Kurokawa Dam, officially known as the Okutataragi Power Station, is Japan's largest pumped-storage power plant, equipped with six generators deep within the mountains.

Pumped-storage hydroelectricity is a power generation method that uses electricity during nighttime hours, when power supply is relatively abundant, to pump water into an upper reservoir. During daytime hours when electricity demand increases, this water is released to generate electricity in the lower reservoir. The Tataragi Dam is connected at its base. (Excerpted from the Kansai Electric Power Co., Inc. website)

Moreover, the imposing appearance of the 98-meater-high rock-fill dam is truly spectacular.