Well, if the thing is 100% electric powered, and you produce that electricity in a nuclear plant, then the thing contributes zero emissions.
Unfortunately, the same greenies who've tried shoving electro-mobiles down our throats have also been instrumental in putting the clamp on more nuclear power. Chances are only a small percentage of the power used the charge the batteries was from nuclear. That's not including the power used for, and the waste generated by, manufacturing battery packs which contain a cornucopia of nasties.
Brad