Shin-Takasegawa Pumped Storage Station The Shin-Takasegawa Pumped Storage Station uses the Takase River to operate a pumped storage hydroelectric scheme about west of Ōmachi in Nagano Prefecture , Japan. Part of the system is within Chūbu-Sangaku National Park . Construction on the complex began in 1971, concluded in 1978 and the power station was commissioned in 1980. The power plant has a installed capacity and its upper reservoir is created by the Takase Dam , a rock-fill dam — which at in height is the tallest of its type in Japan. It is also the second tallest dam in Japan, next to Kurobe Dam .Design and operation When energy demand is low and therefore electricity less expensive, the turbines reverse and pump water from the lower reservoir back into the upper reservoir. This process repeats depending upon energy demand and water availability . Water released from the lower reservoir is used to power the Nakanosawa Power Station which uses of hydraulic head to power a single Francis turbine generator . It was commissioned in May 1980 .Takase Dam Creating the upper reservoir is the Takase Dam which is a tall and long rock-fill embankment dam with a structural volume of. The Takase Reservoir has a capacity of which only is active for power generation . The low active capacity of the reservoir is due to the high levels of silt in the Takase River which cause the reservoir to reserve 79 percent of its capacity for this purpose. During operation, the upper reservoir only draws down. During periods of high energy demand, water from the Takase Reservoir is released down to the power station. After received by the intake, water initially travels along two diameter and long head-race tunnels. At the terminus of these tunnels, they split into four long penstocks which drop down a deep shaft to the underground power station . At the power station, the water operates four reversible Francis turbine-generators before being discharged into the lower reservoir, created by the Nanakura Dam .Nanakura Dam The Nanakura Dam is a tall and long rock-fill embankment dam with a structural volume of. The reservoir created by the dam, the lower reservoir, has a capacity of which is active. To protect in against rapid draw-down in water levels, the top of the dam is coated in hard rock materials.
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