UPS: Getting Big Brown Machines To Go Green - CNN Money Today, Atlanta-based UPS UPS is experiencing a blast from the past. It again has some electric vehicles carrying packages in various U.S. cities. Diesel-electric hybrids, natural-gas-powered trucks and a slew of other experimental vehicles also cruise city streets and highways. The company's morphing into a leader in using truck fleets powered by alternative fuels. And what it's learning offers pointers for other firms trying to lower costs and environmental impacts by using new vehicle tech.