Section 15-7-204 - General powers(a) Any city or town may: (i) Purchase electric current from outside its corporate limits upon terms and conditions agreed upon by the parties; (ii) Construct an electric transmission line or electric power line upon and over all public roads and state highways if it does not interfere with the public in the use of the public roads and state highways; (iii) Enact ordinances necessary to exercise the powers granted in this article and establish rules and regulations for the conduction, maintenance and operation of any electric transmission line constructed, purchased, extended or maintained and providing for the rates to be charged consumers of electric current either for lights, power or other purposes and for their collection.