Not later than December 31, 1997, the owner or operator of an existing unit subject to the emissions limitation requirements of section
7651d
(b) and (c) of this title may demonstrate to the permitting authority that one or more units will be repowered with a qualifying clean coal technology to comply with the requirements under section
7651d of this title. The owner or operator shall, as part of any such demonstration, provide, not later than January 1, 2000, satisfactory documentation of a preliminary design and engineering effort for such repowering and an executed and binding contract for the majority of the equipment to repower such unit and such other information as the Administrator may require by regulation. The replacement of an existing utility unit with a new utility unit using a repowering technology referred to in section
7651a
(2) of this title which is located at a different site, shall be treated as repowering of the existing unit for purposes of this subchapter, if—