(a) The commission may establish standardized grant amounts based on the incremental costs associated with the purchase or lease of different categories of motor vehicles, including the type of fuel used, vehicle class, and other categories the commission considers appropriate.
(b) In determining the incremental costs and setting the standardized grant amounts, the commission may consider the difference in cost between a new motor vehicle operated using conventional gasoline or diesel fuel and a new motor vehicle operated using alternative fuel.

(c) The amount of a grant for the purchase or lease of a motor vehicle may not exceed the amount of the incremental cost of the purchase or lease.
(d) The commission may establish grant amounts to reimburse the full cost of the purchase, lease, installation, or procurement of refueling infrastructure, equipment, or services or may establish criteria for reimbursing a percentage of the cost.
(e) A grant under the program may be combined with funding from other sources, including other grant programs, except that a grant may not be combined with other funding or grants from the Texas emissions reduction plan. When combined with other funding sources, a grant may not exceed the total cost to the grant recipient.
(f) In providing a grant for the lease of a motor vehicle under this chapter, the commission shall establish criteria:
(1) to offset incremental costs through an up-front payment to lower the cost basis of the lease; or
(2) if determined appropriate by the commission, to provide for reimbursement of lease payments over no more than the period of availability of the contracted funds under applicable state law and regulation, which may be less than the required three-year lease term.
(g) In providing a grant for the lease of refueling infrastructure, equipment, or services, the commission shall establish criteria:
(1) to offset incremental costs through an up-front payment to lower the cost basis of the lease; or
(2) if determined appropriate by the commission, to provide for reimbursement of lease payments over no more than the period of availability of the contracted funds under applicable state law and regulation, which may be less than the required three-year lease term.
(h) Notwithstanding Subsection (d), the commission is not obligated to fund the full cost of the purchase, lease, installation, or procurement of refueling infrastructure, equipment, or services if those costs cannot be incurred and reimbursed over the period of availability of the funds under applicable state law and regulation.