Texas Utilities Code - UTIL § 36.003. Just and Reasonable Rates

(a) The regulatory authority shall ensure that each rate an electric utility or two or more electric utilities jointly make, demand, or receive is just and reasonable.

(b) A rate may not be unreasonably preferential, prejudicial, or discriminatory but must be sufficient, equitable, and consistent in application to each class of consumer.

(c) An electric utility may not:

(d) In establishing an electric utility's rates, the commission may treat as a single class two or more municipalities that an electric utility serves if the commission considers that treatment to be appropriate.

(e) A charge to an individual customer for retail or wholesale electric service that is less than the rate approved by the regulatory authority does not constitute an impermissible difference, preference, or advantage.