Whenever any gas company whose rates are subject to the jurisdiction of the commission shall receive any refund of amounts charged and collected from it on account of natural gas purchased by it, by reason of any reduction of rates or disallowance of an increase in rates of the seller of such natural gas pursuant to an order of the federal power commission, whether such refund shall be directed by the federal power commission or by any court upon review of such an order or shall otherwise accrue to such company, the commission shall have power after a hearing, upon its own motion, upon complaint, or upon the application of such company, to determine whether or not such refund should be passed on, in whole or in part, to the consumers of such company and to order such company to pass such refund on to its consumers, in the manner and to the extent determined just and reasonable by the commission.