Transport Refrigeration Unit
Transport Refrigeration Units (TRU) are refrigeration systems powered by diesel internal combustion engines designed to refrigerate or heat perishable products that are transported in various containers, including truck vans, semi-truck trailers, shipping containers, and railcars.
More about this program
2022 Amendments to the TRU ATCM
On January 3, 2025, U.S. EPA granted California Clean Air Act authorization of elements of its TRU Regulation. In its action, U.S. EPA did not act on the Zero-Emission (ZE) TRU “requirements for the turnover of at least 15 percent of [the] diesel-fueled truck TRU fleet to ZETRU by December 31, 2023, (and each year thereafter)” within the 2022 TRU Amendments. CARB has withdrawn its request for the requirements of the TRU Regulation that were not acted on and is evaluating next steps. As CARB evaluates the EPA action, any resulting implementation changes will be posted here.
