Hungary's largest operating standalone battery energy storage system (BESS) has been inaugurated today: MET Group put into operation a battery electricity storage plant with total nominal power output of 40 MW and storage capacity of 80 MWh (2-hour cycle). It is the latest example in a series of. . Hungary has just switched on its largest battery energy storage system (BESS) to date, stepping up its role in Central Europe's growing grid-scale energy transition. Located near Budapest at the Dunamenti Power Station in Százhalombatta, the 40 MW / 80 MWh facility marks a crucial development in Hungary's. . On-site at the Dunamenti Power Station in Százhalombatta, MET already installed a 4 MW / 8 MWh demonstrator plant based on Tesla Megapack 2 batteries in 2022. The company said it is the largest BESS in Hungary.