The U.S. Department of Energy’s Alternative Fuels Data Center online tool calculates the number of chargers needed in a state or region in hypothetical scenarios.
Assume just 10% of 2016’s light-vehicle population in a metropolitan area is replaced with electrified vehicles and the mix is:
PHEV, 20-mile electric range: 15%
PHEV, 50-mile electric range: 35%
Full-electric vehicle, 100-mile range: 15%
Full-electric vehicle, 250-mile range: 35%
And assume most PHEV drivers wouldn’t need to use gasoline on a typical day, and that all drivers have access to home charging. Here is how many plugs would be needed in select metropolitan areas.