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
Bridgewater Power LP	Bridgewater Power Co LP	Bridgewater, NH	103 GWh	Jul 1987	Dec 2025	Wood/Wood Waste Solids : 99.8%
Wheelabrator Millbury Facility	Wheelabrator Environmental Systems	Millbury, MA	288 GWh	Aug 1987	May 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Pejepscot Hydroelectric Project	Topsham Hydro Partners	Topsham, ME	50 GWh	Oct 1987	Dec 2025	Water
Benton Falls Associates	Essex Hydro Associates LLC	Benton, ME	10 GWh	Nov 1987	Dec 2025	Water
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
Rolfe Canal Hydro	Briar-Hydro Associates	Penacook, NH	16 GWh	Nov 1987	Dec 2025	Water
Covanta Bristol Energy	Covanta Bristol Inc	Bristol, CT	109 GWh	Nov 1987	May 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
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
West Enfield Hydro	Brookfield Black Bear Hydro, LLC	West Enfield, ME	70 GWh	Mar 1988	Dec 2025	Water
Regional Waste Systems	Ecomaine	Portland, ME	87 GWh	May 1988	May 2026	Non-biogenic Municipal Solid Waste : 54.6% Biogenic Municipal Solid Waste : 44.7% Natural Gas : 0.7%
Aziscohos Hydroelectric Project	Brookfield White Pine Hydro LLC	Wilson Mills, ME	30 GWh	May 1988	Dec 2025	Water
Sheldon Springs Hydroelectric	Central Rivers Power US, LLC	Sheldon Springs, VT	52 GWh	Jun 1988	Dec 2025	Water
SEMASS Resource Recovery	SEMASS Partnership	West Wareham, MA	553 GWh	Jun 1988	May 2026	Non-biogenic Municipal Solid Waste : 54.0% Biogenic Municipal Solid Waste : 44.2% Natural Gas : 1.7%
Wheelabrator Bridgeport	Wheelabrator Environmental Systems	Bridgeport, CT	430 GWh	Jun 1988	May 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Hartford Hospital Cogeneration	Cartier Energy, LLC	Hartford, CT	39 GWh	Jun 1988	Dec 2024	Natural Gas
Huntington Falls	Green Mountain Power Corp	Weybridge, VT	12 GWh	Sep 1988	Dec 2025	Water
Mascoma Hydro	Green Mountain Power Corp	W. Lebanon, NH	202 MWh	Nov 1988	Dec 2025	Water
Derby Hydro	McCallum Enterprises I LP	Shelton, CT	23 GWh	Dec 1988	Dec 2025	Water
Hydro Kennebec Project	Hydro Kennebec LLC	Winslow, ME	37 GWh	Dec 1988	Nov 2025	Water
Worumbo Hydro Station	Eagle Creek Renewable Energy, LLC	Lisbon Falls, ME	74 GWh	Jan 1989	Dec 2025	Water
Wheelabrator Concord Facility	Wheelabrator Environmental Systems	Concord, NH	93 GWh	Mar 1989	May 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Covanta Haverhill	Ogden Projects Inc-Haverhill	Haverhill, MA	287 GWh	Apr 1989	May 2026	Non-biogenic Municipal Solid Waste : 52.8% Biogenic Municipal Solid Waste : 43.2% Distillate Fuel Oil : 4.1%
Deweys Mill	Green Mountain Power Corp	White River Jct., VT	2 GWh	May 1989	Dec 2025	Water
Brassua Hydroelectric Project	Brassua Hydroelectric LP	Rockwood, ME	13 GWh	Aug 1989	Aug 2025	Water
ReEnergy Stratton LLC	ReEnergy Stratton LLC	Stratton, ME	200 GWh	Oct 1989	Dec 2025	Wood/Wood Waste Solids
Hillsborough Hosiery	Silverstreet Hydro	Hillsboro, NH	2 GWh	Nov 1989	Dec 2024	Water
Charles E Monty	Brookfield White Pine Hydro LLC	Lewiston, ME	114 GWh	Dec 1989	Dec 2025	Water
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	400 GWh	Dec 1989	May 2026	Black Liquor : 55.5% Tire-derived Fuels : 20.6% Wood/Wood Waste Solids : 16.0% Bituminous Coal : 6.1% Residual Fuel Oil : 1.2% Sludge Waste : 0.7%
Algonquin Windsor Locks	Ahlstrom Power Windsor Locks LLC	Windsor Locks, CT	147 GWh	Dec 1989	May 2026	Natural Gas : 92.2% Distillate Fuel Oil : 7.8%
Quinebaug Lower Project	Quinebaug Associates LLC	Brooklyn, CT	5 GWh	Mar 1990	Dec 2025	Water
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	136 GWh	Jun 1990	May 2026	Natural Gas : 96.9% Distillate Fuel Oil : 3.1%
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	May 2026	Nuclear
Dodge Falls Associates	Dodge Falls Associates LP	Bath, NH	22 GWh	Nov 1990	Dec 2025	Water
Ocean State Power	Ocean State Power Co	Harrisville, RI	1 TWh	Nov 1990	Dec 2025	Natural Gas : 99.7%
Bellingham Cogeneration Facility	Northeast Energy Associates LP	Bellingham, MA	368 GWh	Aug 1991	Dec 2024	Natural Gas : 99.9%
Ocean State Power II	Ocean State Power II	Harrisville, RI	577 GWh	Sep 1991	Dec 2025	Natural Gas : 99.9%
Covanta Southeastern Connecticut Company	Covanta Southeastern Connecticut Company	Preston, CT	108 GWh	Nov 1991	May 2026	Non-biogenic Municipal Solid Waste : 53.9% Biogenic Municipal Solid Waste : 44.1% Distillate Fuel Oil : 2.1%
Pratt & Whitney	United Technologies	East Hartford, CT	76 GWh	Dec 1991	May 2026	Natural Gas
Turnkey Landfill Gas Recovery	WM Renewable Energy LLC	Rochester, NH	39 GWh	Jan 1992	Dec 2025	Landfill Gas
Dartmouth Power Associates LP	Dartmouth Energy Center	Dartmouth, MA	89 GWh	Feb 1992	Dec 2025	Natural Gas : 96.7% Distillate Fuel Oil : 3.3%
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%
ReEnergy Livermore Falls	ReEnergy Livermore Falls	Livermore Falls, ME	274 GWh	Jul 1992	Dec 2025	Wood/Wood Waste Solids
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%
Ryegate Associates, LLC	Ryegate Associates, LLC	East Ryegate, VT	158 GWh	Aug 1992	Dec 2025	Wood/Wood Waste Solids
Milford Power LP	Milford Power LLC	Milford, MA	253 GWh	Feb 1993	Dec 2025	Natural Gas
Chace Mill Winooski One	City of Burlington Electric - (VT)	Winooski, VT	17 GWh	Mar 1993	Dec 2025	Water
Masspower	Masspower	Indian Orchard, MA	442 GWh	Jun 1993	Dec 2025	Natural Gas
CCSU Co-Gen-STBY Gen	Central Connecticut State University	New Britain, CT	10 MWh	Sep 1993	Dec 2025	Natural Gas
Lower Village Water Power Project	Sugar River Power LLC	Claremont, NH	3 GWh	Apr 1995	Dec 2025	Water
Mass Inst Tech Cntrl Utilities/Cogen Plt	Massachusetts Inst of Tech	Cambridge, MA	209 GWh	May 1995	Dec 2025	Natural Gas
Deer Island Treatment Plant	Massachusetts Wtr Rauth-Deer I	Winthrop, MA	33 GWh	Jul 1995	May 2026	Other Biomass Gas : 82.5% Distillate Fuel Oil : 13.1% Wind : 2.7% Solar : 1.8%
Manchester Street	Manchester Street, LLC.	Providence, RI	2 TWh	Aug 1995	May 2026	Natural Gas : 92.2% Distillate Fuel Oil : 7.8%
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%
Nashua Plant	NextEra Renewable Fuels, LLC	Nashua, NH	13 GWh	Mar 1996	Dec 2025	Landfill Gas
Searsburg Wind Turbine	Green Mountain Power Corp	Searsburg, VT	10 GWh	May 1997	May 2026	Wind
MM Taunton Energy	MM Taunton Energy LLC	Taunton, MA	7 GWh	Aug 1997	Dec 2025	Landfill Gas
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	3 TWh	May 1998	May 2026	Natural Gas
Dighton Power Plant	Dighton Power, LLC	Dighton, MA	276 GWh	Apr 1999	Dec 2025	Natural Gas
Berkshire Power	Berkshire Power Co LLC	Agawam, MA	810 GWh	Aug 1999	Dec 2025	Natural Gas
Tiverton Power Plant	Tiverton Power LLC	Tiverton, RI	2 TWh	Feb 2000	Dec 2025	Natural Gas
Maine Independence Station	Casco Bay Energy Co LLC	Veazie, ME	1 TWh	Apr 2000	Dec 2025	Natural Gas
Rumford Power LLC	Rumford Power	Rumford, ME	793 GWh	Jun 2000	Dec 2025	Natural Gas
Millennium Power	Millennium Power Company, LLC	Charlton, MA	995 GWh	Mar 2001	May 2026	Natural Gas
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	4 TWh	Apr 2001	May 2026	Natural Gas
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	3 TWh	May 2001	May 2026	Natural Gas
Wallingford Energy	Wallingford Energy LLC	Wallingford, CT	107 GWh	Jul 2001	Dec 2025	Natural Gas
Granby LFG	Industrial Power Services Corp.	Granby, MA	2 GWh	Aug 2001	Dec 2025	Landfill Gas
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	May 2026	Natural Gas
Stamford Health Tully Health Center	Stamford Health Tully Health Center	Stamford, CT	5 GWh	Apr 2002	Dec 2025	Natural Gas
Newington Energy Center	Essential Power Operating Services, LLC	Newington, NH	2 TWh	Sep 2002	May 2026	Natural Gas : 92.8% Distillate Fuel Oil : 7.2%
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	4 TWh	Sep 2002	Apr 2026	Natural Gas
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	May 2026	Natural Gas
Bradley Energy Center	Ameresco Select Inc	Windsor Locks, CT	11 GWh	Oct 2002	Dec 2025	Natural Gas
Toray Plastic America's CHP Plant	Toray Plastics America	North Kingstown, RI	157 GWh	Dec 2002	Dec 2025	Natural Gas
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	4 TWh	Feb 2003	May 2026	Natural Gas
Williams College - Campus CHP	President & Trustees of Williams College	Williamstown, MA	3 GWh	Feb 2003	Dec 2025	Natural Gas : 98.4% Distillate Fuel Oil : 1.6%
Waterside Power, LLC	Waterside Power, LLC	Stamford, CT	2 GWh	May 2003	Dec 2025	Distillate Fuel Oil
Fore River Generating Station	Calpine Fore River Energy Center, LLC	North Weymouth, MA	3 TWh	Jul 2003	May 2026	Natural Gas : 92.7% Distillate Fuel Oil : 7.3%
Ameresco Chicopee Energy	AMERESCO Chicopee Energy LLC	Chicopee, MA	4 GWh	Jan 2004	Dec 2025	Landfill Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	3 TWh	Jan 2004	May 2026	Natural Gas
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	132 GWh	Mar 2005	May 2026	Natural Gas
Coventry Clean Energy Corporation	Washington Electric Coop - (VT)	Coventry, VT	57 GWh	Jun 2005	Dec 2025	Landfill Gas
Ridgewood Providence Power	Rhode Island LFG Genco	Johnston, RI	4 GWh	Jul 2005	Dec 2025	Landfill Gas
Greater New Bedford LFG Utiliz. Facility	CommonWealth New Bedford Energy LLC	New Bedford, MA	13 GWh	Sep 2005	Dec 2025	Landfill Gas
UCONN Cogen Facility	University of Connecticut	Storrs, CT	112 GWh	Feb 2006	May 2026	Natural Gas : 95.2% Distillate Fuel Oil : 4.8%
UNH 7.9 MW Plant	Emcor Energy Services	Durham, NH	53 GWh	Aug 2006	May 2026	Landfill Gas : 55.5% Natural Gas : 42.0% Distillate Fuel Oil : 2.5%
Eastern Maine Medical Center	Eastern Maine Medical Center	Bangor, ME	28 GWh	Sep 2006	May 2026	Natural Gas
Amherst College Co Gen	Amherst College	Amherst, MA	8 GWh	Oct 2006	Dec 2025	Natural Gas
Jiminy Peak Wind QF	Jiminy Peak Mountain Resort, LLC	Hancock, MA	2 MWh	Jul 2007	Apr 2025	Wind
Fitchburg Gas Recovery	WM Renewable Energy LLC	Westminster, MA	32 GWh	Sep 2007	Dec 2025	Landfill Gas
Fairfield University CHP Plant	Fairfield University	Fairfield, CT	23 GWh	Sep 2007	Dec 2025	Natural Gas
Central Heating Plant	University of Massachusetts Amherst	Amherst, MA	80 GWh	Sep 2007	Dec 2025	Natural Gas : 96.3% Distillate Fuel Oil : 3.7%
Kimberly Clark-Unit 1,2,3	Kimberly-Clark Corporation	New Milford, CT	233 GWh	Mar 2008	Dec 2025	Natural Gas
New Milford Gas Recovery	WM Renewable Energy LLC	New Milford, CT	4 GWh	Apr 2008	Dec 2025	Landfill Gas
Pepperidge Farm Bloomfield	Pepperidge Farm, Inc.- Bloomfield	Bloomfield, CT	15 GWh	Jul 2008	Dec 2024	Natural Gas
Smith College Central Heating Plant	The Trustees of Smith College	Northampton, MA	6 GWh	Sep 2008	Dec 2025	Natural Gas
Beaver Ridge Wind	CPV Beaver Ridge Wind LLC	Freedom, ME	11 GWh	Oct 2008	Dec 2025	Wind

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