Ohio Rev. Code § 4909.08
When the public utilities commission has completed the valuation of the property of any public utility or railroad and before such valuation becomes final, it shall give notice by registered letter to such public utility or railroad, and if a substantial portion of said public utility or railroad is situated in a municipal corporation, then to the mayor of such municipal corporation, stating the valuations placed upon the several kinds and classes of property of such public utility or railroad and upon the property as a whole and give such further notice by publication or otherwise as it shall deem necessary to apprise the public of such valuation. If, within thirty days after such notification, no protest has been filed with the commission, such valuation becomes final. If notice of protest has been filed by any public utility or railroad, the commission shall fix a time for hearing such protest and shall consider at such hearing any matter material thereto presented by such public utility, railroad, or municipal corporation, in support of its protest or by any representative of the public against such protest. If, after the hearing of any protest of any valuation so fixed, the commission is of the opinion that its inventory is incomplete or inaccurate or that its valuation is incorrect, it shall make such changes as are necessary and shall issue an order making such corrected valuations final. A final valuation by the commission and all classifications made for the ascertainment of such valuations shall be public and are prima-facie evidence relative to the value of the property.
"Valuation" and "value," as used in this section, may include, with respect to a natural gas, water-works, or sewage disposal system company, projected valuation and value as of the date certain, if applicable because of a future date certain under section 4909.15 of the Revised Code.
R.C. § 4909.08