The election by a utility to have the terms of this article apply to its rates and charges for gas distribution service once made shall remain in effect until the next § 58-5-240 general rate proceeding for the public utility at which time the public utility may then elect to continue the applicability of this article to its rates and charges or elect to opt out of the provisions of this article. The applicant may withdraw its request to come under the terms of this article at any time before the entry of a final order of the commission on the merits of the proceeding in which the election is made or on a petition for rehearing in the proceeding.