Are plug-in hybrid vehicles green?

The Velozzi plug-in multifuel hybrid electric vehicle

X-Prize contender, the Velozzi plug-in hybrid, is a series plug-in hybrid that, in theory, will achieve 100-200 mpg. Like the Chevy Volt, the Velozzi runs on electricity, and can also use any heavy fuel to generate electricity. Unlike the Volt, however, the Velozzi isn't intended to be a heavy fuel-range extended electric vehicle. Velozzi would prefer that biofuels were used to generate your vehicle's electricity, rather than grid electricity - unless a significant percentage of the grid electricity is NOT powered by coal. Finish....