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	Oct 2026
Annual Generation	112.2 TWh
Power Plants	1,667
Utilities	846
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% Nuclear \| 25.3% Wind \| 5.7% Water \| 4.6% Other Fuel \| 4.5% Solar \| 1.6% Coal \| 0%

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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
Stillwater Hydro Station	Brookfield Black Bear Hydro, LLC	Stillwater, ME	6 GWh	Dec 1912	Dec 2025	Water
Bonny Eagle	Brookfield White Pine Hydro LLC	Hollis, ME	31 GWh	Dec 1909	Dec 2025	Water
Brunswick Hydro	Brookfield White Pine Hydro LLC	Brunswick, ME	70 GWh	Feb 1982	Dec 2025	Water
Cape Gas Turbine	FPL Energy Cape LLC	Portland, ME	752 MWh	Dec 1969	Dec 2025	Distillate Fuel Oil
Cataract Hydro	Brookfield White Pine Hydro LLC	Saco, ME	23 GWh	Dec 1936	Dec 2025	Water
Deer Rips	Brookfield White Pine Hydro LLC	Auburn, ME	51 GWh	Dec 1902	Dec 2025	Water
Gulf Island	Brookfield White Pine Hydro LLC	Lewiston, ME	115 GWh	Dec 1925	Dec 2025	Water
Harris Hydro	Brookfield White Pine Hydro LLC	West Forks, ME	151 GWh	Dec 1953	Dec 2025	Water
Hiram	Brookfield White Pine Hydro LLC	Hiram, ME	31 GWh	Dec 1916	Dec 2025	Water
Messalonskee 2 (Oakland)	Messalonskee Stream Hydro LLC	Oakland, ME	7 GWh	Dec 1923	Dec 2025	Water
Messalonskee 3	Messalonskee Stream Hydro LLC	Oakland, ME	4 GWh	Dec 1917	Dec 2025	Water
Messalonskee 5	Messalonskee Stream Hydro LLC	Waterville, ME	4 GWh	Dec 1934	Dec 2025	Water
North Gorham	Brookfield White Pine Hydro LLC	Gorham, ME	6 GWh	Dec 1924	Dec 2025	Water
Shawmut	Brookfield White Pine Hydro LLC	Shawmut, ME	23 GWh	Dec 1912	Dec 2025	Water
Skelton	Brookfield White Pine Hydro LLC	Dayton, ME	77 GWh	Dec 1947	Dec 2025	Water
West Buxton	Brookfield White Pine Hydro LLC	Buxton, ME	21 GWh	Dec 1903	Dec 2025	Water
Weston Hydro	Brookfield White Pine Hydro LLC	Skowhegan, ME	57 GWh	Dec 1919	Dec 2025	Water
Williams Hydro	Brookfield White Pine Hydro LLC	Solon, ME	64 GWh	Dec 1938	Dec 2025	Water
Wyman Hydro	Brookfield White Pine Hydro LLC	Bingham, ME	295 GWh	Dec 1929	Dec 2025	Water
Exelon Framingham LLC	Constellation Power, Inc	Framingham, MA	1 GWh	Aug 1969	Dec 2025	Distillate Fuel Oil
Exelon Medway LLC	Constellation Power, Inc	Medway, MA	4 GWh	Jun 1970	Dec 2025	Distillate Fuel Oil
Boatlock	City of Holyoke Gas and Elec Dept - (MA)	Holyoke, MA	12 GWh	Dec 1920	Dec 2025	Water
Chemical	City of Holyoke Gas and Elec Dept - (MA)	Holyoke, MA	5 GWh	Dec 1934	Dec 2025	Water
Hadley Falls	City of Holyoke Gas and Elec Dept - (MA)	Holyoke, MA	137 GWh	Dec 1951	Dec 2025	Water
Riverside Holyoke	City of Holyoke Gas and Elec Dept - (MA)	Holyoke, MA	22 GWh	Dec 1905	Dec 2025	Water
Deerfield 5	Great River Hydro, LLC	Florida, MA	44 GWh	Sep 1974	Dec 2025	Water
Cabot	FirstLight Power Resources, Inc. - MA	Montague, MA	239 GWh	Dec 1914	Dec 2025	Water
Cobble Mountain	City of Holyoke Gas and Elec Dept - (MA)	Granville, MA	7 GWh	Dec 1929	Dec 2025	Water
Gardners Falls	Central Rivers Power MA, LLC	Buckland, MA	11 GWh	Dec 1913	Dec 2025	Water
Putts Bridge	Central Rivers Power MA, LLC	Ludlow, MA	11 GWh	Dec 1917	Dec 2025	Water
Potter Station 2	Town of Braintree - (MA)	Braintree, MA	41 GWh	Jun 1963	Dec 2025	Natural Gas : 61.2% Distillate Fuel Oil : 38.8%
High Street Station	Town of Ipswich - (MA)	Ipswich, MA	153 MWh	May 1937	Dec 2025	Natural Gas : 92.3% Distillate Fuel Oil : 7.7%
Cleary Flood Hybrid	City of Taunton - (MA)	Taunton, MA	54 GWh	May 1966	Dec 2025	Natural Gas : 94.0% Distillate Fuel Oil : 6.0%
Comerford	Great River Hydro, LLC	Monroe, NH	297 GWh	Aug 1930	Dec 2025	Water
S C Moore	Great River Hydro, LLC	Littleton, NH	255 GWh	Dec 1956	Dec 2025	Water
Vernon Dam	Great River Hydro, LLC	Vernon, VT	119 GWh	Jul 1909	Dec 2025	Water
Wilder	Great River Hydro, LLC	Hartford, VT	134 GWh	Oct 1950	Dec 2025	Water
Amoskeag	Central Rivers Power NH, LLC	Manchester, NH	65 GWh	Jul 1922	Dec 2025	Water
Ayers Island	Central Rivers Power NH, LLC	Bristol, NH	36 GWh	Jul 1925	Dec 2025	Water
Eastman Falls	Central Rivers Power NH, LLC	Franklin, NH	22 GWh	Jul 1937	Dec 2025	Water
Garvins Falls	Central Rivers Power NH, LLC	Bow, NH	25 GWh	Jul 1925	Dec 2025	Water
Gorham	Central Rivers Power NH, LLC	Gorham, NH	8 GWh	Jul 1917	Dec 2025	Water
Hooksett	Central Rivers Power NH, LLC	Hooksett, NH	6 GWh	Jul 1927	Dec 2025	Water
Lost Nation	Granite Shore Power	Groveton, NH	416 MWh	Aug 1969	Dec 2025	Distillate Fuel Oil
Smith (NH)	Central Rivers Power NH, LLC	Berlin, NH	87 GWh	Jul 1948	Dec 2025	Water
White Lake	Granite Shore Power	Tamworth, NH	594 MWh	Jun 1968	Dec 2025	Jet Fuel
Smith (VT)	Green Mountain Power Corp	Bradford, VT	2 GWh	Nov 1982	Dec 2025	Water
Cavendish	Green Mountain Power Corp	Cavendish, VT	1 GWh	Jan 1907	Dec 2025	Water
Clark Falls	Green Mountain Power Corp	Milton, VT	14 GWh	Jan 1937	Dec 2025	Water
Fairfax Falls	Green Mountain Power Corp	Fairfax, VT	16 GWh	Jan 1919	Dec 2025	Water
Glen	Green Mountain Power Corp	Rutland, VT	6 GWh	Jul 1920	Dec 2025	Water
Lower Middlebury	Green Mountain Power Corp	Middlebury Lower, VT	5 GWh	Jul 1917	Dec 2025	Water
Milton	Green Mountain Power Corp	Milton, VT	34 GWh	Jan 1929	Dec 2025	Water
Peterson	Green Mountain Power Corp	Milton, VT	25 GWh	Jan 1948	Dec 2025	Water
Pittsford	Green Mountain Power Corp	Pittsford, VT	8 GWh	Jan 1914	Dec 2025	Water
Salisbury	Green Mountain Power Corp	Salisbury, VT	2 GWh	Jan 1917	Dec 2025	Water
Silver Lake (VT)	Green Mountain Power Corp	Salisbury, VT	5 GWh	Jan 1917	Dec 2025	Water
Weybridge	Green Mountain Power Corp	Weybridge, VT	10 GWh	Jan 1951	Dec 2025	Water
Newport	Great Bay Hydro Corp	Newport, VT	13 GWh	Dec 1935	Dec 2025	Water
Colchester 16	Green Mountain Power Corp	Colchester, VT	310 MWh	Sep 1965	Dec 2025	Distillate Fuel Oil
Marshfield 6	Green Mountain Power Corp	Marshfield, VT	4 GWh	Dec 1926	Dec 2025	Water
Middlesex 2	Green Mountain Power Corp	Moretown, VT	6 GWh	Dec 1927	Dec 2025	Water
West Danville 15	Green Mountain Power Corp	Danville, VT	2 GWh	Dec 1916	Dec 2025	Water
Bellows Falls	Great River Hydro, LLC	Bellow Falls, VT	194 GWh	Feb 1928	Dec 2025	Water
Harriman	Great River Hydro, LLC	Whitingham, VT	98 GWh	Apr 1924	Dec 2025	Water
Canaan	Central Rivers Power NH, LLC	Canaan, VT	6 GWh	Jul 1927	Dec 2025	Water
Burlington GT	City of Burlington Electric - (VT)	Burlington, VT	684 MWh	Aug 1971	Dec 2025	Distillate Fuel Oil
Great Falls (VT)	The Town of Lyndon Elec Dept - (VT)	Lyndon, VT	2 GWh	Jul 1915	Dec 2025	Water
Morrisville	Village of Morrisville - (VT)	Morrisville, VT	5 GWh	Jul 1924	Dec 2025	Water
Cadys Falls	Village of Morrisville - (VT)	Morrisville, VT	2 GWh	Jul 1914	Dec 2025	Water
Sherman	Great River Hydro, LLC	Rowe, MA	28 GWh	Nov 1926	Dec 2025	Water
Deerfield 2	Great River Hydro, LLC	Conway, MA	29 GWh	Jul 1913	Dec 2025	Water
Deerfield 3	Great River Hydro, LLC	Buckland, MA	26 GWh	Jul 1912	Dec 2025	Water
Deerfield 4	Great River Hydro, LLC	Buckland, MA	21 GWh	Jul 1912	Dec 2025	Water
Shrewsbury	Town of Shrewsbury - (MA)	Shrewsbury, MA	2 GWh	Oct 1969	Dec 2025	Distillate Fuel Oil
Dwight	Central Rivers Power MA, LLC	Chicopee, MA	6 GWh	Dec 1919	Dec 2025	Water
Indian Orchard	Central Rivers Power MA, LLC	Indian Orchard, MA	3 GWh	Dec 1927	Dec 2025	Water
Turners Falls	FirstLight Power Resources, Inc. - MA	Montague, MA	12 GWh	Dec 1904	Dec 2025	Water
Proctor	Green Mountain Power Corp	Proctor, VT	28 GWh	Jul 1905	Dec 2025	Water
Beldens	Green Mountain Power Corp	New Haven, VT	6 GWh	Jul 1913	Dec 2025	Water
Carver Falls	Green Mountain Power Corp	Hampton, NY	4 GWh	Jan 1922	Dec 2025	Water
Gorge 18	Green Mountain Power Corp	South Burlington, VT	15 GWh	Dec 1927	Dec 2025	Water
Mcindoes	Great River Hydro, LLC	Barnet, VT	39 GWh	Dec 1930	Dec 2025	Water
Vergennes 9	Green Mountain Power Corp	Vergennes, VT	8 GWh	Dec 1911	Dec 2025	Water
Waterbury 22	Green Mountain Power Corp	Waterbury, VT	11 GWh	May 1953	Dec 2025	Water
Searsburg	Great River Hydro, LLC	Searsburg, VT	16 GWh	Feb 1922	Dec 2025	Water
Wilkins Station	Town of Marblehead - (MA)	Marblehead, MA	32 MWh	Oct 1975	Dec 2025	Distillate Fuel Oil
Highgate Falls	Village of Swanton - (VT)	Highgate, VT	32 GWh	Jul 1923	Dec 2025	Water
Wrightsville Hydro Plant	Washington Electric Coop - (VT)	Montpelier, VT	374 MWh	Aug 1985	Dec 2025	Water
Bolton Falls	Green Mountain Power Corp	Duxbury, VT	6 GWh	Oct 1986	Dec 2025	Water
Front Street	City of Chicopee - (MA)	Chicopee, MA	1 GWh	Dec 1977	Dec 2025	Distillate Fuel Oil
Princeton Wind Farm	Town of Princeton - (MA)	Princeton, MA	4 GWh	Dec 2009	Dec 2025	Wind
Cherry Street	Town of Hudson - (MA)	Hudson, MA	320 MWh	Apr 1951	Dec 2025	Distillate Fuel Oil : 58.5% Natural Gas : 41.5%
Cabot Holyoke	City of Holyoke Gas and Elec Dept - (MA)	Holyoke, MA	3 GWh	Dec 1892	Dec 2025	Water
Hillsborough Hosiery	Silverstreet Hydro	Hillsboro, NH	2 GWh	Nov 1989	Dec 2025	Water
Derby Hydro	McCallum Enterprises I LP	Shelton, CT	23 GWh	Dec 1988	Dec 2025	Water
Lockwood Hydroelectric Facility	Merimil Ltd Partnership	Waterville, ME	13 GWh	Sep 1985	Dec 2025	Water
Stevens Mills Dam	Eagle Creek Renewable Energy, LLC	Franklin, NH	4 GWh	May 1982	Dec 2025	Water
Deweys Mill	Green Mountain Power Corp	White River Jct., VT	2 GWh	May 1989	Dec 2025	Water
M Street Jet	Massachusetts Bay Trans Auth	Boston, MA	294 MWh	Apr 1979	Dec 2025	Kerosene

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#61	Alcoa Power Generating, Inc. - Yadkin Division	433.0 GWh	4
#24	Dominion Energy South Carolina, Inc.	26.1 TWh	83
#13	Duke Energy Carolinas	113.4 TWh	578
#17	Duke Energy Progress East	66.2 TWh	574
#50	Duke Energy Progress West	4.6 TWh	15
#23	Louisville Gas and Electric Company and Kentucky Utilities Company	34.2 TWh	25
#12	New York Independent System Operator	134.1 TWh	1,334
#1	PJM Interconnection, LLC	890.9 TWh	2,806
#28	South Carolina Public Service Authority	19.6 TWh	35
#59	Southeastern Power Administration	1.2 TWh	11

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#7	California Independent System Operator	168.7 TWh	2,170
#9	Tennessee Valley Authority	166.2 TWh	209
#10	Florida Power & Light Co.	153.0 TWh	188
#12	New York Independent System Operator	134.1 TWh	1,334
#13	Duke Energy Carolinas	113.4 TWh	578
#15	ISO New England	112.2 TWh	1,667
#16	Bonneville Power Administration	91.1 TWh	170
#17	Duke Energy Progress East	66.2 TWh	574
#18	PacifiCorp East	61.4 TWh	223
#19	Salt River Project Agricultural Improvement and Power District	60.5 TWh	51