Indianapolis Mayor Greg Ballard is taking the city’s fleet green – all of its light-duty non-police vehicles will be either battery or plug-in hybrid by 2025, and heavy fleet vehicles will be switching over to compressed natural gas. He’d also like to see automakers offer plug-in police cars, too. “The United States’ current transportation energy model, driven by oil, exacts an enormous cost financially and in terms of strategic leverage,” Ballard said in a speech.