The headrace and power generation structures are arranged on both banks. Five 630 MW units are installed on the left bank, which has a central-type underground powerhouse, and five 630 MW units and two 350 MW units are installed on the right bank, which has a head-type underground powerhouse. The headrace tunnel adopts the structure of “one tunnel for one unit”; and the tailwater tunnel adopts the structure of “one tunnel for two units” and “one tunnel for three units”. The powerhouse, main transformer cavern and surge chamber are arranged in parallel. The headrace and power generation structures are composed of intake, headrace tunnel, main powerhouse, erection bay, main transformer cavern, cable shaft, tailwater tunnel, tailwater surge chamber, tailwater platform, tailrace, access tunnel and converter station, etc.