Switzerland builds most powerful redox-flow battery (swissinfo.ch)

Switzerland’s FlexBase is excavating a site in Laufenburg, Aargau for what it says will be the world’s most powerful redox-flow battery, with plans to inject or absorb up to 1.2 GW within milliseconds. The privately financed project, expected to start operating in 2029, is intended to store renewable energy and help stabilise the Swiss and European grids, with Swissgrid planning a connection for the first time in Switzerland. While supporters cite growing need for flexibility as wind and solar fluctuate, ETH Zurich energy researcher Tobias Schmidt questioned the technology’s prospects, arguing lithium- and other metal-ion batteries may progress faster and become cheaper.