A utility company wants to promote the increased use of electric vehicles in its service area by offering significantly reduced electricity rates for nighttime recharging of vehicle battery. Each electric vehicle (EV) is given a unique id which is keyed to the customer so that the utility’s billing system can bill the customer under the reduced EV charging rates. The system also permits the customer to use the charging station at another customer’s site [such as at a friend’s house] and have the system bill the vehicle owner instead of the customer whose charging station is used.
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