The is a large pumped-storage

hydroelectric Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and ...

power plant in Toyone, Kitashitara,

Aichi Prefecture is a prefecture of Japan located in the Chūbu region of Honshū. Aichi Prefecture has a population of 7,552,873 () and a geographic area of with a population density of . Aichi Prefecture borders Mie Prefecture to the west, Gifu Prefectur ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. With an installed capacity of , the plant is one of the largest pumped-storage power stations in Japan. The facilities are run by Electric Power Development Company (J-Power). Like most pumped-storage facilities, the power station uses two reservoirs, releasing and pumping as the demand rises and falls. Midori lake, formed by the

Shintoyone Dam The Shintoyone Dam (新豊根ダム) is a multipurpose dam in the village of Toyone in the Aichi Prefecture of Japan. History The potential of the Tenryū River valley for hydroelectric power development was realized by the Meiji government at ...

, is the upper artificial reservoir, while

Sakuma Dam The is a dam on the Tenryū River, located on the border of Toyone, Kitashitara District, Aichi Prefecture on the island of Honshū, Japan. It is one of the tallest dams in Japan and supports a 350 MW hydroelectric power station. Nearby a freq ...

forms the lower reservoir. Shintoyone Dam is a 116.5 m-tall arch dam, while Sakuma Dam is a 155.5 m-tall concrete

gravity dam A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation to oppose the horizontal pressure of water pushing against it. ...

. Sakuma Dam was built between 1953 and 1956 to provide water to the Sakuma conventional hydroelectric power plant. Shintoyone Dam was completed later in 1973 to act as the upper reservoir of the Shintoyone Pumped storage plant. The plant employs five 225 MW pump/generator units, for a total net capacity of 1125 MW. The maximum water flow is 645 cubic meters per second and the effective head is 203 m. The intake elevation is at 474 m over sea level, while the discharge elevation is 260 m over sea level. Construction of the plant started in November 1969 and became operational between November 1972 and October 1973. Sakuma Dam on the lower reservoir also provides water for the and the two conventional hydroelectric power plants. Construction of the first plant started in 1953 and became operational in 1956. The plant employs four 96 MW Francis turbines, for a total capacity of 350 MW. The second plant became operational in 1982. It employs two Kaplan turbines with a combined capacity of 32 MW. The plant uses the residual water drop from the first plant to Tenryū river downstream.

Notes

{{Dams in Aichi Prefecture Pumped-storage hydroelectric power stations in Japan Energy infrastructure completed in 1972 1972 establishments in Japan

See also

Notes