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yesterday

RWE Breaks Ground on Germany’s Largest Battery Storage at Gundremmingen

Bavaria’s Gundremmingen site will convert a retired nuclear grid connection into high-capacity storage providing near two-hour output by early 2028.

The two cooling towers of the former Gundremmingen nuclear power plant were blown up successfully.
RWE groundbreaking on its Gundremmingen BESS project, the largest in Germany. Image: RWE.

Overview

  • RWE began construction on October 29 of a 400MW/700MWh battery energy storage system at the decommissioning Gundremmingen nuclear site in Bavaria.
  • The project carries an investment of about €230 million and is engineered for roughly 1.75 hours of discharge at full output.
  • The installation will reuse the nuclear plant’s existing grid connection to help stabilise electricity supply during periods of low wind and solar generation.
  • The system will comprise over 200 container units with around 850,000 lithium iron phosphate cells and about 100 inverters for rapid grid response.
  • Commercial operation is targeted for early 2028, with the facility set to become the largest battery storage asset in Germany, surpassing Eco Stor’s Bollingstedt project.