RWE said it has started construction of Germany’s largest battery energy storage facility at its Gundremmingen site in Bavaria, marking a key step in the company’s strategy to expand energy storage capacity and support the country’s renewable power integration.
The €230 million project will deliver 400 megawatts (MW) of power and 700 megawatt-hours (MWh) of storage capacity, using the existing grid connection of the former Gundremmingen nuclear power plant, which is currently being decommissioned.
RWE said the system will be able to supply electricity continuously for almost two hours, using more than 200 containers housing about 850,000 lithium iron phosphate battery cells. The installation will include 100 ultra-fast inverters to enable near-instant response to fluctuations in the electricity grid.
Commercial operation is expected to begin in early 2028.
Bavarian Minister-President Markus Söder welcomed the project, saying, “Gundremmingen remains a key location in the Bavarian energy supply. With an output of 400MW and a capacity of over 700MWh, the battery storage facility will stabilise the grid when there is no wind or sunlight.”
RWE Chief Executive Markus Krebber said the project highlights the company’s commitment to energy system transformation. “The energy system of the future requires powerful storage facilities. By building Germany’s largest battery storage facility in Bavaria, we are sending a strong signal,” he said.
RWE currently operates 1.2 gigawatts (GW) of battery storage capacity across the United States, Europe and Australia, with an additional 2.7 GW under construction. The company said it plans to continue expanding its global storage portfolio as part of its long-term energy transition strategy.
