Okutataragi Pumped Storage Power Station

The Okutataragi Pumped Storage Power Station (奥多々良木発電所) is a large pumped-storage hydroelectric power station in Asago, in the Hyōgo Prefecture of Japan. With a total installed capacity of 1932 MW, it is one of the largest pumped-storage power stations in the world, and the largest in Japan. The facility is currently run by the Kansai Electric Power Company.

Like most pumped-storage facilities, the power station utilizes two reservoirs, releasing and pumping as the demand rises and falls. Construction on the facility began in 1970 and was completed in 1974.

Kurokawa Reservoir
The Kurokawa Reservoir, the upper reservoir, has a capacity of 33387000 m3, a catchment area of 1090000 m2, and a reservoir surface area of 5.2 km2, and is held back by the Kurokawa Dam 黒川ダム.

The embankment dam, located on the Ichi River, measures 98 m tall, 325 m wide, and is built with 3650000 m3 of material. The dam is located at 35.2375°N, 134.88111°W.

Tataragi Reservoir
The Tataragi Reservoir, the lower reservoir, has a capacity of 19440000 m3, a catchment area of 1050000 m2, and a reservoir surface area of 13.4 km2, and is held back by the Tataragi Dam 多々良木ダム.

The dam measures 64.5 m tall, 278 m wide, and is built with 1462000 m3 of material. The dam is located at 35.23694°N, 134.83194°W.