Shimogo Pumped Storage Power Station

The Shimogo Pumped Storage Power Station (Hepburn: Shimogō Hatsudensho) is a large pumped-storage hydroelectric power plant in Shimogō, Minamiaizu, Fukushima Prefecture, Japan. With an installed capacity of 1,000 megawatts (1, 300, 000 hp), the system is one of the largest pumped-storage power stations in Japan. The facility is run by Electric Power Development Company (J-Power). Like most pumped-storage facilities, the power station uses two reservoirs, releasing and pumping as the demand rises and falls. The Ouchi Dam Reservoir, formed by the Ouchi Dam, is the upper artificial reservoir, while Okawa Dam forms the lower reservoir. Ogawa Dam is a rockfill-concrete gravity combined dam, with a height of 75 m and a length of 406 m. Construction on the dam started in 1971 and was completed in 1987. The dam is also used for flood control, irrigation, and domestic and industrial water supply. Ouchi Dam is a rockfill dam with a height of 102 m and a length of 340 m. Construction started in 1974 and was completed in 1991. The power plant employs four 250 MW pump/generator units, for a total net capacity of 1000 MW. The maximum water flow is 314 cubic meters per second. Unit 1 and 2 became operational in April 1988 after the completion of the Okawa Dam. Units 3 and 4 were commissioned in 1991. The station includes a visitor center with a model of the power station and media t

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