Kazunogawa Pumped Storage Power Station
…acre⋅ft) is active (or "useful) for pumping into the upper reservoir. When energy demand is high, water from the upper reservoir is released down to the underground power station via a single 3.3 kilometres (2.1 mi) long headrace tunnel which splits into two 1.8 kilometres (1.1 mi) tunnels before each separate into two 620 metres…