David Meisel, director of transportation for San Francisco-based Pacific Gas & Electric, travels around the country advising state and federal regulators in Sacramento and Washington on many issues with trucks and energy. His other responsibility is running one of the largest combination gas and electric utility fleets in the U.S., a job he has held since 2007. Alternative fuel systems and the changes they bring have evolved as an important transition for the fleet. With the impact of rising fuel costs, PG&E is looking at electrification on vehicles where batteries are used not only to drive the truck but to power hydraulics, provide lighting, heat, air conditioning and external power while the truck is parked.