104TH GENERAL ASSEMBLY
State of Illinois
2025 and 2026
HB4399
 
Introduced 1/14/2026, by Rep. Eva-Dina Delgado
 
SYNOPSIS AS INTRODUCED:
 
625 ILCS 5/12-705.1
    Amends the Illinois Vehicle Code. Provides that, beginning July 1, 2027, a diesel powered vehicle owned or operated by the State, any county or unit of local government, any school district, any community college or public college or university, or any mass transit agency must use a biodiesel blend that contains 19%, unless the engine is designed or retrofitted to operate on a higher percentage of biodiesel or on ultra low sulfur fuel. Allows, in December, January, February, and March, a biodiesel blend of at least 10% to be used. Effective immediately.


LRB104 17513 LNS 30940 b

 
 
A BILL FOR
 
HB4399LRB104 17513 LNS 30940 b

1    AN ACT concerning transportation.
 
2    Be it enacted by the People of the State of Illinois, 
3represented in the General Assembly:
 
4    Section 5. The Illinois Vehicle Code is amended by 
5changing Section 12-705.1 as follows:
 
6    (625 ILCS 5/12-705.1)
7    Sec. 12-705.1. Required use of biodiesel by certain 
8vehicles.
9    (a) Beginning July 1, 2006, any diesel powered vehicle 
10owned or operated by this State, any county or unit of local 
11government, any school district, any community college or 
12public college or university, or any mass transit agency must, 
13when refueling at a bulk central fueling facility, use a 
14biodiesel blend that contains 5% biodiesel, as those terms are 
15defined in the Illinois Renewable Fuels Development Program 
16Act, where available, unless the engine is designed or 
17retrofitted to operate on a higher percentage of biodiesel or 
18on ultra low sulfur fuel.
19    (a-1) Beginning July 1, 2027, any diesel powered vehicle 
20owned or operated by this State, any county or unit of local 
21government, any school district, any community college or 
22public college or university, or any mass transit agency must 
23use a biodiesel blend that contains 19%, as those terms are 
 
 
HB4399- 2 -LRB104 17513 LNS 30940 b

1defined in the Illinois Renewable Fuels Development Program 
2Act, where available, unless the engine is designed or 
3retrofitted to operate on a higher percentage of biodiesel or 
4on ultra low sulfur fuel. In December, January, February, and 
5March, a biodiesel blend of at least 10% may be used. 
6    (b) Nothing in this Section prohibits any unit of 
7government from using a biodiesel blend containing more than 
82% biodiesel.
9    (c) As used in this Section, a "bulk central fueling 
10facility" means a non-commercial fueling facility whose 
11primary purpose is the fueling of vehicles owned or operated 
12by the State, a county or unit of local government, a school 
13district, a community college or public college or university, 
14or a mass transit agency.
15    (d) The Secretary of Transportation shall adopt rules for 
16implementing this Section. 
17(Source: P.A. 96-281, eff. 8-11-09.)
 
18    Section 99. Effective date. This Act takes effect upon 
19becoming law.