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	Jun 2025
Annual Generation	103.1 TWh
Power Plants	1,487
Utilities	782
Ranked #15 out of 65 in terms of net annual generation
Ranked #11 out of 53 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 57.2% Nuclear \| 24.7% Water \| 6.2% Other Fuel \| 4.5% Wind \| 3.7% Solar \| 1.4% Coal \| 0.3%

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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
Georges River Energy	Robbins Lumber Inc	Searsmont, ME	40 GWh	Nov 2018	Dec 2023	Wood/Wood Waste Solids
Robbins Lumber	Robbins Lumber Inc	Searsmont, ME	97 MWh	Dec 1980	Dec 2023	Distillate Fuel Oil
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Mar 2025	Natural Gas
Rhode Island Solar Renewable Energy IV, LLC	Rhode Island Solar Renewable Energy IV, LLC	Tiverton, RI	1 MWh	Nov 2023	Dec 2023	Solar
Ridgewood Providence Power	Rhode Island LFG Genco	Johnston, RI	10 GWh	Jul 2005	Dec 2023	Landfill Gas
Johnston LFG Turbine Plant	Rhode Island LFG Genco	Johnston, RI	187 GWh	Apr 2013	Mar 2025	Landfill Gas
Rhode Island Hospital	Rhode Island Hospital	Providence, RI	9 GWh	Sep 1974	Mar 2025	Natural Gas : 89.5% Residual Fuel Oil : 10.5%
Alton Road Solar	Revity Energy LLC	Bradford, RI	24 GWh	Nov 2019	Dec 2023	Solar
ReEnergy Stratton LLC	ReEnergy Stratton LLC	Stratton, ME	177 GWh	Oct 1989	Dec 2023	Wood/Wood Waste Solids
ReEnergy Livermore Falls	ReEnergy Livermore Falls	Livermore Falls, ME	223 GWh	Jul 1992	Dec 2023	Wood/Wood Waste Solids
Redbrook Community Solar 1	Redbrook Solar 1, LLC	Plympton, MA	10 GWh	Sep 2017	Dec 2023	Solar
Record Hill Wind	Record Hill Wind LLC	Roxbury, ME	111 GWh	Dec 2011	Dec 2023	Wind
Happy Hollow CSG Hybrid	REA Investments, LLC	Winchendon, MA	8 GWh	Sep 2019	Dec 2023	Solar
Washburn Road Solar	REA Investments, LLC	Freetown, MA	3 GWh	Nov 2018	Dec 2023	Solar
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	133 GWh	Mar 2005	Mar 2025	Natural Gas
Quinebaug Solar	Quinebaug Solar, LLC	Canterbury, CT	81 GWh	Nov 2021	Mar 2025	Solar
Quinebaug Lower Project	Quinebaug Associates LLC	Brooklyn, CT	10 GWh	Mar 1990	Dec 2023	Water
Williams College - Campus CHP	President & Trustees of Williams College	Williamstown, MA	2 GWh	Feb 2003	Dec 2023	Natural Gas : 93.7% Distillate Fuel Oil : 6.3%
Berkshire 1	PPS Berkshire Solar LLC	Sheffield, MA	2 GWh	Nov 2011	Dec 2023	Solar
Pontook Hydro Facility	Pontook Operating LP	Dummer, NH	58 GWh	Nov 1986	Dec 2023	Water
Pleasantdale Road Community Solar	Pleasantdale Road Solar, LLC	Rutland, MA	1 GWh	Aug 2017	Dec 2023	Solar
Plainfield Community Solar LLC	Plainfield Solar LLC	Plainfield, MA	3 GWh	Jan 2019	Dec 2023	Solar
Plainfield Renewable Energy LLC	Plainfield Renewable Energy, LLC	Plainfield, CT	234 GWh	Nov 2013	Dec 2023	Wood/Wood Waste Solids : 99.6%
Pittsfield Solar LLC	Pittsfiled Solar LLC	Pittsfield, ME	16 GWh	Nov 2017	Dec 2023	Solar
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	31 GWh	Jun 1990	Feb 2025	Natural Gas : 94.6% Distillate Fuel Oil : 5.4%
Pisgah Mountain Wind	Pisgah Mountain, LLC	Clifton, ME	24 GWh	Nov 2016	Dec 2023	Wind
Pfizer Groton Plant	Pfizer Inc	Groton, CT	80 GWh	Dec 1947	Mar 2025	Natural Gas : 94.7% Distillate Fuel Oil : 5.3%
Peterson Road Solar	Peterson Road Solar, LLC	Palmer, MA	4 GWh	Mar 2017	Dec 2023	Solar
Pepperidge Farm Bloomfield	Pepperidge Farm, Inc.- Bloomfield	Bloomfield, CT	16 GWh	Jul 2008	Dec 2023	Natural Gas
Pendleton Solar 1	Pendleton Solar 1, LLC	Lockport, NY	7 GWh	Sep 2020	Dec 2023	Solar
Partridgeville Hybrid CSG	Partridgeville Road Solar 1, LLC	Athol, MA	6 GWh	Dec 2019	Dec 2023	Solar
Gardner - Otter River Road	Otter River Road Solar LLC	Gardner, MA	4 GWh	Sep 2019	Dec 2023	Solar
MA Solar Storage 1 Hybrid	Origis Energy USA, Inc	Sterling, MA	1 GWh	Feb 2018	Dec 2023	Solar
Manchester Community College East	Onyx Asset Services Group	Manchester, CT	1 GWh	Sep 2018	Dec 2023	Solar
Manchester Community College North	Onyx Asset Services Group	Great Path, CT	2 GWh	Sep 2018	Dec 2023	Solar
Winchendon Landfill Solar	Onyx Asset Services Group	Winchendon, MA	3 GWh	Sep 2018	Dec 2023	Solar
Onyx - Pembroke Landfill Solar	Onyx Asset Services Group	Pembroke, MA	4 GWh	Nov 2017	Dec 2023	Solar
Barrett Farm Solar - Phase I	Onyx Asset Services Group	Thompson, CT	3 GWh	Sep 2017	Dec 2023	Solar
Onyx - Brockton Thatcher Landfill Solar CSG	Onyx Asset Services Group	Brockton, MA	4 GWh	Oct 2017	Dec 2023	Solar
Bingham Wind	Onward Energy	Bingham, ME	485 GWh	Nov 2016	Mar 2025	Wind
Somers Solar Center, LLC	Onward Energy	Somers, CT	8 GWh	Nov 2013	Dec 2023	Solar
Hancock Wind Plant	Onward Energy	T22 MD, ME	118 GWh	Nov 2016	Mar 2025	Wind
Oakfield Wind Project	Onward Energy	City of Oakfield, ME	355 GWh	Sep 2015	Mar 2025	Wind
Covanta Haverhill	Ogden Projects Inc-Haverhill	Haverhill, MA	298 GWh	Apr 1989	Mar 2025	Non-biogenic Municipal Solid Waste : 54.8% Biogenic Municipal Solid Waste : 44.8%
Ocean State Power II	Ocean State Power II	Harrisville, RI	1 TWh	Sep 1991	Dec 2023	Natural Gas : 99.7%
Ocean State Power	Ocean State Power Co	Harrisville, RI	1 TWh	Nov 1990	Dec 2023	Natural Gas : 99.6%
Bourne (MA) - Holliston I	NVT LICENSES, LLC	Holliston, MA	3 GWh	Nov 2014	Dec 2023	Solar
Nutmeg Solar	Nutmeg Solar LLC	Enfield, CT	33 GWh	Nov 2020	Dec 2023	Solar
Tolland Solar NG LLC	NuGen Capital Management	Tolland, MA	5 GWh	Sep 2014	Dec 2023	Solar
10 Briggs Solar NG, LLC (East)	NuGen Capital Management	East Greenwich, RI	8 GWh	May 2021	Dec 2023	Solar
265 Pleasant Solar NG, LLC	NuGen Capital Management	Lunenburg, MA	1 GWh	Jun 2014	Dec 2023	Solar
651 Chase Solar NG	NuGen Capital Management	Lunenburg, MA	4 GWh	May 2014	Dec 2023	Solar
Halifax Solar	NuGen Capital Management	Halifax, MA	4 GWh	Jul 2015	Dec 2023	Solar
301 Chestnut Solar NG	NuGen Capital Management	East Longmeadow, MA	2 GWh	Mar 2017	Dec 2023	Solar
580 River Solar	NuGen Capital Management	Winchendon, MA	4 GWh	Aug 2018	Dec 2023	Solar
Fairview Farms Solar	NuGen Capital Management	Whately, MA	3 GWh	May 2014	Dec 2023	Solar
433 Purchase Solar NG, LLC	NuGen Capital Management	Swansea, MA	4 GWh	Mar 2012	Dec 2023	Solar
Old Wardour Solar	NuGen Capital Management	East Brookfield, MA	7 GWh	Dec 2015	Dec 2023	Solar
Shuman Solar	NuGen Capital Management	Stoughton, MA	2 GWh	Mar 2016	Dec 2023	Solar
East Acres Solar NG, LLC	NuGen Capital Management	Pittsfield, MA	5 GWh	Mar 2017	Dec 2023	Solar
Vuelta Solar	NuGen Capital Management	East Brookfield, MA	7 GWh	Dec 2015	Dec 2023	Solar
Hadley Solar NG, LLC	NuGen Capital Management	Hadley, MA	3 GWh	Jun 2014	Dec 2023	Solar
Hatfield Solar PV	NSTAR Electric Company	Hatfield, MA	6 GWh	Nov 2018	Dec 2023	Solar
Montague Site 36-Grosolar	NSTAR Electric Company	Millers Falls, MA	6 GWh	Sep 2018	Mar 2025	Solar
Ludlow Site 72 - Conti	NSTAR Electric Company	Ludlow, MA	2 GWh	Jul 2018	Dec 2023	Solar
East Springfield Solar PV	NSTAR Electric Company	Springfield, MA	2 GWh	Sep 2018	Dec 2023	Solar
Sunderland Solar PV	NSTAR Electric Company	Sunderland, MA	2 GWh	Aug 2018	Dec 2023	Solar
Southwick Solar PV	NSTAR Electric Company	Southwick, MA	8 GWh	Dec 2018	Mar 2025	Solar
Savoy Solar PV	NSTAR Electric Company	Savoy, MA	3 GWh	Jan 2019	Dec 2023	Solar
Springfield Solar PV	NSTAR Electric Company	Springfield, MA	6 GWh	Dec 2018	Dec 2023	Solar
Southampton Solar PV	NSTAR Electric Company	Southampton, MA	3 GWh	Jan 2019	Dec 2023	Solar
Pittsfield 44 - M&W PV	NSTAR Electric Company	Pittsfield, MA	2 GWh	Jul 2018	Dec 2023	Solar
Lee Site 31 Solar	NSTAR Electric Company	Lee, MA	2 GWh	Jul 2018	Dec 2023	Solar
Plymouth Solar	NSTAR Electric Company	Plymouth, MA	1 GWh	May 2018	Dec 2023	Solar
Hinsdale Solar PV	NSTAR Electric Company	Hinsdale, MA	3 GWh	Dec 2018	Dec 2023	Solar
Greenfield Solar PV	NSTAR Electric Company	Greenfield, MA	3 GWh	Dec 2018	Dec 2023	Solar
East Longmeadow Solar PV	NSTAR Electric Company	East Longmeadow, MA	6 GWh	Sep 2019	Dec 2023	Solar
Wareham Solar PV	NSTAR Electric Company	Wareham, MA	1 GWh	Nov 2018	Dec 2023	Solar
Hampden Solar PV	NSTAR Electric Company	Hampden, MA	5 GWh	Oct 2019	Dec 2023	Solar
Renew Canal 1 CSG LLC	NRG Renew Canal 1 LLC	Sandwich, MA	2 GWh	May 2017	Dec 2023	Solar
Montville Station	NRG Montville Operations Inc	Uncasville, CT	36 GWh	Dec 1953	Dec 2023	Residual Fuel Oil : 65.3% Natural Gas : 33.4% Distillate Fuel Oil : 1.3%
Notus Wind 1	Notus Clean Energy LLC	E. Falmouth, MA	4 GWh	Jun 2010	Dec 2023	Wind
Norton Powerhouse 2	Norton Powerhouse 2	Worcester, MA	29 GWh	Oct 2022	Dec 2023	Natural Gas
Bellingham Cogeneration Facility	Northeast Energy Associates LP	Bellingham, MA	102 GWh	Aug 1991	Nov 2023	Natural Gas : 88.2% Distillate Fuel Oil : 11.8%
North Kingstown Solar LLC	North Kingstown Solar LLC	North Kingstown, RI	3 GWh	Aug 2022	Dec 2023	Solar
River Road	Norridgewock River Road Solar, LLC	Norridgewock, ME	8 GWh	Feb 2022	Dec 2023	Solar
Howard Lane Solar	NJR Clean Energy Ventures Corporation	Glocester, RI	842 MWh	Aug 2023	Dec 2023	Solar
Niagara Depot Solar	Niagara Depot Solar, LLC	Niagara Falls, NY	2 GWh	Jun 2023	Dec 2023	Solar
Lewiston Junction Road Solar	NextGrid Peppertree, LLC	Poland, ME	6 GWh	Dec 2021	Dec 2023	Solar
Webb Road Solar	NextGrid Mastic, LLC	Waterville, ME	5 GWh	Aug 2022	Dec 2023	Solar
Merrill Road Solar	NextGrid Mangrove, LLC	Lewiston, ME	6 GWh	Feb 2022	Dec 2023	Solar
Corkwood Solar (CSG)	NextGrid Corkwood, LLC	Howland, ME	344 MWh	Oct 2023	Dec 2023	Solar
Lisbon Street Solar	NextGrid Cliffrose, LLC	Lewiston, ME	3 GWh	Mar 2022	Dec 2023	Solar
Broadway Solar (CSG)	NextGrid Bitterbush, LLC	Bangor, ME	1 GWh	Aug 2023	Dec 2023	Solar
Granite Reliable Power	NexteraEnergy	Dummer, NH	198 GWh	Jan 2012	Mar 2025	Wind
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	Mar 2025	Nuclear
Upper Blackstone (MA) Treasure Valley	Nexamp Treasure Valley Solar, LLC	Rutland, MA	7 GWh	Jun 2014	Dec 2023	Solar
Nexamp Peak CSG	Nexamp Peak, LLC	Hancock, MA	2 GWh	Nov 2015	Dec 2023	Solar
Newton Rumford Landfill	Newton Municipal Solar LLC - Rumford	Newton, MA	3 GWh	Jun 2017	Dec 2023	Solar
China Mill Hydro	New Hampshire Hydro Associates	Allenstown, NH	4 GWh	Jun 1981	Dec 2023	Water

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	734.7 GWh	4
#25	Dominion Energy South Carolina, Inc.	26.1 TWh	85
#13	Duke Energy Carolinas	111.4 TWh	556
#17	Duke Energy Progress East	65.0 TWh	554
#52	Duke Energy Progress West	4.1 TWh	10
#24	Louisville Gas and Electric Company and Kentucky Utilities Company	33.8 TWh	20
#12	New York Independent System Operator	130.6 TWh	1,100
#1	PJM Interconnection, LLC	858.1 TWh	2,305
#29	South Carolina Public Service Authority	19.2 TWh	33
#60	Southeastern Power Administration	1.4 TWh	11

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#7	California Independent System Operator	190.4 TWh	1,943
#8	Tennessee Valley Authority	158.8 TWh	170
#10	Florida Power & Light Co.	148.6 TWh	159
#12	New York Independent System Operator	130.6 TWh	1,100
#13	Duke Energy Carolinas	111.4 TWh	556
#15	ISO New England	103.1 TWh	1,487
#16	Bonneville Power Administration	82.1 TWh	158
#17	Duke Energy Progress East	65.0 TWh	554
#18	Salt River Project Agricultural Improvement and Power District	58.7 TWh	45
#19	PacifiCorp East	57.3 TWh	204