http://www.renewableenergyworld.com/articles/2015/07/tesla-cto-bulk-energy-storage-will-grow-much-faster-than-people-expect.html?eid=291113142&bid=1122771

Straubel closed with some very aggressive predictions that seem more like a wish list than what may actually take place. “In our view battery costs are going to decline much faster than most people expect.” He believes that in less than 10 years nearly all cars will be electric. Also he said bulk storage with batteries will grow faster than predicted. “Our view is that batteries are really going to win” over other energy storage technologies like pumped hydro, compressed air energy storage, even flow batteries, he said. “We are seeing price declines that make a lot of those technologies somewhat stranded,”