Okla. Admin. Code § 165:35-38-1
The purpose of this Subchapter is to provide for utility recovery of (1) costs directly associated with transmission upgrades approved by a regional transmission organization of which such utility is a member and which upgrades are the result of an order by a federal regulatory authority having legal jurisdiction over interstate regulation of transmission rates; (2) capital expenditures for equipment or facilities necessary to comply with the Federal Clean Air Act ( Public Law 84-159), as amended, and, as the Commission may deem appropriate, federal, state, local or tribal environmental requirements that apply to generation facilities: and (3) costs associated with the purchase or construction of a generation facility needed to provide reliable service using the competitive bidding RFP Process.
Okla. Admin. Code § 165:35-38-1