; (B) by striking subparagraph (L) and inserting the following: (L) a project by a commercial service airport for the acquisition of airport-owned vehicles or ground support equipment equipped with low-emission technology if the airport is located in an air quality nonattainment or maintenance area (as defined in sections 171(2) and 175A of the Clean Air Act ( 42 U.S.C. 7501(2) ; 7505a)), if the airport would be able to receive appropriate emission credits (as described in section 47139), and the vehicles are; (i) used exclusively on airport property; or (ii) used exclusively to transport passengers and employees between the airport and the airport’s consolidated rental car facility or an intermodal surface transportation facility adjacent to the airport. ; and (C) by adding at the end the following: (P) an on-airport project to improve the reliability and efficiency of the airport’s power supply and to prevent power disruptions to the airfield, passenger terminal, and any other airport facilities, including the acquisition and installation of electrical generators, separation of the airport’s main power supply from its redundant power supply, and the construction or modification of airport facilities to install a microgrid (as defined in section 641 of the United States Energy Storage Competitiveness Act of 2007 ( 42 U.S.C. 17231 )). (Q) converting or retrofitting vehicles and ground support equipment into eligible zero-emission vehicles and equipment (as defined in section 47136) and for acquiring, by purchase or lease, eligible zero-emission vehicles and equipment. (R) predevelopment planning, including financial, legal, or procurement consulting services, related to an application or proposed application for an exemption under section 47134. ; (2) in paragraph (5), by striking regulations and inserting requirements