EWE Gasspeicher, a German gas storage company, is planning to build a giant flow battery big enough to power the whole of Berlin for an hour. The energy industry narrative has up till now focused on the potential of lithium-ion storage and distributed energy through smart grids. This announcement should make those in the sector reconsider the potential of flow battery technology. EWE Gasspeicher plans to build a 700 MWh flow battery in Berlin. The battery will make use of the company’s gas storage assets – which currently uses caverns for gas storage and is looking to install the flow battery into the caverns by 2023. This planned level of storage capacity far overshadows the current largest lithium-ion battery storage…