Because of following points there is necessity of transmission of power:
1. Electrical load on power system is not concentrated at one place but it is widely spread.
2. Load points are located away from generating station.
3. Due to limitation of site selection criteria of major generating Station (HPP, TPP & NPP) are located far away from load centers and hence the electricity need to transmit from generating stations to the point of actual utilization of it (consumers) for this purpose transmission electricity is necessary.