	Dec 2024	Solar
Lempster Wind LLC	Avangrid Power LLC	Lempster, NH	62 GWh	Nov 2008	May 2026	Wind
AIS Solar Project	Terraform Arcadia	Leominster, MA	3 GWh	Nov 2016	Dec 2025	Solar
Leominster	Syncarpha Massachusetts, LLC	Leominster, MA	3 GWh	Apr 2015	Dec 2025	Solar
Gulf Island	Brookfield White Pine Hydro LLC	Lewiston, ME	115 GWh	Dec 1925	Dec 2025	Water
Charles E Monty	Brookfield White Pine Hydro LLC	Lewiston, ME	114 GWh	Dec 1989	Dec 2025	Water
Merrill Road Solar	NextGrid Mangrove, LLC	Lewiston, ME	6 GWh	Feb 2022	Dec 2025	Solar
Lisbon Street Solar	NextGrid Cliffrose, LLC	Lewiston, ME	3 GWh	Mar 2022	Dec 2025	Solar
MD - EDFR - Phase II - Lewiston	Hayworth Solar Partners, LLC	Lewiston, ME	8 GWh	Oct 2024	Dec 2025	Solar
Town of Lexington Solar	Syncarpha Lexington, LLC	Lexington, MA	3 GWh	Apr 2017	Dec 2025	Solar
Limestone CSG 1 LLC	Limestone CSG 1 LLC	Limestone, ME	6 GWh	Nov 2024	Dec 2025	Solar
Limestone CSG 2 LLC	Limestone CSG 2 LLC	Limestone, ME	5 GWh	Oct 2024	Dec 2025	Solar
Loring	Altus Power America Management, LLC	Limestone, ME	8 GWh	Apr 2023	Dec 2025	Solar
WED GW Solar, LLC	CleanCapital Holdings	Lincoln, RI	4 GWh	Dec 2018	Dec 2025	Solar
Worumbo Hydro Station	Eagle Creek Renewable Energy, LLC	Lisbon Falls, ME	74 GWh	Jan 1989	Dec 2025	Water
Wheelabrator Lisbon	Wheelabrator Environmental Systems	Lisbon, CT	101 GWh	Sep 1995	May 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
SR Litchfield	SR Litchfield, LLC	Litchfield, CT	26 GWh	Jan 2025	Dec 2025	Solar
Little Falls Solar 1	Little Falls Solar 1, LLC	Little Falls, NY	3 GWh	Aug 2020	Dec 2025	Solar
Little Falls Solar	Little Falls Solar	Little Falls, NY	3 GWh	Sep 2020	Dec 2025	Solar
Nextsun Energy Littleton	Greenbacker Renewable Energy Corporation	Littleton, MA	5 GWh	Sep 2013	Dec 2025	Solar
S C Moore	Great River Hydro, LLC	Littleton, NH	255 GWh	Dec 1956	Dec 2025	Water
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	38 GWh	Dec 1984	May 2026	Water
ReEnergy Livermore Falls	ReEnergy Livermore Falls	Livermore Falls, ME	274 GWh	Jul 1992	Dec 2025	Wood/Wood Waste Solids
International Paper Livermore Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	24 GWh	Dec 1909	Dec 2025	Water
Livermore Falls CSG	Livermore Falls CSG, LLC	Livermore Falls, ME	4 GWh	Apr 2022	Dec 2025	Solar
Pendleton Solar 1	Pendleton Solar 1, LLC	Lockport, NY	7 GWh	Sep 2020	Dec 2025	Solar
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	4 TWh	Feb 2003	May 2026	Natural Gas
Pumpkin Hill	KEI (Maine) Power Management (II) LLC	Lowell, ME	3 GWh	Feb 1987	Dec 2025	Water
Boott Hydropower	Boott Hydro, LLC - Hybrid	Lowell, MA	61 GWh	Sep 1985	Dec 2025	Water
Lowell Solar Landfill	Heliovaas LLC	Lowell, MA	1 GWh	Nov 2013	Dec 2025	Solar
Kingdom Community Wind	Green Mountain Power Corp	Lowell, VT	164 GWh	Oct 2012	May 2026	Wind
Putts Bridge	Central Rivers Power MA, LLC	Ludlow, MA	11 GWh	Dec 1917	Dec 2025	Water
Ludlow Landfill	CleanCapital Holdings	Ludlow, MA	3 GWh	Jul 2013	Dec 2025	Solar
Stony Brook	Massachusetts Mun Wholes Electric Co	Ludlow, MA	164 GWh	Oct 1981	May 2026	Distillate Fuel Oil : 61.3% Natural Gas : 38.7%
Ludlow Site 72 - Conti	NSTAR Electric Company	Ludlow, MA	3 GWh	Jul 2018	Dec 2025	Solar
Kearsarge Ludlow LLC	Kearsarge Ludlow LLC	Ludlow, MA	6 GWh	Nov 2020	Dec 2025	Solar
Huxley Solar	Agilitas Energy, Inc.	Ludlow, MA	10 GWh	Nov 2022	Dec 2025	Solar
Coolidge Solar 1, LLC	Coolidge Solar I, LLC	Ludlow, VT	25 GWh	Nov 2018	May 2026	Solar
Settlers Solar	Settlers Solar, LLC	Lunenberg, MA	7 GWh	Nov 2020	Dec 2025	Solar
Electric Avenue Lunenburg Solar 1	Electric Avenue Lunenburg Solar 1, LLC	Lunenburg, MA	2 GWh	Nov 2021	Dec 2025	Solar
651 Chase Solar NG	NuGen Capital Management	Lunenburg, MA	4 GWh	May 2014	Dec 2025	Solar
265 Pleasant Solar NG, LLC	NuGen Capital Management	Lunenburg, MA	1 GWh	Jun 2014	Dec 2025	Solar
GSPP Gilman, LLC	Green Street Power Partners	Lunenburg, VT	3 GWh	Aug 2018	Dec 2025	Solar
Great Falls (VT)	The Town of Lyndon Elec Dept - (VT)	Lyndon, VT	2 GWh	Jul 1915	Dec 2025	Water
General Electric Aircraft Engines	General Electric Aircraft Engines	Lynn, MA	2 GWh	Dec 1947	May 2026	Solar
Anson Abenaki Hydros	Eagle Creek Renewable Energy, LLC	Madison, ME	101 GWh	Dec 1949	Dec 2025	Water
IOS - MEW Phase 1	Madison Energy Holdings LLC	Madison, ME	1 GWh	Dec 2016	Dec 2024	Solar
Dynamic Madison (CSG)	MN8 Energy LLC	Madison, ME	10 GWh	Jul 2022	Dec 2025	Solar
Manchester Community College East	Onyx Asset Services Group	Manchester, CT	2 GWh	Sep 2018	Dec 2024	Solar
Treasure Lane Solar 1	AES Clean Energy	Manchester, ME	8 GWh	Apr 2023	Dec 2025	Solar
Amoskeag	Central Rivers Power NH, LLC	Manchester, NH	65 GWh	Jul 1922	Dec 2025	Water
Kenmare - Mansfield Branch Street	MN8 Energy LLC	Mansfield, MA	2 GWh	May 2017	Dec 2025	Solar
Wilkins Station	Town of Marblehead - (MA)	Marblehead, MA	32 MWh	Oct 1975	Dec 2025	Distillate Fuel Oil
GSPP 7024 Fox Rd, LLC	Green Street Power Partners	Marcy, NY	6 GWh	Apr 2023	Dec 2025	Solar
Mars Hill	Greenbacker Renewable Energy Corporation	Mars Hill, ME	4 GWh	Oct 2024	Dec 2025	Solar
Emerald Marshfields, LLC	Emerald Marshfield, LLC	Marshfield, MA	2 GWh	Nov 2022	Dec 2025	Solar
Marshfield PV	Terraform Arcadia	Marshfield, MA	5 GWh	Nov 2013	Dec 2025	Solar
Marshfield 6	Green Mountain Power Corp	Marshfield, VT	4 GWh	Dec 1926	Dec 2025	Water
Barnstable Landfill	Clean Focus Yield, LLC	Marstons Mills, MA	5 GWh	Aug 2014	Dec 2025	Solar
Marston Mills Solar	SoCore Energy LLC	Marstons Mills, MA	6 GWh	Nov 2021	Dec 2025	Solar
BNRG Masardis (CSG)	Nautilus Solar Solutions	Masardis, ME	4 GWh	Nov 2024	Dec 2025	Solar
Foxwoods CoGen	Foxwoods Resort Casino	Mashantucket, CT	11 GWh	May 2010	Dec 2025	Natural Gas
Mashpee Landfill Solar	Nautilus Solar Solutions	Mashpee, MA	2 GWh	Aug 2014	Dec 2025	Solar
118 Echo	Madison Energy Investments LLC	Mashpee, MA	814 MWh	Jun 2023	Dec 2025	Solar
DG Crystal Spring CSG	DG Crystal Spring LLC	Mattapoisett, MA	7 GWh	Jun 2017	Dec 2025	Solar
BWC Origination 18	BWC Origination 18, LLC	Mattapoisett, MA	7 GWh	Nov 2018	Dec 2025	Solar
Maynard PV	Terraform Arcadia	Maynard, MA	1 GWh	Dec 2013	Dec 2025	Solar
Mechanic Falls	KEI (Maine) Power Management (IV) LLC	Mechanic Falls, ME	2 GWh	Mar 1986	Dec 2025	Water
SP-339 Mechanic Falls	Madison Energy Investments LLC	Mechanic Falls, ME	1 GWh	Nov 2024	Dec 2025	Solar
Medway Hydro	Brookfield Black Bear Hydro, LLC	Medway, ME	23 GWh	Dec 1922	Dec 2025	Water
Exelon West Medway II LLC	Constellation Power, Inc	Medway, MA	259 GWh	Feb 2019	May 2026	Natural Gas : 95.3% Kerosene : 4.7%
Exelon Medway LLC	Constellation Power, Inc	Medway, MA	4 GWh	Jun 1970	Dec 2025	Distillate Fuel Oil
Medway Grid	Medway Grid LLC	Medway, MA	20 GWh	-	May 2026	Electricity used for energy storage
BWC Muddy Brook, LLC Hybrid	AES Distributed Energy	Mendon, MA	2 GWh	Aug 2021	Dec 2025	Solar : 99.8%
Mendon	BWC Box Pond LLC	Mendon, MA	4 GWh	Nov 2017	Dec 2024	Solar
BWC Mystic River	BWC Mystic River LLC	Mendon, MA	2 GWh	Jun 2017	Dec 2025	Solar
BWC Wading River One, Two, Three CSG	Ameresco BWC Wading River LLC	Mendon, MA	2 GWh	Oct 2017	Dec 2025	Solar
Merrimac Solar	RWE Clean Energy	Merrimac, MA	2 GWh	Nov 2013	Dec 2025	Solar
Merrimack Solar Farm, LLC	Merrimack Solar Farm	Merrimack, NH	3 GWh	Dec 2018	Dec 2025	Solar
Aegean Drive Solar	Aegean Drive Solar LLC	Methuen, MA	2 GWh	Aug 2021	Dec 2025	Solar
Danton XI Solar LLC	Danton XI Solar LLC	Methuen, MA	2 GWh	Dec 2013	Dec 2025	Solar
Methuen Landfill	CleanCapital Holdings	Methuen, MA	2 GWh	Jun 2013	Dec 2025	Solar
Ayers Village Solar	Altus Power America Management, LLC	Methuen, MA	3 GWh	May 2014	Dec 2025	Solar
Saratoga Solar III, LLC	Green Street Power Partners	Middle Grove, NY	5 GWh	Nov 2023	Dec 2025	Solar

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	442.5 GWh	4
#24	Dominion Energy South Carolina, Inc.	25.3 TWh	83
#13	Duke Energy Carolinas	112.6 TWh	577
#17	Duke Energy Progress East	64.5 TWh	565
#50	Duke Energy Progress West	4.5 TWh	15
#23	Louisville Gas and Electric Company and Kentucky Utilities Company	33.9 TWh	25
#12	New York Independent System Operator	134.3 TWh	1,299
#1	PJM Interconnection, LLC	882.8 TWh	2,652
#31	South Carolina Public Service Authority	18.5 TWh	35
#59	Southeastern Power Administration	1.3 TWh	11

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#7	California Independent System Operator	169.4 TWh	2,135
#9	Tennessee Valley Authority	163.4 TWh	207
#10	Florida Power & Light Co.	152.2 TWh	187
#12	New York Independent System Operator	134.3 TWh	1,299
#13	Duke Energy Carolinas	112.6 TWh	577
#15	ISO New England	111.1 TWh	1,629
#16	Bonneville Power Administration	91.6 TWh	167
#17	Duke Energy Progress East	64.5 TWh	565
#18	PacifiCorp East	60.9 TWh	222
#19	Salt River Project Agricultural Improvement and Power District	60.3 TWh	49