Mont. Code § 69-4-101
A telegraph, telephone, electric light, or electric power line corporation or public body or any other person owning or operating such is hereby authorized to install its respective plants and appliances necessary for service and to supply and distribute electricity for lighting, heating, power, and other purposes and to that end, to construct such telegraph, telephone, electric light, or electric power lines, from point to point, along and upon any of the public roads, streets, and highways in the state, by the erection of necessary fixtures, including posts, piers, and abutments necessary for the wires. The same shall be so constructed as not to incommode or endanger the public in the use of said roads, streets, or highways, and nothing herein shall be so construed as to restrict the powers of city or town councils.
§ 69-4-101, MCA