39 Miss. Code. R. 1-7-101
Except as allowed by this rule or by the Act, no person shall provide or render any public utility service to anyone outside of the geographical area or areas certificated to that person by the Commission.
Petitions to enlarge, diminish or alter the boundaries of a certificated area shall be granted upon good cause shown and shall contain or be accompanied by the data and documentation shown in Schedule 2 of Appendix A.
Exceptions to the requirements of this Section "B" may be granted by letter from the Commission or its Executive Secretary, and after receiving a written recommendation of the Executive Director of the Staff determining that the extensions of service outside the boundaries of the certificated area is:
Exceptions granted under this rule shall be deemed to be by the continuing consent of the Commission and any affected utility, and the utility granted the exception shall not be deemed to have any vested interest or right to serve the area or customers involved.
39 Miss. Code. R. 1-7-101