Kolkata Metro Railway (KMR) introduced India’s first battery backup system as it commissioned a Battery Energy Storage System (BESS) on the underground stretch of the Blue Line. 

To enhance operational resilience, KMR has deployed a 4 MW/6.4 MWh battery energy storage. As per reports, the stored power can move stranded trains at speeds of up to 55 kmph from mid-tunnel to the next station in case of a power failure.