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
Gravel Pit Solar, LLC	Gravel Pit Solar, LLC	East Windsor, CT	113 GWh	-	Sep 2025	Solar
Moscow	Greenbacker Renewable Energy Corporation	Moscow, ME	14 GWh	-	Sep 2025	Wind
Downeast Wind	Downeast Wind, LLC	Columbia, ME	145 GWh	-	Sep 2025	Wind
Cabot Holyoke	City of Holyoke Gas and Electric Dept.	Holyoke, MA	4 GWh	Dec 1892	Dec 2024	Water
Bulls Bridge	FirstLight Power Resources Services LLC	New Milford, CT	31 GWh	Dec 1902	Dec 2024	Water
S D Warren Westbrook	Relevate Power Management LLC	Westbrook, ME	33 GWh	Dec 1902	Dec 2023	Water
Deer Rips	Brookfield White Pine Hydro LLC	Auburn, ME	58 GWh	Dec 1902	Dec 2024	Water
West Buxton	Brookfield White Pine Hydro LLC	Buxton, ME	20 GWh	Dec 1903	Dec 2024	Water
Turners Falls	FirstLight Power Resources, Inc. - MA	Montague, MA	12 GWh	Dec 1904	Dec 2024	Water
Proctor	Green Mountain Power Corp	Proctor, VT	31 GWh	Jul 1905	Dec 2024	Water
Taftville	FirstLight Power Resources Services LLC	Taftville, CT	3 GWh	Dec 1905	Dec 2024	Water
Riverside Holyoke	City of Holyoke Gas and Electric Dept.	Holyoke, MA	38 GWh	Dec 1905	Dec 2024	Water
Cavendish	Green Mountain Power Corp	Cavendish, VT	830 MWh	Jan 1907	Dec 2024	Water
Vernon Dam	Great River Hydro, LLC	Vernon, VT	160 GWh	Jul 1909	Dec 2024	Water
Indian River Hydro	Eagle Creek Renewable Energy, LLC	Russell, MA	1 GWh	Nov 1909	Dec 2024	Water
Bonny Eagle	Brookfield White Pine Hydro LLC	Hollis, ME	33 GWh	Dec 1909	Dec 2024	Water
International Paper Livermore Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	17 GWh	Dec 1909	Dec 2024	Water
Vergennes 9	Green Mountain Power Corp	Vergennes, VT	8 GWh	Dec 1911	Dec 2024	Water
International Paper Jay Hydro	Eagle Creek Renewable Energy, LLC	Jay, ME	7 GWh	Dec 1911	Dec 2024	Water
Deerfield 4	Great River Hydro, LLC	Buckland, MA	20 GWh	Jul 1912	Dec 2024	Water
Deerfield 3	Great River Hydro, LLC	Buckland, MA	25 GWh	Jul 1912	Dec 2024	Water
Stillwater Hydro Station	Brookfield Black Bear Hydro, LLC	Stillwater, ME	7 GWh	Dec 1912	Dec 2024	Water
Shawmut	Brookfield White Pine Hydro LLC	Shawmut, ME	17 GWh	Dec 1912	Dec 2024	Water
International Paper Woronoco Mill	Eagle Creek Renewable Energy, LLC	Woronoco, MA	5 GWh	Dec 1912	Dec 2024	Water
Beldens	Green Mountain Power Corp	New Haven, VT	14 GWh	Jul 1913	Dec 2024	Water
Deerfield 2	Great River Hydro, LLC	Conway, MA	29 GWh	Jul 1913	Dec 2024	Water
Falls Village	FirstLight Power Resources Services LLC	Falls Village, CT	30 GWh	Dec 1913	Dec 2024	Water
Gardners Falls	Central Rivers Power MA, LLC	Buckland, MA	11 GWh	Dec 1913	Dec 2024	Water
Berlin Gorham	Great Lakes Hydro America LLC	Berlin, NH	133 GWh	Dec 1913	Dec 2024	Water
Milton Hydro	SFR Hydro Cor	Milton, NH	6 GWh	Dec 1913	Dec 2024	Water
Pittsford	Green Mountain Power Corp	Pittsford, VT	8 GWh	Jan 1914	Dec 2024	Water
Cadys Falls	Village of Morrisville - (VT)	Morrisville, VT	139 MWh	Jul 1914	Dec 2024	Water
Cabot	FirstLight Power Resources, Inc. - MA	Montague, MA	304 GWh	Dec 1914	Dec 2024	Water
Great Falls (VT)	The Town of Lyndon Electric Department	Lyndon, VT	3 GWh	Jul 1915	Dec 2024	Water
Hiram	Brookfield White Pine Hydro LLC	Hiram, ME	40 GWh	Dec 1916	Dec 2024	Water
Essex Junction 19	Green Mountain Power Corp	Essex Junction, VT	32 GWh	Dec 1916	Sep 2025	Water : 99.6%
West Danville 15	Green Mountain Power Corp	Danville, VT	3 GWh	Dec 1916	Dec 2024	Water
Salisbury	Green Mountain Power Corp	Salisbury, VT	2 GWh	Jan 1917	Dec 2024	Water
Silver Lake (VT)	Green Mountain Power Corp	Salisbury, VT	5 GWh	Jan 1917	Dec 2024	Water
Great Lakes Hydro America - ME	Great Lakes Hydro America LLC	Millinocket, ME	571 GWh	Jun 1917	Dec 2024	Water
Gorham	Central Rivers Power NH, LLC	Gorham, NH	11 GWh	Jul 1917	Dec 2024	Water
Lower Middlebury	Green Mountain Power Corp	Middlebury Lower, VT	4 GWh	Jul 1917	Dec 2024	Water
Messalonskee 3	Messalonskee Stream Hydro LLC	Oakland, ME	7 GWh	Dec 1917	Dec 2024	Water
Putts Bridge	Central Rivers Power MA, LLC	Ludlow, MA	16 GWh	Dec 1917	Dec 2024	Water
Rumford Falls Hydro Facility	Brookfield Power New England	Rumford, ME	261 GWh	Dec 1917	Dec 2024	Water
Stevenson	FirstLight Power Resources Services LLC	Monroe, CT	96 GWh	Dec 1918	Dec 2024	Water
Tunnel	FirstLight Power Resources Services LLC	Preston, CT	8 GWh	Dec 1918	Dec 2024	Water
Fairfax Falls	Green Mountain Power Corp	Fairfax, VT	20 GWh	Jan 1919	Dec 2024	Water
Weston Hydro	Brookfield White Pine Hydro LLC	Skowhegan, ME	57 GWh	Dec 1919	Dec 2024	Water
Dwight	Central Rivers Power MA, LLC	Chicopee, MA	6 GWh	Dec 1919	Dec 2024	Water
Pepperell Hydro Power Plant	Eagle Creek Renewable Energy, LLC	Pepperell, MA	4 GWh	Dec 1919	Sep 2025	Water
Glen	Green Mountain Power Corp	Rutland, VT	6 GWh	Jul 1920	Dec 2024	Water
Boatlock	City of Holyoke Gas and Electric Dept.	Holyoke, MA	19 GWh	Dec 1920	Dec 2024	Water
Carver Falls	Green Mountain Power Corp	Hampton, NY	6 GWh	Jan 1922	Dec 2024	Water
Searsburg	Great River Hydro, LLC	Searsburg, VT	15 GWh	Feb 1922	Dec 2024	Water
Amoskeag	Central Rivers Power NH, LLC	Manchester, NH	77 GWh	Jul 1922	Dec 2024	Water
Medway Hydro	Brookfield Black Bear Hydro, LLC	Medway, ME	23 GWh	Dec 1922	Dec 2024	Water
Highgate Falls	Village of Swanton - (VT)	Highgate, VT	47 GWh	Jul 1923	Dec 2024	Water
Messalonskee 2 (Oakland)	Messalonskee Stream Hydro LLC	Oakland, ME	11 GWh	Dec 1923	Dec 2024	Water
Harriman	Great River Hydro, LLC	Whitingham, VT	91 GWh	Apr 1924	Dec 2024	Water
Ellsworth Hydro Station	Brookfield Black Bear Hydro, LLC	Ellsworth, ME	22 GWh	Jun 1924	Dec 2024	Water
Morrisville	Village of Morrisville - (VT)	Morrisville, VT	5 GWh	Jul 1924	Dec 2024	Water
North Gorham	Brookfield White Pine Hydro LLC	Gorham, ME	7 GWh	Dec 1924	Dec 2024	Water
Ayers Island	Central Rivers Power NH, LLC	Bristol, NH	40 GWh	Jul 1925	Dec 2024	Water
Garvins Falls	Central Rivers Power NH, LLC	Bow, NH	31 GWh	Jul 1925	Dec 2024	Water
Rainbow (CT)	Farmington River Power Company	Windsor, CT	20 GWh	Nov 1925	Sep 2025	Water
Gulf Island	Brookfield White Pine Hydro LLC	Lewiston, ME	136 GWh	Dec 1925	Dec 2024	Water
Jackman	Central Rivers Power NH, LLC	Hillsborough, NH	9 GWh	Jan 1926	Dec 2024	Water
Sherman	Great River Hydro, LLC	Rowe, MA	27 GWh	Nov 1926	Dec 2024	Water
Marshfield 6	Green Mountain Power Corp	Marshfield, VT	8 GWh	Dec 1926	Dec 2024	Water
Hooksett	Central Rivers Power NH, LLC	Hooksett, NH	5 GWh	Jul 1927	Dec 2024	Water
Canaan	Central Rivers Power NH, LLC	Canaan, VT	6 GWh	Jul 1927	Dec 2024	Water
Indian Orchard	Central Rivers Power MA, LLC	Indian Orchard, MA	6 GWh	Dec 1927	Dec 2024	Water
Gorge 18	Green Mountain Power Corp	South Burlington, VT	17 GWh	Dec 1927	Dec 2024	Water
Middlesex 2	Green Mountain Power Corp	Moretown, VT	10 GWh	Dec 1927	Dec 2024	Water
Bellows Falls	Great River Hydro, LLC	Bellow Falls, VT	264 GWh	Feb 1928	Dec 2024	Water
Milton	Green Mountain Power Corp	Milton, VT	44 GWh	Jan 1929	Dec 2024	Water
Wyman Hydro	Brookfield White Pine Hydro LLC	Bingham, ME	337 GWh	Dec 1929	Dec 2024	Water
Cobble Mountain	City of Holyoke Gas and Electric Dept.	Granville, MA	8 GWh	Dec 1929	Dec 2024	Water
Comerford	Great River Hydro, LLC	Monroe, NH	400 GWh	Aug 1930	Dec 2024	Water
Mcindoes	Great River Hydro, LLC	Barnet, VT	53 GWh	Dec 1930	Dec 2024	Water
West Charleston	Barton Village, Inc	West Charleston, VT	7 GWh	Jun 1931	Dec 2024	Water
Messalonskee 5	Messalonskee Stream Hydro LLC	Waterville, ME	3 GWh	Dec 1934	Dec 2024	Water
Chemical	City of Holyoke Gas and Electric Dept.	Holyoke, MA	5 GWh	Dec 1934	Dec 2024	Water
Newport	Great Bay Hydro Corp	Newport, VT	21 GWh	Dec 1935	Dec 2024	Water
Scotland Dam	FirstLight Power Resources Services LLC	Windham, CT	7 GWh	Dec 1936	Dec 2024	Water
Cataract Hydro	Brookfield White Pine Hydro LLC	Saco, ME	28 GWh	Dec 1936	Dec 2024	Water
Clark Falls	Green Mountain Power Corp	Milton, VT	17 GWh	Jan 1937	Dec 2024	Water
High Street Station	Town of Ipswich - (MA)	Ipswich, MA	197 MWh	May 1937	Dec 2024	Natural Gas : 91.9% Distillate Fuel Oil : 8.1%
Eastman Falls	Central Rivers Power NH, LLC	Franklin, NH	24 GWh	Jul 1937	Dec 2024	Water
Williams Hydro	Brookfield White Pine Hydro LLC	Solon, ME	80 GWh	Dec 1938	Dec 2024	Water
Gilman Mill	Ampersand Gilman Hydro LP	Gilman, VT	4 GWh	Dec 1940	Dec 2024	Water
Milford Hydro Station	Brookfield Black Bear Hydro, LLC	Milford, ME	37 GWh	Jun 1941	Dec 2024	Water
Pfizer Groton Plant	Pfizer Inc	Groton, CT	78 GWh	Dec 1947	Sep 2025	Natural Gas : 91.4% Distillate Fuel Oil : 8.6%
Skelton	Brookfield White Pine Hydro LLC	Dayton, ME	58 GWh	Dec 1947	Dec 2024	Water
General Electric Aircraft Engines	General Electric Aircraft Engines	Lynn, MA	2 GWh	Dec 1947	Sep 2025	Solar
Peterson	Green Mountain Power Corp	Milton, VT	31 GWh	Jan 1948	Dec 2024	Water
Smith (NH)	Central Rivers Power NH, LLC	Berlin, NH	112 GWh	Jul 1948	Dec 2024	Water
Kendall Square Station	Kendall Green Energy, LLC	Cambridge, MA	2 TWh	May 1949	Sep 2025	Natural Gas : 99.1% Distillate Fuel Oil : 0.9%
Anson Abenaki Hydros	Eagle Creek Renewable Energy, LLC	Madison, ME	116 GWh	Dec 1949	Dec 2024	Water

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