Workshop Summary
The California Air Resources Board (CARB) invites you to participate in a virtual public workshop to discuss introducing gasoline containing up to 15 percent ethanol (E15) in California. California gasoline is currently blended with up to 10 percent ethanol by volume (E10), the maximum ethanol content allowed by the California Reformulated Gasoline Regulations. At this workshop, CARB staff will provide an overview of the scientific evaluation of E15, current regulatory requirements, and concepts for potential regulatory updates as well as additional topics regarding the use of E15 in California. Staff will seek stakeholder input through verbal feedback during the workshop and will open a public docket for written comments. That public docket will be open for four weeks following the workshop through November 11, 2025. Workshop materials will be posted to the Alternative Fuels webpage by 9:00 a.m. on October 13, 2025.
Date: October 14, 2025
Time: 9:00 a.m. – 12:00 p.m. (PDT)
Location: Virtual Zoom Meeting
Please register for the meeting. After you register, you will receive a confirmation email with information about how to join the meeting by digital/computer device or telephone on the day of the meeting.
This workshop will be recorded. Approximately two weeks after the workshop date, a link to the recording and a list of workgroup attendees will be made available and posted on Alternative Fuels webpage.
Background
CARB is responsible for adopting and enforcing motor vehicle fuel specifications, standards, and regulations to protect public health and the environment and achieve toxic criteria emissions and greenhouse gas (GHG) emissions reductions. Additionally, the California Gas Price Gouging and Transparency Law (SB X1-2) requires the development of an assessment to address the key issue of ensuring a reliable supply of affordable and safe transportation fuels for combustion vehicles in California in the context of transitioning to a zero-emission future. While California’s transportation sector is in the midst of a transition away from fossil fuels, gasoline remains California’s dominant transportation fuel. One strategy proposed to help ensure a safe, reliable, and affordable supply of gasoline is allowing an increased blending of ethanol in gasoline from E10 to E15.
Contact
If you have questions about the workshop or would like to submit comments or feedback, please contact fuels@arb.ca.gov.
If you require a special accommodation or need this document in an alternate format (i.e., Braille, large print) or another language, please email fuels@arb.ca.gov no later than October 7, 2025. TTY/TDD/Speech to Speech users may dial 711 for the California Relay Service.
Real and Increasing Costs of Climate Change Impacts for Californians
The science behind climate change is irrefutable. With the increasing severity and frequency of drought, wildfire, extreme heat, and other impacts, Californians just have to look out their windows to know that climate change is real and rapidly getting worse. The impacts once thought decades away are happening now. Recent reports detail some of the impacts to the state:
- A 2024 national report ranked California the worst state for natural disasters fueled by a changing climate, with expected annual losses totaling more than $16 billion statewide.
- Home insurance is harder and more expensive to get. Seven of California’s largest property insurers, State Farm, Allstate, Farmers, USAA, Travelers, Nationwide and Chubb recently limited new homeowners policies in the Golden State — raising questions about the stability of the California home insurance market.
- During an 11-year period, exposure to wildfire smoke caused more than 50,000 deaths in California and more than $400 billion in economic impacts.
- During seven extreme heat events over the past decade, California experienced $7.7 billion in losses.
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