Hydrogen/Oxygen fuel cells will be the way to go once they setup some electrolysis stations until something better comes along in 10 years.
Either have each station be self maintaining using solar panels for the most part, or do it more practically and build some nuclear power plants to power the electrolysis machines. Logically there isn't enough physical room for solar/wind to provide enough energy even with huge farms running at optimal efficiency. Slap down 1 nuclear plant and bingo problem solved. The current US nuclear plants are barely running above 70% output now. It is considerably greener, very safe, and make very very very large outputs.
So fission-->electrolysis-->fuel cell-->battery bank-->EV Vehicle-->water