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	May 2025
Annual Generation	103.2 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 \| 57.3% Nuclear \| 24.7% Water \| 6.2% Other Fuel \| 4.5% Wind \| 3.6% 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
Ball Mountain Hydro	Eagle Creek Renewable Energy, LLC	Jamaica, VT	2 GWh	Mar 2016	Nov 2023	Water
Rousselot Inc	Rousselot Inc	Peabody, MA	15 GWh	Apr 1947	Nov 2023	Natural Gas
Sunpin Blandford	Blandford Sun, LLC	Southwick, MA	6 GWh	May 2020	Nov 2023	Solar
Lower Middlebury	Green Mountain Power Corp	Middlebury Lower, VT	4 GWh	Jul 1917	Nov 2023	Water
Bellingham Cogeneration Facility	Northeast Energy Associates LP	Bellingham, MA	102 GWh	Aug 1991	Nov 2023	Natural Gas : 88.2% Distillate Fuel Oil : 11.8%
Branford	Connecticut Jet Power LLC	Branford, CT	68 MWh	Oct 1967	Dec 2023	Kerosene
Bulls Bridge	FirstLight Power Resources Services LLC	New Milford, CT	42 GWh	Dec 1902	Dec 2023	Water
Cos Cob	Connecticut Jet Power LLC	Greenwich, CT	1 GWh	Aug 1969	Dec 2023	Kerosene
Devon Station	Devon Power LLC	Milford, CT	123 MWh	Dec 1984	Dec 2023	Kerosene : 89.2% Natural Gas : 10.8%
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%
Scotland Dam	FirstLight Power Resources Services LLC	Windham, CT	10 GWh	Dec 1936	Dec 2023	Water
Shepaug	FirstLight Power Resources Services LLC	Southbury, CT	163 GWh	Dec 1954	Dec 2023	Water
Stevenson	FirstLight Power Resources Services LLC	Monroe, CT	111 GWh	Dec 1918	Dec 2023	Water
Taftville	FirstLight Power Resources Services LLC	Taftville, CT	5 GWh	Dec 1905	Dec 2023	Water
Tunnel	FirstLight Power Resources Services LLC	Preston, CT	12 GWh	Dec 1918	Dec 2023	Water : 98.2% Jet Fuel : 1.8%
Morrisville	Village of Morrisville - (VT)	Morrisville, VT	6 GWh	Jul 1924	Dec 2023	Water
Falls Village	FirstLight Power Resources Services LLC	Falls Village, CT	52 GWh	Dec 1913	Dec 2023	Water
Franklin Drive	Connecticut Jet Power LLC	Torrington, CT	100 MWh	Oct 1968	Dec 2023	Kerosene
Middletown	Middletown Power LLC	Middletown, CT	170 GWh	Sep 1958	Dec 2023	Natural Gas : 79.3% Residual Fuel Oil : 20.7%
Torrington Terminal	Connecticut Jet Power LLC	Torrington, CT	67 MWh	Oct 1967	Dec 2023	Kerosene
Great Falls (VT)	The Town of Lyndon Electric Department	Lyndon, VT	3 GWh	Jul 1915	Dec 2023	Water
Deerfield 2	Great River Hydro, LLC	Conway, MA	39 GWh	Jul 1913	Dec 2023	Water
Tenth Street	City of Norwich - (CT)	Norwich, CT	4 GWh	Apr 1967	Dec 2023	Water
W K Sanders	Village of Morrisville - (VT)	Hyde Park, VT	915 MWh	Jun 1983	Dec 2023	Water
East Barnet	Green Mountain Power Corp	Barnet, VT	6 GWh	Aug 1984	Dec 2023	Water
Charles E Monty	Brookfield White Pine Hydro LLC	Lewiston, ME	177 GWh	Dec 1989	Dec 2023	Water
Ellsworth Hydro Station	Brookfield Black Bear Hydro, LLC	Ellsworth, ME	35 GWh	Jun 1924	Dec 2023	Water
Milford Hydro Station	Brookfield Black Bear Hydro, LLC	Milford, ME	53 GWh	Jun 1941	Dec 2023	Water
Stillwater Hydro Station	Brookfield Black Bear Hydro, LLC	Stillwater, ME	12 GWh	Dec 1912	Dec 2023	Water
Bonny Eagle	Brookfield White Pine Hydro LLC	Hollis, ME	45 GWh	Dec 1909	Dec 2023	Water
Brunswick Hydro	Brookfield White Pine Hydro LLC	Brunswick, ME	123 GWh	Feb 1982	Dec 2023	Water
Cape Gas Turbine	FPL Energy Cape LLC	Portland, ME	532 MWh	Dec 1969	Dec 2023	Distillate Fuel Oil
Cataract Hydro	Brookfield White Pine Hydro LLC	Saco, ME	2 GWh	Dec 1936	Dec 2023	Water
Deer Rips	Brookfield White Pine Hydro LLC	Auburn, ME	69 GWh	Dec 1902	Dec 2023	Water
Gulf Island	Brookfield White Pine Hydro LLC	Lewiston, ME	169 GWh	Dec 1925	Dec 2023	Water
Harris Hydro	Brookfield White Pine Hydro LLC	West Forks, ME	278 GWh	Dec 1953	Dec 2023	Water
Hiram	Brookfield White Pine Hydro LLC	Hiram, ME	54 GWh	Dec 1916	Dec 2023	Water
Messalonskee 2 (Oakland)	Messalonskee Stream Hydro LLC	Oakland, ME	13 GWh	Dec 1923	Dec 2023	Water
Messalonskee 3	Messalonskee Stream Hydro LLC	Oakland, ME	7 GWh	Dec 1917	Dec 2023	Water
Messalonskee 5	Messalonskee Stream Hydro LLC	Waterville, ME	5 GWh	Dec 1934	Dec 2023	Water
North Gorham	Brookfield White Pine Hydro LLC	Gorham, ME	9 GWh	Dec 1924	Dec 2023	Water
Shawmut	Brookfield White Pine Hydro LLC	Shawmut, ME	37 GWh	Dec 1912	Dec 2023	Water
Skelton	Brookfield White Pine Hydro LLC	Dayton, ME	137 GWh	Dec 1947	Dec 2023	Water
Dwight	Central Rivers Power MA, LLC	Chicopee, MA	10 GWh	Dec 1919	Dec 2023	Water
West Buxton	Brookfield White Pine Hydro LLC	Buxton, ME	36 GWh	Dec 1903	Dec 2023	Water
Weston Hydro	Brookfield White Pine Hydro LLC	Skowhegan, ME	88 GWh	Dec 1919	Dec 2023	Water
Williams Hydro	Brookfield White Pine Hydro LLC	Solon, ME	97 GWh	Dec 1938	Dec 2023	Water
Wyman Hydro	Brookfield White Pine Hydro LLC	Bingham, ME	502 GWh	Dec 1929	Dec 2023	Water
Exelon Framingham LLC	Constellation Power, Inc	Framingham, MA	792 MWh	Aug 1969	Dec 2023	Distillate Fuel Oil
Exelon Medway LLC	Constellation Power, Inc	Medway, MA	4 GWh	Jun 1970	Dec 2023	Distillate Fuel Oil
Deerfield 4	Great River Hydro, LLC	Buckland, MA	29 GWh	Jul 1912	Dec 2023	Water
Oak Bluffs Diesel Generating Facility	Vineyard Reliability LLC	Oak Bluffs, MA	1 GWh	Dec 1968	Dec 2023	Distillate Fuel Oil
West Charleston	Barton Village, Inc	West Charleston, VT	6 GWh	Jun 1931	Dec 2023	Water
Boatlock	City of Holyoke Gas and Electric Dept.	Holyoke, MA	21 GWh	Dec 1920	Dec 2023	Water
Chemical	City of Holyoke Gas and Electric Dept.	Holyoke, MA	7 GWh	Dec 1934	Dec 2023	Water
Hadley Falls	City of Holyoke Gas and Electric Dept.	Holyoke, MA	218 GWh	Dec 1951	Dec 2023	Water
Riverside Holyoke	City of Holyoke Gas and Electric Dept.	Holyoke, MA	40 GWh	Dec 1905	Dec 2023	Water
Deerfield 5	Great River Hydro, LLC	Florida, MA	63 GWh	Sep 1974	Dec 2023	Water
Cabot	FirstLight Power Resources, Inc. - MA	Montague, MA	394 GWh	Dec 1914	Dec 2023	Water
Cobble Mountain	City of Holyoke Gas and Electric Dept.	Granville, MA	11 GWh	Dec 1929	Dec 2023	Water
Gardners Falls	Central Rivers Power MA, LLC	Buckland, MA	18 GWh	Dec 1913	Dec 2023	Water
Putts Bridge	Central Rivers Power MA, LLC	Ludlow, MA	22 GWh	Dec 1917	Dec 2023	Water
Potter Station 2	Town of Braintree - (MA)	Braintree, MA	32 GWh	Jun 1963	Dec 2023	Natural Gas : 88.2% Distillate Fuel Oil : 11.8%
High Street Station	Town of Ipswich - (MA)	Ipswich, MA	28 MWh	May 1937	Dec 2023	Natural Gas : 75.8% Distillate Fuel Oil : 24.2%
Waters River	City of Peabody - (MA)	Peabody, MA	4 GWh	Nov 1971	Dec 2023	Natural Gas : 76.6% Distillate Fuel Oil : 23.4%
Cleary Flood Hybrid	City of Taunton	Taunton, MA	50 GWh	May 1966	Dec 2023	Natural Gas : 95.5% Distillate Fuel Oil : 4.5%
Comerford	Great River Hydro, LLC	Monroe, NH	405 GWh	Aug 1930	Dec 2023	Water
S C Moore	Great River Hydro, LLC	Littleton, NH	328 GWh	Dec 1956	Dec 2023	Water
Oakland	Nautilus Solar Solutions	Oakland, ME	8 GWh	Aug 2022	Dec 2023	Solar
Wilder	Great River Hydro, LLC	Hartford, VT	192 GWh	Oct 1950	Dec 2023	Water
Amoskeag	Central Rivers Power NH, LLC	Manchester, NH	114 GWh	Jul 1922	Dec 2023	Water
Ayers Island	Central Rivers Power NH, LLC	Bristol, NH	54 GWh	Jul 1925	Dec 2023	Water
Eastman Falls	Central Rivers Power NH, LLC	Franklin, NH	33 GWh	Jul 1937	Dec 2023	Water
Gorham	Central Rivers Power NH, LLC	Gorham, NH	12 GWh	Jul 1917	Dec 2023	Water
Hooksett	Central Rivers Power NH, LLC	Hooksett, NH	3 GWh	Jul 1927	Dec 2023	Water
Jackman	Central Rivers Power NH, LLC	Hillsborough, NH	13 GWh	Jan 1926	Dec 2023	Water
Lost Nation	Granite Shore Power	Groveton, NH	428 MWh	Aug 1969	Dec 2023	Distillate Fuel Oil
West Tisbury Generating Facility	Vineyard Reliability LLC	West Tisbury, MA	2 GWh	Dec 1974	Dec 2023	Distillate Fuel Oil
Sherman	Great River Hydro, LLC	Rowe, MA	35 GWh	Nov 1926	Dec 2023	Water
Smith (NH)	Central Rivers Power NH, LLC	Berlin, NH	123 GWh	Jul 1948	Dec 2023	Water
White Lake	Granite Shore Power	Tamworth, NH	552 MWh	Jun 1968	Dec 2023	Jet Fuel
Canaan	Central Rivers Power NH, LLC	Canaan, VT	7 GWh	Jul 1927	Dec 2023	Water
Indian Orchard	Central Rivers Power MA, LLC	Indian Orchard, MA	11 GWh	Dec 1927	Dec 2023	Water
Smith (VT)	Green Mountain Power Corp	Bradford, VT	4 GWh	Nov 1982	Dec 2023	Water
Clark Falls	Green Mountain Power Corp	Milton, VT	20 GWh	Jan 1937	Dec 2023	Water
Fairfax Falls	Green Mountain Power Corp	Fairfax, VT	23 GWh	Jan 1919	Dec 2023	Water
Glen	Green Mountain Power Corp	Rutland, VT	8 GWh	Jul 1920	Dec 2023	Water
Milton	Green Mountain Power Corp	Milton, VT	48 GWh	Jan 1929	Dec 2023	Water
Peterson	Green Mountain Power Corp	Milton, VT	36 GWh	Jan 1948	Dec 2023	Water
Pittsford	Green Mountain Power Corp	Pittsford, VT	10 GWh	Jan 1914	Dec 2023	Water
Salisbury	Green Mountain Power Corp	Salisbury, VT	4 GWh	Jan 1917	Dec 2023	Water
Silver Lake (VT)	Green Mountain Power Corp	Salisbury, VT	7 GWh	Jan 1917	Dec 2023	Water
Weybridge	Green Mountain Power Corp	Weybridge, VT	16 GWh	Jan 1951	Dec 2023	Water
Newport	Great Bay Hydro Corp	Newport, VT	20 GWh	Dec 1935	Dec 2023	Water
Deerfield 3	Great River Hydro, LLC	Buckland, MA	34 GWh	Jul 1912	Dec 2023	Water
Colchester 16	Green Mountain Power Corp	Colchester, VT	4 MWh	Sep 1965	Dec 2023	Distillate Fuel Oil
Harriman	Great River Hydro, LLC	Whitingham, VT	126 GWh	Apr 1924	Dec 2023	Water
Marshfield 6	Green Mountain Power Corp	Marshfield, VT	9 GWh	Dec 1926	Dec 2023	Water
Middlesex 2	Green Mountain Power Corp	Moretown, VT	14 GWh	Dec 1927	Dec 2023	Water
West Danville 15	Green Mountain Power Corp	Danville, VT	4 GWh	Dec 1916	Dec 2023	Water

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	727.7 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	65.1 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	858.5 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	190.1 TWh	1,943
#8	Tennessee Valley Authority	158.8 TWh	170
#10	Florida Power & Light Co.	148.3 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	103.2 TWh	1,487
#16	Bonneville Power Administration	82.2 TWh	158
#17	Duke Energy Progress East	65.1 TWh	554
#18	Salt River Project Agricultural Improvement and Power District	58.7 TWh	45
#19	PacifiCorp East	57.2 TWh	204