Mont. Code Ann. § 69-3-209

If any public utility violates any provision of this chapter, does any act herein prohibited, or fails or refuses to perform any duty enjoined upon it, fails to place in operation any rate or joint rate, or fails, neglects, or refuses to obey any lawful requirement or order made by the commission or any court, then for every such violation, failure, or refusal the public utility is subject to the penalty prescribed by 69-3-206.