1. Short title This Act may be cited as the Making Pipelines Accountable to Consumers and Taxpayers Act or the MPACT Act . 2. Hearing on changed rates or charges Section 4(e) of the Natural Gas Act ( 15 U.S.C. 717c(e) ) is amended by striking the third and fourth sentences and inserting the following: Where changes in rates or charges are thus made effective, the Commission may, by order, require the natural-gas company to furnish a bond, to be approved by the Commission, to refund any amounts ordered by the Commission, to keep accurate accounts in detail of all amounts received by reason of those changes, specifying by whom and in whose behalf those amounts were paid, and, on completion of the hearing and decision, to order the natural-gas company to refund, with interest, the portion of those rates or charges by its decision found not justified. At any hearing involving a rate or charge sought to be changed, the burden of proof to show that the changed rate or charge is just and reasonable shall be on the natural-gas company, and the Commission shall give to the hearing and decision of such questions preference over other questions pending before the Commission and decide the same as speedily as possible. . 3. Refunds Section 5 of the Natural Gas Act ( 15 U.S.C. 717d ) is amended— (1) by redesignating subsection (b) as subsection (d)