Ohio Rev. Code § 4909.17: Approval required for change in rate.

No rate, joint rate, toll, classification, charge, or rental, no change in any rate, joint rate, toll, classification, charge, or rental, and no regulation or practice affecting any rate, joint rate, toll, classification, charge, or rental of a public utility shall become effective until the public utilities commission, by order, determines it to be just and reasonable, except as provided in this section and sections 4909.18, 4909.19, and 4909.191 of the Revised Code. Such sections do not apply to any rate, joint rate, toll, classification, charge, or rental, or any regulation or practice affecting the same, of railroads, street and electric railways, for-hire motor carriers, and pipe line companies.