Cuomo, a Democrat, directed state energy officials to create a plan to produce 50 percent of its power from renewable sources by 2030. While he's pushing for big investments in wind and solar energy, he argues that nuclear power should serve as a "bridge" as the state ramps up its use of solar and wind energy, which, along with other renewable sources, now generate about a quarter of the state's energy. Jessica Azulay, of the Alliance for a Green Economy, said that money should be invested in renewable sources, or in efforts to help communities with nuclear plants find new economic engines. Complicating the fight over nuclear power and the offshore wind proposal are older debates about jobs, energy costs and fossil fuels like natural gas and coal. Exelon Corp.