Oregon Revised Statutes Utility Regulation § 756.543

(1) The Public Utility Commission shall issue subpoenas to any party to a proceeding before the commission upon request and proper showing of the general relevance and reasonable scope of the evidence sought. Witnesses appearing pursuant to subpoena, other than the parties or their officers or employees, or employees of the commission, shall receive fees and mileage as prescribed by law for witnesses in ORS 44.415 (2). If the commission certifies that the testimony of a witness was relevant and material, any person who paid fees and mileage to that witness shall be reimbursed by the commission and from moneys referred to in ORS 756.360, subject to the limitations provided in ORS 756.360.

(2) If any person fails to comply with any subpoena so issued or any party or witness refuses to testify on any matters on which the person may be lawfully interrogated, the judge of the circuit court of any county, on the application of the commission, or of the party requesting the issuance of the subpoena, shall compel obedience by proceedings for contempt as in the case of disobedience of the requirements of a subpoena issued from such court or a refusal to testify therein.