Okukiyotsu Pumped Storage Power Station

Okukiyotsu Pumped Storage Power Station
Location of Okukiyotsu Pumped Storage Power Station in Japan
Country Japan
Location Yuzawa, Minamiuonuma, Niigata Prefecture
Coordinates 36°50′37.00″N 138°45′58.00″E / 36.8436111°N 138.7661111°E / 36.8436111; 138.7661111Coordinates: 36°50′37.00″N 138°45′58.00″E / 36.8436111°N 138.7661111°E / 36.8436111; 138.7661111
Status Operational
Operator(s) J-Power
Pumped-storage power station
Upper reservoir Tashiro lake
Upper res. capacity 11,400,000 m3 (9,200 acre·ft) (effective)
Lower reservoir Kiyotsu river
Lower res. capacity 11,400,000 m3 (9,200 acre·ft) (effective)
Hydraulic head 470 m (1,540 ft)
Pump-generators No. 1: 4 x 260 MW reversible Francis turbines
No. 2: 2 x 310 MW reversible Francis turbines
Power generation
Nameplate capacity 1,600 MW (2,100,000 hp)

The Okukiyotsu Pumped Storage Power Station (Japanese: 奥清津発電所 Hepburn: Okukiyotsu Hatsudensho) No. 1 and No. 2 are two large pumped-storage hydroelectric power plants in Yuzawa, Minamiuonuma, Niigata Prefecture, Japan. With a combined installed capacity of 1,600 megawatts (2,100,000 hp),[1] the system is the third largest pumped-storage power station in Japan.

The facilities are run by Electric Power Development Company (J-Power).[1] Like most pumped-storage facilities, the power station uses two reservoirs, releasing and pumping as the demand rises and falls. Tashiro lake, formed by the Kassa Dam, is the upper artificial reservoir, while Futai Dam on the Kiyotsu river forms the lower reservoir.[2] Both dams are rockfill type dams, with a height of 90 m and 87 m, respectively.[3] The reservoirs were built between 1972 and 1978.

Okukiyotsu No. 1 is the first plant to be built on the site, and employs four 260 MW pump/generator units, for a total net capacity of 1000 MW.[4] The maximum water flow is 260 cubic meters per second. Construction on the plant started in 1972 and it became operational between 1978 and 1982.[1]

Okukiyotsu No. 2 is a later addition to the site. The plant is composed of two adjustable speed pump/generator units for a combined power capacity of 600 MW and a maximum water flow of 154 cubic meters per second.[4] Adjustable speed units allow for a rapid variation of power levels during both pumping and generation. These were the highest hydraulic head adjustable speed units in the world. Construction of the second plant started in 1992 and it became operational in 1996.[1] Both plants have an effective head of 470 m.[1]

Some of the interior of the second power plant can be visited by the public. The Okky Museum, managed by J-Power, also provides models of the station and explicatory panels and media.[2]

See also

Notes

  1. 1 2 3 4 5 "水力発電所ギャラリー　電源開発奥清津発電所、奥清津第二発電所 - 水力ドットコム". www.suiryoku.com. Retrieved 4 November 2016.
  2. 1 2 "奥清津発電所　-OKKY-". www.jpower.co.jp. Retrieved 4 November 2016.
  3. ↑ "Kassa Dam ［Niigata Pref.］ - Dams in Japan". damnet.or.jp. Retrieved 4 November 2016.
  4. 1 2 "J-POWER | International Activities | Our Facilities". www.jpower.co.jp. Retrieved 4 November 2016.
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