Sustainable Aviation Fuel
Definition for sustainable aviation fuel (SAF)
Sustainable Aviation Fuel (SAF) refers to renewable and low-carbon alternative fuels that are used in aviation to reduce greenhouse gas emissions and mitigate the environmental impact of air travel.
SAF is produced from sustainable feedstocks and typically has a lower carbon footprint compared to conventional jet fuels derived from fossil sources.
SAF can be derived from various sources, including biomass, waste oils and fats, agricultural residues, algae, and other non-fossil carbon sources. The production process often involves advanced refining techniques such as hydroprocessing, fermentation, or thermochemical conversion to convert the feedstocks into a suitable aviation fuel.
The primary objective of SAF is to reduce the net greenhouse gas emissions from aviation. SAF offers the potential to significantly decrease carbon dioxide (CO2) emissions, as well as reduce other harmful emissions such as sulfur compounds and particulate matter. The use of SAF can help the aviation industry achieve its sustainability goals, including targets set by organizations like the International Civil Aviation Organization (ICAO).
SAF is considered a “drop-in” fuel, meaning it can be used in existing aircraft engines without requiring modifications to the infrastructure or engines. It can be blended with conventional jet fuel in various proportions, enabling a smooth transition towards greater use of sustainable alternatives.
To ensure the integrity and sustainability of SAF, there are established criteria and certifications frameworks. These include standards for feedstock sourcing, greenhouse gas emissions reduction, lifecycle analysis, and sustainability practices. Certifications like the Roundtable on Sustainable Biomaterials (RSB) or the International Sustainability and Carbon Certification (ISCC) provide assurance that the SAF meets specific sustainability criteria.
SAF is a critical component of the aviation industry’s efforts to address climate change and reduce its environmental impact. By transitioning to SAF, airlines can reduce their carbon footprint and contribute to a more sustainable and environmentally responsible aviation sector.
Sustainable aviation fuel (SAF) has emerged as a promising solution to reduce greenhouse gas emissions in the aviation industry. As the world strives to transition to a more sustainable future, the development and adoption of various types of SAF have gained significant attention. In this article, we will delve into the different types of sustainable aviation fuel, highlighting their characteristics and potential benefits.
.jpg "Hydroprocessed Esters and Fatty Acids (HEFA)")
Type of Sustainable Aviation For(SAF)
Hydroprocessed Esters and Fatty Acids (HEFA)
HEFA is one of the most commonly used types of SAF. It is produced by hydroprocessing plant and animal oils or waste fats, converting them into jet fuel. HEFA is chemically similar to conventional jet fuel, allowing it to be used as a drop-in replacement without requiring modifications to existing aircraft engines or infrastructure.
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Fischer-Tropsch (FT)
FT synthetic fuels are derived from gasification and subsequent chemical conversion of biomass or fossil resources, such as natural gas or coal. These fuels have a high energy density and lower carbon intensity compared to conventional jet fuel. FT SAF can be produced as a blendstock or as a full replacement for traditional jet fuel.
.jpg "Alcohol-to-Jet (ATJ)")
Alcohol-to-Jet (ATJ)
ATJ fuels are produced through the conversion of sugars or lignocellulosic feedstocks, such as agricultural residues or dedicated energy crops, into alcohols (e.g., ethanol) and further processing them into jet fuel. ATJ SAF offers a renewable alternative to conventional jet fuel, contributing to reduced carbon emissions.
.jpg "Production of Hydrothermal Liquefaction (HTL)")
Hydrothermal Liquefaction (HTL)
HTL involves the conversion of wet biomass, such as algae or wastewater sludge, into a biocrude oil through high-pressure and high-temperature conditions. The biocrude oil can then be upgraded to produce SAF. HTL-derived SAF offers the potential for carbon capture and utilization, utilizing waste materials while reducing greenhouse gas emissions.
.jpg "Biomass-to-Liquid (BTL)")
Biomass-to-Liquid (BTL)
BTL fuels are produced by gasifying biomass feedstocks and then converting the resulting syngas into a liquid fuel using Fischer-Tropsch or other conversion processes. BTL SAF can be sourced from a variety of feedstocks, including agricultural and forestry residues, energy crops, and organic waste, making it a versatile option for sustainable aviation fuel production.
Benefits of Sustainable Aviation Fuel
The utilization of SAF offers numerous benefits to the aviation industry and the environment. By reducing the reliance on fossil fuels, SAF can significantly lower greenhouse gas emissions, contributing to the global effort to mitigate climate change. Moreover,
SAF production stimulates the development of a sustainable bioeconomy, creating new economic opportunities, reducing dependence on fossil resources, and promoting regional development.
Sustainable Aviation Fuel (SAF) offers several benefits that contribute to a more sustainable and environmentally responsible aviation sector.
Here are some key benefits of SAF:
Greenhouse Gas Emission Reduction: SAF has a lower carbon footprint compared to conventional jet fuels derived from fossil sources. It can help reduce net greenhouse gas emissions from aviation, including carbon dioxide (CO2) emissions. The use of SAF can contribute to achieving climate change mitigation goals by reducing the aviation sector’s overall carbon footprint.
Compatibility with Existing Infrastructure: SAF is a “drop-in” fuel, meaning it can be used in existing aircraft engines without requiring modifications to the infrastructure or engines. This makes it a readily deployable solution that can be seamlessly integrated into the existing aviation fuel supply chain and infrastructure.
Improved Air Quality: SAF has the potential to reduce other harmful emissions, such as sulfur compounds and particulate matter, compared to conventional jet fuels. This improvement in air quality can have positive impacts on both local air pollution and human health, particularly around airports and heavily trafficked flight paths.
Diversification of Feedstock: SAF can be produced from a variety of sustainable feedstocks, including biomass, waste oils and fats, agricultural residues, and algae. This diversification reduces reliance on fossil fuels and promotes the development of a circular economy by utilizing waste or non-food sources for fuel production.
Job Creation and Economic Opportunities: The production, distribution, and use of SAF can create new job opportunities and stimulate economic growth in the renewable energy sector. The development of SAF industries can support innovation, research, and investment, driving economic benefits and the transition to a more sustainable energy future.
Positive Brand Image and Stakeholder Engagement: Adopting SAF demonstrates a commitment to sustainability and environmental stewardship. Airlines and aviation stakeholders can enhance their brand image, improve customer perception, and engage with environmentally conscious consumers and investors who prioritize sustainable practices.
Regulatory Compliance and International Standards: The aviation industry faces increasingly stringent regulations and targets for reducing emissions. SAF provides a viable pathway for airlines to comply with these regulations and meet sustainability targets set by organizations like the International Civil Aviation Organization (ICAO) and regional aviation authorities.
By leveraging the benefits of SAF, the aviation industry can significantly contribute to global efforts to mitigate climate change, reduce emissions, improve air quality, and transition towards a more sustainable and environmentally conscious future.
Conclusion for type of sustainable aviation fuel
Sustainable Aviation Fuel (SAF) is a renewable and low-carbon alternative to conventional jet fuels that offers several significant benefits.
By using SAF, the aviation industry can achieve greenhouse gas emission reductions, improve air quality, and support the transition to a more sustainable and environmentally responsible sector. The compatibility of SAF with existing infrastructure and engines allows for a seamless integration and deployment. Additionally, the diversification of feedstock sources for SAF production promotes a circular economy and reduces reliance on fossil fuels.
SAF not only helps airlines meet regulatory requirements and sustainability targets but also enhances brand image, stakeholder engagement, and creates economic opportunities in the renewable energy sector. Overall, SAF plays a crucial role in addressing climate change, reducing emissions, and fostering a more sustainable future for aviation.
As the aviation industry strives to reduce its environmental impact, sustainable aviation fuel (SAF) has emerged as a critical component of the solution. The various types of SAF, including HEFA, FT, ATJ, HTL, and BTL, offer promising alternatives to conventional jet fuel. By embracing these sustainable options, the aviation sector can move closer to achieving its environmental goals while fostering innovation and driving the transition to a more sustainable future.
https://www.exaputra.com/2023/05/type-of-sustainable-aviation-fuel.html
We often hear the MAGA folks claim that voting in the U.S. disproportionate favors the people in big cities, mostly along the coasts.
The obvious response: People vote, not acres of land.
And yes, it’s true that Trump has little appeal to the well-educated, highly productive people in Southern California, the Bay Area, the Mid-Atlantic, New England, other large cities like Chicago, Phoenix, Houston, and Seattle.
Weather Guard Lightning Tech
Global fleet, local knowledge: closing wind’s expertise gap
This exclusive article originally appeared in PES Wind 3 – 2026 with the title, Global fleet, local knowledge: closing wind’s expertise gap. It was written by Allen Hall and other members of the Weather Guard Lightning Tech team.
As wind fleets expand across increasingly diverse operating environments, the expertise needed to solve their problems is becoming more dispersed. Closing the industry’s knowledge gap means connecting local challenges with specialist experience from across the global wind sector and beyond.
An operator finds something on a blade they have not seen before. Who do they call? The engineer who designed that blade moved on years ago. The service provider has not seen the problem either. Somewhere in the world, there’s probably a person who has spent 15 years working on precisely that failure mode. But there’s no reliable way to find them.
That scenario plays out again and again. It’s rare that a problem is unsolvable. A solution exists somewhere. The bigger problem is finding that solution, or the person close to solving it.
Wind has become a large, geographically dispersed industry with roughly 1.3 TW of installed capacity. The technical knowledge required to keep it running has dispersed with it. The knowledge is real, deep and often highly specialized, but it is scattered across the globe in small teams working in different markets.
This is not the first global industry to discover that no single organization can hold every discipline, and that different parts of the world present different problems.
Two answers, one problem
In January 2023, Andrew Billingsley took a call from Ørsted asking whether his company could recycle wind turbine blades. Billingsley is CEO of Plaswire, a polymer processor in Northern Ireland. It was not a wind company. Plaswire’s business had been built on finding a way to use plastics from aircraft seat manufacturing and other waste nobody else would handle: residue pulled out of biodigesters and municipal waste plants.
He said yes before he was certain the company could do it.
Plaswire had a proprietary process for combining polymers that materials engineers said couldn’t be combined. Ground blade fiber mixed well with the combined polymer. Plaswire says it now has capacity to process up to 11,000 tonnes of blades a year and has increased blade content in its product from ten percent to thirty percent. The company also reports that the resulting structural components can outperform the concrete and timber alternatives they replace.
The same waste stream produced an entirely different answer on the other side of the Atlantic. Everpoint Services in Houston, Texas decommissions wind and solar assets, leaving the company tasked with repurposing fiberglass blades. At a birthday party, Everpoint CEO Tyler Goodell put that problem to James Timmins, a drilling engineer who had spent his career planning and overseeing drilling operations for major oil companies.
Timmins realized that ground blade fiber might work as a fluid loss additive in oil, gas, and geothermal drilling, where fluid escaping into the formation can cost tens of thousands of dollars a day. Everpoint spent the next two years turning that idea into a product. The company says BladeBlok is patented and shipping globally from Houston.
Two regions, two answers, both effective. And in retrospect, it makes perfect sense. Northern Ireland has decades of depth in polymers and injection molding, so its answer was a polymer. Houston is a center of the global oil and gas industry, so its answer was drilling mud. Neither answer came out of the wind industry. Both came from regional industrial expertise meeting a problem that happened to land next to it.
Looking beyond Denmark
Modern wind turbine engineering grew up in Denmark, and in many ways it still lives there. The most prevalent turbine design was refined by Danish engineers. DTU Wind and Energy Systems still anchors much of the research on wind turbines. Ask a hard aerodynamic question today and there is a fair chance the answer comes from within Denmark.
What has changed is that designing turbines and operating them are different problems. They no longer happen in the same places. A machine is designed in a small number of locations. It is then operated wherever the wind blows: West Texas, Queensland, Gujarat, the North Sea, and the Spanish meseta.
The fleet is also getting older and more varied as it grows. Machines commissioned during the last boom are aging in ways nobody modeled, on sites with conditions nobody anticipated. That combination generates operational questions faster than any single organization can answer them. Those questions are local, specific, and urgent. Now, companies all over the world are being asked to solve wind’s problems with legacy knowledge, often from an adjacent industry, that originated a long way from where the turbine was built.
The same blade, four climates
The industry’s leading-edge erosion wisdom is shaped largely by northern European conditions. It is a real problem, well studied and well understood. It is also not the same problem in West Texas, where the air carries dust and insects, and where inspections routinely find turbines one to three years old that look as though they have run for far longer. Will Howell of Armour Edge describes one site near an open-cast mine where airborne marble particulates were destroying blades within two seasons.
India produces a variant that exists nowhere in Europe. During the northern dry season, a sticky, tar-like dirt builds on the blades until the flow separates and the blade effectively stalls. The monsoon washes it away. PowerCurve reports that the use of vortex generators in India has produced some of the largest energy gains it has recorded, exceeding five percent across a full year. India is now the fourth-largest wind market on earth, surpassing 56 GW; last year it added more capacity than Germany did.
Rosemary Barnes worked for a Danish blade manufacturer before returning to Australia in 2021 to work in operations. There, she found blades behaving unlike the ones she had known in Europe. The standard method of predicting erosion severity combines annual rainfall with tip speed. But when Barnes plotted Australian sites with known erosion problems against those two axes, she got a random scatter. The model had no predictive value in Australia.
Her firm, Pardalote Consulting, is now placing scientific-grade sensors in Australian wind farms to establish what actually drives erosion there. [Barnes is also a regular host of The Uptime Wind Energy Podcast.]
A library of experts
Today, finding the right specialist can be difficult.
After six years hosting the Uptime Wind Energy Podcast, I increasingly think of the podcast as a library. In the past year alone, we’ve highlighted solutions from companies in Latvia, Denmark, Northern Ireland, Spain, Australia, Scotland, and the United States. As an organizer of the Wind O&M Australia event, one of our goals has been to bring international expertise to the local market. And similarly, to allow the global market to learn from knowledge that has been internal to Australia.
The answers are out there
The wind industry does not have time to solve the same problem twice. Fleets are aging, budgets are tight, and a blade defect that sits unresolved for a season costs real production. The pressure is to move faster, and the fastest way to solve a problem is rarely on your own. The fastest way to solve a problem is to find the person who has solved it. That search has to be a global one. The specialist who understands your failure mode may be in Copenhagen, Riga, Edinburgh, or Houston, working for a company you have never heard of. Geography is not a reason to rule them out. Increasingly it is the reason to go looking. The Uptime Wind Energy Podcast has become one way of documenting that dispersed expertise, bringing together specialists working on specific problems across different markets.
The answers are out there.
Unless otherwise noted, images here are from The Uptime Wind Energy Podcast.
Contact us for help understanding your lightning damage, future risks, and how to get more uptime from your equipment.
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Renewable Energy
Remembering Buckminster Fuller, 20th Century Super-Engineer and His Beliefs about Humanity
Fuller’s words here have been echoed through the ages, e.g., Mahatma Gandhi’s note: “The world has enough for everyone’s need, but not enough for everyone’s greed.”
The problem: Most people living in our capitalist civilization care very little about what Bucky here called “livingry.” The typical person in the developed world thinks almost nothing about starving children and even less about recasting world society into a place where we take care of the wellbeing of everyone.
He was one of the great minds that have ever graced our planet, IMO.
Remembering Buckminster Fuller, 20th Century Super-Engineer and His Beliefs about Humanity
