Hokkaido, Japan, has deployed one of the world's largest flow battery systems to store renewable energy from wind and solar. Hokkaido's flow battery project, spearheaded by Sumitomo Electric, consists of 130 massive tanks, each holding 10,000 gallons of vanadium-infused liquid. . Discover what VRFBs are and how they work. Discover the key benefits, including their long lifespan, scalability and safety features. Explore our range of VRFB solutions, designed to provide flexible options for power and capacity to meet diverse energy storage needs. An Introduction to Flow Batteries 1. What is a Flow Battery? What is a flow battery? A flow battery is an electrochemical cell that converts chemical energy into electrical energy as a result of ion exchange across. . Sumitomo Electric has operated a 2 MW/8 MWh pilot vanadium flow battery in San Diego since December 2018 and is constructing a similarly sized facility on the island of Kyushu. The company said last week (28 March) that it had received an order for a grid-scale 2MW/8MWh VRFB from Shin-Idemitsu (IDEX).