President Barack Obama, center, listens to Jeffrey Martin, CEO of Sempra U.S. Gas & Power during a tour at Sempra's Copper Mountain Solar 1 facility in Boulder City, Nev.,Wednesday, March, 21, 2012. ... more 
President Barack Obama, center, listens to Jeffrey Martin, CEO of Sempra U.S. Gas & Power during a tour at Sempra's Copper Mountain Solar 1 facility in Boulder City, Nev.,Wednesday, March, 21, 2012. Walking behind them are company official John Sowers and Kevin Gillespie.(AP Photo/Pablo Martinez Monsivais) less 
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Associated Press | Photo By Pablo Martinez Monsivais
Wed, Mar 21, 2012 5:49 PM EDT