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RWE Breaks Ground on Germany’s Largest Grid Battery at Former Gundremmingen Nuclear Site

The project repurposes the decommissioned plant’s grid connection to deliver short‑duration flexibility for Bavaria’s power system.

Overview

  • RWE launched construction with a ceremonial groundbreaking, sizing the storage at 400 MW and 700 MWh with nearly two hours of discharge at full power.
  • More than 200 container units holding about 850,000 lithium‑iron‑phosphate cells will be installed in the coming months, with commissioning targeted for early 2028.
  • The company will use the existing grid connection from the retired nuclear plant to speed integration and support system stability.
  • RWE plans a 55‑hectare solar park at the site expected to generate up to 70 million kWh a year, with construction slated to start next year.
  • RWE’s CEO said the company received approval on Tuesday to build a new gas‑fired peaking plant at Gundremmingen to cover periods of low wind and solar output.