Nothing in this article shall be deemed to apply or impose requirements not otherwise existing on gas distribution companies owned by any county, municipality, other political subdivision, or governmental authority of this state; nor are the provisions of this article intended to increase or decrease the authority and jurisdiction of the commission with respect to the distribution, sale, or transportation of gas by any county, municipality, other political subdivision, or governmental authority of this state. Nothing in this article shall be construed to limit or otherwise affect the existing powers of municipal corporations or other political subdivisions of this state relating to the granting of franchises or the levying or imposition of taxes, fees, or charges.