Okinawa Yanbaru seawater pumped storage power plant
| Okinawa Yanbaru seawater pumped storage power plant | ||
|---|---|---|
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| location | ||
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| Coordinates | 26 ° 40 '25 " N , 128 ° 15' 56" E | |
| country |
 Japan
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| place | Kunigawa (Okinawa) | |
| Waters | Pacific Ocean | |
| power plant | ||
| operator | Dengen Kaihatsu KK (Electric Power Development Co., Ltd.) | |
| Shutdown | 2016 | |
| technology | ||
| Bottleneck performance | 30 megawatts | |
| Average height of fall |
136 m | |
| Expansion flow | 26 m³ / s | |
| Others | ||
The Okinawa Yanbaru seawater pumped storage power plant ( Japanese 沖 縄 や ん ば る 海水 揚 水 発 電 所 , Okinawa Yambaru Kaisui Yōsui Hatsudensho ) was a pumped storage plant located in Kunigami in the Japanese prefecture of Okinawa . It was operated by Dengen Kaihatsu KK (Electric Power Development Co., Ltd.). It was the first pumped storage plant to use seawater as energy storage. The maximum power duty was 30 M W . The pilot plant was dismantled in 2016 due to a lack of storage capacity.
investment
The upper reservoir is at a height of 136 m, the maximum water supply is 26 m³ / s. The maximum power is around 2.1% of the maximum power demand on the island of Okinawa measured on August 3, 2009.
The reservoir, which was artificially excavated, is about 600 m from the coast. He has an octagonal - planar m shape with a maximum width of the 252nd The maximum depth is 25 m and the effective storage capacity 564,000 m³. The entire inner surface of the storage tank is lined with impermeable foils in order to prevent the seawater from leaking into the surrounding vegetation and from damaging it.
Fiber-reinforced plastic pipes instead of steel pipes were used for the inlet and outlet to prevent seawater corrosion and the attachment of barnacles . The turbines are partly made of stainless steel to withstand the sea water.
A 66 kV line connected the power plant to the Okinawa Denryoku power grid .
history
The power plant was a pilot plant financed by the Agency for Natural Resources and Energy and built by Dengen Kaihatsu. A five-year test cycle has been in place since May 16, 1999. The Japanese Society for Civil Engineering awarded the EPDC the Outstanding Civil Engineering Achievement Award on May 26, 2000 for the construction of the power plant. The commercial facility existed until 2016.