Heimifeng Pumped Storage Power Station

The Heimifeng Pumped Storage Power Station is located at the hills of Heimifeng, Qiaoyi town, Wangcheng district, 25 kilometres (16 mi) north of Changsha in Hunan province, China. It was constructed between 2005 and 2009 with the generators being commissioned in 2009 and 2010. The station generates power by transferring water between an upper and lower reservoir. When energy demand is high, water from the upper reservoir is released and used to generate electricity before being discharged into the lower reservoir. During times of low demand, water from the lower reservoir is then pumped back up to replenish upper reservoir. This process allows the station to meet peak energy demand and it can go from standstill to operational in three minutes. The upper reservoir is located at an elevation of 400 metres (1, 300 ft) formed by two main dams and two auxiliary dams. The main dams are 69.5-metre (228 ft) and 59.5-metre (195 ft) high concrete-face rock-fill dams (CFRD). Helping to support the reservoir is an additional 39.5-metre (130 ft) CFRD and a 19.5-metre (64 ft) tall gravity dam. The upper reservoir has a storage capacity of 9,965,000 cubic metres (8, 079 acre⋅ft). The lower reservoir sits at an elevation of 103.7 metres (340 ft) and is 1 kilometre (0.62 mi) north of the lower reservoir. It is created by a 79.5-metre (261 ft) tall rock-fill dam which withholds a reser

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