Construction is underway on the world’s largest flow battery project at a key cross-border grid hub where Germany, France and Switzerland converge. The project aims to stabilise power flows across national lines, bolstering energy resilience and supporting long-duration renewable integration.
The Laufenburg-based facility – led by FlexBase Group with support from Flow Batteries Europe (FBE) – will provide more than 1.6GWh of storage and 800MW of output. Designed to operate for hours or even days, it avoids the use of critical raw materials, offering a safer, scalable solution for Europe’s energy needs.
“Building an 800MW and 1.6GWh flow-battery is something nobody has ever done before,” said Marcel Aumer, group CEO, VRP and co-founder of FlexBase Group. “Together as a team and with the knowledge of partners like FBE we’re creating a scalable model for managing renewable energy lulls across Europe.”
FBE’s secretary general, Anthony Price, highlighted the importance of regulatory frameworks to support long-duration technologies. German Institute for Economic Research (DIW) research suggests up to 35TWh of such storage may be required to handle extended dips in renewable output.
Insights from the Laufenburg flow battery project and sector developments will be shared at the International Flow Battery Forum in Vienna, taking place 24–27 June 2025.
Image: Flow batteries leaders meeting in Laufenburg, Switzerland, with participants from the FlexBase Group and Flow Batteries Europe. From left to right: Juergen Wieshoff (FBE), Sascha Berthold (FlexBase), Kees van de Kerk (FBE President), Pascal Wyss (FlexBase), Marcel Aumer (FlexBase) and Anthony Price (FBE Secretary General)
