Colorado Revised Statutes Title 40. Utilities § 40-3-105. Free and reduced service or transportation prohibited--exceptions

(1) No public utility shall, directly or indirectly, issue, give, or tender any free service, ticket, frank, free pass, or other gratuity of services or any free or reduced rate transportation for passengers or property between points within this state unless a tariff so providing is first filed with and approved by the commission.

(2) Except as otherwise provided in this section, no public utility shall charge, demand, collect, or receive a greater or lesser or different compensation for any product or commodity furnished or to be furnished, or for any service rendered or to be rendered, than the rates, tolls, rentals, and charges applicable to such product or commodity or service as specified in its schedules on file and in effect at the time, nor shall any such public utility refund or remit, directly or indirectly, in any manner or by any device, any portion of the rates, tolls, rentals, and charges so specified, nor extend to any corporation or person any form of contract or agreement or rule or regulation or any facility or privilege except those which are regularly and uniformly extended to all corporations and persons; but the commission may by rule or order establish such exceptions from the operation of this prohibition as it may consider just and reasonable as to each public utility.