Tex. Util. Code § 41.062

Any competition transition charge shall be allocated among retail customer classes based on the relevant customer class characteristics as of the end of the electric cooperative's most recent fiscal year before implementation of customer choice, in accordance with the methodology used to allocate the costs of the underlying assets or expenses in the electric cooperative's most recent cost of service study certified by a professional engineer or certified public accountant or approved by the commission. In multiply certificated areas, a retail customer may not avoid stranded cost recovery charges by switching to another electric cooperative, an electric utility, or a municipally owned utility.