When and as required by the public utilities commission, every public utility shall file with it a copy of any contract, agreement, or arrangement, in writing, with any other public utility relating in any way to the construction, maintenance, or use of its plant or property, or to any service, rate, or charge.
Copy of contract may be required by commission
Ohio Rev. Code Ann. § 4905.16, under Chapter 4905 | Public Utilities Commission - General Powers.
Ohio Rev. Code Ann. § 4905.16