Nanpil River Hydropower Project

by Christian J. Gantenbein, U.S. Army Corps of Engineers, United States,

Document Type: Proceeding Paper

Part of: Waterpower '89


The Nanpil River Hydropower Project is located on the island of Pohnpei in the Federated States of Micronesia, East Caroline Islands located in the Pacific Ocean. The project consists of an intake structure, a 4,600-foot-long buried penstock, a powerhouse with two horizontal Francis turbines, associated electrical and mechanical control equipment and a 9,000-foot-long, 13,800-volt transmission line. The plant capacity is 1,700 kilowatts with an average annual production of 4,020,000 kilowatt-hours. The powerhouse is a run-of-the-river design with headwater level control designed to operate in parallel with Pohnpei's existing diesel power generating system. This paper covers the original design concept, major design changes during project construction and the reasons for these changes, project startup and the performance of commissioning tests.

Subject Headings: Hydro power | Project management | Power plants | Rivers and streams | Electric power | Electrical equipment | Hydraulic design | Power transmission lines | Micronesia | Oceania | Pacific Ocean | United States

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