175.30—Billing.
(a) Metered customers.
The utility shall render bills at monthly intervals unless otherwise provided in special contracts. Bills shall be based on the applicable rate schedule(s). Unless otherwise determined, the amount of energy and/or power demand used by the customer shall be as determined from the register on the utility's meter at the customer's point of delivery. A reasonable estimate of the amount of energy and/or power demand may be made by the utility in the event a meter is found with the seal broken, the utility's meter fails, utility personnel are unable to obtain actual meter registrations, or as otherwise agreed by the customer and the utility. Estimates shall be based on the pattern of the customer's prior consumption, or on an estimate of the customer's electric load where no billing history exists.
(b) Unmetered customers.
Bills shall be determined and rendered as provided in the customer's special contract.
(c) Service fee billing.
The utility shall render service fee bills to the customer(s) as a special billing.