1. Short title This Act may be cited as the Postal Vehicle Modernization Act . 2. Authorization of appropriation for United States Postal Service for modernization of postal infrastructure There is authorized to be appropriated to the United States Postal Service for the modernization of postal infrastructure and operations, including through capital expenditures to purchase delivery vehicles, processing equipment, trailers, and other goods, $25,000,000,000, to remain available until expended, of which $6,000,000,000 shall be for the purchase of vehicles. Any amount appropriated under this section shall be deposited into the Postal Service Fund established under section 2003 of title 39, United States Code. 3. Electric or zero-emission vehicles for United States Postal Service fleet (a) In general Any next generation delivery vehicle purchased by the United States Postal Service using the funds appropriated under section 2 shall, to the greatest extent practicable, be an electric or zero-emission vehicle, and the Postal Service shall ensure that at least 75 percent of the total number of vehicles purchased using such funds shall be electric or zero emission vehicles. In this subsection, the term next generation delivery vehicle means a vehicle purchased to replace a right-hand-drive, long-life vehicle in use by the Postal Service. (b) Medium- and heavy-Duty vehicles (1) Date of enactment and 2030 Between the period beginning on the date of enactment of this Act and ending on December 31, 2029, not less than 50 percent of the total number of new medium- or heavy-duty vehicles purchased by the Postal Service during such period shall be electric or zero-emission vehicles. (2) After 2039 Beginning on January 1, 2040, the Postal Service may not purchase any new medium- or heavy-duty vehicle that is not an electric or zero-emission vehicle. (c) Compliance In carrying out subsections (a) and (b), the Postal Service shall comply with chapter 83 of title 41, United States Code (popularly known as the Buy American Act),