(a)
Terms and conditions generally
Any exemption from any prohibition under this part shall be on such terms and conditions as the Secretary determines appropriate, including terms and conditions requiring the use of effective fuel conservation measures which are practicable and consistent with the purposes of this chapter. In the case of any temporary exemption, the terms and conditions (which may include a compliance plan meeting the requirements of subsection (b) of this section) shall be designed to insure that upon the expiration of such exemption, the persons and powerplant covered by such exemption will comply with the applicable prohibitions.