It depends on how the electricity is generated of course.
If you are asking about if we are just moving from a tailpipe to a smoke-stack, if you watched "Who killed the Electric Car" the EV1, even if charged using the dirtiest coal generating plant in the U.S., it would have created half the emissions. This is due to a number of factors including the inefficiency of the combustion engine. But I'm not happy with half. If I was happy with half, I'd consider a hybrid.
If I get this bike, I'll likely buy a windmill to power it:
http://www.canadiantire.ca/browse/pr...romSearch=true
but only because that is so much cheaper in the long run than continuing to buy from Bullfrog.