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
Pontook Hydro Facility	Pontook Operating LP	Dummer, NH	62 GWh	Nov 1986	Dec 2024	Water
Penacook Upper Falls Hydro	Briar-Hydro Associates	Penacook, NH	12 GWh	Nov 1986	Dec 2024	Water
Pumpkin Hill	KEI (Maine) Power Management (II) LLC	Lowell, ME	3 GWh	Feb 1987	Dec 2024	Water
Upper Barker	KEI (Maine) Power Management (III) LLC	Auburn, ME	5 GWh	Apr 1987	Dec 2024	Water
Bridgewater Power LP	Bridgewater Power Co LP	Bridgewater, NH	93 GWh	Jul 1987	Dec 2024	Wood/Wood Waste Solids : 99.5%
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%
Pejepscot Hydroelectric Project	Topsham Hydro Partners	Topsham, ME	49 GWh	Oct 1987	Dec 2024	Water
Indeck Jonesboro Energy Center	Stored Solar J&WE	Jonesboro, ME	16 MWh	Nov 1987	Jun 2025	Gaseous Propane : 66.7% Wood/Wood Waste Solids : 33.3%
Covanta Bristol Energy	Covanta Bristol Inc	Bristol, CT	108 GWh	Nov 1987	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Rolfe Canal Hydro	Briar-Hydro Associates	Penacook, NH	17 GWh	Nov 1987	Dec 2024	Water
NE Renewable Springfield, LLC	NE Renewable Springfield, LLC	Springfield, NH	33 GWh	Nov 1987	Dec 2024	Wood/Wood Waste Solids
Indeck West Enfield Energy Center	Stored Solar J&WE	West Enfield, ME	51 GWh	Nov 1987	Dec 2024	Wood/Wood Waste Solids : 99.9%
Benton Falls Associates	Essex Hydro Associates LLC	Benton, ME	4 GWh	Nov 1987	Dec 2024	Water
NE Renewable Whitefield, LLC	NE Renewable Whitefield, LLC	Whitefield, NH	54 GWh	Feb 1988	Dec 2024	Wood/Wood Waste Solids
West Enfield Hydro	Brookfield Black Bear Hydro, LLC	West Enfield, ME	77 GWh	Mar 1988	Dec 2024	Water
Regional Waste Systems	Ecomaine	Portland, ME	90 GWh	May 1988	Sep 2025	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	36 GWh	May 1988	Dec 2024	Water
SEMASS Resource Recovery	SEMASS Partnership	West Wareham, MA	569 GWh	Jun 1988	Sep 2025	Non-biogenic Municipal Solid Waste : 54.1% Biogenic Municipal Solid Waste : 44.3% Natural Gas : 1.5%
Wheelabrator Bridgeport	Wheelabrator Environmental Systems	Bridgeport, CT	473 GWh	Jun 1988	Sep 2025	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
Sheldon Springs Hydroelectric	Central Rivers Power US, LLC	Sheldon Springs, VT	68 GWh	Jun 1988	Dec 2024	Water
Huntington Falls	Green Mountain Power Corp	Weybridge, VT	23 GWh	Sep 1988	Dec 2024	Water
Mascoma Hydro	Green Mountain Power Corp	W. Lebanon, NH	2 GWh	Nov 1988	Dec 2024	Water
Moretown Generating Station	Moretown Hydroelectric LLC	Moretown, VT	3 GWh	Dec 1988	Dec 2023	Water
Hydro Kennebec Project	Hydro Kennebec LLC	Winslow, ME	27 GWh	Dec 1988	Dec 2024	Water
Derby Hydro	McCallum Enterprises I LP	Shelton, CT	24 GWh	Dec 1988	Dec 2024	Water
Worumbo Hydro Station	Eagle Creek Renewable Energy, LLC	Lisbon Falls, ME	89 GWh	Jan 1989	Dec 2024	Water
Wheelabrator Concord Facility	Wheelabrator Environmental Systems	Concord, NH	95 GWh	Mar 1989	Sep 2025	Non-biogenic Municipal Solid Waste : 55.0% Biogenic Municipal Solid Waste : 45.0%
Covanta Haverhill	Ogden Projects Inc-Haverhill	Haverhill, MA	226 GWh	Apr 1989	Sep 2025	Non-biogenic Municipal Solid Waste : 52.2% Biogenic Municipal Solid Waste : 42.7% Distillate Fuel Oil : 5.1%
Brassua Hydroelectric Project	Brassua Hydroelectric LP	Rockwood, ME	10 GWh	Aug 1989	Dec 2024	Water
ReEnergy Stratton LLC	ReEnergy Stratton LLC	Stratton, ME	203 GWh	Oct 1989	Dec 2024	Wood/Wood Waste Solids
Hillsborough Hosiery	Silverstreet Hydro	Hillsboro, NH	2 GWh	Nov 1989	Dec 2024	Water
Algonquin Windsor Locks	Ahlstrom Power Windsor Locks LLC	Windsor Locks, CT	125 GWh	Dec 1989	Sep 2025	Natural Gas : 99.9%
Charles E Monty	Brookfield White Pine Hydro LLC	Lewiston, ME	141 GWh	Dec 1989	Dec 2024	Water
Rumford Cogeneration	ND Paper, Inc.	Rumford, ME	429 GWh	Dec 1989	Sep 2025	Black Liquor : 51.5% Tire-derived Fuels : 22.6% Wood/Wood Waste Solids : 14.3% Bituminous Coal : 7.6% Residual Fuel Oil : 3.2% Sludge Waste : 0.9%
Quinebaug Lower Project	Quinebaug Associates LLC	Brooklyn, CT	6 GWh	Mar 1990	Dec 2024	Water
Pittsfield Generating LP	Pittsfield Generating Company, LP	Pittsfield, MA	123 GWh	Jun 1990	Sep 2025	Natural Gas : 98.6% Distillate Fuel Oil : 1.4%
Seabrook	NextEra Energy Seabrook LLC	Seabrook, NH	10 TWh	Jul 1990	Sep 2025	Nuclear
Ocean State Power	Ocean State Power Co	Harrisville, RI	1 TWh	Nov 1990	Dec 2024	Natural Gas : 99.9%
Dodge Falls Associates	Dodge Falls Associates LP	Bath, NH	29 GWh	Nov 1990	Dec 2024	Water
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	897 GWh	Sep 1991	Dec 2024	Natural Gas : 99.9%
Covanta Southeastern Connecticut Company	Covanta Southeastern Connecticut Company	Preston, CT	113 GWh	Nov 1991	Sep 2025	Non-biogenic Municipal Solid Waste : 54.1% Biogenic Municipal Solid Waste : 44.2% Distillate Fuel Oil : 1.7%
Pratt & Whitney	United Technologies	East Hartford, CT	82 GWh	Dec 1991	Sep 2025	Natural Gas
Turnkey Landfill Gas Recovery	WM Renewable Energy LLC	Rochester, NH	44 GWh	Jan 1992	Dec 2024	Landfill Gas
Dartmouth Power Associates LP	Morris Energy Operations Company, LLC	Dartmouth, MA	63 GWh	Feb 1992	Dec 2024	Natural Gas : 99.7%
MMWAC Resource Recovery Facility	Maine Waste to Energy	Auburn, ME	10 GWh	May 1992	Sep 2025	Non-biogenic Municipal Solid Waste : 54.0% Biogenic Municipal Solid Waste : 44.1% Natural Gas : 1.9%
ReEnergy Livermore Falls	ReEnergy Livermore Falls	Livermore Falls, ME	267 GWh	Jul 1992	Dec 2024	Wood/Wood Waste Solids
NE Renewable Fitchburg, LLC	NE Renewable Fitchburg, LLC	Westminster, MA	61 GWh	Jul 1992	Dec 2024	Wood/Wood Waste Solids : 98.1% Natural Gas : 1.9%
Ryegate Associates, LLC	Ryegate Associates, LLC	East Ryegate, VT	150 GWh	Aug 1992	Dec 2024	Wood/Wood Waste Solids
Milford Power LP	Milford Power LLC	Milford, MA	253 GWh	Feb 1993	Dec 2024	Natural Gas
Chace Mill Winooski One	City of Burlington Electric - (VT)	Winooski, VT	29 GWh	Mar 1993	Dec 2024	Water
Masspower	Masspower	Indian Orchard, MA	476 GWh	Jun 1993	Dec 2024	Natural Gas
CCSU Co-Gen-STBY Gen	Central Connecticut State University	New Britain, CT	90 MWh	Sep 1993	Dec 2024	Natural Gas
Lower Village Water Power Project	Sugar River Power LLC	Claremont, NH	4 GWh	Apr 1995	Dec 2024	Water
Mass Inst Tech Cntrl Utilities/Cogen Plt	Massachusetts Inst of Tech	Cambridge, MA	205 GWh	May 1995	Dec 2024	Natural Gas
Deer Island Treatment Plant	Massachusetts Wtr Rauth-Deer I	Winthrop, MA	33 GWh	Jul 1995	Sep 2025	Other Biomass Gas : 83.9% Distillate Fuel Oil : 10.8% Wind : 2.6% Solar : 1.9% Water : 0.9%
Manchester Street	Manchester Street, LLC.	Providence, RI	2 TWh	Aug 1995	Sep 2025	Natural Gas : 98.5% Distillate Fuel Oil : 1.5%
Wheelabrator Lisbon	Wheelabrator Environmental Systems	Lisbon, CT	101 GWh	Sep 1995	Sep 2025	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 2024	Landfill Gas
Searsburg Wind Turbine	Green Mountain Power Corp	Searsburg, VT	12 GWh	May 1997	Sep 2025	Wind
MM Taunton Energy	MM Taunton Energy LLC	Taunton, MA	6 GWh	Aug 1997	Dec 2024	Landfill Gas
Bridgeport Energy Project	Bridgeport Energy LLC	Bridgeport, CT	2 TWh	May 1998	Sep 2025	Natural Gas
Dighton Power Plant	Dighton Power, LLC	Dighton, MA	531 GWh	Apr 1999	Dec 2024	Natural Gas
Berkshire Power	Berkshire Power Co LLC	Agawam, MA	573 GWh	Aug 1999	Dec 2024	Natural Gas
Tiverton Power Plant	Tiverton Power LLC	Tiverton, RI	2 TWh	Feb 2000	Dec 2024	Natural Gas
Maine Independence Station	Casco Bay Energy Co LLC	Veazie, ME	3 TWh	Apr 2000	Dec 2024	Natural Gas
Rumford Power LLC	Rumford Power	Rumford, ME	638 GWh	Jun 2000	Dec 2024	Natural Gas
Millennium Power	Millennium Power Company, LLC	Charlton, MA	482 GWh	Mar 2001	Sep 2025	Natural Gas
Westbrook Energy Center Power Plant	Westbrook Energy Center	Westbrook, ME	3 TWh	Apr 2001	Sep 2025	Natural Gas
ANP Blackstone Energy Project	ANP Blackstone Energy Company LLC	Blackstone, MA	3 TWh	May 2001	Sep 2025	Natural Gas
Wallingford Energy	Wallingford Energy LLC	Wallingford, CT	88 GWh	Jul 2001	Dec 2024	Natural Gas
Granby LFG	Industrial Power Services Corp.	Granby, MA	3 GWh	Aug 2001	Dec 2024	Landfill Gas
Lake Road Generating Plant	Lake Road Generating Co LP	Dayville, CT	6 TWh	Feb 2002	Sep 2025	Natural Gas
Stamford Health Tully Health Center	Stamford Health Tully Health Center	Stamford, CT	5 GWh	Apr 2002	Dec 2024	Natural Gas
Rhode Island State Energy Center	RISEC Operating Services	Johnston, RI	3 TWh	Sep 2002	Sep 2025	Natural Gas
Newington Energy Center	Essential Power Operating Services, LLC	Newington, NH	2 TWh	Sep 2002	Sep 2025	Natural Gas : 95.7% Distillate Fuel Oil : 4.3%
Bradley Energy Center	Ameresco Select Inc	Windsor Locks, CT	12 GWh	Oct 2002	Dec 2024	Natural Gas
ANP Bellingham Energy Project	Bellingham Power Generation LLC	Bellingham, MA	3 TWh	Oct 2002	Sep 2025	Natural Gas
Toray Plastic America's CHP Plant	Toray Plastics America	North Kingstown, RI	147 GWh	Dec 2002	Dec 2024	Natural Gas
Williams College - Campus CHP	President & Trustees of Williams College	Williamstown, MA	1 GWh	Feb 2003	Dec 2024	Natural Gas : 84.0% Distillate Fuel Oil : 16.0%
Granite Ridge	Granite Ridge Energy LLC	Londonderry, NH	3 TWh	Feb 2003	Sep 2025	Natural Gas
Waterside Power, LLC	Waterside Power, LLC	Stamford, CT	2 GWh	May 2003	Dec 2024	Distillate Fuel Oil
Fore River Generating Station	Calpine Fore River Energy Center, LLC	North Weymouth, MA	3 TWh	Jul 2003	Sep 2025	Natural Gas : 95.1% Distillate Fuel Oil : 4.9%
Ameresco Chicopee Energy	AMERESCO Chicopee Energy LLC	Chicopee, MA	9 GWh	Jan 2004	Dec 2024	Landfill Gas
Milford Power Project	Milford Power Co LLC	Milford, CT	4 TWh	Jan 2004	Sep 2025	Natural Gas
Rand Whitney CHP Plant	Rand Whitney Containerboard L.P.	Montville, CT	135 GWh	Mar 2005	Sep 2025	Natural Gas
Coventry Clean Energy Corporation	Washington Electric Coop - (VT)	Coventry, VT	49 GWh	Jun 2005	Dec 2024	Landfill Gas
Ridgewood Providence Power	Rhode Island LFG Genco	Johnston, RI	1 GWh	Jul 2005	Dec 2024	Landfill Gas
Greater New Bedford LFG Utiliz. Facility	CommonWealth New Bedford Energy LLC	New Bedford, MA	17 GWh	Sep 2005	Dec 2024	Landfill Gas
UCONN Cogen Facility	University of Connecticut	Storrs, CT	124 GWh	Feb 2006	Sep 2025	Natural Gas : 98.9% Distillate Fuel Oil : 1.1%
Norwich WWTP	City of Norwich - (CT)	Norwich, CT	1 MWh	Apr 2006	Mar 2024	Distillate Fuel Oil
UNH 7.9 MW Plant	Emcor Energy Services	Durham, NH	55 GWh	Aug 2006	Sep 2025	Landfill Gas : 73.7% Natural Gas : 25.4% Distillate Fuel Oil : 0.9%
Eastern Maine Medical Center	Eastern Maine Medical Center	Bangor, ME	31 GWh	Sep 2006	Sep 2025	Natural Gas
Amherst College Co Gen	Amherst College	Amherst, MA	7 GWh	Oct 2006	Dec 2024	Natural Gas
Fitchburg Gas Recovery	WM Renewable Energy LLC	Westminster, MA	32 GWh	Sep 2007	Dec 2024	Landfill Gas
Fairfield University CHP Plant	Fairfield University	Fairfield, CT	26 GWh	Sep 2007	Dec 2024	Natural Gas
Central Heating Plant	University of Massachusetts Amherst	Amherst, MA	104 GWh	Sep 2007	Dec 2024	Natural Gas : 98.5% Distillate Fuel Oil : 1.5%
Kimberly Clark-Unit 1,2,3	Kimberly-Clark Corporation	New Milford, CT	219 GWh	Mar 2008	Dec 2024	Natural Gas
New Milford Gas Recovery	WM Renewable Energy LLC	New Milford, CT	5 GWh	Apr 2008	Dec 2024	Landfill Gas

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