Tex. Utilities Code § 104.109: BONDED RATES.

(a) A gas utility may put a changed rate into effect by filing a bond with the regulatory authority if the regulatory authority fails to make a final determination within 90 days from the date the proposed increase would otherwise be effective.

(b) The bonded rate may not exceed the proposed rate.

(c) The bond must be:

(1) payable to the regulatory authority in an amount, in a form, and with a surety approved by the regulatory authority; and

(2) conditioned on refund.

(d) The gas utility shall refund or credit against future bills:

(1) money collected under the bonded rates in excess of the rate finally ordered; and

(2) interest on that money, at the current interest rate as determined by the regulatory authority.

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