Ohio Rev. Code § 4929.09
In accordance with the commission's order prescribing a separation plan under division (E) of section 4929.04 of the Revised Code, a natural gas company granted an exemption under section 4929.04 of the Revised Code for a commodity sales service or ancillary service may designate the natural gas supplies that have been obtained to provide that exempt service. Nothing in this section prevents the public utilities commission from exercising its authority under section 4905.302 of the Revised Code, provided, however, that the designation of the supplies for the exempt service and the cost of the designated supplies shall not be considered in the determination of rates and charges for the company's nonexempt services, including rates and charges determined pursuant to section 4905.302 of the Revised Code.
R.C. § 4929.09