Miranda Ballentine greets vendors during the unveiling of the first federal facility to replace its entire general-purpose fleet with plug-in electric vehicles Nov. 14, 2014, at Los Angeles Air Force Base in El Segundo, Calif. The base's electric vehicle fleet, consisting of 42 vehicles, including sedans, pick-up trucks and mini vans, of which 36 will be vehicle-to-grid capable, is the largest operational V2G demonstration in the world. Ballentine is the assistant secretary of the Air Force for installations, environment and energy. (U.S. Air Force photo/Sarah Corrice)

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Photo by: SARAH CORRICE |  VIRIN: 141114-F-HW403-024.JPG