The Hatanagi-I (畑薙第一ダム Hatanagi dai-ichi damu) is a dam on the Ōi River in Aoi-ku Shizuoka Shizuoka Prefecture on the island of Honshū Japan. With a height of 125 metres (410 ft) it is the tallest hollow-core concrete gravity dam in the world. It has a hydroelectric power generating station owned by the Chubu Electric Power Company. It supports a 137 MW pumped-storage hydroelectric power station.
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