Power Plants in Maine

Maine's power-generation fleet holds 6,164 megawatts of nameplate capacity as of May 2026, ranking 44th among the 51 states and territories. This is what the equipment could produce running flat out, not what it actually generated. The state operates 272 of its 274 plants, with a fleet that has grown to include many installations but remains mid-sized by total capacity.

Natural gas accounts for 25.6% of the state's capacity across 5 plants, while a category labeled Other holds 24.4% in 19 plants. Wind contributes 19.7% through 22 installations, and solar represents 15.6% of capacity spread across 175 plants—the largest number of any fuel type. Hydro provides 11.4% from 48 plants, and battery storage adds 3.3% in 5 facilities. The state's largest generator is William F Wyman Hybrid at 863 megawatts, fueled by Other resources. Three natural gas plants follow: Westbrook Energy Center Power Plant with 564 megawatts, Maine Independence Station with 550 megawatts, and Rumford Power LLC with 275 megawatts.

The fleet's oldest plant still listed, West Buxton, came online in January 1927. The newest addition, Gulf Island, entered service in January 2026. Between these bookends lies nearly a century of generation infrastructure, with significant capacity added since 2000 when Maine Independence Station and Rumford Power LLC began operations.