RWE has successfully commissioned a 220 MW large-scale battery storage system at its Hamm and Neurath sites in Germany. With a total capacity of 235 MWh, the system can reach full output within seconds and sustain it for about an hour, playing a crucial role in stabilizing the electricity grid through balancing energy markets.
The storage system consists of 690 battery cabinets, each housing eight battery modules. The Hamm site, commissioned in December, contributes 140 MW (151 MWh), while the Grevenbroich-Neurath site adds 80 MW (84 MWh). RWE also developed the necessary grid infrastructure, including high-voltage transformers connecting to the 110-kV grid.
RWE Generation SE CEO Nikolaus Valerius emphasized the importance of large-scale energy storage in supporting renewable energy expansion, stating that additional battery projects are already in the pipeline.
Local leaders welcomed the project as a significant step in the energy transition. Hamm’s Lord Mayor Marc Herter highlighted the city’s growing role in green energy supply, while Grevenbroich’s Lord Mayor Klaus Krützen pointed to the battery storage facility as a key driver of structural change in the region.
The availability of suitable sites and strong grid connectivity were key factors in selecting these locations. RWE sees further potential for expansion, particularly in Hamm, where additional large-scale battery storage projects are planned on the site of the former Westfalen hard-coal power plant in Hamm-Uentrop.
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