ARM 38.2.2101. WHO MAY COMPLAIN

(1) Complaints may be made by the commission on its own motion or by any person, having a legal interest in the subject matter, or any public utility concerned. Any public utility or other person likewise may complain of anything done or omitted to be done by the commission or any person over whom the commission has jurisdiction in violation of any law, rule, regulation or order administered or promulgated by the commission, pertaining to matters over which the commission has jurisdiction.