The sign outside the Public Service Commission hearing room on Dec. 20 said this: “Merry Christmas from the Georgia Public Service Commission.” Inside the hearing room, it was a merry Christmas indeed for one of the state’s biggest corporate entities, the Georgia Power Co. With scarcely enough time for a “Ho-ho-ho,” the five PSC members voted unanimously to give Georgia Power one of the most expensive yuletide gifts an American corporation could receive: an agreement that lets Georgia Power almost completely off the hook for virtually all of its multi-billion-dollar cost overruns on two nuclear reactors at Plant Vogtle.