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| Sustainable Aviation Fuel | |
|---|---|
| Name | Sustainable Aviation Fuel |
| Abbreviation | SAF |
| First used | 2009 |
| Governing bodies | International Civil Aviation Organization, ASTM International, European Union Aviation Safety Agency |
| Typical uses | commercial aviation, military aviation, general aviation |
| Notable producers | Neste, Gevo, Fulcrum BioEnergy, World Energy, Shell, TotalEnergies |
Sustainable Aviation Fuel
Sustainable Aviation Fuel (SAF) refers to drop-in or near‑drop-in replacements for conventional Jet fuel used in aircraft that aim to reduce lifecycle greenhouse gas emissions and other environmental impacts. Developed and commercialized by collaborations among International Civil Aviation Organization, ASTM International, European Union, Airbus, Boeing, United Airlines, Lufthansa, the fuel pool includes fuels derived from biological, synthetic, and waste-derived feedstocks produced under standards set by industry and regulators. Deployment involves stakeholders such as ICAO, IATA, Fuel suppliers, airports, airlines, airframers, military forces, fuel certification bodies, and investment banks.
SAF encompasses several defined categories such as hydroprocessed esters and fatty acids (HEFA), Fischer–Tropsch synthetic paraffinic kerosene (FT-SPK), alcohol-to-jet (ATJ), and hydroprocessed depolymerized cellulosic jet (HDCJ) that meet specifications established by ASTM International and ICAO. Types include HEFA-SPK produced by firms like Neste and World Energy, FT-SPK produced via gasification routes employed by Sasol and Shell, ATJ pathways commercialized by companies such as Gevo and LanzaTech, and emerging power-to-liquid (PtL) or electrofuel routes advanced by Sunfire, Climeworks, and Carbon Engineering. Certification categories referenced by airlines such as KLM, British Airways, Delta Air Lines, and American Airlines permit blending ratios and co-processing in existing airport fuel infrastructure.
Feedstocks span used cooking oil from sources handled by OSI Group and Sodexo, municipal solid waste processed by companies like Fulcrum BioEnergy, agricultural residues connected to John Deere equipment, energy crops investigated by INRAE and USDA, lignocellulosic biomass supplied by firms such as POET and Abengoa, forestry residues managed by Weyerhaeuser and Stora Enso, and industrial off‑gas or carbon captured CO2 from projects by Occidental Petroleum and Climeworks. Pathways include hydrotreatment (HEFA) catalyzed by licensors such as Honeywell UOP and Axens, Fischer–Tropsch synthesis developed by Shell and Sasol, gasification platforms commercialized by Air Liquide and GE Gasification, alcohol upgrading used by LanzaTech and Gevo, and electrochemical CO2 conversion piloted by Siemens Energy and Sunfire.
SAF candidates must meet physical and chemical requirements in standards from ASTM International D1655 and Annex amendments recognized by ICAO and European Union Aviation Safety Agency. Critical properties include energy density evaluated against Jet A-1 supplied at hubs like Heathrow and JFK, freezing point relevant to operations at Dubai International Airport and Heathrow, flash point pertinent to Federal Aviation Administration oversight, aromatic content influencing seal swelling tested by Rolls-Royce and Pratt & Whitney engine programs, and material compatibility assessed by Airbus and Boeing flight tests. Certification processes involve fuel testing by laboratories accredited by ASTM International committees and approvals overseen by national authorities such as Federal Aviation Administration, European Union Aviation Safety Agency, and Transport Canada.
Lifecycle assessments conducted by research groups at ICCT, IEA, IPCC, UNEP, and EPA analyze cradle-to-grave emissions including feedstock cultivation, land-use change modeled with guidance from FAO and IPCC, processing emissions tied to technologies from Siemens and Shell, and downstream combustion emissions monitored by FAA and EASA. SAF combustion emits similar NOx and particulates to conventional kerosene per studies by NASA and DLR, while well‑to‑wake CO2 reductions depend on feedstock and pathway with HEFA and FT-SPK typically delivering 50–85% reductions under certain sustainability certification scenarios administered by Roundtable on Sustainable Biomaterials and ISCC. Indirect effects such as indirect land-use change assessed by OECD and EU Commission can offset benefits; carbon accounting frameworks from GHG Protocol and ICAO CORSIA provide standardized metrics.
SAF economics hinge on feedstock prices, capital expenditure for plants by firms like Velocys and Fulcrum BioEnergy, operational costs for licensors such as Honeywell UOP, and credit mechanisms involving carbon markets administered by EU ETS and voluntary markets used by Google and Microsoft. Market players include airlines procuring offtake from producers Neste, World Energy, Gevo, and financers like BlackRock and Goldman Sachs. Scale-up challenges affect unit costs and supply chain logistics linked to Port of Los Angeles, Rotterdam, and Shanghai bunkering systems; demand signals from commitments by IAG, Cathay Pacific, Qantas, and Japan Airlines shape investment dynamics.
Policies influencing SAF include mandates and blending targets in European Union Renewable Energy Directive, incentives such as United States Renewable Fuel Standard waivers, low‑carbon fuel standards like California LCFS, and procurement frameworks adopted by UK Government and French Government. International mechanisms like ICAO CORSIA set offsetting and SAF eligibility rules, while tax credits and grants from US Department of Energy, Horizon Europe, and national agencies support demonstration projects by Sunfire, Climeworks, and Carbon Clean. Public‑private partnerships involve European Investment Bank, World Bank, and national development banks coordinating financing.
Barriers include feedstock sustainability concerns raised by NGOs such as Greenpeace and Friends of the Earth, limited refinery retrofit capacity provided by companies like TotalEnergies and Shell, logistical bottlenecks at hubs like Heathrow and Los Angeles International Airport, and price differentials versus fossil kerosene reported by IEA and BloombergNEF. Strategies to accelerate deployment emphasize long‑term offtake agreements from airlines (Lufthansa, United Airlines), public procurement by US Department of Defense and UK Ministry of Defence, blended fuel infrastructure investments at Aviation fuel farms and terminals operated by Shell Aviation and ExxonMobil, and R&D supported by Horizon Europe, DARPA, NASA, and industrial consortia including Airbus and Boeing.
Category:Aviation fuels