Okla. Stat. tit. 17 § 158.54
Notice, in a form to be specified by the Corporation Commission, of the public hearing to be held pursuant to Section 4 of this act shall be mailed, or shall be given in such other manner as may be determined by the Commission, by the rural electric cooperative to its customers within ten (10) business days after it has received notice of the hearing from the Commission. The expenses of preparation and mailing and giving of such notice shall be borne by the person filing the statement required by Section 2 of this act. As security for the payment of such expenses, the Commission may require such person to file with the Commission an acceptable bond or other deposit in an amount to be determined by the Commission.
Okla. Stat. tit. 17, § 158.54