COMMERCIAL IMAGE - In this photograph taken by AP Images for S&C Electric Company, U.S. Department of Energy Assistant Secretary Patricia Hoffman addresses the crowd gathered to watch the installation... more 
COMMERCIAL IMAGE - In this photograph taken by AP Images for S&C Electric Company, U.S. Department of Energy Assistant Secretary Patricia Hoffman addresses the crowd gathered to watch the installation of the S&C IntelliRupter Pulsecloser, shown in background, on Tuesday, April 24, 2012 in a residential neighborhood in the Chattanooga, Tenn., area. (Christopher Berkey/AP Images for S&C Electric Company) less 
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Associated Press
Tue, Apr 24, 2012 3:08 PM EDT