Most of the biggest names in the U.S. demand response industry — EnerNoc, Comverge, and CPower — have been acquired, merged or reconfigured in some way over the past decade, as they’ve shifted or struggled to adapt to the vagaries of the market they helped to create. Last year saw the last publicly traded pure-play demand response provider, EnerNOC, bought by Italy’s Enel for $250 million. It also saw smart meter and networking provider Itron paying private equity firm H.I.G. $100 million for residential DR provider Comverge, which it took private for $49 million in 2010.