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
Bowden Solar LLC	38DN Power Fund 1 LLC	Monson, MA	3 GWh	Feb 2019	Dec 2024	Solar
Monson Solar, LLC	Monson Solar, LLC	Monson, MA	3 GWh	Jul 2017	Dec 2024	Solar
Monson Solar	Altus Power America Management, LLC	Monson, MA	4 GWh	Jun 2014	Dec 2024	Solar
Comerford	Great River Hydro, LLC	Monroe, NH	400 GWh	Aug 1930	Dec 2024	Water
Stevenson	FirstLight Power Resources Services LLC	Monroe, CT	96 GWh	Dec 1918	Dec 2024	Water
Monmouth	Maine DG Solar Monmouth, LLC	Monmouth, ME	9 GWh	Feb 2022	Dec 2024	Solar
Clemons Road Solar	RPNY Solar 4, LLC	Minoa, NY	1 GWh	Jun 2024	Dec 2024	Solar
GMP Solar/Storage-Milton Hybrid	Green Mountain Power Corp	Milton, VT	7 GWh	Aug 2019	Sep 2025	Solar : 98.6% Electricity used for energy storage : 1.4%
Peterson	Green Mountain Power Corp	Milton, VT	31 GWh	Jan 1948	Dec 2024	Water
Georgia Mountain Community Wind Farm	Greenbacker Renewable Energy Corporation	Milton, VT	30 GWh	Nov 2012	Sep 2025	Wind
Milton	Green Mountain Power Corp	Milton, VT	44 GWh	Jan 1929	Dec 2024	Water
Clark Falls	Green Mountain Power Corp	Milton, VT	17 GWh	Jan 1937	Dec 2024	Water
Marlborough Solar	Marlborough Solar, LLC	Milton, NY	3 GWh	Feb 2021	Dec 2024	Solar
Milton Hydro	SFR Hydro Cor	Milton, NH	6 GWh	Dec 1913	Dec 2024	Water
Milo PV - BD Solar 1 LLC	BD Solar 1 LLC	Milo, ME	31 GWh	May 2021	Dec 2024	Solar
Milo CSG	Milo CSG, LLC	Milo, ME	7 GWh	Jan 2022	Dec 2024	Solar
Millis MA 1	Millis MA 1 LLC	Millis, MA	2 GWh	Oct 2018	Dec 2024	Solar
Great Lakes Hydro America - ME	Great Lakes Hydro America LLC	Millinocket, ME	571 GWh	Jun 1917	Dec 2024	Water
Montague Site 36-Grosolar	NSTAR Electric Company	Millers Falls, MA	6 GWh	Sep 2018	Sep 2025	Solar
Millbury Solar	Evergreen Wind, LLC	Millbury, MA	4 GWh	Mar 2014	Dec 2024	Solar
Wheelabrator Millbury Facility	Wheelabrator Environmental Systems	Millbury, MA	318 GWh	Aug 1987	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Syncarpha Millbury Hybrid (CSG)	Syncarpha Millbury, LLC	Millbury, MA	8 GWh	Sep 2022	Dec 2024	Solar
3Colton	Madison Energy Holdings LLC	Millbury, MA	5 GWh	Jun 2023	Dec 2024	Solar
Millbury MA #1092	Millbury MA #1092 LLC	Millbury, MA	2 GWh	May 2019	Dec 2024	Solar
Milford Power LP	Milford Power LLC	Milford, MA	253 GWh	Feb 1993	Dec 2024	Natural Gas
Milford Hydro Station	Brookfield Black Bear Hydro, LLC	Milford, ME	37 GWh	Jun 1941	Dec 2024	Water
Milford Power Project	Milford Power Co LLC	Milford, CT	4 TWh	Jan 2004	Sep 2025	Natural Gas
GenConn Devon LLC	GenConn Devon LLC	Milford, CT	4 GWh	May 2010	Dec 2024	Kerosene : 90.3% Natural Gas : 9.7%
Dynamic Energy CT STAG	Milford Pepes Farm Road Solar LLC	Milford, CT	2 GWh	Jul 2023	Dec 2024	Solar
CP Middletown Solar I LLC	Green Street Power Partners	Middletown, CT	2 GWh	Nov 2019	Dec 2024	Solar
CP Middletown Solar II LLC	Green Street Power Partners	Middletown, CT	2 GWh	Nov 2019	Dec 2024	Solar
FDX010.0 FedEx Fuel Cell	2016 ESA Project Company, LLC	Middletown, CT	8 GWh	Aug 2018	Dec 2024	Natural Gas
FedEx Middletown	VCP Realty, LLC	Middletown, CT	151 MWh	Oct 2024	Dec 2024	Solar
GenConn Middletown LLC	GenConn Middletown LLC	Middletown, CT	6 GWh	May 2011	Dec 2024	Kerosene : 57.4% Natural Gas : 42.6%
Wesleyan University Cogen 1	Wesleyan University	Middletown, CT	7 GWh	Jan 2009	Dec 2024	Natural Gas
Kleen Energy Systems Project	Kleen Energy Systems, LLC	Middletown, CT	3 TWh	Jun 2011	Sep 2025	Natural Gas : 99.3% Distillate Fuel Oil : 0.7%
Middletown	Middletown Power LLC	Middletown, CT	33 GWh	Sep 1958	Dec 2024	Residual Fuel Oil : 60.6% Natural Gas : 39.3%
Middleton Solar Park	HG Solar Development, LLC	Middleton, MA	7 GWh	May 2018	Dec 2024	Solar
South Street - Middlebury	Greenbacker Renewable Energy Corporation	Middlebury, VT	3 GWh	Nov 2023	Dec 2024	Solar
Middlebury College	Middlebury College Biomass	Middlebury, VT	2 GWh	Dec 1979	Sep 2025	Wood/Wood Waste Solids : 62.2% Natural Gas : 37.8%
Lower Middlebury	Green Mountain Power Corp	Middlebury Lower, VT	4 GWh	Jul 1917	Dec 2024	Water
Cranberry Solar	GWE Cranberry Solar RT, LLC	Middleborough, MA	1 GWh	Nov 2016	Dec 2024	Solar
115 G Fisher	Greenbacker Renewable Energy Corporation	Middleborough, MA	1 GWh	Sep 2015	Dec 2024	Solar
154 D Fisher	Greenbacker Renewable Energy Corporation	Middleborough, MA	2 GWh	Nov 2015	Dec 2024	Solar
Saratoga Solar III, LLC	Green Street Power Partners	Middle Grove, NY	6 GWh	Nov 2023	Dec 2024	Solar
Aegean Drive Solar	Aegean Drive Solar LLC	Methuen, MA	3 GWh	Aug 2021	Dec 2024	Solar
Ayers Village Solar	Altus Power America Management, LLC	Methuen, MA	3 GWh	May 2014	Dec 2024	Solar
Methuen Landfill	CleanCapital Holdings	Methuen, MA	2 GWh	Jun 2013	Dec 2024	Solar
Merrimack Solar Farm, LLC	Merrimack Solar Farm	Merrimack, NH	4 GWh	Dec 2018	Dec 2024	Solar
Merrimac Solar	Consolidated Edison Development Inc.	Merrimac, MA	2 GWh	Nov 2013	Dec 2024	Solar
BWC Wading River One, Two, Three CSG	Ameresco BWC Wading River LLC	Mendon, MA	5 GWh	Oct 2017	Dec 2024	Solar
BWC Muddy Brook, LLC Hybrid	AES Distributed Energy	Mendon, MA	2 GWh	Aug 2021	Dec 2024	Solar
Mendon	BWC Box Pond LLC	Mendon, MA	4 GWh	Nov 2017	Dec 2024	Solar
Exelon West Medway II LLC	Constellation Power, Inc	Medway, MA	171 GWh	Feb 2019	Sep 2025	Natural Gas : 97.7% Kerosene : 2.3%
Exelon Medway LLC	Constellation Power, Inc	Medway, MA	2 GWh	Jun 1970	Dec 2024	Distillate Fuel Oil
Medway Hydro	Brookfield Black Bear Hydro, LLC	Medway, ME	23 GWh	Dec 1922	Dec 2024	Water
Mechanic Falls	KEI (Maine) Power Management (IV) LLC	Mechanic Falls, ME	2 GWh	Mar 1986	Dec 2024	Water
Maynard PV	Terraform Arcadia	Maynard, MA	1 GWh	Dec 2013	Dec 2024	Solar
BWC Origination 18	BWC Origination 18, LLC	Mattapoisett, MA	8 GWh	Nov 2018	Dec 2024	Solar
DG Crystal Spring CSG	DG Crystal Spring LLC	Mattapoisett, MA	7 GWh	Jun 2017	Dec 2024	Solar
Mashpee Landfill Solar	Nautilus Solar Solutions	Mashpee, MA	2 GWh	Aug 2014	Dec 2024	Solar
118 Echo	Madison Energy Investments LLC	Mashpee, MA	4 MWh	Jun 2023	Dec 2024	Solar
Foxwoods CoGen	Foxwoods Resort Casino	Mashantucket, CT	11 GWh	May 2010	Dec 2024	Natural Gas
Barnstable Landfill	Clean Focus Yield, LLC	Marstons Mills, MA	5 GWh	Aug 2014	Dec 2024	Solar
Marston Mills Solar	SoCore Energy LLC	Marstons Mills, MA	6 GWh	Nov 2021	Dec 2024	Solar
Marshfield 6	Green Mountain Power Corp	Marshfield, VT	8 GWh	Dec 1926	Dec 2024	Water
Marshfield PV	Terraform Arcadia	Marshfield, MA	5 GWh	Nov 2013	Dec 2024	Solar
Emerald Marshfields, LLC	Emerald Marshfield, LLC	Marshfield, MA	2 GWh	Nov 2022	Dec 2024	Solar
Mars Hill	Greenbacker Renewable Energy Corporation	Mars Hill, ME	95 MWh	Oct 2024	Dec 2024	Solar
GSPP 7024 Fox Rd, LLC	Green Street Power Partners	Marcy, NY	8 GWh	Apr 2023	Dec 2024	Solar
Wilkins Station	Town of Marblehead - (MA)	Marblehead, MA	94 MWh	Oct 1975	Dec 2024	Distillate Fuel Oil
Kenmare - Mansfield Branch Street	MN8 Energy LLC	Mansfield, MA	2 GWh	May 2017	Dec 2024	Solar
Amoskeag	Central Rivers Power NH, LLC	Manchester, NH	77 GWh	Jul 1922	Dec 2024	Water
Treasure Lane Solar 1	AES Clean Energy	Manchester, ME	7 GWh	Apr 2023	Dec 2024	Solar
Manchester Community College East	Onyx Asset Services Group	Manchester, CT	2 GWh	Sep 2018	Dec 2024	Solar
Anson Abenaki Hydros	Eagle Creek Renewable Energy, LLC	Madison, ME	116 GWh	Dec 1949	Dec 2024	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 2024	Solar
General Electric Aircraft Engines	General Electric Aircraft Engines	Lynn, MA	2 GWh	Dec 1947	Sep 2025	Solar
Great Falls (VT)	The Town of Lyndon Electric Department	Lyndon, VT	3 GWh	Jul 1915	Dec 2024	Water
GSPP Gilman, LLC	Green Street Power Partners	Lunenburg, VT	3 GWh	Aug 2018	Dec 2024	Solar
Electric Avenue Lunenburg Solar 1	Electric Avenue Lunenburg Solar 1, LLC	Lunenburg, MA	3 GWh	Nov 2021	Dec 2024	Solar
651 Chase Solar NG	NuGen Capital Management	Lunenburg, MA	4 GWh	May 2014	Dec 2024	Solar
265 Pleasant Solar NG, LLC	NuGen Capital Management	Lunenburg, MA	1 GWh	Jun 2014	Dec 2024	Solar
Settlers Solar	Settlers Solar, LLC	Lunenberg, MA	8 GWh	Nov 2020	Dec 2024	Solar
Coolidge Solar 1, LLC	Coolidge Solar I, LLC	Ludlow, VT	24 GWh	Nov 2018	Sep 2025	Solar
Stony Brook	Massachusetts Mun Wholes Electric Co	Ludlow, MA	125 GWh	Oct 1981	Sep 2025	Natural Gas : 74.6% Distillate Fuel Oil : 25.4%
Putts Bridge	Central Rivers Power MA, LLC	Ludlow, MA	16 GWh	Dec 1917	Dec 2024	Water
Ludlow Landfill	CleanCapital Holdings	Ludlow, MA	3 GWh	Jul 2013	Dec 2024	Solar
Ludlow Site 72 - Conti	NSTAR Electric Company	Ludlow, MA	2 GWh	Jul 2018	Dec 2024	Solar
Kearsarge Ludlow LLC	Kearsarge Ludlow LLC	Ludlow, MA	6 GWh	Nov 2020	Dec 2024	Solar
Huxley Solar	Huxley Solar, LLC	Ludlow, MA	10 GWh	Nov 2022	Dec 2024	Solar
Kingdom Community Wind	Green Mountain Power Corp	Lowell, VT	180 GWh	Oct 2012	Sep 2025	Wind
Boott Hydropower	Boott Hydro, LLC - Hybrid	Lowell, MA	28 GWh	Sep 1985	Dec 2024	Water
Lowell Solar Landfill	Heliovaas LLC	Lowell, MA	1 GWh	Nov 2013	Dec 2024	Solar
Pumpkin Hill	KEI (Maine) Power Management (II) LLC	Lowell, ME	3 GWh	Feb 1987	Dec 2024	Water
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	3 TWh	Feb 2003	Sep 2025	Natural Gas
Pendleton Solar 1	Pendleton Solar 1, LLC	Lockport, NY	8 GWh	Sep 2020	Dec 2024	Solar
Livermore Falls CSG	Livermore Falls CSG, LLC	Livermore Falls, ME	5 GWh	Apr 2022	Dec 2024	Solar
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	28 GWh	Dec 1984	Sep 2025	Water

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