Every story needs a villain, and this winter, energy companies have conveniently provided the cloak-swirling, mask-wearing baddies that every politician and paper loves to hate. Never mind the distinctions between energy retailer and distributor, or between poor service and Acts of God. Ever since Ed Miliband took to the podium at the Labour party conference in September, energy companies have been public enemy number one, so it was no surprise that when storms hit over Christmas, Westminster and Fleet Street turned on the DNOs.