Tex. Util. Code § 161.065
(a) A person is eligible to become a member of an electric cooperative if the person has a dwelling, structure, apparatus, or point of delivery at which the person does not receive central station service from another source and that is located in an area in which the cooperative is authorized to provide electric energy, and the person:
Acts 1997, 75th Leg., ch. 166, Sec. 1, eff. Sept. 1, 1997.