Tex. Utilities Code § 33.123

(a) For a period of 10 years beginning on the later of August 28, 1989, or the effective date of the rate ordinance that is the subject of the commission's final order invoking the application of this section, the commission has appellate jurisdiction over the rates charged by the municipally owned utility, outside the municipality, as provided by this section.

(b) Except as otherwise provided by this section, a ratepayer of a municipally owned utility subject to this section who resides outside the municipality may appeal any action of the governing body of a municipality affecting the rates charged by the municipally owned utility outside the municipality by filing a petition for review with the commission in the manner provided for an appeal under Subchapter D. The petition must plainly disclose that the cost of the appeal will be funded by a surcharge on the monthly electric bills of ratepayers outside the municipality as prescribed by the commission.

(c) After the commission approves the sufficiency of a petition, the appellants shall submit to the office for approval a budget itemizing the scope and expected cost of consultant services to be purchased by the appellants in the appeal.

(d) Not later than the 120th day after the date the commission enters its final order, the municipality shall assess a onetime surcharge on a per capita basis among residential ratepayers who reside outside the municipality to pay the reasonable consultant and legal costs approved by the counsellor. The municipality shall reimburse the appellants for incurred costs not later than the 90th day after the date the commission enters its final order.

(e) A municipality may not:

(1) include the costs associated with its defense of an appeal under this section in the rates charged a ratepayer outside the municipality; or

(2) if the municipality appeals an order entered by the commission under this section, include the costs associated with its appeal in the rates charged a ratepayer outside the municipality.

(f) A ratepayer who brings an appeal under this section may not receive funding for rate case expenses except from a residential ratepayer who resides outside the municipality or from another municipality inside whose boundaries the municipally owned utility provides service. The commission shall adopt rules for reporting financial and in-kind contributions in support of an appeal under this section. If the commission finds that an appellant has received contributions from a source other than from a ratepayer who resides outside the municipality or from another municipality, the appeal and each commission order entered in the appeal are void.

(g) The commission has jurisdiction in an appeal under this section to review and ensure that the revenue requirements of a municipally owned utility subject to this section are reasonable. The jurisdiction under this subsection does not extend to regulating the use and level of a transfer of the utility's revenues to the municipality's general fund.

(h) The commission has jurisdiction to review the cost allocation and rate design methodologies adopted by the governing body of a municipally owned utility subject to this section. If the commission finds that the cost-of-service methodologies result in rates that are unjust, unreasonable, or unreasonably discriminatory or unduly preferential to a customer class, the commission may order the implementation of ratesetting methodologies the commission finds reasonable. The commission's jurisdiction under this subsection does not include intra-class residential rate design.

(i) An intervenor in an appeal under this section is limited to presenting evidence on cost allocation and rate design methodologies, except that an intervenor may present evidence in support of the municipality on an issue related to utility revenues.
ologies the commission finds reasonable. The commission's jurisdiction under this subsection does not include intra-class residential rate design.

(i) An intervenor in an appeal under this section is limited to presenting evidence on cost allocation and rate design methodologies, except that an intervenor may present evidence in support of the municipality on an issue related to utility revenues.

(j) A ratepayer of a municipally owned utility subject to this section who resides outside the municipality may elect to petition for review under either this section or Subchapter D when appealing a rate ordinance or other ratesetting action of the governing body of a municipality.