SB 21 Colorado Senate · 2026 Regular Session

Clean Fleet Enterprise Replace Aging Diesel Trucks

Summary
The act authorizes the clean fleet enterprise (enterprise) to incentivize, support, and accelerate the replacement of a truck that is part of a fleet and that is powered by a diesel-fueled internal combustion engine, is a model year of 2009 or earlier, and is registered, operable, and capable of independent roadway operation (aging diesel truck) with a diesel truck that is a model year of 2018 or later (new diesel truck) until December 31, 2031. The act also allows the enterprise to provide funding or financing through grant programs, rebate programs, revolving loan funds, or other strategies to help owners and operators of aging diesel truck fleets finance the replacement of aging diesel trucks with new diesel trucks to reduce the up-front costs of acquiring new diesel trucks until December 31, 2031.     The enterprise may use the clean fleet enterprise fund to provide money to support the replacement of aging diesel trucks with new diesel trucks, but the enterprise is required to ensure that it does not expend more than 20% of the fund's income during a state fiscal year for the support.     To qualify for any money provided by the enterprise for the replacement of aging diesel trucks with new diesel trucks, the act requires a purchaser of the new diesel truck to surrender an aging diesel truck to the seller of the new truck. The seller of the new diesel truck must decommission the aging diesel truck by drilling a hole in the engine's block and cutting the chassis rails in half. The seller must be an authorized dealer of new diesel trucks who must certify that the new diesel truck meets all state and federal emissions and safety standards for its model year.     The enterprise must prioritize applications to replace aging diesel trucks from businesses that are privately owned, independently owned, or have limited access to capital. The enterprise is not allowed to accept an application from the owner or operator of a motor vehicle fleet that owns, leases, or operates more than 50 heavy-duty motor vehicles or from a business entity with annual gross revenue exceeding $100 million. The enterprise is required to prioritize the replacement of an aging diesel truck that has a model year of no later than 2006.     The act expands the business purpose of the enterprise to include providing incentives and support for refrigerated transport units powered by zero emission technology. The act allows the enterprise to exercise its rights and powers without regard to the state 'Procurement Code'.     The act requires the enterprise to annually prepare a report that includes the estimated pollution reduction benefits of the enterprise. The enterprise must seek to ensure that all projects funded by the enterprise achieve measurable results and outcomes.(Note: This summary applies to this bill as enacted.)
Bill status signed all 5 stages cleared
Introduction
Jan 2026
Committee Review
Mar 2026
Senate Passage
Apr 2026
House Passage
Apr 2026
Signed into Law
Apr 2026
Introduced Jan 14, 2026 Signed Apr 20, 2026
Maddy AI version diff · 6 comparisons

What changed between versions

Final Act Signed Act · 5 edits · Apr 20, 2026
MODERATE
The bill was finalized by adding a note regarding the Governor's signature and updating the bill's title to focus on replacing high-emitting trucks. The most significant change is the reorganization of definitions, which removed specific terms like 'personal delivery device' and 'new heavy-duty truck' while introducing new definitions for 'heavy-duty motor vehicle' and 'electric motor vehicle' to broaden the scope of eligible vehicles for replacement programs.
Scope change
The bill's scope expanded to include a broader range of electric vehicles (such as hydrogen fuel cell and plug-in hybrid vehicles) and redefined heavy-duty vehicles to include those over 26,000 pounds, while removing specific exclusions for personal delivery robots and narrowing the model year criteria for eligible trucks.
DEFINITION

Added a note confirming the bill is prepared for the Governor's signature and updated the bill title to reflect the focus on replacing high-emitting trucks.

Redefined 'heavy-duty motor vehicle' to include any vehicle with a gross weight over 26,000 pounds, replacing the previous specific definition of 'aging heavy-duty diesel truck'.

Added a new definition for 'electric motor vehicle' to explicitly include battery electric, hydrogen fuel cell, and plug-in hybrid vehicles.

Removed definitions for 'personal delivery device' and 'new heavy-duty truck,' eliminating specific thresholds for autonomous robots and 2018+ model year trucks.

ELIGIBILITY

Adjusted the list of eligible vehicle types in the fleet definition to focus on heavy-duty, medium-duty, and refrigerated trailer units rather than including personal delivery devices.

Floor votes

How they voted

This bill passed the Senate by voice vote (no roll call recorded).
Full legislative history

Actions timeline

Total actions
18
Key actions
7
Committee
2
Amendments
1
Apr 20, 2026
Signed into law
Governor Signed
executive
Apr 7, 2026
Lower · Passed
Signed by the Speaker of the House
lower
Apr 7, 2026
Upper · Passed
Signed by the President of the Senate
upper
Apr 6, 2026
Introduced
Senate Considered House Amendments - Result was to Concur - Repass
upper
Apr 2, 2026
Lower · Passed
House Third Reading Passed with Amendments - Floor
lower
Mar 17, 2026
Lower · Passed
House Committee on Transportation, Housing & Local Government Refer Unamended to House Committee of the Whole
lower
Mar 3, 2026
Introduced
Introduced In House - Assigned to Transportation, Housing & Local Government
lower
Mar 3, 2026
Upper · Passed
Senate Third Reading Passed - No Amendments
upper
Feb 23, 2026
Upper · Passed
Senate Committee on Transportation & Energy Refer Amended to Senate Committee of the Whole
upper
Jan 14, 2026
Introduced
Introduced In Senate - Assigned to Transportation & Energy
upper
9 primary · 21 co-sponsors

Sponsors