We held a Rethink Energy webinar this week entitled “Can Lithium-Ion batteries play in 10 hour capacity markets, or do we need another technology?” The upshot was broad agreement about the way the markets would move from their frequency response beginnings, through to lulls in intermittent supply today lasting around 4 hours today. The experts we assembled were Marek Kubik of Fluence, a lithium ion whole system provider; Charlie Blair, CEO of UK based mechanical storage outfit Gravitricity; Stefan Schauss, from Enerox, an Austrian based Vanadium flow provider, and Maximilian Schumacher, who represents Siemens Gamesa, which has a thermal “hot rocks” heat storage system. There seemed to be quite a lot of consensus among the four experts on what the…