Malaysia's state-owned utility Tenaga Nasional Berhad (TNB) has commissioned the 100 MW/400 MWh Santong battery energy storage system (BESS), marking the country's first utility-scale BESS directly integrated into the national grid, POWERLINE reports. Unlike other storage conferences, proceeds from the event help to fund high quality journalism across our media titles. TNB chairman Tan Sri Abdul Razak Abdul Majid said the. DUNGUN: The Santong battery energy storage system (BESS) project, with a capacity of 100MW/400MWh and developed by Tenaga Nasional Berhad (TNB), marks a significant step in strengthening electricity grid stability and supporting Malaysia's energy transition agenda, says Datuk Seri Fadillah Yusof.