(a) An electric utility shall provide retail electric service during the freeze period in accordance with any contract terms applicable to a particular retail customer approved by the regulatory authority and in effect on December 31, 1998.
(b) Nothing in Sections 39.052(c) and (d) shall be construed to restrict any customer’s right to complain during the freeze period to the regulatory authority regarding the quality of retail electric service provided by the electric utility or the applicability of an electric utility’s particular tariff to the customer.

(c) Nothing in this title shall be construed to restrict an electric utility, voluntarily and at its sole discretion, from offering new services or new tariff options to its customers during the freeze period, consistent with § 39.051(a).
(d) Any offering of new services or tariff options under this section shall be equal to or greater than an electric utility’s long-run marginal cost and may not be unreasonably preferential, prejudicial, discriminatory, predatory, or anticompetitive.
(e) Revenue from any new offering under this section shall be accounted for in a manner consistent with § 36.007.