COMMERCIAL IMAGE - In this photograph taken by AP Images for S&C Electric Company, S&C Electric Company CEO John Estey, center, and EPB CEO Harold DePriest, right, talk with EPB technicians before ... more 
COMMERCIAL IMAGE - In this photograph taken by AP Images for S&C Electric Company, S&C Electric Company CEO John Estey, center, and EPB CEO Harold DePriest, right, talk with EPB technicians before installing an S&C IntelliRupter Pulsecloser on the smart grid in Chattanooga, Tenn., on Tuesday April 24, 2012. This last piece of equipment marks a milestone for the city's electric grid, the most automated of its size in the U.S. (Christopher Berkey/AP Images for S&C Electric Company) less 
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Associated Press
Tue, Apr 24, 2012 3:06 PM EDT