Japanese firm launches CEE's first sodium-sulfur battery storage system

The groundbreaking 500 kW NAS battery-based energy storage system (ESS) has been successfully put into operation at windows, doors and blinds manufacturer Rollplast’s plant in Kostinbrod, 15km from Sofia, west Bulgaria.  At the Kostinbrod plant, two containerized units have been deployed and the NAS system in integrated with rooftop