Utah Code § 63A-9-403: Clean emissions vehicles -- Alternative fuel vehicles.

No later than August 30, 2018, the division shall ensure that 50% or more of new or replacement division-owned state vehicles that are motor vehicles used for the transportation of passengers are motor vehicles with emissions that are equal to or cleaner than the standards established in bin 2 in Table S04-1, of 40 C.F.R. 86.1811-04(c)(6), or any vehicle propelled to a significant extent using one of the following alternative fuels:

(1) electricity from an off-board source;

(2) natural gas;

(3) liquid petroleum gas;

(4) hydrogen; or

(5) biodiesel.