An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Renewable Fuel Standard Program

Cellulosic Waiver Credits under the Renewable Fuel Standard Program

Cellulosic fuels have not yet been produced in sufficient amounts to satisfy the volume levels listed in the Clean Air Act. The law allows EPA to reduce the required volume of cellulosic biofuel through waiver.  EPA has used this waiver provision each year since 2010.

Under this provision, EPA may reduce the volume of cellulosic RINs required by instead offering obligated parties cellulosic waiver credits (CWCs) at levels no greater than the reduced cellulosic biofuel standard. These waiver credits may be purchased at prices EPA sets using the methodology in the statute.  Credits cannot not be traded or banked for future use.  They must be used to meet the cellulosic biofuel standard for the year that they are offered.

Learn more about the Cellulosic Waiver Credit Price and Minor Amendments April 2015 Direct Final Rule.

Learn more about the annual cellulosic waiver credit prices and credits purchased under the RFS program.

Cellulosic Waiver Credit Form