Portland is one of six markets where the Triple-A is testing a new roadside assistance truck for owners of electric cars.  It’s equipped with a compressed natural gas powered generator to re-charge electric vehicles when they run out of power. And it only takes about 15 minutes for a charge.   That's enough for the driver to get to a charging station.  Because of the high voltage produced by the generator; they have to use special grounding on the truck, and they extra careful when it's raining.