Oregon Revised Statutes Utility Regulation § 756.075

(1) The Public Utility Commission or authorized representatives may enter upon any premises, or any equipment or facilities operated or occupied by any public utility or telecommunications utility for the purpose of making any inspection, examination or test reasonably required in the administration of ORS chapter 756, 757, 758 or 759 and to set up and use on such premises equipment or facilities any apparatus and appliances and occupy reasonable space therefor.

(2) The commission or authorized representatives shall, upon demand, have the right to inspect the books, accounts, papers, records and memoranda of any public utility or telecommunications utility and to examine under oath any officer, agent or employee of such public utility or telecommunications utility in relation to its business and affairs.

(3) Any person who on behalf of the commission makes demand of a public utility or telecommunications utility for an examination, inspection or test shall, upon request therefor, produce a certificate under the seal of the commission showing authority to make such examination, inspection or test.

(4) Nothing in this section authorizes the commission to use any information developed thereunder for any purpose inconsistent with any statute administered by the commission or to make a disclosure thereof for other than regulatory purposes.