Oregon Revised Statutes Utility Regulation § 756.320

Payment of each fee or portion thereof provided for in ORS 756.310 shall be accompanied by a statement verified by the public utility or telecommunications provider involved, showing the basis upon which the fee or portion thereof is computed. This statement shall be in such form and detail as the Public Utility Commission shall prescribe and shall be subject to audit by the commission. The commission may refund any overpayment of any such fee in the same manner as other claims and expenses of the commission are payable as provided by law.