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Power Plants in New Hampshire

All 61 operable plants · EIA inventory, August 2026.

Total capacity

4.6 GW

45th largest of the 50 states and DC

Plants

61 in service

Largest plant

1,242 MW

Seabrook

Capacity by fuel

31%

27%

15%

New Hampshire generating capacity by fuel
Fuel	Capacity	Share	Plants
Natural gas	1,401 MW	30.6%	3
Nuclear	1,242 MW	27.1%	1
Other	695 MW	15.2%	17
Hydro	530 MW	11.6%	32
Coal	496 MW	10.8%	1
Wind	214 MW	4.7%	5
Solar	4.4 MW	0.1%	2

Nameplate capacity — what the fleet could produce running flat out — not what it actually generated. A plant is filed under the fuel carrying most of its capacity. See what New Hampshire actually generated →

Largest plants in New Hampshire

#	Plant	Fuel	Capacity	Online
1	SeabrookRockingham County	Nuclear	1,242 MW	1990
2	Granite RidgeRockingham County	Natural gas	790 MW	2003
3	Newington Energy CenterRockingham County	Natural gas	606 MW	2002
4	MerrimackMerrimack County	Coal	496 MW	1960
5	NewingtonRockingham County	Other	414 MW	1974
6	S C MooreGrafton County	Hydro	195 MW	1957
7	ComerfordGrafton County	Hydro	168 MW	1930
8	Granite Reliable PowerCoos County	Wind	99 MW	2012
9	Burgess BioPowerCoos County	Other	75 MW	2013
10	Groton Wind LLCGrafton County	Wind	48 MW	2012

New Hampshire's generating fleet in context

New Hampshire's generating fleet holds 4.6 GW of nameplate capacity across 61 plants, ranking 45th of the 50 states and DC. Natural gas and nuclear together account for more than half the state's capacity at 30.6% and 27.1% respectively, followed by other fuels at 15.2%, hydro at 11.6%, and coal at 10.8%. Wind and solar together make up less than 5% of the total.

The largest plant is Seabrook, a nuclear facility in Rockingham County with 1,242 MW of capacity that came online in 1990. Natural gas plants Granite Ridge and Newington Energy Center, both also in Rockingham County, add 790 MW and 606 MW respectively. The Merrimack coal plant in Merrimack County contributes 496 MW, and Newington, a facility using other fuels, adds 414 MW.

The state's fleet spans more than a century in age, with Berlin Gorham dating to January 1914 and the newest addition, Blackwater Rd Solar, coming online in December 2025.

Written from the EIA figures on this page, covering data through August 2026.

Every plant in New Hampshire, by fuel

Natural gas3 plants · 1,401 MW

All US natural gas plants →

Natural gas power plants in New Hampshire, largest first
Plant	County	Capacity	Units	Online
Granite Ridge	Rockingham	790 MW	3	2003
Newington Energy Center	Rockingham	606 MW	3	2002
Hampton Facility	Rockingham	5.0 MW	1	2000

Nuclear1 plant · 1,242 MW

All US nuclear plants →

Nuclear power plants in New Hampshire, largest first
Plant	County	Capacity	Units	Online
Seabrook	Rockingham	1,242 MW	1	1990

Other17 plants · 695 MW

All US other plants →

Other power plants in New Hampshire, largest first
Plant	County	Capacity	Units	Online
Newington	Rockingham	414 MW	1	1974
Burgess BioPower	Coos	75 MW	1	2013
NE Renewable Tamworth, LLC	Carroll	25 MW	1	1987
Schiller	Rockingham	21 MW	1	1970
Bridgewater Power LP	Grafton	20 MW	1	1987
NE Renewable Springfield, LLC	Sullivan	20 MW	1	1987
NE Renewable Whitefield, LLC	Coos	20 MW	1	1988
White Lake	Carroll	19 MW	1	1968
Lost Nation	Coos	18 MW	1	1969
NE Renewable Bethlehem, LLC	GRAFTON	18 MW	1	1986
Wheelabrator Concord Facility	Merrimack	14 MW	1	1989
Turnkey Landfill Gas Recovery	Strafford	9.2 MW	6	1992
UNH 7.9 MW Plant	Strafford	7.9 MW	1	2006
Dartmouth College Heating Plant	Grafton	7.0 MW	3	1970
Plymouth State College Cogeneration	Grafton	2.8 MW	2	1994
Nashua Plant	Hillsborough	2.4 MW	2	1996
Seven Hills New Hampshire	Hillsborough	2.1 MW	3	1990

Hydro32 plants · 530 MW

All US hydro plants →

Hydro power plants in New Hampshire, largest first
Plant	County	Capacity	Units	Online
S C Moore	Grafton	195 MW	5	1957
Comerford	Grafton	168 MW	4	1930
Berlin Gorham	Coos	44 MW	22	1914
Amoskeag	Hillsborough	16 MW	3	1922
Smith (NH)	Coos	15 MW	1	1948
Garvins Falls	Merrimack	12 MW	4	1925
Pontook Hydro Facility	Coos	11 MW	3	1986
Ayers Island	Grafton	8.4 MW	3	1925
Eastman Falls	Merrimack	6.4 MW	2	1937
Dodge Falls Associates	Grafton	5.0 MW	1	1990
Penacook Lower Falls	Merrimack	4.6 MW	1	1983
Rolfe Canal Hydro	Merrimack	4.3 MW	1	1987
Gregg Falls	Hillsborough	3.5 MW	2	1985
Penacook Upper Falls Hydro	Merrimack	3.4 MW	1	1986
Jackman	Hillsborough	3.2 MW	1	1926
Errol Hydroelectric Project	Coos	3.0 MW	1	1986
Mine Falls Generating Station	Hillsborough	3.0 MW	2	1985
Pembroke Hydro	Merrimack	2.7 MW	1	1985
Clement Dam Hydro LLC	Belknap	2.4 MW	1	1984
Gorham	Coos	2.2 MW	4	1917
Stevens Mills Dam	Merrimack	1.9 MW	2	1985
China Mill Hydro	Merrimack	1.7 MW	1	1981
Hooksett	Merrimack	1.6 MW	1	1927
Mascoma Hydro	Grafton	1.5 MW	3	1988
Milton Hydro	Strafford	1.4 MW	4	1914
Newfound Hydroelectric	Grafton	1.4 MW	2	1983
Rollinsford	Strafford	1.4 MW	2	1986
Somersworth Lower Great Dam	Strafford	1.3 MW	1	1985
Hillsborough Hosiery	Hillsborough	1.2 MW	2	1989
Lochmere Hydroelectric Plant	Belknap	1.2 MW	4	1984
Lower Village Water Power Project	Sullivan	1.2 MW	2	1995
EHC West Hopkinton	Merrimack	1.0 MW	1	1985

Coal1 plant · 496 MW

All US coal plants →

Coal power plants in New Hampshire, largest first
Plant	County	Capacity	Units	Online
Merrimack	Merrimack	496 MW	4	1960

Wind5 plants · 214 MW

All US wind plants →

Wind power plants in New Hampshire, largest first
Plant	County	Capacity	Units	Online
Granite Reliable Power	Coos	99 MW	1	2012
Groton Wind LLC	Grafton	48 MW	1	2012
Antrim Wind	Hillsborough	29 MW	1	2019
Lempster Wind LLC	Sullivan	24 MW	1	2008
Jericho Power	Coos	14 MW	1	2016

Solar2 plants · 4.4 MW

All US solar plants →

Solar power plants in New Hampshire, largest first
Plant	County	Capacity	Units	Online
Merrimack Solar Farm, LLC	Hillsborough	2.4 MW	1	2019
Blackwater Rd Solar	Strafford	2.0 MW	1	2025

Sorted by nameplate capacity within each fuel. “Online” is the year the plant’s earliest surviving unit entered service.

Frequently asked questions

›How many power plants are there in New Hampshire?

New Hampshire has 61 operable power plants with a combined nameplate capacity of 4.6 GW, the 45th largest generating fleet of the 50 states and DC. 61 of them are currently in service.

›What is the largest power plant in New Hampshire?

Seabrook in Rockingham County, a nuclear plant with 1,242 MW of capacity across 1 generating unit, first online in August 1990.

›What fuel do New Hampshire's power plants use?

Natural gas accounts for the largest share of New Hampshire's generating capacity — 1,401 MW, or 30.6% of the total, across 3 plants. Nuclear follows at 27.1%, Other follows at 15.2%, Hydro follows at 11.6%. Note this is capacity, not generation — what the fleet could produce, not what it did.

›What is the oldest power plant in New Hampshire?

Berlin Gorham is the oldest still operable, with its earliest unit entering service in January 1914. The most recent addition is Blackwater Rd Solar, online since December 2025.