Our first ever interview on Rethink Energy was about CellCube Vanadium Flow batteries with UK distributor Immersa, and we caught up this week with the CEO of Canada’s CellCube, which makes, installs and maintains Vanadium Flow grid scale batteries, who makes it clear that 2020s will be the tipping point for batteries. He later shows a graph from Navigant Research which suggests that long duration energy storage is cumulatively a $92 billion opportunity by 2027 when annually it will be a $23 billion business. CEO Stefan Schauss is an evangelist for the technology and this week the company announced it had a Letter of Intent from Australia’s Pangea Energy, a subsidiary of a South East Asian solar specialist which is…