Jinping-II Hydroelectric Project is located on the large Jinping River Bend, and is the second of the five cascade projects on the river section from Kala down to the estuary.
Jinping-II is designed to cut the 150km river bend by a group of power tunnels to use the natural drop created by the bend. The project primarily consists of a headwork sluice dam, spillway structures, power tunnels and powerhouse complex.
The dam is 7.5km downstream of Jinping-I dam. The catchment area upstream of the dam is 103,000km2, and the multi-year average inflow at the dam site is 1,220m3/s. Jinping-II reservoir itself only has a capacity of daily regulation, but when jointly operated with Jinping-I, it also has the capacity of yearly regulation.
The 4 power tunnels have an average length of 16.6km and an excavated diameter of 13m, which are among the world¡¯s longest and largest hydraulic tunnels.
The powerhouse complex sits underground on the other side of the river bend.
The project has a total installed capacity of 4,800MW (8 ¡Á 600MW), which gives a multi-year average annual generation of 24.23TWh.
Total construction period of the project is 8 years and 3 months, and its total static investment is RMB24.98 billion yuan, while the total dynamic investment is RMB29.77 billion yuan.