Should electric cars be charged by the hour or the kilowatt-hour?

Dave Solomon’s weekly energy-related column in the Union-Leader points out that the state is trying to decide whether to change the way electric vehicles are charged:

Electric car owners have complained that they are overpaying at EV stations that charge an hourly or per-minute rate for use of the machine. One of the reasons is that the owners of stations are not allowed to charge their customers by the volume of electricity sold, or kilowatt hours. That would put them in violation of current PUC rules that forbid retail electricity customers from reselling electricity to a third party.