NTPC Vidyut Vyapar Nigam (NVVN) has invited bids to set up a 250 MW/500 MWh standalone battery energy storage system (BESS) in Kerala. The BESS installation will be at the 220 kV Brahmapuram substation in Kochi, Kerala with an interconnection at the 220 kV voltage level within the jurisdiction of Kerala State Electricity Board (KSEBL).