Mo. Rev. Stat. § 91.030

Any city, town or village in this state, having authority to maintain and operate an electric light and power plant, may procure electric current and ancillary services for that purpose from any other city, owning and operating such plant, or other lawful supplier and to that end may enter into a contract therefor with such city or other supplier having such plant for such period and upon such terms as may be agreed by the contracting parties solely on the approval by the governing board or council of such municipality owned or operated electric power system or by its duly authorized representative without further regulatory or public approval, notwithstanding any provisions of law to the contrary.