Imaichi Pumped Storage Power Station

The Imaichi Pumped Storage Power Station (Hepburn: Imaichi Hatsudensho) is a large pumped-storage hydroelectric power station in Tochigi Prefecture, Japan. With a total installed capacity of 1,050 megawatts (1, 410, 000 hp), it is one of the largest pumped-storage power stations in Japan. The facility is run by the Tokyo Electric Power Company (TEPCO). The power plant started operation in July 1988 with a capacity of 350 MW (one unit operational). The other two units entered operation in December 1991. The plant is one of the many large scale pure pumped-storage plants built in Japan since the 1970s to compensate for the increased penetration of base-load nuclear power and peak load from cooling and air-conditioning. Like most pumped-storage facilities, the power station uses two reservoirs, releasing and pumping as the demand rises and falls. The upper reservoir is contained by the Imaichi Dam, a concrete gravity dam, at an altitude of 512 m. The reservoir is fed by the Togawa river. The lower reservoir is contained by the Kuriyama Dam, a rock-fill embankment dam at an altitude of 1054 m. The reservoirs can store 9,100,000 cubic metres (7, 400 acreft) of water. Of that storage volume, 6,200,000 cubic metres (5, 000 acreft) can be used for power generation. This is enough for about 7 hours of operation at full generation capacity, giving a total energy storage capacit

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