Tex. Util. Code § 39.660

All load-serving entities that receive offsets to specific uplift charges from the independent organization under this subchapter must adjust customer invoices to reflect the offsets for any charges that were or would otherwise be passed through to customers under the terms of service with the load-serving entity, including by providing a refund for any offset charges that were previously paid. An electric cooperative, including an electric cooperative that elects to receive offsets, shall not otherwise become subject to rate regulation by the commission and receipt of offsets does not affect the applicability of Chapter 41 to an electric cooperative.