C.R.S. § 40-5-104

(1) Any municipality which has acquired or constructed any public utility plant, property, or facility has the power to contract with a public utility for the operation of any part or the whole thereof, subject to the provisions of articles 1 to 7 of this title and to exercise, in respect to such public utility, the powers of regulation and supervision conferred upon it by the commission. (2) Sections 40-5-101 to 40-5-104 shall not apply to railroads.