Power System Operation Corporation Limited (POSOCO) is a wholly owned Government of India Enterprise under the Ministry of Power. It was earlier a wholly owned subsidiary of Power Grid Corporation of India Limited (PGCIL). It was formed in March 2009 to handle the power management functions of PGCIL. It is responsible to ensure the integrated operation of the Grid in a reliable, efficient, and secure manner. It consists of 5 Regional Load Despatch Centres and a National Load Despatch Centre (NLDC).
The subsidiary was eventually made a separate company in January 2017, leaving the parent firm with only the task of setting up transmission links. The load despatch functions, earlier handled by PGCIL, have now come up to POSOCO.