Okinawa Yanbaru Seawater Pumped Storage Power Station

The seawater pumped-storage power plant Yanbaru Okinawa (Japanese沖縄やんばる海水揚水発電所, Okinawa Yambaru Kaisui Yosui Hatsudensho ) is a pumped storage plant, which is located in Motobu in the Japanese prefecture of Okinawa. It is of Dengen Kaihatsu K. K. (English Electric Power Development Co., Ltd.). operated. It is the first pumped storage power station, which uses sea water as an energy store. The maximum output power is 30 MW.

Plant

The upper reservoir is located at an altitude of 136 m, the maximum water supply is 26 m³ / s The maximum power is about 2.1 % of the maximum electricity demand on the island of Okinawa measured on August 3, 2009.

The memory that was artificially excavated lies about 600 m away from the coast. It has an octagonal - planar shape with a maximum width of 252 m. The maximum depth is 25 m and the effective storage capacity of 564,000 m³. The entire inner surface of the storage is coated with impermeable film to prevent leakage of sea water into the surrounding vegetation, damage to the same.

Fibre-reinforced plastic pipes instead of steel pipes were used for the inlet and outlet to prevent saltwater corrosion and the adhesion of barnacles. The turbines are partially made of stainless steel, to withstand the seawater.

A 66 - kV transmission line connecting the power plant to the power grid of Okinawa Denryoku.

History

The power plant was a pilot power plant, which was funded by the Agency for Natural Resources and Energy and built by Dengen Kaihatsu. A five -year cycle has been carried out since 16 May 1999. The Japanese Society of Civil Engineering awarded the EPDC the Outstanding Civil Engineering Achievement Award on 26 May 2000 for the construction of the power plant. It is now a commercial plant.

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