Tex. Utilities Code § 104.051: ESTABLISHING OVERALL REVENUES.

In establishing a gas utility's rates, the regulatory authority shall establish the utility's overall revenues at an amount that will permit the utility a reasonable opportunity to earn a reasonable return on the utility's invested capital used and useful in providing service to the public in excess of its reasonable and necessary operating expenses.

Acts 1997, 75th Leg., ch. 166, Sec. 1, eff. Sept. 1, 1997.