If any municipal corporation or other governmental body, having legal authority by charter or other law, shall desire to supply electric public utility service, or construct, enlarge or acquire, by lease or otherwise, any electric utility facilities, outside its political boundaries, it shall have power to enter into agreements in that regard with affected public utilities which shall be binding in accordance with their terms and for the period therein provided; but no contract entered into under this section shall limit the power of the Commission to fix rates and to otherwise regulate a public utility. No such service by a municipal corporation or other governmental body shall be provided, or facilities constructed, enlarged or acquired, in territory allotted to any public utility by the Commission except in territory served by such municipal corporation or other governmental body on June 26, 1964, unless the affected public utility shall consent by such an agreement or the Commission shall grant a certificate therefor upon application by the municipal corporation or other governmental body pursuant to § 56-265.4, authority for which certification is hereby granted. Provided, however, this limitation on the extension of public utility service by any municipal corporation or governmental body outside its political boundaries shall not be applicable to cities or towns extending their service in accordance with the provisions of § 56-265.4:2. No public utility shall extend its electric public utility service, or construct, enlarge or acquire, by lease or otherwise, any electric utility facilities, in territory served exclusively by a municipal corporation or other governmental body on June 26, 1964, unless such municipal corporation or other governmental body shall consent by such an agreement. In case of question as to the scope of the territory served by a municipal corporation or other governmental body on June 26, 1964, the Commission may, and on application by either such public utility or such municipal corporation or other governmental body shall, decide such question and allot such territory accordingly, between such public utility and such municipal corporation or other governmental body, in which event any expansion of service outside the territory so allotted shall be subject to the applicable provisions of this chapter, provided, however, that nothing contained herein shall prevent any municipal corporation from constructing or maintaining facilities in county areas for the purpose of generating or purchasing electricity to be transmitted into the service area of such municipal corporation.