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
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	4 TWh	Apr 2001	May 2026	Natural Gas
Millennium Power	Millennium Power Company, LLC	Charlton, MA	995 GWh	Mar 2001	May 2026	Natural Gas
Rumford Power LLC	Rumford Power	Rumford, ME	793 GWh	Jun 2000	Dec 2025	Natural Gas
Maine Independence Station	Casco Bay Energy Co LLC	Veazie, ME	1 TWh	Apr 2000	Dec 2025	Natural Gas
Tiverton Power Plant	Tiverton Power LLC	Tiverton, RI	2 TWh	Feb 2000	Dec 2025	Natural Gas
Berkshire Power	Berkshire Power Co LLC	Agawam, MA	810 GWh	Aug 1999	Dec 2025	Natural Gas
Dighton Power Plant	Dighton Power, LLC	Dighton, MA	276 GWh	Apr 1999	Dec 2025	Natural Gas
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	3 TWh	May 1998	May 2026	Natural Gas
MM Taunton Energy	MM Taunton Energy LLC	Taunton, MA	7 GWh	Aug 1997	Dec 2025	Landfill Gas
Searsburg Wind Turbine	Green Mountain Power Corp	Searsburg, VT	10 GWh	May 1997	May 2026	Wind
Nashua Plant	NextEra Renewable Fuels, LLC	Nashua, NH	13 GWh	Mar 1996	Dec 2025	Landfill Gas
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%
Manchester Street	Manchester Street, LLC.	Providence, RI	2 TWh	Aug 1995	May 2026	Natural Gas : 92.2% Distillate Fuel Oil : 7.8%
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%
Mass Inst Tech Cntrl Utilities/Cogen Plt	Massachusetts Inst of Tech	Cambridge, MA	209 GWh	May 1995	Dec 2025	Natural Gas
Lower Village Water Power Project	Sugar River Power LLC	Claremont, NH	3 GWh	Apr 1995	Dec 2025	Water
CCSU Co-Gen-STBY Gen	Central Connecticut State University	New Britain, CT	10 MWh	Sep 1993	Dec 2025	Natural Gas
Masspower	Masspower	Indian Orchard, MA	442 GWh	Jun 1993	Dec 2025	Natural Gas
Chace Mill Winooski One	City of Burlington Electric - (VT)	Winooski, VT	17 GWh	Mar 1993	Dec 2025	Water
Milford Power LP	Milford Power LLC	Milford, MA	253 GWh	Feb 1993	Dec 2025	Natural Gas
Ryegate Associates, LLC	Ryegate Associates, LLC	East Ryegate, VT	158 GWh	Aug 1992	Dec 2025	Wood/Wood Waste Solids
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%
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%
Dartmouth Power Associates LP	Dartmouth Energy Center	Dartmouth, MA	89 GWh	Feb 1992	Dec 2025	Natural Gas : 96.7% Distillate Fuel Oil : 3.3%
Turnkey Landfill Gas Recovery	WM Renewable Energy LLC	Rochester, NH	39 GWh	Jan 1992	Dec 2025	Landfill Gas
Pratt & Whitney	United Technologies	East Hartford, CT	76 GWh	Dec 1991	May 2026	Natural Gas
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%
Ocean State Power II	Ocean State Power II	Harrisville, RI	577 GWh	Sep 1991	Dec 2025	Natural Gas : 99.9%
Bellingham Cogeneration Facility	Northeast Energy Associates LP	Bellingham, MA	368 GWh	Aug 1991	Dec 2024	Natural Gas : 99.9%
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%
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	May 2026	Nuclear
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	136 GWh	Jun 1990	May 2026	Natural Gas : 96.9% Distillate Fuel Oil : 3.1%
Quinebaug Lower Project	Quinebaug Associates LLC	Brooklyn, CT	5 GWh	Mar 1990	Dec 2025	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%
Hillsborough Hosiery	Silverstreet Hydro	Hillsboro, NH	2 GWh	Nov 1989	Dec 2024	Water
ReEnergy Stratton LLC	ReEnergy Stratton LLC	Stratton, ME	200 GWh	Oct 1989	Dec 2025	Wood/Wood Waste Solids
Brassua Hydroelectric Project	Brassua Hydroelectric LP	Rockwood, ME	13 GWh	Aug 1989	Aug 2025	Water
Deweys Mill	Green Mountain Power Corp	White River Jct., VT	2 GWh	May 1989	Dec 2025	Water
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%
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%
Worumbo Hydro Station	Eagle Creek Renewable Energy, LLC	Lisbon Falls, ME	74 GWh	Jan 1989	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
Mascoma Hydro	Green Mountain Power Corp	W. Lebanon, NH	202 MWh	Nov 1988	Dec 2025	Water
Huntington Falls	Green Mountain Power Corp	Weybridge, VT	12 GWh	Sep 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
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
West Enfield Hydro	Brookfield Black Bear Hydro, LLC	West Enfield, ME	70 GWh	Mar 1988	Dec 2025	Water
NE Renewable Whitefield, LLC	NE Renewable Whitefield, LLC	Whitefield, NH	59 GWh	Feb 1988	Dec 2025	Wood/Wood Waste Solids
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
Pejepscot Hydroelectric Project	Topsham Hydro Partners	Topsham, ME	50 GWh	Oct 1987	Dec 2025	Water
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%
Bridgewater Power LP	Bridgewater Power Co LP	Bridgewater, NH	103 GWh	Jul 1987	Dec 2025	Wood/Wood Waste Solids : 99.8%
Upper Barker	KEI (Maine) Power Management (III) LLC	Auburn, ME	4 GWh	Apr 1987	Dec 2025	Water
Pumpkin Hill	KEI (Maine) Power Management (II) LLC	Lowell, ME	3 GWh	Feb 1987	Dec 2025	Water
Penacook Upper Falls Hydro	Briar-Hydro Associates	Penacook, NH	11 GWh	Nov 1986	Dec 2025	Water
Pontook Hydro Facility	Pontook Operating LP	Dummer, NH	51 GWh	Nov 1986	Dec 2025	Water
Bolton Falls	Green Mountain Power Corp	Duxbury, VT	6 GWh	Oct 1986	Dec 2025	Water
Errol Hydroelectric Project	Errol Hydroelectric Co LLC	Errol, NH	14 GWh	Oct 1986	Dec 2025	Water
Rollinsford	Green Mountain Power Corp	Rollinsford, NH	3 GWh	Sep 1986	Dec 2025	Water
Salmon Falls	Green Mountain Power Corp	South Berwick, ME	2 GWh	Jun 1986	Dec 2025	Water
Pittsfield Hydro	KEI (Maine) Power Management (II) LLC	Burnham, ME	3 GWh	Jun 1986	Dec 2025	Water
Barker Lower	KEI (Maine) Power Management (III) LLC	Auburn, ME	4 GWh	Mar 1986	Dec 2025	Water
Mechanic Falls	KEI (Maine) Power Management (IV) LLC	Mechanic Falls, ME	2 GWh	Mar 1986	Dec 2025	Water
Goodwin Hydroelectric	Metropolitan Dist of Hartford	W. Hartland, CT	8 GWh	Mar 1986	Oct 2025	Water
Mine Falls Generating Station	City of Nashua - (NH)	Nashua, NH	9 GWh	Nov 1985	Dec 2025	Water
Pembroke Hydro	Eagle Creek Renewable Energy, LLC	Suncook, NH	7 GWh	Nov 1985	Dec 2025	Water
Gregg Falls	Eagle Creek Renewable Energy, LLC	Goffstown, NH	8 GWh	Nov 1985	Dec 2025	Water
Lockwood Hydroelectric Facility	Merimil Ltd Partnership	Waterville, ME	13 GWh	Sep 1985	Dec 2025	Water
Boott Hydropower	Boott Hydro, LLC - Hybrid	Lowell, MA	61 GWh	Sep 1985	Dec 2025	Water
Wrightsville Hydro Plant	Washington Electric Coop - (VT)	Montpelier, VT	374 MWh	Aug 1985	Dec 2025	Water
Wheelabrator Saugus	Wheelabrator Environmental Systems	Saugus, MA	180 GWh	Jul 1985	May 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Gardiner	KEI (Maine) Power Management (III) LLC	Gardiner, ME	4 GWh	Jun 1985	Jun 2025	Water
Somersworth Lower Great Dam	Green Mountain Power Corp	Somersworth, NH	498 MWh	Jun 1985	Dec 2025	Water
EHC West Hopkinton	Green Mountain Power Corp	West Hopkinton, NH	1 GWh	Jun 1985	Dec 2025	Water
Wellesley College Central Utility Plant	Wellesley College	Wellesley, MA	10 GWh	May 1985	Dec 2025	Natural Gas
Indian Orchard Plant 1	Solutia Inc-Indian	Springfield, MA	7 GWh	Apr 1985	May 2026	Natural Gas
Wheelabrator North Andover	Wheelabrator Environmental Systems	North Andover, MA	240 GWh	Apr 1985	May 2026	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Otis Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	38 GWh	Dec 1984	May 2026	Water
Clement Dam Hydro LLC	Eagle Creek Renewable Energy, LLC	Tilton, NH	7 GWh	Nov 1984	Oct 2025	Water
Lochmere Hydroelectric Plant	Eagle Creek Renewable Energy, LLC	Tilton, NH	2 GWh	Nov 1984	Oct 2025	Water
East Barnet	Green Mountain Power Corp	Barnet, VT	5 GWh	Aug 1984	Dec 2025	Water
Boltonville Hydro Associates	Boltonville Hydro Associates	Boltonville, VT	2 GWh	Jun 1984	Dec 2025	Water
J C McNeil	City of Burlington Electric - (VT)	Burlington, VT	224 GWh	May 1984	Apr 2026	Wood/Wood Waste Solids : 99.8%
Newfound Hydroelectric	Eagle Creek Renewable Energy, LLC	Bristol, NH	4 GWh	Nov 1983	Dec 2025	Water
Penacook Lower Falls	Briar-Hydro Associates	Boscawen, NH	16 GWh	Jul 1983	Dec 2025	Water

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