Okinawa Yanbaru Seawater Pumped Storage Power Station
 The seawater intake/outlet faces the Philippine Sea, which serves as the lower reservoir for this power station. The upper reservoir is not shown in this picture. |
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| Country | Japan |
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| Location | Kunigami, Okinawa |
| Coordinates | 26°40′25″N 128°15′56″E / 26.67361°N 128.26556°ECoordinates: 26°40′25″N 128°15′56″E / 26.67361°N 128.26556°E |
| Commission date | 1999-05-16 |
| Operator(s) | Electric Power Development Company |
| Reservoir information | |
| Reservoir capacity | 564,000 m³ |
| Maximum depth | 25 m |
| Lower reservoir | Philippine Sea |
| Power generation information | |
| Installed capacity | 30 MW |
The Okinawa Yanbaru Seawater Pumped Storage Power Station (沖縄やんばる海水揚水発電所 Okinawa Yanbaru Kaisui Yōsui Hatsudensho) is a hydroelectric power station located in Kunigami, Okinawa, Japan and operated by the Electric Power Development Company. It is the world’s first pumped-storage to use seawater for storing energy.[1] Its maximum output is 30 MW.[2]
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Facility [edit]
The power station is a pure pumped-storage, using the Philippine Sea as its lower reservoir, with effective drop of 136 m and maximum flow of 26 m³/s.[2] Its pipelines and pump turbine are installed underground.[2] Its maximum output is approximately 2.1% of the maximum power demand in the Okinawa Island recorded on August 3, 2009.[3]
The upper reservoir, artificially excavated, lies approximately 600 m away from the seashore and approximately 150 m above the sea level.[2] It has an octagonal planar shape with its maximum width of 252 m.[2] Its maximum depth is 25 m and its effective storage capacity is 564,000 m³.[2] The entire inner surface of the reservoir is covered with an impermeable liner to prevent seawater from leaking and damaging the surrounding vegetation.[2]
Fiber-reinforced plastic tubes instead of steel tubes were adopted for the penstock and the tailrace in order to avoid seawater corrosion and adhesion of barnacles.[1] The pump turbine is partially made of stainless steel resistant to seawater.[1][4]
A 66 kV line connects the power station with the power grid of The Okinawa Electric Power Company.[5]
History [edit]
The power station was a pilot plant funded by the Agency for Natural Resources and Energy and constructed by the Electric Power Development Company.[5] A five-year verification operation was conducted since May 16, 1999.[1] The Japan Society of Civil Engineers presented the company an Outstanding Civil Engineering Achievement Award on May 26, 2000 for its construction of the plant.[6] It is now under commercial operation.
See also [edit]
References [edit]
- ^ a b c d "沖縄やんばる海水揚水発電所の実証試験運転開始について[[Category:Articles containing Japanese language text]]" [Verification operation started at Okinawa Yanbaru Seawater Pumped Storage Power Station]. News Release (in Japanese). Electric Power Development Company. 17 March 1999. Wikilink embedded in URL title (help)
- ^ a b c d e f g Shibuya, Yōko; Ishimura, Yōsuke (March 2010). "学生が行く今月の土木日本一: 世界初の海水揚水発電所: 沖縄やんばる海水揚水発電所[[Category:Articles containing Japanese language text]]" [This month’s civil engineering number one in Japan visited by students: World’s first seawater pumped-storage power station: Okinawa Yanbaru Seawater Pumped Storage Power Station] (PDF). JSCE Magazine (in Japanese) 95 (3): 34–35. ISSN 0021-468X. Wikilink embedded in URL title (help)
- ^ "最大電力の記録を更新 (今年2回目)[[Category:Articles containing Japanese language text]]" [Maximum power demand again hits record high] (PDF). Press Release (in Japanese). Okinawa Electric Power Company. 4 August 2009. Wikilink embedded in URL title (help)
- ^ Fujihara, Tetsuo; Imano, Haruo; Oshima, Katsuhiro (October 1998). "Development of pump turbine for seawater pumped-storage power plant" (PDF). Hitachi Review 47 (5): 199–202. ISSN 0018-277X.
- ^ a b Ōmoto, Kazuhiro (October 1994). "現場を訪ねて: 沖縄海水揚水建設所: 自然にやさしく[[Category:Articles containing Japanese language text]]" [Visiting construction site: Okinawa Yanbaru Seawater Pumped Storage Power Station: Nature-friendly]. Soil Mechanics and Foundation Engineering (in Japanese) 42 (10): 47–50. ISSN 0041-3798. Wikilink embedded in URL title (help)
- ^ "「沖縄やんばる海水揚水発電所の建設」の土木学会技術賞の受賞について[[Category:Articles containing Japanese language text]]" [JSCE Outstanding Civil Engineering Achievement Award for construction of Okinawa Yanbaru Seawater Pumped Storage Power Station]. News Release (in Japanese). Electric Power Development Company. 26 May 2000. Wikilink embedded in URL title (help)
External links [edit]
- Okinawa Yanbaru Seawater Pumped Storage Power Station (Official site, in Japanese)
- "Seawater Pumped-Storage Power Plant". Japan Commission on Large Dams. Archived from the original on 2002-07-08.
- "沖縄やんばる海水揚水発電所". Panoramio. 2008-12-31.
- "The Okinawa Yanbaru Seawater Pumped Storage Power Plant". flickr. 2008-11-11.
