|(a) The adoption of this chapter does not preclude the Public Utility Commission of Texas (commission) from altering or amending any sections of this chapter in whole or in part, or from requiring any other or additional services, equipment, facilities, or standards, either upon complaint or upon its own motion or upon application of any person. Furthermore, this chapter will not relieve electric utilities, including transmission and distribution utilities, non-utility wholesale and retail market participants, or electric customers from any duties under the laws of this state or the United States. If any provision of this chapter is held invalid, such invalidity shall not affect other provisions or applications of this chapter which can be given effect without the invalid provision or application, and to this end, the provisions of this chapter are declared to be severable. This chapter shall not be construed so as to enlarge, diminish, modify, or alter the jurisdiction, powers, or authority of the commission. (b) The commission may make exceptions to this chapter for good cause.