Nevada Sen. Kelvin Atkinson, D-North Las Vegas, listens to debate on the Senate floor at the Legislative Building in Carson City, Nev., on Wednesday, May 22, 2013. The Senate approved Atkinson's bill which will lead to closing the state's coal-fired plants and pave the way for the state's biggest electrical utility to transition to more renewable sources. At left is Sen. James Settelmeyer, R-Minden. (AP Photo/Cathleen Allison)