RWE has officially begun construction of Germany’s largest battery storage facility at its Gundremmingen site in Bavaria. The facility will feature 400MW of power output and a storage capacity of 700 megawatt-hours, utilising the existing grid infrastructure from the now-decommissioned Gundremmingen nuclear power plant.
The project, involving an investment of around €230m ($266.98m), aims to stabilise the power grid by storing surplus electricity generated from solar and wind and supplying it during periods of low renewable output.
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In addition to the battery storage system, RWE plans to develop a 55-hectare solar park that is expected to generate up to 70 million kilowatt-hours annually. To complement the renewables, a gas-fired peaking power plant is also planned to provide backup power during demand peaks or when renewable generation dips.
This state-of-the-art battery facility will house more than 200 containers of lithium-iron phosphate battery cells and utilise ultra-fast inverters, enabling rapid response times to supply or absorb electricity within milliseconds, which is crucial for grid stability. Commercial operations are scheduled to begin in early 2028.
The project is part of RWE’s broader commitment to repurposing former nuclear sites for renewable energy and storage solutions, supporting Germany’s transition away from nuclear and fossil fuels towards a cleaner, more flexible energy system.
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