Okla. Stat. tit. 18 § 437.23
Any corporation organized on a nonprofit or a cooperative basis for the purpose of supplying electric energy in rural areas and owning and operating electric transmission or distribution lines in a state adjacent to this state may file in the office of the Secretary of State a certified copy of its charter or articles of incorporation which shall be recorded in a book to be kept by the Secretary of State for that purpose, and thereupon, upon payment of the fees required of a cooperative for the filing of articles of incorporation, and the appointment of a service agent as provided by law, such foreign corporation shall be authorized to transact business in this state and shall have all the rights, powers and privileges conferred upon a cooperative under this act.
Okla. Stat. tit. 18, § 437.23