Section 35.003 - Purchase From Affiliate; Undue Preference Prohibited(a) An electric utility may purchase power from an affiliate in accordance with this title.(b) An electric utility may not grant an undue preference to a person in connection with the utility's purchase or sale of electric energy at wholesale or other utility service. Acts 1997, 75th Leg., ch. 166, Sec. 1, eff. Sept. 1, 1997.