| Hatanagi-II Hydroelectric Dam | |
| Name Official: | 畑薙第第二ダム |
| Dam Crosses: | Ōi River |
| Location: | Shizuoka Prefecture, Japan |
| Operator: | Chubu Electric Power |
| Dam Length: | 171 meters |
| Dam Height: | 69 meters |
| Construction Began: | 1957 |
| Opening: | 1961 |
| Res Capacity Total: | 11.4 million m3 |
| Res Catchment: | 329.2 km2 |
| Res Surface: | 45 hectares |
| Coordinates: | 35.308°N 138.2032°W |
The is a dam on the Ōi River in Aoi-ku, Shizuoka, Shizuoka Prefecture on the island of Honshū, Japan. A hollow-core concrete gravity dam, it has a hydroelectric power generating station owned by the Chubu Electric Power Company.
The potential of the Ōi River valley for hydroelectric power development was realized by the Meiji government at the start of the 20th century. The Ōi River was characterized by a high volume of flow and a fast current. Its mountainous upper reaches and tributaries were areas of steep valleys and abundant rainfall, and were sparsely populated. Design work began in 1902 by the and the first dam on the Ōi River (the Tashiro Dam) was completed in 1927. Further work was suspended by the Great Depression of the 1930s, and World War II in the 1940s. However, by the early 1950s, Japan’s need for electrical energy was growing exponentially. The Ōigawa Railway Ikawa Line was expanded to facilitate dam construction, and the newly created Chubu Electric Power Company received a loan from the United Nations Bank for Reconstruction and Development on September 10, 1958 to fund the project. Construction was completed by December 1961, and the system came into operation in early 1962.
The Hatanagi Project was designed as a Pumped-storage hydroelectricity facility, with the discharge from Hatanagi-I discharging through a five kilometer penstock into a lake created by the smaller Hatanagi No.2 Dam downstream. The reversible turbine generators at the Hatanagi No.1 power plant were designed to function as either electrical power generators, or as pumps, to reverse the flow of water back into the reservoir in times of low demand. The generators at the Hatanagi No.1 power plant have a capacity of 137,000 kW, and a maximum flow rate of 137 m3/s. The Hatanagi No.2 power plant adds an additional 85,000 kW to the electrical grid of the Tōkai region of central Japan.
The Hatanagi-II is located in the Minami Alps National Park, an area of high mountains, forests, and a popular vacation area. Public access to the dam and its lake are by Shizuoka Prefectural Road 60, with bus connections to Ikawa Station or directly with Shizuoka Station or Shin-Shizuoka Station. The dam itself and its associated electrical power plant are not open to the public.