Section 60.40 - Applicability and designation of affected facility(a) The affected facilities to which the provisions of this subpart apply are: (1) Each fossil-fuel-fired steam generating unit of more than 73 megawatts (MW) heat input rate (250 million British thermal units per hour (MMBtu/hr)).(2) Each fossil-fuel and wood-residue-fired steam generating unit capable of firing fossil fuel at a heat input rate of more than 73 MW (250 MMBtu/hr).(b) Any change to an existing fossil-fuel-fired steam generating unit to accommodate the use of combustible materials, other than fossil fuels as defined in this subpart, shall not bring that unit under the applicability of this subpart.(c) Except as provided in paragraph (d) of this section, any facility under paragraph (a) of this section that commenced construction or modification after August 17, 1971, is subject to the requirements of this subpart.(d) The requirements of §§ 60.44 (a)(4), (a)(5), (b) and (d) , and 60.45(f)(4)(vi) are applicable to lignite-fired steam generating units that commenced construction or modification after December 22, 1976.(e) Any facility subject to either subpart Da or KKKK of this part is not subject to this subpart. 72 FR 32717 , June 13, 2007, as amended at 77 FR 9447 , Feb. 16, 2012