Tex. Util. Code § 54.252
(a) Except to the extent otherwise ordered by the commission in accordance with this subchapter, the holder of a certificate of convenience and necessity may not discontinue, reduce, or impair service to any part of the holder's certificated service area except for:
Acts 1997, 75th Leg., ch. 166, Sec. 1, eff. Sept. 1, 1997.
Amended by Acts 2003, 78th Leg., ch. 76, Sec. 2, eff. Sept. 1, 2003.