The commission, or upon order of the commission, any commissioner, or any person or persons employed by the commission, shall upon demand have the right, insofar as applies to intrastate business, to inspect or examine the books, papers, accounts, documents, plant, property and facilities of any public utility operating in Wyoming, and to examine under oath any officer, agent or employee of such public utility in relation to its business and affairs; provided, that any person other than one (1) of the commissioners shall produce when so requested his authority to make inspections or examinations under the hand of a commissioner or of the secretary and under the seal of the commission.
W.S. 37-2-115