Within one hundred twenty (120) days after the effective date of this act, all municipally owned or operated electric or gas utilities having facilities located outside of and more than three (3) miles from the corporate limits of the city shall file with the corporation commission in the manner prescribed by the commission:
(a) A schedule of rates charged to all consumers outside of and more than three (3) miles from the corporate limits of such municipality; and
(b) the location of all facilities of such utility located outside of and more than three (3) miles from the corporate limits of such municipality.