Power Grid Corporation of India Limited is a transmission company engaged in the power transmission business with responsibility for planning, implementation, operation and maintenance of Inter-State Transmission System and operation of National and Regional Load Dispatch Centers. The Company's segments include Transmission, Telecom and Consultancy. The Transmission segment includes extra high voltage/high voltage (EHV/HV) networks and grid management. It also owns EHV alternating current (AC) and HV direct current (HVDC) sub-stations. The Consultancy segment includes planning, design, engineering, load dispatch, procurement management, operation and maintenance, financing and project management. The Telecom segment includes transmission infrastructure, enterprise services and topologies. It owns and operates over 129,350 circuit kilometers of EHV transmission lines. It has approximately 210 sub-stations. Its Smart Grid enables real time monitoring and control of power system.