Hydroelectric power plants in Maine
48 operating hydroelectric power plants in Maine with 669 MW of hydroelectric capacity, largest first. From EIA-860M, August 2026.
Plants
48
Hydroelectric capacity
669 MW
Net generation, 2025
2.48 TWh
Largest hydroelectric power plants in Maine
| # | Plant | Hydroelectric MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | Great Lakes Hydro America - MEPenobscot County | 128 | 500 | 41.5% |
| 2 | Harris HydroSomerset County | 76 | 151 | 22.6% |
| 3 | Wyman HydroSomerset County | 72 | 295 | 46.8% |
| 4 | Rumford Falls Hydro FacilityOxford County | 40 | 212 | 54.9% |
| 5 | Anson Abenaki HydrosSomerset County | 29 | 101 | 39.6% |
| 6 | Charles E MontyAndroscoggin County | 28 | 114 | 46.0% |
| 7 | Brunswick HydroCumberland County | 20 | 69.6 | 40.5% |
| 8 | Worumbo Hydro StationAndroscoggin County | 19 | 74.3 | 43.7% |
| 9 | Gulf IslandAndroscoggin County | 19 | 115 | 68.4% |
| 10 | SkeltonYork County | 17 | 77.2 | 52.5% |
| 11 | Hydro Kennebec ProjectKennebec County | 15 | 32.4 | 24.0% |
| 12 | Pejepscot Hydroelectric ProjectSagadahoc County | 14 | 49.7 | 42.0% |
| 13 | Williams HydroSomerset County | 13 | 63.5 | 55.8% |
| 14 | West Enfield HydroPenobscot County | 13 | 70.2 | 61.6% |
| 15 | Weston HydroSomerset County | 12 | 57.0 | 54.2% |
| 16 | HiramCumberland County | 11 | 31.3 | 34.0% |
| 17 | Otis HydroFranklin County | 10 | 30.9 | 34.6% |
| 18 | International Paper Livermore HydroAndroscoggin County | 9.2 | 24.2 | 30.1% |
| 19 | Ellsworth Hydro StationHancock County | 8.9 | 18.3 | 23.4% |
| 20 | ShawmutSomerset County | 8.8 | 23.4 | 30.3% |
| 21 | Milford Hydro StationPenobscot County | 7.8 | 35.9 | 52.6% |
| 22 | West BuxtonYork County | 7.7 | 20.6 | 30.6% |
| 23 | Bonny EagleYork County · Hydro and battery storage | 7.2 | 31.3 | 53.4% |
| 24 | Lockwood Hydroelectric FacilityKennebec County | 7.2 | 13.0 | 20.6% |
| 25 | S D Warren WestbrookCumberland County | 7.2 | 15.0 | 2.5% |
| 26 | Aziscohos Hydroelectric ProjectOxford County | 6.7 | 29.8 | 50.8% |
| 27 | Cataract HydroYork County | 6.6 | 23.1 | 40.0% |
| 28 | International Paper Riley HydroFranklin County | 6.6 | 19.7 | 34.1% |
| 29 | Deer RipsAndroscoggin County | 6.5 | 50.8 | 89.1% |
| 30 | Benton Falls AssociatesKennebec County | 4.2 | 9.9 | 26.9% |
| 31 | Medway HydroPenobscot County | 4.0 | 22.9 | 65.4% |
| 32 | Orono BPenobscot County | 3.9 | 17.2 | 50.5% |
| 33 | Brassua Hydroelectric ProjectSomerset County | 3.6 | 10.9 | 34.7% |
| 34 | International Paper Jay HydroFranklin County | 3.1 | 11.7 | 43.0% |
| 35 | Messalonskee 2 (Oakland)Kennebec County | 2.8 | 6.8 | 27.8% |
| 36 | Orono Hydro StationPenobscot County | 2.7 | 6.2 | 26.1% |
| 37 | Stillwater BPenobscot County | 2.4 | 9.4 | 44.7% |
| 38 | North GorhamCumberland County | 2.2 | 6.5 | 33.5% |
| 39 | Stillwater Hydro StationPenobscot County | 1.8 | 5.9 | 37.5% |
| 40 | Messalonskee 5Kennebec County | 1.8 | 3.5 | 22.2% |
| 41 | Messalonskee 3Kennebec County | 1.6 | 3.8 | 26.9% |
| 42 | Barker LowerAndroscoggin County | 1.5 | 3.8 | 29.1% |
| 43 | Mechanic FallsAndroscoggin County | 1.4 | 1.9 | 15.3% |
| 44 | Salmon FallsYork County | 1.2 | 2.1 | 19.8% |
| 45 | Pittsfield HydroSomerset County | 1.1 | 2.7 | 27.7% |
| 46 | GardinerKennebec County | 1.0 | 3.2 | 36.0% |
| 47 | Pumpkin HillPenobscot County | 1.0 | 2.9 | 32.9% |
| 48 | Upper BarkerAndroscoggin County | 1.0 | 4.0 | 45.2% |
Projects where hydroelectric is the largest fuel or at least a fifth of nameplate capacity. MW is hydroelectric nameplate only; net generation covers the whole project. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources