Photo taken on July 27, 2017 shows the construction site of Baihetan project, which is located downstream of the Jinsha River, the upper section of the Yangtze, in Ningnan county of southwest China's Sichuan Province and Qiaojia county of neighboring Yunnan Province. Building work on what will be the world's second largest hydropower station started on Aug. 3, 2017. (Xinhua)
