Hydroelectric Power Plants in Maine
Every operating hydroelectric power plant in Maine on EIA-860M for 2026-07: 48 plants, 194 generating units and 700 MW of nameplate capacity across 11 counties, most of it inside ISO New England.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Plants
- 48
- 194 generating units
- Nameplate capacity
- 700 MW
- Counties
- 11
- Grid operator
- ISO New England
- covers most of these plants
Map of hydroelectric power plants in Maine
Every one of the 48 plants is drawn at the coordinate EIA files for it.
Loading map…
- Hydro · 48
List of hydroelectric power plants in Maine
Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.
| Great Lakes Hydro America - ME2 technologies | Great Lakes Hydro America LLC | Penobscot | 158 | 33 | 1917 | Operating |
| Harris HydroConventional Hydroelectric | Brookfield White Pine Hydro LLC | Somerset | 76.4 | 4 | 1954 | Operating |
| Wyman HydroConventional Hydroelectric | Brookfield White Pine Hydro LLC | Somerset | 72 | 3 | 1930 | Operating |
| Rumford Falls Hydro Facility2 technologies | Brookfield Power New England | Oxford | 52.5 | 7 | 1918 | Operating |
| Anson Abenaki HydrosConventional Hydroelectric | Eagle Creek Renewable Energy, LLC | Somerset | 29 | 13 | 1950 | Operating |
| Charles E MontyConventional Hydroelectric | Brookfield White Pine Hydro LLC | Androscoggin | 28.4 | 2 | 1990 | Operating |
| Brunswick HydroConventional Hydroelectric | Brookfield White Pine Hydro LLC | Cumberland | 19.6 | 3 | 1982 | Operating |
| Worumbo Hydro StationConventional Hydroelectric | Eagle Creek Renewable Energy, LLC | Androscoggin | 19.4 | 2 | 1989 | Operating |
| Gulf IslandConventional Hydroelectric | Brookfield White Pine Hydro LLC | Androscoggin | 19.2 | 3 | 1926 | Operating |
| SkeltonConventional Hydroelectric | Brookfield White Pine Hydro LLC | York | 16.8 | 2 | 1948 | Operating |
| Hydro Kennebec ProjectConventional Hydroelectric | Hydro Kennebec LLC | Kennebec | 15.4 | 2 | 1989 | Operating |
| Pejepscot Hydroelectric ProjectConventional Hydroelectric | Topsham Hydro Partners | Sagadahoc | 13.5 | 4 | 1987 | Operating |
| Williams HydroConventional Hydroelectric | Brookfield White Pine Hydro LLC | Somerset | 13 | 2 | 1939 | Operating |
| West Enfield HydroConventional Hydroelectric | Brookfield Black Bear Hydro, LLC | Penobscot | 13 | 2 | 1988 | Operating |
| Weston HydroConventional Hydroelectric | Brookfield White Pine Hydro LLC | Somerset | 12 | 4 | 1920 | Operating |
| HiramConventional Hydroelectric | Brookfield White Pine Hydro LLC | Cumberland | 10.5 | 2 | 1917 | Operating |
| Otis HydroConventional Hydroelectric | Eagle Creek Renewable Energy, LLC | Franklin | 10.2 | 2 | 1985 | Operating |
| International Paper Livermore HydroConventional Hydroelectric | Eagle Creek Renewable Energy, LLC | Androscoggin | 9.2 | 9 | 1910 | Operating |
| Ellsworth Hydro StationConventional Hydroelectric | Brookfield Black Bear Hydro, LLC | Hancock | 8.9 | 4 | 1924 | Operating |
| ShawmutConventional Hydroelectric | Brookfield White Pine Hydro LLC | Somerset | 8.8 | 8 | 1913 | Operating |
| Milford Hydro StationConventional Hydroelectric | Brookfield Black Bear Hydro, LLC | Penobscot | 7.8 | 6 | 1941 | Operating |
| West BuxtonConventional Hydroelectric | Brookfield White Pine Hydro LLC | York | 7.7 | 6 | 1904 | Operating |
| Lockwood Hydroelectric FacilityConventional Hydroelectric | Merimil Ltd Partnership | Kennebec | 7.2 | 7 | 1985 | Operating |
| Aziscohos Hydroelectric ProjectConventional Hydroelectric | Brookfield White Pine Hydro LLC | Oxford | 6.7 | 1 | 1988 | Operating |
| Cataract HydroConventional Hydroelectric | Brookfield White Pine Hydro LLC | York | 6.6 | 1 | 1937 | Operating |
| International Paper Riley HydroConventional Hydroelectric | Eagle Creek Renewable Energy, LLC | Franklin | 6.6 | 6 | 1981 | Operating |
| Deer RipsConventional Hydroelectric | Brookfield White Pine Hydro LLC | Androscoggin | 6.5 | 7 | 1903 | Operating |
| Benton Falls AssociatesConventional Hydroelectric | Essex Hydro Associates LLC | Kennebec | 4.2 | 2 | 1987 | Operating |
| Medway HydroConventional Hydroelectric | Brookfield Black Bear Hydro, LLC | Penobscot | 4 | 5 | 1923 | Operating |
| Orono BConventional Hydroelectric | Brookfield Black Bear Hydro, LLC | Penobscot | 3.9 | 3 | 2013 | Operating |
| Brassua Hydroelectric ProjectConventional Hydroelectric | Brassua Hydroelectric LP | Somerset | 3.6 | 1 | 1989 | Operating |
| International Paper Jay HydroConventional Hydroelectric | Eagle Creek Renewable Energy, LLC | Franklin | 3.1 | 6 | 1912 | Operating |
| Messalonskee 2 (Oakland)Conventional Hydroelectric | Messalonskee Stream Hydro LLC | Kennebec | 2.8 | 1 | 1924 | Operating |
| Orono Hydro StationConventional Hydroelectric | Brookfield Black Bear Hydro, LLC | Penobscot | 2.7 | 4 | 2009 | Operating |
| Stillwater BConventional Hydroelectric | Brookfield Black Bear Hydro, LLC | Penobscot | 2.4 | 3 | 2013 | Operating |
| North GorhamConventional Hydroelectric | Brookfield White Pine Hydro LLC | Cumberland | 2.2 | 2 | 1925 | Operating |
| Stillwater Hydro StationConventional Hydroelectric | Brookfield Black Bear Hydro, LLC | Penobscot | 1.8 | 4 | 1913 | Operating |
| Messalonskee 5Conventional Hydroelectric | Messalonskee Stream Hydro LLC | Kennebec | 1.8 | 1 | 1935 | Operating |
| Messalonskee 3Conventional Hydroelectric | Messalonskee Stream Hydro LLC | Kennebec | 1.6 | 1 | 1918 | Operating |
| Upper AndroscogginConventional Hydroelectric | Lewiston, City of - (ME) | Androscoggin | 1.6 | 3 | 1920 | Out of service and NOT expected to return to service in next calendar year |
| Squa Pan Hydro StationConventional Hydroelectric | Algonquin Northern Maine | Aroostook | 1.5 | 1 | 1941 | Standby/Backup |
| Barker LowerConventional Hydroelectric | KEI (Maine) Power Management (III) LLC | Androscoggin | 1.5 | 1 | 1986 | Operating |
| Mechanic FallsConventional Hydroelectric | KEI (Maine) Power Management (IV) LLC | Androscoggin | 1.4 | 2 | 1986 | Operating |
| Salmon FallsConventional Hydroelectric | Green Mountain Power Corp | York | 1.2 | 3 | 1986 | Operating |
| Pittsfield HydroConventional Hydroelectric | KEI (Maine) Power Management (II) LLC | Somerset | 1.1 | 3 | 1986 | Operating |
| GardinerConventional Hydroelectric | KEI (Maine) Power Management (III) LLC | Kennebec | 1 | 1 | 1985 | Operating |
| Pumpkin HillConventional Hydroelectric | KEI (Maine) Power Management (II) LLC | Penobscot | 1 | 1 | 1987 | Operating |
| Upper BarkerConventional Hydroelectric | KEI (Maine) Power Management (III) LLC | Androscoggin | 1 | 1 | 1987 | Operating |
Largest hydroelectric power plants in Maine
- 1Great Lakes Hydro America - MEPenobscot County, Maine158 MW
- 2Harris HydroSomerset County, Maine76.4 MW
- 3Wyman HydroSomerset County, Maine72 MW
- 4Rumford Falls Hydro FacilityOxford County, Maine52.5 MW
- 5Anson Abenaki HydrosSomerset County, Maine29 MW
- 6Charles E MontyAndroscoggin County, Maine28.4 MW
- 7Brunswick HydroCumberland County, Maine19.6 MW
- 8Worumbo Hydro StationAndroscoggin County, Maine19.4 MW
- 9Gulf IslandAndroscoggin County, Maine19.2 MW
- 10SkeltonYork County, Maine16.8 MW
Hydroelectric power plants by county in Maine
The county EIA files against each plant. It is the fastest way to find the plant nearest a given town.
| County | Plants | Nameplate MW |
|---|---|---|
| Somerset | 8 | 215.9 |
| Penobscot | 9 | 194.6 |
| Androscoggin | 9 | 88.2 |
| Oxford | 2 | 59.2 |
| Kennebec | 7 | 34 |
| Cumberland | 3 | 32.3 |
| York | 4 | 32.3 |
| Franklin | 3 | 19.9 |
| Sagadahoc | 1 | 13.5 |
| Hancock | 1 | 8.9 |
| Aroostook | 1 | 1.5 |
Hydroelectric Power Plants in Maine: FAQ
- How many hydroelectric power plants are in Maine?
- 48, with 700 MW of nameplate capacity between them, spread over 11 counties. That is the EIA-860M operating count for 2026-07.
- Is there a map of Maine hydroelectric power plants?
- Yes — the map above. Each dot is one hydroelectric power plant, sized by nameplate capacity and placed at the coordinates EIA files for it.
- Which is the largest hydroelectric power plant in Maine?
- Great Lakes Hydro America - ME, at 158 MW. The table is sorted largest first, so the rest follow it.
- Is there a hydroelectric power plant near me in Maine?
- The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.
- Which grid operator runs Maine's hydroelectric power plants?
- Most of them sit inside ISO New England, according to the balancing-authority code EIA files against each plant. Live conditions for that market are on this site.
- How current is this, and what is left out?
- EIA-860M for 2026-07. Conventional hydroelectric. Pumped storage is counted separately. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.