If, from any rural territory not now being served, application be made to the Commission by a group of five or more persons, natural or artificial, to require an extension of electric service to such territory, the Commission shall, if necessary to accomplish the purposes sought, fix a time for hearing such application, on such terms and conditions as the Commission may prescribe, and, if it be established to the satisfaction of the Commission that a proper guaranteed revenue for a sufficient number of years will accrue to any company which may be required to construct the desired extension, and that a reasonable investment will accrue to the company constructing such extension, then the Commission is hereby authorized and empowered to require the nearest or most advantageously located electric utility company to such territory to construct such extension to such point or points in such territory and to serve such customer or customers therein, as in its judgment is right and proper.