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Advanced Biofuels Basics

What are advanced biofuels made of? How are they different from regular biofuels?

Advanced biofuels are defined by federal law as renewable fuels, other than corn starch ethanol, that achieve at least 50% lifecycle GHG emissions reductions compared to a 2005 fossil-based fuel baseline. Corn ethanol by law cannot qualify as an advanced biofuel.

Most of ABFA’s member companies provide fuels for use beyond the passenger vehicle space. End users of advanced biofuels often include mid- or heavy-duty transportation, including trucks, planes, and marine vessels. Even as passenger vehicles electrify, the use of advanced biofuels in the light duty fleet is absolutely critical to achieve future net zero goals.  Hard to electrify sectors, like trucks, planes, and boats will also need to transition to advanced biofuels to achieve net-zero within the transportation sector.

Generally, advanced biofuels are produced by one of three types of feedstocks:

  • Fats, oils, and greases – ranging from agricultural products like soybean oil, or oil produced using specialty grasses and cover crops, to tall oil and used cooking oil
  • Cellulosic material – cellulosic feedstocks include municipal solid waste, wood, and agricultural residues
  • Gaseous waste streams – renewable gases can be sourced from wastewater treatment plants, bio-digesters, landfills, and industrial facilities via carbon capture
How are advanced biofuels distinct from first generation biofuels, like corn-based ethanol?

Advanced biofuels are derived from lignocellulosic biomass, nonfood crop feedstocks, agricultural and forest residues, and industrial waste.

First generation biofuels like corn-based ethanol are not a one-to-one replacement for gasoline, diesel, and jet fuels, and lack the environmental potential of advanced biofuels. Ethanol, and other simple yet widely used biofuels, can reduce greenhouse gas emissions by 19-48% compared with gasoline. This is compared to advanced or cellulosic biofuels, which deliver at least a 50% reduction in greenhouse gas emissions, and many of them deliver a reduction of 80%.

What kinds of fuels qualify as advanced biofuels?

There are a wide range of fuels that can qualify as advanced biofuels, and these fuels can often provide innovative low-carbon solutions for specific use cases. The primary requirement is that any advanced biofuel attain a minimum 50 percent reduction in greenhouse gas emissions compared to the fossil based fuel it replaces. Many of these advanced biofuels are also fungible in existing infrastructure, allowing distribution and use without requiring any changes to the supply system.  These are commonly termed  “drop in” fuels. Examples of both drop-in and other advanced fuels that can be produced and/or blended include:


  • Renewable diesel
  • Biodiesel
  • Renewable heating oil
  • Sustainable aviation fuel (SAF)


  • Cellulosic and sugarcane ethanol

Specialty fuels

  • Isobutanol
  • Dimethyl Ether
  • Naphtha
What is the Renewable Fuels Standard? Why is it important?

Congress enacted the Renewable Fuel Standard, first in 2005 and an updated version in 2007, to increase American energy independence, reduce greenhouse gas emissions, and boost the U.S.’s rural economy. The program, which mandates that oil companies blend a certain amount of renewable fuel into the transportation fuel supply annually, has successfully built an American advanced biofuels industry and helped America move toward each of these objectives.

The program has a multi-purpose design. It increases the development and production of renewable fuels from both crop and non-crop based feedstocks, supports the rural economy through the use of agricultural products, reduces greenhouse gases by delivering lower carbon fuels into the liquid transportation fuels system, and increases domestic energy security.

The RFS was most recently updated in June 2023 and established biofuel volume requirements through 2025. While the ruling acknowledged the progress the advanced biofuel industry has made, it undervalued the sector’s production potential.

How could the RFS program be improved to encourage more rapid deployment of low-carbon fuels?

Without any statutory changes, EPA could tweak the RFS program to better incentivize and reward better-performing fuels. By statute, advanced biofuels must deliver 50% or more GHG emissions reductions compared to a 2005 fossil-based baseline. However, many of ABFA’s members produce fuels that far exceed those minimum levels of carbon reduction, and EPA could modify the RFS program to better reward those reductions.

EPA has at its disposal a number of regulatory options to achieve this goal. For example, the Agency could provide additional compliance credit value for better performing fuels, drop-in fuels, or sustainable aviation fuel. Additionally, the Agency could expedite review and approval of more low-carbon fuel pathways for both new feedstocks and technologies to enable more RFS-compliant production of low-carbon renewable fuels.

While the most recent update to the Renewable Fuel Standard in 2023 acknowledged the progress the advanced biofuels industry has made and moved U.S. policy towards a more technology neutral approach, it still undervalued the sector’s production potential. As emissions continue to rise it is more important than ever that the next RFS update fully supports the advanced biofuels industry. In the meantime, policy makers can send a consistent signal through tax credits and funding opportunities to help fill in the gaps created by the RFS.

What changes can EPA make to increase the feedstocks available for low-carbon fuel production?

ABFA’s first priority on this subject is advocating EPA rescind its current policy that prohibits the use of “biointermediate” feedstocks under the RFS program. Biointermediate feedstocks are derived from RFS-compliant feedstocks, partially converted at one facility, then transferred to another facility to be processed into a finished fuel. Under EPA’s current regulations, the act of moving this fuel from one place to another in an intermediary form prevents the fuel from generating RIN credits under the RFS program. If EPA were to remove this impediment, the industry would be able to upgrade biomass products and qualified wastes into biointermediates, then transfer those products to existing refineries or biofuel conversion facilities to be finished into drop-in fuels such as renewable diesel, jet fuel, or gasoline.

Additionally, ABFA has urged EPA to alter its regulations around wood residues. Currently, the regulations require tracking procedures for wood products that are incompatible with existing industry practices. Small changes to these regulatory requirements to permit the use of approved feedstocks, such as wood residue, on an aggregate basis using a mass-balance approach, would make millions of tons of available feedstock available for use under the RFS.

Who does the Advanced Biofuels Association (ABFA) represent?

Founded in 2006, ABFA’s membership has grown over the last fifteen years to include companies that represent the full value chain of advanced biofuel production, blending, and distribution. From some of the world’s largest companies to small start-ups and technology providers, the organization’s strength comes from its members’ diversity within the fuel economy.

Our membership collectively represents production of billions of gallons of advanced biofuels annually. Our ranks include some of the largest producers of fuel in the world and some of the world’s largest renewable diesel, biodiesel and heating oil producers, alongside their national distributors.

What is ABFA’s role in combatting climate change?

The members of the Advanced Biofuels Association collectively recognize the significant and growing challenge the world is facing from the impacts of climate change. Biofuels are needed to meet our carbon reduction goals, particularly in certain sectors where electrification is less well-suited. We welcome the responsibility and opportunity to be part of the solution as many of the world’s most innovative low-carbon liquid transportation fuel companies.

Indeed, we are firm in our belief that there is no one-size-fits-all solution for this global issue of reducing carbon emissions. Electrifying light-duty vehicles will make a significant contribution, but other transportation sectors – especially heavy-duty trucks, non-road vehicles, aviation and shipping – will require a different approach. The fuels of the future must also deliver the required power, range, and performance without sacrificing safety. To put it succinctly: we will need low-carbon alternatives for the full suite of liquid fuels.

While our goal is an all-of-the-above approach and we are fuel agnostic, ABFA recognizes a unique opportunity for advanced biofuels to help reduce emissions from those fuels hardest to electrify to provide low carbon transportation fuels for our future. By rewarding behavior in every sector — energy, electricity, autos, agriculture, and manufacturing — we believe we can find the solutions of the future to reduce the threats of climate change in the future of the world.

What is the longer-term goal for your membership in terms of volumes of fuels moving forward?

In 2021, ABFA sponsored a third-party feedstock study which explored the availability of feedstocks that would be available to expand the production of Biomass-based fuel over the next 10 years. We set a target goal by 2030 of 9 billion gallons of biodiesel, renewable diesel, and renewable aviation fuels, referred to as SAF or sustainable aviation fuels. The study quantified that there is ample approved feedstock available from fats, oil, and greases to produce 9 billion gallons of fuels for use in the Biomass Based Diesel pool by 2030.  The study excluded all required food use to determine whether enough feedstock existed to reach this goal without impacting the world’s food demand from these feedstocks. Longer term, it is anticipated that supplies from approved feedstocks would be able to support near 18 billion gallons by 2040 — all capable of achieving a minimum of a 50% carbon reduction as compared to the petroleum based diesel and aviation fuels.

As we move forward in time beyond 2035, what other feedstocks or technologies do you see contributing to the volume of low carbon fuels?

As we move forward, new conversion technologies will emerge to support reducing the overall carbon intensity of our fuels. This will enable us to convert a wider array of feedstocks such as gaseous emissions from industrial facilities and current ethanol production into renewable gasoline and jet fuel through fermentation, chemical, and catalyst conversion techniques. Expanding the opportunities will allow us to produce and blend even larger volumes of low carbon fuels to significantly lower the carbon footprint. As the population of the world expands and the need for energy and food increases, it will be imperative to consider all avenues to not only supply the products, but for them to have significantly lower carbon intensity – including those for aircraft, Offshore Marine trade, and heavy duty trucks utilized which are critical for moving all of the world’s goods.

How does the ABFA plan to affect these changes?

In the short term, the EPA has authority under the existing statute to make the changes necessary to achieve these goals. The removal of the bio-intermediates impediment, reviewing additional pathway submissions, allowing for additional feedstock apportionment provisions, and approval of supportive alternative test methods to consider conversion validation are all supportive under the existing law and would support appropriate flexibility to move this program forward enabling the expanded production and use of lower CI fuels.

What is SAF?

Sustainable Aviation Fuel, or SAF, is an alternative fuel designed to decrease emissions in air travel. The aviation sector has set the ambitious goal of using SAF for 100% of its fuel requirements by 2050. SAF production is the fastest growing renewable fuel and the most frequently produced sustainable fuel by ABFA members.

What is Climate Smart Agriculture?

Climate smart agriculture encompasses farming practices designed to reduce emissions while enhancing crop yields and resiliency. These practices are increasingly being deployed by farmers across the country given their benefits to revenues and agricultural productivity. Some of these methods include:

  • Multi-cropping/cover cropping
  • Nutrient management
  • Water management
  • Adjusting crop choices
  • Low-till/no-till
  • Soil carbon

ABFA’s members support climate smart agriculture and are actively encouraging the use of these practices in their production processes.

What are RINs?

Renewable Identification Numbers (RINs) are credits utilized for compliance under the Renewable Fuel Standard (RFS) program, often dubbed the program’s “currency.” When a company produces any number of gallons of applicable renewable fuels, it generates a corresponding number of RINs. Companies have the option to buy and sell RINs to other parties to meet their obligations under the RFS.