A supplier may drop a customer by sending an electronic drop transaction to the utility. Drop Effective Date. Except as provided under §B(2) of this regulation, a supplier drop is effective on the first day of the next month. A drop received by a utility less than 7 days before the first day of the next month shall take effect on the first day of the next subsequent month. A utility shall assign a customer who has been dropped by a supplier and not enrolled by a supplier to sales service.