Okla. Admin. Code § 165:45-17-19
It is recognized that a utility, as a result of the restructuring and unbundling of its natural gas services pursuant to this Subchapter, may have stranded costs. After the Commission has approved the utility's unbundling plan, any utility may seek to recover its prudent and verifiable stranded costs through the filing of a general rate cause or through an application for recovery of its stranded costs. If the utility elects to file an application for recovery of its stranded costs outside of a general rate cause, the utility shall provide information and data comparable to the information and data required pursuant to OAC 165:70, unless otherwise ordered by the Commission. The Commission shall conduct a hearing and the utility shall have the burden of identifying proposed stranded costs, the amount of such costs and proposed methods for recovery of its stranded and/or transitional costs. When reviewing the utility's request to recover said costs, the Commission may consider mitigation strategies of the utility. Following notice and hearing, the Commission shall determine the amount of any stranded cost which may be recovered from the utilities' customers and the manner in which such recovery shall occur. The Commission recognizes that after the initial hearing process there may be a need to allow for additional hearings for "true-up" purposes.
Okla. Admin. Code § 165:45-17-19