Okuyahagi Pumped Storage Power Station

The Okuyahagi Pumped Storage Power Station (Japanese: 奥矢作発電所, Hepburn: Okuyahagi Hatsudensho) is a group of large pumped-storage hydroelectric power plants and smaller conventional plants located in Toyota, Aichi Prefecture, and Ena, Gifu Prefecture, Japan. With a combined installed capacity of 1,160 megawatts (1,560,000 hp), it is among the largest pumped-storage power stations in Japan.

Okuyahagi Pumped Storage Power Station
CountryJapan
LocationToyota, Aichi Prefecture
Ena, Gifu Prefecture
Coordinates35°13′56.03″N 137°25′42.95″E
StatusOperational
Operator(s)Chubu Electric Power Company
Upper reservoir
Total capacity9,900,000 m3 (8,000 acre⋅ft) (Kuroda Dam lake, effective)
Lower reservoir
Creates80,000,000 m3 (65,000 acre⋅ft) (Yahagi Dam reservoir)
Power Station
Hydraulic headOkuyahagi 1: 161 m (528 ft)
Okuyahagi 2: 404 m (1,325 ft)
Pump-generators3 x 116 MW reversible Francis turbines (Okuyahagi 1)
3 x 260 MW reversible Francis turbines (Okuyahagi 2)
2 x 31 MW Francis turbines (Yahagi 1)
1 x 32 MW Francis turbine (Yahagi 2)
Installed capacity1,160 MW (1,560,000 hp)

The facilities are run by the Chubu Electric Power Company. The station includes 4 distinct power plants. The first two power plants, Yahagi 1 and 2 are conventional power plants.[1][2] The other two plants, Okuyahagi 1 and 2 are pumped-storage plants. Yahagi 1 uses water from the Yahagi Dam (矢作ダム)[3] and has a capacity of 60 MW.[4] Yahagi 2 uses water from the Second Yahagi Dam (矢作第二ダム),[5] a smaller dam downstream of the main one, and has a capacity of 31.2 MW.

The pumped-storage station has an unconventional configuration, with three reservoirs at different heights.[6] The lower reservoir is created by Yahagi Dam on the Yahagi river. The upper reservoir is the Kuroda Dam lake, an artificial lake created by the Kuroda Dam. A third reservoir, in between the two at an intermediate elevation is formed by the Tominaga Dam. The two Okuyahagi power stations work in tandem between the three reservoirs.[6][7][8] This configuration was necessary because of the geological conditions in the area, with a fault that prevented the safe construction of a single connection between upper and lower reservoirs.[6] Okuyahagi 1 is the upper power plant, operating between the upper and the intermediate reservoir using 3 units with a combined capacity of 323 MW.[4] The first unit started operation in September 1980, while the second and third units became operational in February 1981. The Okuyahagi 2 is the lower power plant operating between the intermediate reservoir and the lower reservoir employing 3 units with a combined capacity of 780 MW.[4] Okuyahagi 2 became operational together with the first plant, with the first unit online in September 1980 and the other 2 in February 1981.[6] The two plants operate as a single power station.[6] Both station have a maximum water flow rate of 234 cubic meter per second.[6]

  • Yahagi Dam
  • Yahagi Dam lake (lower reservoir)
  • Second Yahagi Dam
  • Tominaga Dam (intermediate reservoir)
  • Kuroda Dam (upper reservoir)

See also

Notes
  1. "水力発電所ギャラリー　中部電力矢作第一発電所 - 水力ドットコム". www.suiryoku.com. Retrieved 4 November 2016.
  2. "水力発電所ギャラリー　中部電力矢作第二発電所 - 水力ドットコム". www.suiryoku.com. Retrieved 4 November 2016.
  3. "Yahagi Dam ［Aichi Pref.］ - Dams in Japan". damnet.or.jp. Retrieved 4 November 2016.
  4. "Chubu Electric Power Co.,Inc. | Power System Map and Generating Facilities - Reference". www.chuden.co.jp. Retrieved 4 November 2016.
  5. "矢作第二ダム［愛知県］ - ダム便覧". damnet.or.jp. Retrieved 4 November 2016.
  6. "中部電力｜奥矢作第一・第二発電所 - 中部電力の水力発電所". www.chuden.co.jp. Retrieved 4 November 2016.
  7. "Okuyahagi No. 1 Pumped Hydro Power Station Japan - GEO". globalenergyobservatory.org. Retrieved 4 November 2016.
  8. "Okuyahagi No. 2 Pumped Hydro Power Station Japan - GEO". globalenergyobservatory.org. Retrieved 4 November 2016.
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