Three years ago, when GE and Italian utility A2A resurrected a mothballed power plant in Chivasso, they also created a roadmap for how older plants could be made over to emit fewer greenhouse gases and become more competitive players in the energy market. Now the lessons of Chivasso’s extreme makeover have been extended to A2A’s other decades-old power generators in Northern Italy: two gas-powered plants in Cassano and Sermide.