Technicians inspect the tower of the ±800KV Ultra High Voltage (UHV) transmission line in Wushan County of southwest China's Chongqing, Dec. 6, 2016. The ±800KV UHV transmission line will run 2,383 kilometers from Jiuquan in northwest China's Gansu Province to Xiangtan in central China's Hunan Province. It's so far the longest transmission line of its kind in China.(Xinhua/Liu Chan)