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
Mariaville Road Elsworth Solar, LLC	REA Investments, LLC	Ellsworth, ME	1 GWh	Apr 2022	Dec 2025	Solar
Market Street Gardiner Solar, LLC	REA Investments, LLC	Gardiner, ME	6 GWh	Jun 2022	Dec 2025	Solar
Marlborough Solar	Marlborough Solar, LLC	Milton, NY	3 GWh	Feb 2021	Dec 2025	Solar
Mars Hill	Greenbacker Renewable Energy Corporation	Mars Hill, ME	4 GWh	Oct 2024	Dec 2025	Solar
Marshfield 6	Green Mountain Power Corp	Marshfield, VT	4 GWh	Dec 1926	Dec 2025	Water
Marshfield PV	Terraform Arcadia	Marshfield, MA	5 GWh	Nov 2013	Dec 2025	Solar
Marston Mills Solar	SoCore Energy LLC	Marstons Mills, MA	6 GWh	Nov 2021	Dec 2025	Solar
Mascoma Hydro	Green Mountain Power Corp	W. Lebanon, NH	202 MWh	Nov 1988	Dec 2025	Water
Mashpee Landfill Solar	Nautilus Solar Solutions	Mashpee, MA	2 GWh	Aug 2014	Dec 2025	Solar
Mass Inst Tech Cntrl Utilities/Cogen Plt	Massachusetts Inst of Tech	Cambridge, MA	209 GWh	May 1995	Dec 2025	Natural Gas
Mass Midstate Solar 1	Evergreen Wind, LLC	Warren, MA	7 GWh	Apr 2014	Dec 2025	Solar
Mass Midstate Solar 2	Evergreen Wind, LLC	Warren, MA	7 GWh	Apr 2014	Dec 2025	Solar
Mass Midstate Solar 3	Evergreen Wind, LLC	Warren, MA	6 GWh	Apr 2014	Dec 2025	Solar
Masspower	Masspower	Indian Orchard, MA	442 GWh	Jun 1993	Dec 2025	Natural Gas
Maynard PV	Terraform Arcadia	Maynard, MA	1 GWh	Dec 2013	Dec 2025	Solar
McAllister Landfill	Solar Breakers LLC	Portsmouth, RI	2 GWh	Sep 2022	Dec 2025	Solar
McDougle-Mitchell Solar Project Hybrid C	AES Distributed Energy	Charlton, MA	7 GWh	Jul 2020	Dec 2025	Solar
McHenry Solar	Ecos Energy LLC	Hampton, CT	2 GWh	Sep 2021	Dec 2025	Solar
Mcindoes	Great River Hydro, LLC	Barnet, VT	39 GWh	Dec 1930	Dec 2025	Water
MD - EDFR - Phase II - Lewiston	Hayworth Solar Partners, LLC	Lewiston, ME	8 GWh	Oct 2024	Dec 2025	Solar
MDFA Devens-Saratoga	Terraform Arcadia	Devens, MA	3 GWh	Feb 2016	Dec 2025	Solar
ME Augusta 13 York Farm Rd Solar	SOL ME Augusta 13 York Farm, LLC	Augusta, ME	1 GWh	Dec 2023	Dec 2025	Solar
ME CDG 004	ME CDG 004 LLC	Bangor, ME	3 GWh	Nov 2024	Dec 2025	Solar
ME CDG 005	ME CDG 005 LLC	Veazie, ME	3 GWh	Nov 2024	Dec 2025	Solar
ME - EDF - Phase II - Belfast	Shining Solar Partners, LLC	Belfast, ME	8 GWh	Aug 2024	Dec 2025	Solar
ME - EDFR - Phase I - Bristol	Overlook Solar Partners, LLC	Bristol, ME	9 GWh	Nov 2023	Dec 2025	Solar
ME-EDFR-Phase I-Embden	Tower Solar Partners, LLC	Embden, ME	8 GWh	Nov 2023	Dec 2025	Solar
ME-EDFR-Phase I-Woolwich	Green Mile Solar, LLC	Woolwich, ME	8 GWh	Aug 2023	Dec 2025	Solar
ME Fort Fairfield Solar Plant	ME Fort Fairfield LLC	Presque Isle, ME	4 GWh	Nov 2024	Dec 2025	Solar
ME Novel Lighthouse - Carrabassett	Luminace Sunbeam Development Holdings, LLC	Carrabassett Valley, ME	7 GWh	Nov 2023	Dec 2025	Solar
ME Novel Lighthouse - Front St. Solar CS	Luminace Sunbeam Development Holdings, LLC	Skowhegan, ME	5 GWh	Apr 2023	Dec 2025	Solar
ME Novel Lighthouse - Penobscot CSG	Luminace Sunbeam Development Holdings, LLC	Patten, ME	4 GWh	Aug 2024	Dec 2025	Solar
ME - Novel (Lighthouse Ph I) Mars Hill	Mars Hill Road Solar Farm, LLC	Westfield, ME	4 GWh	Jul 2024	Dec 2025	Solar
Meadow Solar	Altus Power America Management, LLC	Boston, MA	4 GWh	Nov 2016	Dec 2025	Solar
Mechanic Falls	KEI (Maine) Power Management (IV) LLC	Mechanic Falls, ME	2 GWh	Mar 1986	Dec 2025	Water
Mechanic Street (CSG)	Nautilus Solar Solutions	Presque Island, ME	4 GWh	Nov 2024	Dec 2025	Solar
Medical Area Total Energy Plant	MATEP LLC	Boston, MA	318 GWh	Dec 1979	Dec 2024	Natural Gas : 98.3% Distillate Fuel Oil : 1.7%
Medtronic - New Haven	Bloom Energy	North Haven, CT	18 GWh	Sep 2020	Dec 2025	Natural Gas
Medtronic - New Haven 2	Bloom Energy	North Haven, CT	17 GWh	Sep 2020	Dec 2025	Natural Gas
Medway Grid	Medway Grid LLC	Medway, MA	20 GWh	-	May 2026	Electricity used for energy storage
Medway Hydro	Brookfield Black Bear Hydro, LLC	Medway, ME	23 GWh	Dec 1922	Dec 2025	Water
Mendon	BWC Box Pond LLC	Mendon, MA	4 GWh	Nov 2017	Dec 2024	Solar
Merrill Road Solar	NextGrid Mangrove, LLC	Lewiston, ME	6 GWh	Feb 2022	Dec 2025	Solar
Merrimac Solar	RWE Clean Energy	Merrimac, MA	2 GWh	Nov 2013	Dec 2025	Solar
Merrimack	Granite Shore Power	Bow, NH	116 GWh	Nov 1960	May 2026	Bituminous Coal : 97.6% Jet Fuel : 2.3%
Merrimack Solar Farm, LLC	Merrimack Solar Farm	Merrimack, NH	3 GWh	Dec 2018	Dec 2025	Solar
Messalonskee 2 (Oakland)	Messalonskee Stream Hydro LLC	Oakland, ME	7 GWh	Dec 1923	Dec 2025	Water
Messalonskee 3	Messalonskee Stream Hydro LLC	Oakland, ME	4 GWh	Dec 1917	Dec 2025	Water
Messalonskee 5	Messalonskee Stream Hydro LLC	Waterville, ME	4 GWh	Dec 1934	Dec 2025	Water
Methuen Landfill	CleanCapital Holdings	Methuen, MA	2 GWh	Jun 2013	Dec 2025	Solar
MEVS Clark LLC	MEVS Clark LLC	Bingham, ME	6 GWh	Sep 2023	Dec 2025	Solar
MEVS DOT 109	MEVS DOT, LLC	Augusta, ME	4 GWh	Jun 2023	Dec 2025	Solar
MEVS Waterhouse	MEVS LLC	Scarborogh, ME	3 GWh	Nov 2024	Dec 2025	Solar
MHG Wallingford	Standard Solar	Wallingford, VT	3 GWh	Nov 2019	Dec 2025	Solar
Middlebury College	Middlebury College Biomass	Middlebury, VT	2 GWh	Dec 1979	May 2026	Wood/Wood Waste Solids : 60.7% Natural Gas : 39.3%
Middlesex 2	Green Mountain Power Corp	Moretown, VT	6 GWh	Dec 1927	Dec 2025	Water
Middleton Solar Park	Novis Renewables, LLC	Middleton, MA	7 GWh	May 2018	Dec 2024	Solar
Middletown	Middletown Power LLC	Middletown, CT	33 GWh	Sep 1958	Dec 2024	Residual Fuel Oil : 60.6% Natural Gas : 39.3%
Milford Hydro Station	Brookfield Black Bear Hydro, LLC	Milford, ME	36 GWh	Jun 1941	Dec 2025	Water
Milford Power LP	Milford Power LLC	Milford, MA	253 GWh	Feb 1993	Dec 2025	Natural Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	3 TWh	Jan 2004	May 2026	Natural Gas
Millbury MA #1092	Millbury MA #1092 LLC	Millbury, MA	2 GWh	May 2019	Dec 2025	Solar
Millbury Solar	Evergreen Wind, LLC	Millbury, MA	5 GWh	Mar 2014	Dec 2025	Solar
Millennium Power	Millennium Power Company, LLC	Charlton, MA	995 GWh	Mar 2001	May 2026	Natural Gas
Millis MA 1	Millis MA 1 LLC	Millis, MA	2 GWh	Oct 2018	Dec 2025	Solar
Millstone	Dominion Energy Nuclear Conn Inc	Waterford, CT	17 TWh	Nov 1975	May 2026	Nuclear
Milo CSG	Milo CSG, LLC	Milo, ME	7 GWh	Jan 2022	Dec 2025	Solar
Milo PV - BD Solar 1 LLC	BD Solar 1 LLC	Milo, ME	25 GWh	May 2021	Dec 2025	Solar
Milton	Green Mountain Power Corp	Milton, VT	34 GWh	Jan 1929	Dec 2025	Water
Milton Hydro	SFR Hydro Cor	Milton, NH	5 GWh	Dec 1913	Dec 2025	Water
Mine Falls Generating Station	City of Nashua - (NH)	Nashua, NH	9 GWh	Nov 1985	Dec 2025	Water
Missile Street (CSG)	Nautilus Solar Solutions	Presque Island, ME	4 GWh	Nov 2024	Dec 2025	Solar
MM Taunton Energy	MM Taunton Energy LLC	Taunton, MA	7 GWh	Aug 1997	Dec 2025	Landfill Gas
MMWAC Resource Recovery Facility	Maine Waste to Energy	Auburn, ME	8 GWh	May 1992	May 2026	Non-biogenic Municipal Solid Waste : 54.0% Biogenic Municipal Solid Waste : 44.2% Natural Gas : 1.8%
MMWEC Simple Cycle Gas Turbine	Massachusetts Mun Wholes Electric Co	Peabody, MA	8 GWh	Jun 2024	Dec 2025	Distillate Fuel Oil : 69.0% Natural Gas : 31.0%
Monmouth	Maine DG Solar Monmouth, LLC	Monmouth, ME	9 GWh	Feb 2022	Dec 2025	Solar
Monson Solar	Altus Power America Management, LLC	Monson, MA	4 GWh	Jun 2014	Dec 2025	Solar
Monson Solar, LLC	Monson Solar, LLC	Monson, MA	3 GWh	Jul 2017	Dec 2025	Solar
Montague Road Solar	Montague Road Solar, LLC	Amherst, MA	4 GWh	Nov 2019	Dec 2025	Solar
Montague Site 36-Grosolar	NSTAR Electric Company	Millers Falls, MA	6 GWh	Sep 2018	May 2026	Solar
Montville Station	Montville Power LLC	Uncasville, CT	133 GWh	Dec 1953	Dec 2025	Residual Fuel Oil : 74.2% Natural Gas : 24.9% Distillate Fuel Oil : 0.9%
Monument Valley	LSE Lepus LLC	Great Barrington, MA	3 GWh	Dec 2021	Dec 2024	Solar
Morin Solar 2013 LLC	CVI CleanCapital Solar 6	Warren, MA	5 GWh	Nov 2013	Dec 2025	Solar
Morrisville	Village of Morrisville - (VT)	Morrisville, VT	5 GWh	Jul 1924	Dec 2025	Water
Moscow	Greenbacker Renewable Energy Corporation	Moscow, ME	112 GWh	May 2025	May 2026	Wind
Mt. Tom Solar Project Hybrid	Mt. Tom Solar, LLC	Holyoke, MA	4 GWh	Dec 2016	Dec 2025	Solar
Mt Wachusett Community College	Mt Wachusett Community College	Gardner, MA	4 GWh	Feb 2011	May 2026	Wind
Naples	Naples Casco Solar 1, LLC	Naples, ME	3 GWh	Nov 2021	Dec 2025	Solar
Nashua Plant	NextEra Renewable Fuels, LLC	Nashua, NH	13 GWh	Mar 1996	Dec 2025	Landfill Gas
Natick Mall	Natick Mall	Natick, MA	4 GWh	Dec 2014	Dec 2024	Solar
Nationwide	Nationwide Solar Energy LLC	Lancaster, MA	5 GWh	May 2021	Dec 2025	Solar
Nautilus Goat Island Solar LLC (CSG)	Nautilus Solar Solutions	Burrillville, RI	4 GWh	Jul 2019	Dec 2025	Solar
Naval Sub Base New London Fuel Cell	Groton Station Fuel Cell, LLC	Groton, CT	44 GWh	Nov 2022	Dec 2024	Natural Gas
NBC Field's Point Wind Farm	Narragansett Bay Commission	Providence, RI	7 GWh	Sep 2012	May 2026	Wind
NE Renewable Fitchburg, LLC	NE Renewable Fitchburg, LLC	Westminster, MA	79 GWh	Jul 1992	Dec 2025	Wood/Wood Waste Solids : 98.7% Natural Gas : 1.3%
NE Renewable Power Jonesboro	Stored Solar J&WE	Jonesboro, ME	16 MWh	Nov 1987	Jun 2025	Gaseous Propane : 66.7% Wood/Wood Waste Solids : 33.3%
NE Renewable Power West Enfield	Stored Solar J&WE	West Enfield, ME	43 GWh	Nov 1987	Dec 2025	Wood/Wood Waste Solids
NE Renewable Springfield, LLC	NE Renewable Springfield, LLC	Springfield, NH	73 GWh	Nov 1987	Dec 2025	Wood/Wood Waste Solids
NE Renewable Tamworth, LLC	NE Renewable Tamworth, LLC	Tamworth, NH	78 GWh	Nov 1987	Dec 2025	Wood/Wood Waste Solids
NE Renewable Whitefield, LLC	NE Renewable Whitefield, LLC	Whitefield, NH	59 GWh	Feb 1988	Dec 2025	Wood/Wood Waste Solids

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