Griddy takes disruption to another 'multilevel' FacebookTwitterEmail Griddy, the California-based wholesale power retailer, entered the Houston market with its daring billboards.Karen Warren, Houston Chronicle / Staff photographer Griddy, the California-based startup that opened the wholesale electricity market to Texas consumers three years ago, is taking a page from some of its more traditional competitors and will sell power through commission-based networks. NRG Energy and Vistra, the two biggest power sellers in Texas, recently invested millions of dollars buying companies that rely on m...