I. If 2 or more telephone utilities find that they provide the same service in the same area or that existing maps create overlapping service territories, the department of energy, upon application by one or both of the affected utilities, shall define, alter, or establish service territories. In establishing or altering service territories, the department of energy shall consider the following:
(a) Existing service areas;
(b) Any voluntary agreements between or among 2 or more such telephone utilities which define the service territories of those utilities;
(c) Consistency with the orderly development of the region;
(d) Natural geographical boundaries;
(e) Compatibility with the interests of all consumers; and
(f) All other relevant factors.