Tamil Nadu is upgrading its hydropower projects and adding battery storage to handle growing power demand and improve grid reliability. Tamil Nadu Green Energy Corporation Limited (TNGECL), which runs 47 hydropower stations with 107 machines and 2,325.90 MW installed capacity, has a hydro generation target of 4,776 million units (MU) for 2026-27. Renovation, Modernisation and Uprating (RMU) works are under way at old stations including Moyar and Kodayar. Battery Energy Storage Systems (BESS) of 1,000 MWh at six substations are due by December 2026, with another 1,500 MWh at 11 substations planned for September 2027.