Aerial photo taken on Oct. 23, 2019 shows heliostats of a molten-salt solar thermal power plant in Dunhuang, northwest China's Gansu Province. (Xinhua/Ma Ning)
Workers clean heliostats for a molten-salt solar thermal power plant in Dunhuang, northwest China's Gansu Province. (Xinhua/Ma Ning)
Workers clean heliostats for a molten-salt solar thermal power plant in Dunhuang, northwest China's Gansu Province. (Xinhua/Ma Ning)
Workers clean heliostats for a molten-salt solar thermal power plant in Dunhuang, northwest China's Gansu Province. (Xinhua/Ma Ning)