There is no obvious winner, so it would need closer investigation.

the pros for carbon emission:
- In a big coal plant you have (a lot) less useless heat generated than in car engines.
- Electricity is (a lot) more efficient than gasoline to produce movement.

the cons:
- Charging batteries is inefficient (maybe less with those fancy batteries mentioned before)
- There is more carbon in coal than in gasoline.


It will be a lot cleaner without all those combustion engines driving in the cities, thats for sure.