Switzerland Develops World's Largest Underground Redox Flow Battery
The underground redox flow battery in Laufenburg, Switzerland, is projected to exceed 2.1 GWh capacity and 1.2 GW output. This initiative represents a significant advance in energy storage technology, critical for integrating renewable energy and supporting demand from data centers.
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In Laufenburg, Switzerland, construction is underway for the world's largest underground redox flow battery, with a capacity expected to surpass 2.1 GWh and a power output of over 1.2 GW. This facility, developed by FlexBase, incorporates a data center cooled by water, aimed at supporting the electric grid of the future.
The project began in spring 2025 and has received approval for an initial 800 MW grid connection from Swissgrid in January 2026. The strategic location enhances its role in European energy flow management.
The technology employs vanadium in the electrolytes, providing safety advantages over lithium batteries. The project, estimated to cost between 1 and 5 billion Swiss francs, is expected to create hundreds of jobs and mitigate CO2 emissions through heat recovery systems.
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