A quest to prove there’s a business case for installing big batteries at buildings  Ucilia Wang California is set to become a large energy storage market, and that has prompted bankers to figure out whether they could make money from it. Wells Fargo ... GigaOMhttp://gigaom.com/2013/09/18/a-quest-to-prove-theres-a-business-case-for-installing-big-batteries-at-buildings/