Okla. Stat. tit. 17, § 17-164: Fees for rebates or refunds

For all rebates or refunds made through the intervention or

agency of the Corporation Commission, a fee of ten per cent on such

rebates or refund shall be charged and deducted from such amount

rebated or refunded through such intervention or agency of the

Corporation Commission, and same shall be converted into the State

Treasury as provided by law.