Photo taken on June 26, 2019 shows the construction site of the Baihetan hydropower project in Ningnan County of Liangshan Yi Autonomous Prefecture, southwest China's Sichuan Province. On the Jinsha River, an upper section of the Yangtze, the Baihetan dam is the second largest after the Three Gorges project in central Hubei Province in terms of installed capacity. (Photo: Xinhua)

Photo taken on June 26, 2019 shows the construction site of the Baihetan hydropower project in Ningnan County of Liangshan Yi Autonomous Prefecture, southwest China's Sichuan Province. On the Jinsha River, an upper section of the Yangtze, the Baihetan dam is the second largest after the Three Gorges project in central Hubei Province in terms of installed capacity. (Photo: Xinhua)

Photo taken on June 26, 2019 shows the million-kilowatt generating unit of the Baihetan hydropower project under construction in Ningnan County of Liangshan Yi Autonomous Prefecture, southwest China's Sichuan Province. On the Jinsha River, an upper section of the Yangtze, the Baihetan dam is the second largest after the Three Gorges project in central Hubei Province in terms of installed capacity. (Photo: Xinhua)

Photo taken on June 26, 2019 shows the million-kilowatt generating unit of the Baihetan hydropower project under construction in Ningnan County of Liangshan Yi Autonomous Prefecture, southwest China's Sichuan Province. On the Jinsha River, an upper section of the Yangtze, the Baihetan dam is the second largest after the Three Gorges project in central Hubei Province in terms of installed capacity. (Photo: Xinhua)

Photo taken on June 26, 2019 shows the construction site of the Baihetan hydropower project in Ningnan County of Liangshan Yi Autonomous Prefecture, southwest China's Sichuan Province. On the Jinsha River, an upper section of the Yangtze, the Baihetan dam is the second largest after the Three Gorges project in central Hubei Province in terms of installed capacity. (Photo: Xinhua)

Photo taken on June 26, 2019 shows the construction site of the Baihetan hydropower project in Ningnan County of Liangshan Yi Autonomous Prefecture, southwest China's Sichuan Province. On the Jinsha River, an upper section of the Yangtze, the Baihetan dam is the second largest after the Three Gorges project in central Hubei Province in terms of installed capacity. (Photo: Xinhua)