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Xiangjiaba Hydropower Project
 

The Xiangjiaba Hydropower Project is the last step of the cascade development on the lower mainstream of Jinsha River, of which Yibin County of Sichuan Province is on the left bank and Shuifu County of Yunnan Province is on the right bank. It is 33km upstream of Yibin City and 2.5km away from Shuifu County. Its linear distances to Yichang, Wuhan, and Shanghai are 700km, 980km, and 1160km respectively. Apart from its main purpose of power generation, the Xiangjiaba Hydropower Project provides multiple benefits of flood control, navigation improvement, and irrigation. It also plays the role of sediment trapping and counter regulation for the Xiluodu Hydropower Project. Once completed, it will supply power mainly to central China and east China as well as to Sichuan and Yunnan Provinces.

The main structures consist of the dam, flood discharge facilities, sand flushing outlets, left-bank dam-toe waterway and power generation system, right-bank underground waterway and power generation system, left-bank vertical ship lift, navigation structures and irrigation intakes. The concrete gravity dam has a crest elevation of 384m, a maximum height of 162m and a crest length of 896.26m. The left-bank dam-toe hydropower station is located to the left of the flood discharge structure and the right-bank underground hydropower station is located in the hill on the right bank. Both are installed with four 750 MW generating units, with a total installed capacity of 6400 MW and an annual power output of 30.747TWh. The vertical ship lift lies to the left of the left-bank dam-toe powerhouse and the navigational structure is designed according to Class IV navigational channel criteria, which is with a maximum lift height of 114.2m, a design annual transport weight of 1.12 million tons, capable of accommodating 2x500 t barge fleets. The irrigation water intakes are located at the non-overflow dam sections on both banks with a total irrigation area of 250,000 ha.

The Xiangjiaba Hydropower Project has a normal storage level of 380m and a dead storage level of 370m. Its reservoir is of partial seasonal regulation with a total storage capacity of 5.163 billion cubic meters and a regulation capacity of 903 million cubic meters. Its preparatory work was commenced in March 2004; its official initiation fell on November 2006; the first batch of generating units is scheduled to be put into commission in 2012; and by 2015 the whole project will be completed to a construction period of 9 years and 6 months. Calculated on basis of the price level in the first quarter of 2006, the static investment of the Xiangjiaba Project is 43.424 billion yuan.