Okla. Stat. tit. 68, § 68-2602: Application of tax

The tax authorized to be levied under Section 1, of this act,

shall, when levied, apply to all persons, firms, associations or

corporations engaged in the business of furnishing power, light,

heat, gas, electricity or water in any city or town, except it shall

not apply to any person, firm, association or corporation operating

under a valid franchise from said city or town.