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
Jackman	Central Rivers Power NH, LLC	Hillsborough, NH	8 GWh	Jan 1926	Aug 2025	Water
Gulf Island	Brookfield White Pine Hydro LLC	Lewiston, ME	115 GWh	Dec 1925	Dec 2025	Water
Rainbow (CT)	Farmington River Power Company	Windsor, CT	22 GWh	Nov 1925	May 2026	Water
Ayers Island	Central Rivers Power NH, LLC	Bristol, NH	36 GWh	Jul 1925	Dec 2025	Water
Garvins Falls	Central Rivers Power NH, LLC	Bow, NH	25 GWh	Jul 1925	Dec 2025	Water
North Gorham	Brookfield White Pine Hydro LLC	Gorham, ME	6 GWh	Dec 1924	Dec 2025	Water
Morrisville	Village of Morrisville - (VT)	Morrisville, VT	5 GWh	Jul 1924	Dec 2025	Water
Ellsworth Hydro Station	Brookfield Black Bear Hydro, LLC	Ellsworth, ME	18 GWh	Jun 1924	Dec 2025	Water
Harriman	Great River Hydro, LLC	Whitingham, VT	98 GWh	Apr 1924	Dec 2025	Water
Messalonskee 2 (Oakland)	Messalonskee Stream Hydro LLC	Oakland, ME	7 GWh	Dec 1923	Dec 2025	Water
Highgate Falls	Village of Swanton - (VT)	Highgate, VT	32 GWh	Jul 1923	Dec 2025	Water
Medway Hydro	Brookfield Black Bear Hydro, LLC	Medway, ME	23 GWh	Dec 1922	Dec 2025	Water
Amoskeag	Central Rivers Power NH, LLC	Manchester, NH	65 GWh	Jul 1922	Dec 2025	Water
Searsburg	Great River Hydro, LLC	Searsburg, VT	16 GWh	Feb 1922	Dec 2025	Water
Carver Falls	Green Mountain Power Corp	Hampton, NY	4 GWh	Jan 1922	Dec 2025	Water
Boatlock	City of Holyoke Gas and Elec Dept - (MA)	Holyoke, MA	12 GWh	Dec 1920	Dec 2025	Water
Glen	Green Mountain Power Corp	Rutland, VT	6 GWh	Jul 1920	Dec 2025	Water
Weston Hydro	Brookfield White Pine Hydro LLC	Skowhegan, ME	57 GWh	Dec 1919	Dec 2025	Water
Dwight	Central Rivers Power MA, LLC	Chicopee, MA	6 GWh	Dec 1919	Dec 2025	Water
Pepperell Hydro Power Plant	Eagle Creek Renewable Energy, LLC	Pepperell, MA	2 GWh	Dec 1919	May 2026	Water
Fairfax Falls	Green Mountain Power Corp	Fairfax, VT	16 GWh	Jan 1919	Dec 2025	Water
Stevenson	FirstLight Power Resources Services LLC	Monroe, CT	71 GWh	Dec 1918	Dec 2025	Water
Tunnel	FirstLight Power Resources Services LLC	Preston, CT	6 GWh	Dec 1918	Dec 2025	Water
Messalonskee 3	Messalonskee Stream Hydro LLC	Oakland, ME	4 GWh	Dec 1917	Dec 2025	Water
Putts Bridge	Central Rivers Power MA, LLC	Ludlow, MA	11 GWh	Dec 1917	Dec 2025	Water
Rumford Falls Hydro Facility	Brookfield Power New England	Rumford, ME	212 GWh	Dec 1917	Dec 2025	Water
Gorham	Central Rivers Power NH, LLC	Gorham, NH	8 GWh	Jul 1917	Dec 2025	Water
Lower Middlebury	Green Mountain Power Corp	Middlebury Lower, VT	5 GWh	Jul 1917	Dec 2025	Water
Great Lakes Hydro America - ME	Great Lakes Hydro America LLC	Millinocket, ME	500 GWh	Jun 1917	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
Hiram	Brookfield White Pine Hydro LLC	Hiram, ME	31 GWh	Dec 1916	Dec 2025	Water
Essex Junction 19	Green Mountain Power Corp	Essex Junction, VT	34 GWh	Dec 1916	May 2026	Water : 98.8% Distillate Fuel Oil : 1.2%
West Danville 15	Green Mountain Power Corp	Danville, VT	2 GWh	Dec 1916	Dec 2025	Water
Great Falls (VT)	The Town of Lyndon Elec Dept - (VT)	Lyndon, VT	2 GWh	Jul 1915	Dec 2025	Water
Cabot	FirstLight Power Resources, Inc. - MA	Montague, MA	239 GWh	Dec 1914	Dec 2025	Water
Cadys Falls	Village of Morrisville - (VT)	Morrisville, VT	2 GWh	Jul 1914	Dec 2025	Water
Pittsford	Green Mountain Power Corp	Pittsford, VT	8 GWh	Jan 1914	Dec 2025	Water
Falls Village	FirstLight Power Resources Services LLC	Falls Village, CT	26 GWh	Dec 1913	Dec 2025	Water
Gardners Falls	Central Rivers Power MA, LLC	Buckland, MA	11 GWh	Dec 1913	Dec 2025	Water
Milton Hydro	SFR Hydro Cor	Milton, NH	5 GWh	Dec 1913	Dec 2025	Water
Berlin Gorham	Great Lakes Hydro America LLC	Berlin, NH	101 GWh	Dec 1913	Dec 2025	Water
Deerfield 2	Great River Hydro, LLC	Conway, MA	29 GWh	Jul 1913	Dec 2025	Water
Beldens	Green Mountain Power Corp	New Haven, VT	6 GWh	Jul 1913	Dec 2025	Water
Stillwater Hydro Station	Brookfield Black Bear Hydro, LLC	Stillwater, ME	6 GWh	Dec 1912	Dec 2025	Water
Shawmut	Brookfield White Pine Hydro LLC	Shawmut, ME	23 GWh	Dec 1912	Dec 2025	Water
International Paper Woronoco Mill	Eagle Creek Renewable Energy, LLC	Woronoco, MA	7 GWh	Dec 1912	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
Vergennes 9	Green Mountain Power Corp	Vergennes, VT	8 GWh	Dec 1911	Dec 2025	Water
International Paper Jay Hydro	Eagle Creek Renewable Energy, LLC	Jay, ME	12 GWh	Dec 1911	Dec 2025	Water
Bonny Eagle	Brookfield White Pine Hydro LLC	Hollis, ME	31 GWh	Dec 1909	Dec 2025	Water
International Paper Livermore Hydro	Eagle Creek Renewable Energy, LLC	Livermore Falls, ME	24 GWh	Dec 1909	Dec 2025	Water
Indian River Hydro	Eagle Creek Renewable Energy, LLC	Russell, MA	2 GWh	Nov 1909	Dec 2025	Water
Vernon Dam	Great River Hydro, LLC	Vernon, VT	119 GWh	Jul 1909	Dec 2025	Water
Cavendish	Green Mountain Power Corp	Cavendish, VT	1 GWh	Jan 1907	Dec 2025	Water
Taftville	FirstLight Power Resources Services LLC	Taftville, CT	2 GWh	Dec 1905	Dec 2025	Water
Riverside Holyoke	City of Holyoke Gas and Elec Dept - (MA)	Holyoke, MA	22 GWh	Dec 1905	Dec 2025	Water
Proctor	Green Mountain Power Corp	Proctor, VT	28 GWh	Jul 1905	Dec 2025	Water
Turners Falls	FirstLight Power Resources, Inc. - MA	Montague, MA	12 GWh	Dec 1904	Dec 2025	Water
West Buxton	Brookfield White Pine Hydro LLC	Buxton, ME	21 GWh	Dec 1903	Dec 2025	Water
Bulls Bridge	FirstLight Power Resources Services LLC	New Milford, CT	27 GWh	Dec 1902	Dec 2025	Water
Deer Rips	Brookfield White Pine Hydro LLC	Auburn, ME	51 GWh	Dec 1902	Dec 2025	Water
S D Warren Westbrook	Relevate Power Management LLC	Westbrook, ME	15 GWh	Dec 1902	Dec 2025	Water
Cabot Holyoke	City of Holyoke Gas and Elec Dept - (MA)	Holyoke, MA	3 GWh	Dec 1892	Dec 2025	Water
Vineyard Wind 1	Vineyard Wind 1 LLC	Edgartown, MA	363 GWh	-	May 2026	Wind
Medway Grid	Medway Grid LLC	Medway, MA	20 GWh	-	May 2026	Electricity used for energy storage

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