Clean Fleet Enterprise Replace Aging Diesel Trucks

What This Bill Actually Does

Colorado's Clean Fleet Enterprise currently helps fleet owners transition to lower-emission vehicles, like electric or compressed natural gas (CNG) trucks. But right now, state law has a strict cutoff on the books: starting in 2027, the enterprise would only be allowed to fund CNG vehicles if electric trucks aren't "practically available" or don't meet operational needs. SB26-021 completely repeals that strict EV-first limitation. This gives fleet operators more flexibility to choose alternative fuels—specifically those running on recovered methane—without having to prove to the state that an electric truck can't handle their heavy cargo or long routes.

The biggest change in this bill, however, is a brand-new replacement program targeting the oldest, dirtiest rigs on the road. Until December 31, 2031, the state will offer grants, rebates, or revolving loans to help owners of aging heavy-duty diesel trucks upgrade to a new heavy-duty truck. To qualify, the old truck must be a model year 2009 or older, weigh over 26,000 pounds, be based in Colorado, and drive at least 75% of its annual miles in-state. The replacement truck you buy must be a model year 2018 or newer and meet those same in-state mileage requirements.

Here is the part that makes this program fascinating: the state wants to guarantee these older, emissions-heavy trucks don't just get sold to someone else on the secondary market. If you use this state money to upgrade, you must surrender your 2009-or-older truck to an authorized commercial dealer. The dealer is legally required to decommission the vehicle by drilling a three-inch hole through the engine block and cutting the chassis rails in half. The program is financially capped, pulling no more than 20% of the Clean Fleet Enterprise fund's income each year, but it offers a highly pragmatic off-ramp for businesses stuck with aging fleets.

What It Means for You

As a regular Colorado resident, you probably aren't driving a 26,000-pound commercial diesel rig to drop the kids at school or pick up groceries. But this bill directly impacts your daily life by targeting the air quality in your neighborhood, especially if you live near major logistics hubs, interstate highways, or industrial zones. Diesel exhaust from older, pre-2010 trucks is a disproportionately massive contributor to ground-level ozone and particulate matter in the air we breathe. By offering financial carrots to get these old engines off the road—and literally cutting them in half to ensure they stay off—the state is trying to clean up the air along the Front Range without regulating the local trucking industry out of existence.

There is also a very real consumer angle here. When local freight companies, plumbers, and general contractors face massive, six-figure bills to upgrade their fleets to meet modern emissions standards, those costs inevitably trickle down to the price of your home renovations, retail goods, and local services. By providing state-backed grants and low-interest loans to offset the upfront costs of a 2018-or-newer truck, this bill helps stabilize local supply chains. It's a practical middle ground: giving businesses a financial lifeline to modernize without mandating they jump straight to electric vehicles that might not yet have the range or towing capacity they need for mountain passes.

• Check your local air quality initiatives: If you live in a Disproportionately Impacted Community, keep an eye on how the Clean Fleet Enterprise distributes these funds. They often prioritize grants in areas with the most severe air quality challenges.
• Contact your state senator: SB26-021 is currently in the Senate Transportation & Energy Committee. If you have strong feelings about state funds being used to subsidize commercial trucking upgrades, let your representative know before it heads to a floor vote.

What It Means for Your Business

If you own a logistics company, a general contracting firm, or a regional distribution business, this is the exact kind of legislation you need on your immediate radar. Upgrading a Class 8 heavy-duty truck is a massive capital expense, often deferred as long as possible. Under SB26-021, if you are running an aging heavy-duty diesel truck (2009 or older) that logs at least 75% of its miles in Colorado, you are about to get access to a new pool of state money to help buy a new heavy-duty truck (2018 or newer). This bridges the expensive gap between old, maintenance-heavy diesel rigs and modern, lower-emission vehicles without forcing you into an EV ecosystem you might not be ready for.

For authorized commercial truck dealers, this bill creates a brand-new revenue pipeline but comes with strict operational strings attached. To process these state-backed transactions, the dealership must physically decommission the trade-in vehicle. That means your service department must drill a three-inch hole in the engine block and sever the chassis rails. Dealers must also formally certify that the 2018-or-newer replacement vehicle meets all current state and federal emissions and safety standards. If you're a buyer, remember that this program sunsets on December 31, 2031, and is capped at 20% of the Clean Fleet Enterprise Fund's annual revenue—so the money is finite and will likely be highly competitive on a first-come, first-served basis.

• Audit your fleet's model years: Pull your fleet maintenance records this week. Identify any trucks with a Gross Vehicle Weight Rating over 26,000 lbs that are model year 2009 or older. These are your golden tickets for this upcoming grant and rebate program.
• Talk to your commercial dealer: If you are a fleet manager, ask your authorized dealer if they are preparing to participate in the Clean Fleet Enterprise decommissioning program. Not every dealer will have the setup or desire to handle the liability of cutting chassis in half.
• Track your mileage: Ensure your pre-2010 trucks are actively documenting that at least 75% of their miles are driven within Colorado state lines, as this is a strict legal prerequisite for the funding.

Follow the Money

According to the nonpartisan fiscal note, SB26-021 doesn't actually require any new state appropriations or taxpayer dollars from the General Fund. Instead, it redirects how existing money can be spent. The Clean Fleet Enterprise, which generates its ongoing revenue from retail delivery fees (the small fee on your Amazon packages) and prearranged ride fees (like Uber and Lyft), will fund these grants and loans out of its existing bank account. The bill specifically caps the heavy-duty truck replacement program at 20% of the enterprise's annual income, ensuring it doesn't accidentally drain funds meant for other clean air initiatives.

From an administrative standpoint, the Colorado Department of Public Health and Environment (CDPHE) will experience a minimal workload increase to process these new financing applications. They will also spend a bit of time evaluating if this "destroy-the-old-truck" strategy qualifies as a federally recognized transportation control measure under the Clean Air Act. Because the total pie of state funding isn't growing—it's just being sliced differently to include these older diesel buybacks—local governments and everyday taxpayers won't see any direct financial hit or tax increase from this bill.

Where This Bill Stands

SB26-021 was introduced in the Senate on January 14, 2026, and is currently assigned to the Senate Transportation & Energy Committee. This bill has serious momentum right out of the gate—it was officially recommended by the Transportation Legislation Review Committee, an interim group that studies transportation issues year-round. That committee endorsement is a strong indicator that the policy has been thoroughly vetted and enjoys institutional support before even hitting the floor.

Given its bipartisan prime sponsorship (Senators Mullica and Simpson; Representatives Barron and Paschal) and the fact that it doesn't ask for new General Fund tax money, its legislative trajectory looks very promising. The real debate in committee hearings will likely center on the 20% funding cap and the physical logistics of forcing dealerships to destroy heavy machinery. If it passes both chambers and is signed by the Governor, the law would take effect 90 days after the legislative session adjourns sine die—likely mid-August 2026.