Omarugawa Pumped Storage Power Station

Coordinates: 32°14′52″N 131°22′25″E / 32.2478°N 131.3735°E / 32.2478; 131.3735

Omarugawa Pumped Storage Power Station
Country Japan
Location Kijo, Koyu District, Miyazaki Prefecture
Status Operational
Construction began 1997
Commission date 2007-2011[1]
Operator(s) Kyushu Electric Power Company
Pumped-storage power station
Upper reservoir Ishikawauchi upper reservoir
Upper res. capacity 6,200,000 m3 (5,000 acre⋅ft)
Lower reservoir Ishikawauchi lower reservoir
Hydraulic head 646 m (2,119 ft)[1]
Pump-generators 4 x 300 MW reversible Francis turbines
Power generation
Nameplate capacity 1,200 MW (1,600,000 hp)

The Omarugawa Pumped Storage Power Station (Japanese: 小丸川発電所, Hepburn: Omarugawa Hatsudensho) is a large pumped-storage hydroelectric power station in Kijo in the Koyu District of Miyazaki Prefecture, Japan. With a total installed capacity of 1,200 megawatts (1,600,000 hp), it is one of the largest pumped-storage power stations in Japan.

The facility is run by the Kyushu Electric Power Company. The power plant started operation in July 2007 and all four units were commissioned by July 2011. Like most pumped-storage facilities, the power station uses two reservoirs, releasing and pumping as the demand rises and falls. Oseuchi Dam and Kanasumi Dam[2] form the upper artificial reservoir, while Ishikawauchi Dam on the Omaru river (Omarugawa) forms the lower reservoir.[3] Ishikawauchi Dam is a 47.5 m concrete gravity dam, while Oseuchi and Kanasumi dams are rock-fill dams, 65.5 m and 42.5 m high, respectively. The natural influx on water on the upper reservoir is limited, therefore the plant can be considered almost pure pumped-storage. The entire upper pond was made waterproof with asphalt to avoid leakage in the surrounding permeable soil.[4]

The two reservoirs are connected through underground penstocks. The power plant is located underground in the middle.[1] The power station employs 4 pump-generators. Unit 1 and 4 were manufactured by Hitachi,[5] while units 2 and 3 are from Mitsubishi. The maximum amount of water used by the plant is 222 cubic meters per second, for an effective storage capacity of 7 hours. All units are adjustable speed systems, allowing for a rapid variation of power levels during both pumping and generation.[6]

A visitor's center, Pino' Q Park, was opened by Kyushu Electric Power in July 2008. The center features miniature models of the power plant, videos and other media to explain the operation of the pumped-storage plant.[7]

See also

Notes

  1. 1 2 3 "九州電力　小丸川発電所の概要". www.kyuden.co.jp. Retrieved 1 November 2016.
  2. ↑ "Kanasumi Dam ［Miyazaki Pref.］ - Dams in Japan". damnet.or.jp. Retrieved 1 November 2016.
  3. ↑ "Ishikawauchi Dam ［Miyazaki Pref.］ - Dams in Japan". damnet.or.jp. Retrieved 1 November 2016.
  4. ↑ "大瀬内ダム［宮崎県］ - ダム便覧". damnet.or.jp. Retrieved 1 November 2016.
  5. ↑ "Hitachi's Adjustable-speed Pumped-storage System Contributing to Prevention of Global Warming" (PDF). HItachi. Retrieved 1 November 2016.
  6. ↑ "小丸川発電所　３号機（３０万ｋＷ）の営業運転開始について" (PDF). www.kyuden.co.jp. Kyushu Electric Power Company. Retrieved 1 November 2016.
  7. ↑ "木城町ホームページ 中八重緑地公園・ピノッＱパーク". 木城町ホームページ. Retrieved 1 November 2016.
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