NY

Stillwater Hydro Electric Project P-4684

General information

Waterway  Hudson River
Current status  Active 
Type of facility Conventional Hydro
Mode of hydropower generation Run-of-river
Type of permit FERC License

FERC information

FERC docket # P-4684
Permit issued 5/15/1987
Permit expires 4/26/2027

Ownership and operation

Owner GR CATALYST ONE, LLC
Owner type Private Non-utility
Year first online (conventional hydro) 1993
Transmission or distribution system owner Niagara Mohawk Power Corp.

Power and generating capacity

Number of units 2
Total capacity from hydraulic turbine-generator units within each plant 3.4 mW
Average annual net hydropower generation 10,659.5 mWH

The Stillwater Hydroelectric Project is a run-of-river facility located on the Stillwater Branch of the Penobscot River in Old Town, Maine with a generating capacity of 1.95 MW. The Stillwater Project began commercial operations in 1913.

The Stillwater Project’s principal features are a 1,720 foot long dam, consisting of 13 sections, a concrete and wood powerhouse, a 3.1 mile long impoundment with a surface area of 300 acres. The existing project has an installed capacity of 1.95 MW and an average annual generation of about 13.1 gigawatt hours (GWh). The maximum hydraulic capacity of the Stillwater Project is 1,700 cubic feet per second (cfs). Flows in the Stillwater Branch exceed the maximum hydraulic capacity of the project 60 percent of the time.

The Stillwater Hydroelectric Project is one of the three projects included in the the Penobscot River Restoration Agreement. The other two are: Orono Hydroelectric Project (P-2710) and Medway Hydroelectric Project (P-2666).