Tennessee Code Title 65. Public Utilities and Carriers § 65-5-104

(1) Make, impose, or exact any unreasonable, unjustly discriminatory or unduly preferential individual or joint rate, or special rate, toll, fare, charge, or schedule for any product, or service supplied or rendered by it within this state; or

(2) Adopt or impose any unjust or unreasonable classification in the making or as the basis of any rate, toll, charge, fare, or schedule for any product or service rendered by it within this state.