Whenever the commission believes that:

1. (1) any rate or charge may be unreasonable or unjustly discriminatory;
2. (2) any service is inadequate or cannot be obtained; or

3. (3) an investigation of any matter relating to rates or territory for a corporation should be made;

   it may, on its own motion, conduct an investigation with or without notice.

As added by P.L.121-1987, SEC.14.