(A) Within thirty days after the date of issuance of an order approving an exemption or alternative rate plan under section 4929.04 or 4929.05 of the Revised Code or within twenty days after the issuance of a rehearing entry pursuant to section 4903.10 of the Revised Code, whichever is later, the natural gas company shall do either of the following:

1. (1) File with the public utilities commission a notice of its intention to implement the exemption or alternative rate plan as directed by the commission in its order, and a copy of its revised rate schedules;
2. (2) Withdraw its exemption application or alternative rate plan request if the commission modifies or does not approve as filed the exemption application or the alternative rate plan request.

(B) If a natural gas company files a notice and revised schedules pursuant to division (A)(1) of this section, the commission, within thirty days after the date of the filing, shall do either of the following:

1. (1) Approve the revised schedules if the commission finds that there is no material difference between the approved alternative rate plan and the filed schedules;
2. (2) Disapprove the revised schedules if the commission finds that there is a material difference between the approved alternative rate plan and the filed revised schedules. If the commission disapproves the revised schedules, it shall provide a written order explaining its reasons for doing so, and it shall permit the company an additional thirty days to file revised rate schedules to implement the approved alternative rate plan or permit the company to withdraw the alternative rate plan pursuant to division (A)(2) of this section.