Owners of public electric-vehicle charging stations would do well to bill their customers about a $1 per hour. That's the rate where they can make money but won't make EV drivers feel gouged, according to the Christian Science Monitor reports, citing several members of the EV charging station industry.

Pat Romano, CEO of EV-charging station maker Coulomb Technologies, told the publication that $2 an hour is "expensive," especially given that most EVs charge at a rate of about 3.3 kilowatts per hour – and that much energy usually costs about 50 cents.

The subject is topical because the time of free charging is starting to come to an end. Many states control the utilities that supply the electricity and, therefore, the pricing. Still, California, the most populous U.S. state, recent passed a law that lets owners of charging stations set their own charging rates.

Either way, per-hour pricing may ruffle some feathers because cars like the Tesla Model S and Coda Sedan suck up electricity at about twice the rate of cars like the Nissan Leaf, according to the Monitor.

There are about 12,000 EV charging stations throughout the U.S., with about 4,300 that are publicly accessible, according to the U.S. Department of Energy. Coulomb, which two years ago set a goal to install 4,500 stations throughout the U.S., reported in April that it had shipped more than 2,400 units.

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