In this photo provided by the Georgia Port Authority, a GPA electric rubber-tire gantry crane works off a new electric grid system at the Savannah Port Friday, December 14, 2012, in

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In this photo provided by the Georgia Port Authority, a GPA electric rubber-tire gantry crane works off a new electric grid system at the Savannah Port Friday, December 14, 2012, in Savannah, Ga. The cranes can switch from shore-based power on the grid, to on-board diesel generators when moving between stacks. According to the GPA, the new technology reduces fuel consumption by an estimated 95 percent. (AP Photo/Georgia Port Authority, Stephen Morton) less 

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Associated Press
Fri, Dec 14, 2012 8:44 PM EST