(a) Refunds. Any rate or charge collected for any sale, transportation, or assignment conducted pursuant to this part which exceeds the rates or charges authorized by this part shall be refunded.

(b) Interest. All refunds made pursuant to this section must include interest at an amount determined in accordance with §154.501(d) of this chapter.

[44 FR 52184, Sept. 7, 1979, as amended at 44 FR 53505, Sept. 14, 1979; Order 273, 48 FR 1288, Jan. 12, 1983; Order 581, 60 FR 53072, Oct. 11, 1995]