Swiss-based energy company MET Group has officially inaugurated Hungary's largest standalone battery energy storage system (BESS) at its Dunamenti Power Station in Százhalombatta, located close to Budapest. It is the latest example in a series of. . Hungary joins its neighbours in scaling up grid-scale battery storage, installing the country's largest BESS to date. The new facility supports a growing push to green Hungary's power grid. Operation has started at the storage system. The investment is supported. . With a nominal output of 40 MW and a storage capacity of 80 MWh, the facility marks the latest in a series of energy storage investments by MET Group across Europe.