Power plants in Maine

Maine has 274 power plants of 1 MW or more in the 2025 EIA-860 data, with 6,164 MW of nameplate capacity, the 44th-largest total among the 50 states and DC. Natural gas accounts for 26% of that capacity. The biggest single site is William F Wyman Hybrid at 863 MW. Units that came online from 2020 to 2025 add 1,454 MW, led by solar at 65%. Units retired since 2016 at plants still operating total 116 MW, most of it natural gas.

Natural gas1,579 MW26%
Wind1,217 MW20%
Solar960 MW16%
Oil and petroleum883 MW14%
Hydroelectric705 MW11%
Biomass and waste559 MW9.1%
Battery storage239 MW3.9%
Other sources22 MW0.4%

What is running, by the decade it came online

Natural gasOil and petroleumHydroelectricWindSolarBattery storageBiomass and wasteOther sources

Columns above the line show capacity still operating in 2025, stacked by fuel. Below the line: capacity retired in each decade at plants that still operate.

The 25 largest plants

Rank	Plant	Runs on	Capacity	First unit	Operator
1	William F Wyman Hybrid	Oil and petroleum	863 MW	1957	FPL Energy Wyman LLC
2	Westbrook Energy Center Power Plant	Natural gas	564 MW	2001	Westbrook Energy Center
3	Maine Independence Station	Natural gas	550 MW	2000	Casco Bay Energy Co LLC
4	Rumford Power LLC	Natural gas	274 MW	2000	Rumford Power
5	Bucksport Generation LLC	Natural gas	187 MW	2001	Bucksport Generation LLC
6	Bingham Wind	Wind	186 MW	2016	Onward Energy
7	Cross Town Energy Storage	Battery storage	175 MW	2025	Cross Town Energy Storage LLC
8	Great Lakes Hydro America - ME	Hydroelectric	158 MW	1917	Great Lakes Hydro America LLC
9	Oakfield Wind Project	Wind	148 MW	2015	Onward Energy
10	Kibby Wind Facility	Wind	132 MW	2009	Helix Maine Wind Development, LLC
11	Downeast Wind	Wind	126 MW	2025	Downeast Wind, LLC
12	Three Corners Solar	Solar	110 MW	2024	Three Corners Solar, LLC
13	Somerset Plant	Biomass and waste	107 MW	1976	Sappi Fine Paper North America-Somerset
14	Rumford Cogeneration	Biomass and waste	103 MW	1990	ND Paper, Inc.
15	Farmington Solar	Solar	77 MW	2021	Farmington Solar, LLC
16	Harris Hydro	Hydroelectric	76.4 MW	1954	Brookfield White Pine Hydro LLC
17	Weaver Wind	Wind	72.6 MW	2020	Greenbacker Renewable Energy Corporation
18	Wyman Hydro	Hydroelectric	72 MW	1930	Brookfield White Pine Hydro LLC
19	S D Warren Westbrook	Biomass and waste	69.7 MW	1903	Relevate Power Management LLC
20	Woodland Pulp, LLC	Biomass and waste	68.3 MW	1906	Woodland Pulp LLC
21	Rollins Wind Project	Wind	60 MW	2011	Evergreen Wind, LLC
22	Moscow	Wind	58.8 MW	2025	Greenbacker Renewable Energy Corporation
23	Stetson Wind I	Wind	57 MW	2009	Evergreen Wind, LLC
24	Rumford Falls Hydro Facility	Hydroelectric	52.5 MW	1918	Brookfield Power New England
25	Hancock Wind Plant	Wind	51 MW	2016	Onward Energy

All 274 plants in the finder

Largest plant for each main fuel

Main fuel	Plants	Capacity	Largest plant	Its capacity
Natural gas	5	1,579 MW	Westbrook Energy Center Power Plant	564 MW
Wind	22	1,217 MW	Bingham Wind	186 MW
Solar	175	960 MW	Three Corners Solar	110 MW
Oil and petroleum	3	901 MW	William F Wyman Hybrid	863 MW
Hydroelectric	48	700 MW	Great Lakes Hydro America - ME	158 MW
Biomass and waste	15	583 MW	Somerset Plant	107 MW
Battery storage	5	202 MW	Cross Town Energy Storage	175 MW
Other sources	1	22 MW	Twin Rivers Paper Co LLC	22 MW

Balancing areas

Area	Plants	Capacity
ISO New England	264	6,006 MW
New Brunswick System Operator	9	156 MW

Biggest operators here

Operator	Plants	Capacity
FPL Energy Wyman LLC	1	863 MW
Westbrook Energy Center	1	564 MW
Casco Bay Energy Co LLC	1	550 MW
Onward Energy	3	385 MW
Brookfield White Pine Hydro LLC	16	322 MW
Rumford Power	1	274 MW
Evergreen Wind, LLC	5	219 MW
Bucksport Generation LLC	1	187 MW
Cross Town Energy Storage LLC	1	175 MW
Great Lakes Hydro America LLC	1	158 MW