The Alternative Diesel Fuels (ADF) regulation is intended to create a framework for low carbon, and often times lower polluting, diesel fuel substitutes to enter the commercial market in California, while mitigating any potential environmental or public health impacts. ADFs are those alternative diesel fuels that do not have an established CARB fuel specification in place prior to January 1, 2016. Through California and federal fuel policies, consumers are beginning to see increasingly cleaner and more diverse fueling options.
More about this program
CARB has posted the Low Emission Diesel (LED) Study: Biodiesel and Renewable Diesel Emissions in Legacy and New Technology Diesel Engines, which evaluated oxides of nitrogen (NOx) and particulate matter (PM) emissions from the use of renewable diesel/biodiesel blends in legacy and new technology diesel engines.
Effective May 3, 2021
Download Form and Instructions
Certifications and Exemptions
The reporting and recordkeeping requirements of the Alternative Diesel Fuels (ADF) Regulation requires regulated parties to report produced, imported, and blended amounts of all biodiesel blendstock and the biodiesel blends produced. Visit ADF Reporting for more information and to download the latest version of the ADF reporting form for all reporting beginning January 1, 2018. Completed reports may be submitted to the ADF Email.
Alternative Fuels Data Center
Renewable Fuel Standard Program
Division of Measurement Standards