1000KV overhead transmission line steel tower An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy along large distances. It consists of one or more conductor (most often three or four) suspended by towers or utility poles. Since most of the insulations is provided by air, overhead power lines are generally the lowest-cost method of power transmission for large quantities of electric energy. Electrical Energy, Electrical Equipment, Transmission Tower, Zhuhai, Qingdao, Electric Power, Conductors, Golden Gate Bridge, Towers