A staff member of Wuchuan Power Supply Bureau observes the thickness of ice covered on the supply line in Wuchuan Gelao and Miao Autonomous County, southwest China's Guizhou Province, Jan. 9, 2018. According to China Southern Power Grid Guizhou Bureau, 256 on-line alert terminal devices were launched to make sure the stable operation of power supply, since they issued a blue alert for ice weather on Jan. 6. (Xinhua/Tao Liang)