The rulemaking proposal promotes the production and use of alternative jet fuels, also known as sustainable aviation fuels, in Washington. These non-petroleum fuels can power airplanes while producing fewer carbon emissions. Sustainable aviation fuels can also reduce air pollution. The proposal would also strengthen incentives for investing in charging equipment for zero-emission heavy-duty trucks—a key part of Washington’s climate strategy.
Ecology is also considering other changes based on learnings from the program’s first two years, best practices used in other states, and input from groups that have expressed interest in the policy. Read the full list of changes we are considering via our rulemaking website.
This rulemaking is separate from the changes to the Clean Fuel Standard set under House Bill 1409, which will strengthen the program’s carbon intensity requirements. Passed during the 2025 legislative session, the new law requires a 45% reduction in carbon intensity by 2038, up from the previous requirement of 20%. The annual reduction in carbon intensity for 2026 and 2027 is set in statute, and Ecology expects to announce a rulemaking to incorporate targets for 2028 onward into the regulations later this year.
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Ecology proposes updates Chapter 173-424 WAC, Clean Fuels Program Rule. The rule aims to reduce the carbon emissions from transportation fuels used in Washington.
The rulemaking proposal promotes the production and use of alternative jet fuels, also known as sustainable aviation fuels, in Washington. These non-petroleum fuels can power airplanes while producing fewer carbon emissions. Sustainable aviation fuels can also reduce air pollution. The proposal would also strengthen incentives for investing in charging equipment for zero-emission heavy-duty trucks—a key part of Washington’s climate strategy.
Ecology is also considering other changes based on learnings from the program’s first two years, best practices used in other states, and input from groups that have expressed interest in the policy. Read the full list of changes we are considering via our rulemaking website.
This rulemaking is separate from the changes to the Clean Fuel Standard set under House Bill 1409, which will strengthen the program’s carbon intensity requirements. Passed during the 2025 legislative session, the new law requires a 45% reduction in carbon intensity by 2038, up from the previous requirement of 20%. The annual reduction in carbon intensity for 2026 and 2027 is set in statute, and Ecology expects to announce a rulemaking to incorporate targets for 2028 onward into the regulations later this year.
Contact Information
*Indicates Required Fields