Sec. 59.027.  CONSUMER COMPLAINTS REGARDING TARIFFS.  (a)  This chapter does not restrict:
(1)  a consumer's right to complain to the commission about the application of an ambiguous tariff;  or
(2)  the commission's right to determine:
(A)  the proper application of that tariff;  or
(B)  the proper tariff rate if that tariff does not apply.
(b)  This section does not permit the commission to:
(1)  lower a tariff rate except as specifically provided by this title;
(2)  change the commission's interpretation of a tariff;  or
(3)  extend the application of a tariff to a new class of customers.
Acts 1997, 75th Leg., ch. 166, Sec. 1, eff. Sept. 1, 1997.