Explore the largest hydro power plants in Maine and see all the utility-scale hydro projects in Maine on a map.
Last updated: May 2026
On this page, you can explore our real-time database of hydro power plants in Maine. Each month, we track hydro projects and update our list of the largest hydro power plants in Maine.
As of May 2026, there are 51 utility-scale hydro power plants in Maine, according to Cleanview's project tracker. Their total operating capacity is 705 MW.
Total Hydro Power Plants
51
Total Capacity
705 MW
Built in 2025
0
Map of hydro power plants in Maine. Marker size reflects capacity — only facilities with reported capacity data are shown.
138 MW
Year Operational: July 1988
Location: Penobscot, Maine
76 MW
Year Operational: January 1955
Location: Somerset, Maine
72 MW
Year Operational: January 1940
Location: Somerset, Maine
45 MW
Year Operational: October 1954
Location: Oxford, Maine
29 MW
Year Operational: April 2008
Location: Somerset, Maine
28 MW
Year Operational: January 1990
Location: Androscoggin, Maine
20 MW
Year Operational: April 1983
Location: Cumberland, Maine
19 MW
Year Operational: March 1989
Location: Androscoggin, Maine
19 MW
Year Operational: January 1926
Location: Androscoggin, Maine
4 MW
Year Operational: November 2013
Location: Penobscot, Maine
2 MW
Year Operational: September 2013
Location: Penobscot, Maine
8 MW
Year Operational: November 2011
Location: Penobscot, Maine
3 MW
Year Operational: March 2009
Location: Penobscot, Maine
29 MW
Year Operational: April 2008
Location: Somerset, Maine
9 MW
Year Operational: September 2004
Location: Androscoggin, Maine
28 MW
Year Operational: January 1990
Location: Androscoggin, Maine
4 MW
Year Operational: September 1989
Location: Somerset, Maine
19 MW
Year Operational: March 1989
Location: Androscoggin, Maine
Cleanview