Okla. Stat. tit. 18, § 18-437.25: Exemption from excise and income taxes - License fee

Each cooperative and each foreign corporation transacting

business in this state pursuant to this act shall pay annually, on

or before the thirty-first day of August, to the Oklahoma Tax

Commission, a fee of One Dollar ($1.00) for each one hundred persons

or fraction thereof to whom electricity is supplied within the state

by it, as of June thirtieth preceding, but shall be exempt from all

other excise and income taxes whatsoever.