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Copper Mountain

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20120404-223639-pic-707327795.jpg

20120404-223639-pic-707327795.jpg

** FILE ** In this April 4, 2012, file photo, President Obama listens to Jeffrey Martin, the chief executive officer of Sempra U.S. Gas Power, during a tour at the Copper Mountain Solar 1 facility in Boulder City, Nev. John Sowers and Kevin Gillespie also join the tour. (Associated Press)