At the border between the two provinces of Sichuan and Yunnan in China, the worlds largest underground hydroelectric power project is under construction. The Baihetan HEP will generate 16.000 MW when it starts it production in mid 2021.


The dam will be the worlds second largest concrete dam with its 8,6 million m3 of concrete and the dams height will be 286 m. Underground, the machine halls, headrace- and other tunnels will have a total tunnel length of 130 km.

Swedish Underground Ventilation AB (”SUVAB”) designed the complete scope of the tunnelling ventilation and as of today, a total of 110SWEDFAN tunnelling fans and 150 km of SWEDFAN flexible ducting has been delivered to this project.



The ventilation has been a success and the owner of the project, China power company Three Gorges, has received a technical medal from the government in Beijing for technical progressive innovations for improvements of environment in underground works. 01/18.