Cinematic 4K 60 fps. A transmission tower or power tower (alternatively electricity pylon or variations) is a tall structure, usually a steel lattice tower, used to support an overhead power line. An overhead power line is a structure used in electric power transmission and distribution to transmit electrical energy across large distances. It consists of one or more conductors (commonly multiples of three) suspended by towers or poles. Since most of the insulation is provided by air, overhead power lines are generally the lowest-cost method of power transmission for large quantities of electric energy. UHD 3840×2180