Mossyrock is a 300MW hydro power project. It is located on Cowlitz river/basin in Washington, the US. The project is currently active. It has been developed in single phase. Post completion of construction, the project got commissioned in 1968.

Project Type Total Capacity (MW) Active Capacity (MW) Pipeline Capacity (MW) Project Status Project Location Project Developer
Hydropower 300 300 Active Washington, the US


The project is currently owned by Tacoma Power.

Development Status

The project got commissioned in 1968.

Power Purchase Agreement

The power generated from the project is sold to Tacoma Power under a power purchase agreement.

Contractors Involved

Nydqvist & Holm was selected as the turbine supplier for the hydro power project. The company provided 2 units of francis turbines, each with 154MW nameplate capacity.

Brown Boveri & Cie supplied 2 electric generators for the project. The generator capacity is 167 MVA.


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