The Secretary shall allocate one credit under this section to a fleet or covered person for each qualifying volume of the biodiesel component of fuel containing at least 20 percent biodiesel by volume purchased after the date of the enactment of this section, for use by the fleet or covered person in vehicles owned or operated by the fleet or covered person that weigh more than 8,500 pounds gross vehicle weight rating.
At the request of a fleet or covered person allocated a credit under subsection (a), the Secretary shall, for the year in which the purchase of a qualifying volume is made, treat that purchase as the acquisition of one alternative fueled vehicle the fleet or covered person is required to acquire under this subchapter, subchapter II, or subchapter III.
Credits allocated under subsection (a) may not be used to satisfy more than 50 percent of the alternative fueled vehicle requirements of a fleet or covered person under this subchapter, subchapter II, and subchapter III. This paragraph shall not apply to a fleet or covered person that is a biodiesel alternative fuel provider described in section 13251(a)(2)(A) of this title.
A credit under this section shall not be considered a credit under section 13258 of this title.
The Secretary shall, before January 1, 1999, issue a rule establishing procedures for the implementation of this section.
The Secretary shall collect such data as are required to make a determination described in subsection (f)(2)(B).