UK renewable energy company Low Carbon announced today the sale of a 6-GW battery energy storage (BESS) portfolio to S4 Energy, a Dutch grid-scale energy storage developer and operator <a href="https://renewablesnow.com/news/energy-trader-cci-invests-in-dutch-storage-specialist-s4-energy-810623/" target="_blank">majority-owned by</a> global merchant firm Castleton Commodities International (CCI).