(i) the utility has been unable to obtain access to the meter;

(ii) circumstances beyond the control of the utility made obtaining an actual reading of the meter extremely difficult, despite having access to the meter area; provided, however, that estimated bills for this reason may be rendered no more than twice consecutively without the utility advising the customer in writing of the specific circumstances and the customer's obligation to have the circumstances corrected;

(iii) the utility has good cause for believing that an actual reading obtained is likely to be wrong; provided, however, that estimated bills for this reason may be rendered no more than once without the utility taking corrective action before the rendering of the next cycle bill;

(iv) circumstances beyond the control of the utility prevented the utility from obtaining an actual reading;

(v) an actual reading was lost or destroyed; provided, however, that an estimated bill for this reason may be rendered no more than once without the utility taking corrective action;

(vi) an estimated reading has been ordered or authorized by the commission for a particular billing cycle;

(vii) an estimated reading has been approved as the billing method consistent with the utility's tariff for the billing period; or

(viii) an unmetered condition was in existence during the period.

(i) the first notice must advise the access controller that the utility will arrange a special appointment to read the meter if the access controller calls a specified telephone number. Where the access controller is not the customer of the subject account, the notice must begin by stating that the utility records indicate that the recipient is the party who controls access to the meter of the customer, specifically identified as to address, part supplied, and account number, and that the utility has not been provided access to the customer's meter as required;

(ii) the second notice must advise the access controller that unless access to the customer's meter is provided on the next meter reading date or a special appointment to read the meter is made and kept by the access controller before that date, a no access charge will be added to the access controller's next bill and to every bill thereafter until access to the customer's meter is provided, but that no charge will be imposed if an appointment is arranged and kept. The notice must advise the access controller that the utility will arrange a special appointment for a reading of the customer's meter if the access controller calls a specified telephone number;

(iii) the third notice must advise the access controller of the no access charge that has been added to the access controller's bill and that unless access to the customer's meter is provided on the next meter reading date or a special appointment to read the meter is made and kept by the access controller before that date, another charge will be added to the access controller's next bill. The notice must advise the access controller that the utility will arrange a special appointment for a reading of the customer's meter if the access controller calls a specified number; and

(iv) the fourth and each successive notice must advise the access controller of the no access charge that has been added to the access controller's bill.