Amend CSSB 1915 by adding a new SECTION 8. and renumbering subsequent sections: SECTION 8. Subtitle K, Title I, Public Utility Regulatory Act of 1995 (Article 1446c-0, Vernon's Texas Civil Statutes), is amended by adding Section 1.408 to read as follows: Sec. 1.408. REFUNDS FOR OVER-BILLING. The Commission by rule shall require a public utility that charges a customer more than the lawful rate for the service being purchased by the customer to refund the overcharged amount by an adjustment made for the entire period of the overcharges.