Wind turbines are seen at Yandun Wind Power Base in Hami, northwest China's Xinjiang Uygur Autonomous Region, Sept. 20, 2017. (Xinhua/Cai Zengle)

Wind turbines are seen at Yandun Wind Power Base in Hami, northwest China's Xinjiang Uygur Autonomous Region, Sept. 20, 2017. (Xinhua/Cai Zengle)

Wind turbines are seen at Yandun Wind Power Base in Hami, northwest China's Xinjiang Uygur Autonomous Region, Sept. 20, 2017. (Xinhua/Cai Zengle)