The Director shall from time to time fix maximum prices at which gas supplied by public gas suppliers may be resold, and shall publish the prices so fixed in such manner as in his opinion will secure adequate publicity therefor.

Different prices may be fixed under this section in different classes of cases which may be defined by reference to areas, tariffs applicable to gas supplied by the suppliers or any other relevant circumstances.

If any person resells any gas supplied by a public gas supplier at a price exceeding the maximum price fixed under this section and applicable thereto, the amount of the excess shall be recoverable by the person to whom the gas was resold.