In the U.S., the cost of electricity varies far more than the cost of gasoline, from a kilowatt-hour average of 8.6 cents in Washington state to 37 cents in Hawaii. (A kilowatt-hour [kWh] is the amount of electrical energy consumed when 1,000 watts are used for one hour.) Depending on the availability of public charging, you might be able to recharge your electric vehicle (EV) for free during a lunch stop at the mall. But if the EV is going to be filled up at home, your rate could be much higher than the national average of 12 cents that the EPA uses on its fuel economy label for EVs.
Link: https://www.edmunds.com/fuel-economy/the-true-cost-of-powering-an-electric-car.html