The chart on the left shows CO2 emissions by gas-electric plug-in hybrids depending on the electricity source. As you can see, plug-ins beat the conventional gasoline-powered vehicle at the top in all situations, but the comparison with a regular hybrid vehicle is more complex. Depending on the power source, it can go from slightly worse than the hybrid to about twice as good (and three times as good as the conventional car).
Not surprisingly, coal without carbon capture is the worst power source, and even "advanced coal burning" isn't much better. And as the source of 43% of U.S. electricity, it must be taken seriously.
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