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Of course, with electricity demand falling â thanks in large part to the popularity of rooftop solar â power companies are using the fixed cost components of their billing systems to help cover their own fixed costs, while also compensating for lower usage by consumers.
On the other hand, electric vehicle charging costs are not nearly as clear. 1  Some EV charging stations require payment by the hour, dispensing however much energy the car can take during that time. 2  Others charge by the mysterious kilowatt-hour. 3  There are charging stations that use a per session fee.