Okla. Stat. tit. 17, § 158.29
When an area, which is included in whole or in part in any territory or territories certified to a retail electric supplier or suppliers under this act, is annexed to and becomes a part of an incorporated city or town, the certification of such territory or territories hereunder shall be null and void. In such event, the Commission shall be notified and the appropriate maps be corrected accordingly.
Added by Laws 1971, SB 198, c. 113, § 9.