A transmission line is the channel or medium through which the transmission and distribution of electric power occurs. It consists of a metal structure that acts as a support for electrical conductors through which energy is transmitted over long distances.
Electrical transmission lines are high voltage and, along with substations, they make up the electric transport network. Energy supply is still possible through them even if there is some incident in the transmission process; this is because the energy can get there from another line that the system is interconnected with.