Oregon’s Advanced Clean Trucks (ACT) Rule requires manufacturers to gradually sell a greater percentage of medium- and heavy-duty zero-emission vehicles in the state each year, starting with the 2025 model year vehicles. The rules do not ban the sale of new conventional diesel trucks, nor do they require dealers or businesses to purchase ZEV trucks.

On Nov. 21, 2024, the Environmental Quality Commission adopted temporary rules to delay the implementation of new tailpipe emission standards for heavy-duty trucks, and to ease implementation of Oregon’s ACT Rule, by adding additional flexibilities. The rule includes the following flexibilities:

• Providing an additional three years to comply with initial sales targets: Manufacturers will now have three additional years to comply with the first-year targets, with no penalty.
• Adopting near zero-emission vehicles, like plug-in hybrid trucks: Manufacturers will receive credit for the sales of plug-in hybrids, allowing for more vehicle types and routes to lower emissions.
• Using early action credits: Manufacturers can generate and bank credits for ZEV sales of 2022-2024 model years, which can be used to comply with the standard when it takes effect. This incentivizes those who take action early to manufacture and sell ZEVs. Manufacturers have already generated over one thousand credits in advance of the regulation taking effect.
• Banking and trading credits: Manufacturers may continue generating and banking credits to use for compliance in the future, or purchase excess credits earned from other manufacturers, adding flexibility across the industry.
• Using credits across vehicle types (for non-tractor trucks): Manufacturers may use Class 2b-3 and Class 4-8 non-tractor credits interchangeably, providing flexibility for different product portfolios and truck types.
• Using non-tractor credits to meet tractor deficits for manufacturers with 25 or fewer tractor (e.g., semi-truck) deficits: Manufacturers that sell very few Class 7-8 semi-trucks, or tractors, in a model year may use non-tractor credits for tractor compliance.

Upcoming Rulemaking Process

DEQ will initiate a formal rulemaking process in early 2025. First, the agency will convene an advisory committee with representation from diverse industries and interests to advise on permanently adopting these additional flexibilities and consider options for implementation. This process will include discussions on the impacts of the regulation in Oregon, and the challenges and opportunities for manufacturers, fleets and dealers. Advisory committee meetings will be open to the public and DEQ will provide multiple opportunities for the broader public to provide input and comment on proposals. DEQ aims to bring proposed rules to the Environmental Quality Commission for their consideration in July 2025.

For more information about Oregon’s Advanced Clean Truck Rule, please visit:

• Oregon DEQ Medium- and Heavy-Duty Vehicle Emissions web page
• Oregon’s Advanced Clean Trucks Rule FAQ