India is now amongst the fastest developing countries in the world in terms of GDP as well as the electricity consumption. The challenge is to meet the energy needs of high economic growth & electricity consumption of about 1.3 billion people. The development of an efficient, coordinated, economical and robust electricity system is essential for smooth flow of electricity from generating station to load centers (as per Electricity Act, 2003) and for optimum utilization of resources in the country, in order to provide reliable, affordable, un-interruptible (24x7) and Quality Power for All. Transmission system establishes the link between source of generation on one side and distribution system, which is connected to load / ultimate consumer, on the other side. Transmission planning is a continuous process of identification of transmission system addition requirements, their timing and need.