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 acre⋅ft) of water. Of that storage volume, 6,200,000 cubic metres (5, 000 acre⋅ft) 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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