Construction has started on what is being called the world’s largest flow battery—an 800-megawatt (MW) / 1.6-gigawatt-hour (GWh) project in Laufenburg, Switzerland. Flow Batteries Europe (FBE), a non-profit industry association, confirmed the news on Tuesday. The project officially launched in May, marked by a meeting of leaders from FBE and the FlexBase Group in Laufenburg.
The redox flow battery system is part of a larger project led by FlexBase and the Laufenburg Technology Centre. The site will also house an artificial intelligence data center.
The battery facility is located at a key grid interconnection point where Germany, France, and Switzerland meet. Once completed, it will help balance electricity supply and demand across borders. It will store renewable energy—such as wind and solar—for hours or even days, providing backup power during periods of low generation.
“Building an 800 MW and 1.6 GWh flow battery is something no one has ever done before,” said Marcel Aumer, CEO and Co-founder of FlexBase Group.
Anthony Price, Secretary General of Flow Batteries Europe, highlighted the importance of supportive regulations for long-duration energy storage. He noted that flow batteries not only offer extended storage times but also have safety and environmental advantages.
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