// Resources
Further reading
The sources behind the claims on this site, organised by topic. Every figure and regulatory reference on this site is traceable to a primary or otherwise authoritative source listed below.
// Regulation and policy
- Regulation (EU) 2023/2405, ReFuelEU Aviation (2023), SAF mandate schedule, synthetic-fuel sub-mandate, and shortfall penalties (Article 12).
- Directive (EU) 2023/2413, RED III (2023), 70% lifecycle reduction threshold for renewable fuels of non-biological origin (RFNBO).
- Directive (EU) 2018/2001, Renewable Energy Directive (RED II) (2018), the original definition of renewable fuels of non-biological origin (RFNBO).
- Delegated Regulation (EU) 2023/1184 (2023), RFNBO production criteria, including the renewable-grid exemption (Article 4(1)).
- Delegated Regulation (EU) 2023/1185 (2023), RFNBO lifecycle greenhouse-gas methodology.
- Directive 2003/87/EC, EU Emissions Trading System, as amended (2003), ETS framework, including the SAF price-differential support mechanism (Article 3c(6)).
- Directive (EU) 2023/958 (2023), revision of the EU ETS for aviation, including the withdrawal of free aviation allowances and the SAF support framework.
- Commission Delegated Regulation (EU) 2025/723 (2025), detailed rules for the Article 3c(6) SAF price-difference support mechanism under the EU ETS.
- EEA Joint Committee Decision 334/2023, EFTA (2023), incorporation of the ETS Directive (incl. Article 3c(6) SAF support, 100% Iceland tier) into the EEA Agreement.
- DEHSt (German Emissions Trading Authority), EU ETS aviation, emission factor (2024), the standard jet-kerosene CO₂ emission factor used to derive the ETS saving per tonne of eSAF.
- Lög nr. 106/2025 (Alþingi), amendment to the national emissions trading framework; the Article 3c(6) SAF support mechanism is not yet implemented in Icelandic law.
- EFTA Surveillance Authority, College Decision No 02626COL (11 February 2026), first EFTA-pillar SAF allowance allocation (1,970 allowances to Norwegian operators for 2024; Iceland claimed none).
- European Commission, SAF allowance allocation (September 2025), first EU-pillar allocation, about 1.3 million allowances (roughly EUR 100 million) to 53 operators.
- CINEA (European Commission), E-fuel Pilot Project factsheet, Innovation Fund ref. 101132987, EUR 40 million Innovation Fund grant to Nordic Electrofuel, Herøya, Norway.
- European Commission, EU Innovation Fund, the EU’s funding programme for innovative low-carbon technologies, open to EEA EFTA states.
- European Commission, DG MOVE, eSAF Early Movers’ Coalition (4 December 2025), eight member states committing at least EUR 500 million to bring European eSAF projects to final investment decision through double-sided auctions; H2Global Foundation, the double-sided auction model.
- European Commission, IF25 Hydrogen Auction (2026), over EUR 1.09 billion in fixed-premium support awarded to nine renewable-hydrogen projects across seven EEA countries.
- ICAO CORSIA, Carbon Offsetting and Reduction Scheme for International Aviation, default fossil comparator (89 gCO₂e/MJ) and eligible-fuels framework.
// Aviation emissions and SAF
- IEA, Aviation sector overview, global aviation CO₂ share, energy-density limits, and the role of SAF.
- Lee et al., The contribution of global aviation to anthropogenic climate forcing, Atmospheric Environment Vol. 244 (2021), non-CO₂ warming effects of aviation.
- ICAO, SAF portal, global SAF policy framework and decarbonisation potential.
- EASA, Sustainable Aviation Fuels, EU regulatory direction and SAF tracking.
- SASHA Coalition and Cerulogy, Fuelling nature (2024), biofuels for aviation and shipping put biodiversity at serious risk; e-fuels are the only solution compatible with both climate and biodiversity targets. Full report PDF.
- Greenpeace, Unhooking Europe from Oil (2022), identifies e-fuels from renewable electricity as the only acceptable alternative fuels for aviation and shipping.
- IATA, Jet Fuel Price Monitor, primary jet-fuel price data.
- ICCT, Life-cycle GHG emissions by SAF pathway (2025), lifecycle emissions compared across SAF pathways.
- ICCT, Why and how to bring down the cost of SAF (2025), SAF cost drivers and reduction levers.
- EASA, 2025 aviation fuels reference prices for ReFuelEU Aviation, Article 13 reference prices used for ReFuelEU penalties and the EU ETS SAF support mechanism.
// Iceland energy and grid
- Umhverfis- og orkustofnun (Environment and Energy Agency), Iceland grid composition, carbon intensity (approximately 70% hydro, 30% geothermal) and electricity statistics. (Successor to Orkustofnun, merged 1 January 2025.)
- Umhverfisstofnun, Environment Agency of Iceland, national emissions data, including ISAL aluminium-smelter emissions.
- Landsnet, Iceland national grid and connection.
- Hagstofa Íslands, external trade by HS chapter (UTA03801), fuel import origin, Strait of Hormuz transit share, NATO share.
- World Bank, Fuel imports as percentage of merchandise imports, Iceland, fuel-import dependency indicator.
- Carbon Recycling International, first commercial CO₂-to-methanol plant, operating in Iceland since 2012.
- Kadeco, Green Industrial Park and K64 masterplan, the project site at the former Keflavík base area.
- Carbfix, How it works and Matter et al., Science (2016), CO₂ mineralisation in basalt.
- Isavia, Keflavík Airport, transatlantic hub.
- Government of Iceland, Energy and EEA, Iceland renewable share, grid composition (about 73% hydro, 27% geothermal).
- Denholm et al., NREL/TP-6A2-45834 (2009) and Landsvirkjun, Fljótsdalur Power Station, wind-farm land use; Hálslón reservoir.
- Rio Tinto, ISAL, Iceland’s first aluminium smelter (Straumsvík, 1969).
- Icelandair Group MoU (2023) and Annual Report 2023; Cirium On-Time Performance Review 2023; Luxaviation MoU (2025) and 2024 Sustainability Report, offtaker commitments and quotes.
- CNBC, Jet fuel prices climb as Middle East conflict threatens summer flights (6 May 2026) and Euronews, the jet fuel crisis (17 April 2026), 2026 Strait of Hormuz jet-fuel price spike.
- Umhverfis- og orkustofnun, Almennar forsendur orkuspár 2025–2050 (Orkuspá, February 2026), national aviation fuel demand forecast (grunnspá: 420 kt by 2030).
- UOS-2025-4 (Umhverfis- og orkustofnun), Iceland aviation fuel sales 2024 (323,424 t; about 1,026 L/capita).
- Hagstofa Íslands, imports by HS code and country of origin, table UTA06201, jet fuel origin shares (Gulf/Hormuz over 60%, NATO about a quarter).
- Landsvirkjun, Financial Statements 2025, published average industrial electricity price (about EUR 28/MWh).
- Eurostat, nrg_pc_205, electricity prices for non-household consumers (2025 H1), peer-market industrial electricity price ranges.
- Eurostat, energy balances (nrg_bal_c, international aviation kerosene) and population (tps00001), 2024, jet fuel use per capita across Europe.
- Ember, Yearly Electricity Data (2024), grid carbon intensity by country.
- WRI, Aqueduct Water Risk Atlas 4.0, published baseline water-stress index by country.
- Iceland energy in numbers (IðunnH2 infographic), UOS-2025-4 fossil fuel sales and Hagstofa Íslands customs imports 2025, compiled.
- Hydrogen and E-fuels Roadmap for Iceland (Government of Iceland, 2024), retained-value estimate for replacing imported fuel; fossil-free-by-2040 goal.
- Hagstofa Íslands, monthly external trade of goods, 2025, jet fuel as about 4% of total import value.
- US EIA, World Oil Transit Chokepoints (Strait of Hormuz); CNBC and Euronews (2026), the 2026 jet-fuel price spike. See also 2026 Hormuz price spike.
- IEA, Sheltering From Oil Shocks (March 2026), the 2026 disruption described as the largest in the history of the global oil market; jet fuel the most exposed product.
- Þjóðaröryggisráð (National Security Council) status report, Feb 2021, as cited in Björn Bjarnason, Morgunblaðið, 12 March 2022, aviation-fuel stocks flagged as a national-security vulnerability; no 90-day strategic reserve.
- Boeing Defense, Guidance on SAF Usage for Defense Aircraft (20 July 2024), quoting James Appathurai, NATO; SAF cleared for NATO military aircraft at approved blend limits.
- OSW Centre for Eastern Studies, Fuelling defence: NATO Central Europe Pipeline System (30 July 2025), citing NATO; CEPS jet-fuel throughput about 1.45 million m³ (roughly 1.2 million t) in 2024.
- NATO, Energy security; NATO, Climate Change and Security Impact Assessment (2024), alliance energy-resilience direction.
- Government of Iceland (Stjórnarráðið), Áfallaþol á grundvelli viðmiða Atlantshafsbandalagsins, áfangaskýrsla (resilience progress report, 12 December 2025), energy access among the seven NATO baseline resilience requirements Iceland has committed to.
- Economic Policy Institute, Updated Employment Multipliers for the U.S. Economy, employment multipliers for energy and manufacturing investment.
- Statistics Iceland (Hagstofa Íslands), Tourism Satellite Accounts 2024 (tourism about 8.7% of GDP, preliminary); Ferðamálastofa (Icelandic Tourist Board), Numbers of foreign visitors (98.7% of overnight visitors by air).
- Isavia / Keflavík Airport, 2024 passenger statistics, transfer-passenger share (about 30%).
// Technology and standards
- ASTM D7566-24a, Standard specification for aviation turbine fuel containing synthesized hydrocarbons, synthetic jet-fuel specification.
- IEA, Global Hydrogen Review 2024, electrolyser capacity, efficiency, and deployment trends.
- Fraunhofer ISE, SAFari project, aireg webinar (2024), methanol-to-jet process detail, TRL assessments, co-products, and SAF yield.
- Topsoe, MTJet process, commercial methanol-to-jet technology description.
- Elwalily et al., Sustainable aviation fuel production via the methanol pathway: a technical review, RSC Sustainable Energy and Fuels (2025), peer-reviewed review of the methanol-to-jet pathway.
- Honeywell, How ASTM approval of methanol-to-jet accelerates SAF at scale (June 2026), industry reporting on the ASTM D7566 qualification of the methanol-to-jet route.
- CAAFI, ASTM D02.0J AC724 Task Force, methanol-to-jet ASTM qualification progress.
- ISCC, sustainability certification, EU and CORSIA certification frameworks (ISCC EU, ISCC CORSIA).
- Climeworks, direct air capture pilot and demonstration plants (Mammoth).
- Carbon Recycling International, George Olah plant; HIF Global, Haru Oni; INERATEC, ERA ONE, commercial e-methanol and FT-SPK demonstration plants.
- ASTM D1655, Aviation Turbine Fuels and UK Defence Standard 91-091, conventional Jet A-1 specification (AFQRJOS Joint Checklist); there is no EN aviation-fuel specification.
- Airbus, ZEROe; GreenAir News, ZEROe delay (2025); CompositesWorld, ZEROe timeline to 2040s (2025); Destination 2050, 2nd edition (February 2025), hydrogen-aircraft timeline and 2050 contribution.
- SASHA Coalition / Cerulogy, Fuelling nature (2024); RSPB, UK Bioenergy; Greenpeace, Unhooking Europe from Oil (2022), biofuel land-use and biodiversity.
- AACE International, Recommended Practice 17R-97, cost-estimate classification (Class V to Class I).
// Market and demand
- Transport and Environment, e-kerosene reports (2024 to 2026), European e-fuel pipeline data, penalty exposure, electricity demand, and policy analysis.
- SASHA Coalition, Book-and-claim to de-risk European e-SAF production (2025), targeted support to de-risk e-SAF investment within the EEA. PDF.
- IEA, The Role of E-fuels in Decarbonising Transport (2023), e-fuel demand and cost outlook.
- IEA, Direct Air Capture, DAC cost projections.
- McKinsey, Global Energy Perspective 2024/2025, energy-transition demand scenarios.
- IRENA, International Renewable Energy Agency, renewable-electricity growth and the role of e-fuels.
- ENTSO-E, Market Design and Regulatory Framework for Viable and Flexible Hydrogen Production, Executive Summary (2025), electricity as 60 to 77% of hydrogen production cost; RFNBO temporal matching tightening from 2030.
- Infinium, Announces Construction of Large-Scale eFuels Production Facility in Texas (19 May 2025), Project Roadrunner FID, 23 kt/yr.
- Brookfield to invest up to $1.1 billion in Infinium (10 September 2024), over $200M to Roadrunner, up to $850M conditional tail.
- Gasworld, Twelve secures $645M funding (September 2024), Twelve capital raise led by TPG Rise Climate.
- Taxpayers for Common Sense, Hydrogen Secured Last-Minute Win in Budget Bill (July 2025) and Norton Rose Fulbright, Effects of the One Big Beautiful Bill on Projects (July 2025), US 45V hydrogen PTC construction-start window shortened to end-2027.
- SAS, Aviation Insights No. 6: The Need for e-SAF in Scandinavia (April 2026), Nordic e-SAF demand and supply-security framing.
- New Security Beat (Stimson Center), Is China’s Sustainable Aviation Fuel Ready to Take Off? (2026); Blackridge Research, SPIC $5.85bn green hydrogen fuel investment (2024); OilPrice.com, China’s coal-to-liquids expansion (2026), China SAF and CtL.
- European Commission, Press release IP/26/629 (22 April 2026), AccelerateEU; Jørgensen statement.
- Nature Communications, Solar-driven direct air capture to produce sustainable aviation fuel (2026); IEA, Direct Air Capture; Climeworks, DAC costs.
- IEA, Breakthrough Agenda Report 2025, Power chapter; IEA, The Role of E-fuels in Decarbonising Transport (2023); McKinsey, Global Energy Perspective, renewable-cost and e-fuel demand outlooks.
- IATA, SAF Production Growth Rate is Slowing Down (December 2025), Europe’s 2030 SAF requirement (4 Mt per year) against current global production (about 2.4 Mt per year). Cited by the eSAF Market stat bar (1).
- Decarbonfuse, eSAF Takes Flight: Power-to-Liquid Tech Sparks 48% Growth, projected 48% annual eSAF growth through 2031 (industry estimate, InsightAce Analytic). Cited by the eSAF Market stat bar (2).
- GreenAir News, EU states to mobilise EUR 500M support for early-mover eSAF and European Commission, eSAF Early Movers Coalition announcement (4 December 2025), EUR 500 million mobilised by 8 member states (Austria, Finland, France, Germany, Luxembourg, Netherlands, Portugal, Spain) for the first eSAF auction in 2026. Cited by the eSAF Market stat bar (3).
- Transport and Environment, EU agrees to world’s largest green fuels mandate for aviation, Europe’s 2050 SAF requirement (43 Mt per year), up from about 2 Mt today. Cited by the eSAF Market stat bar (4).
- ICCT, Current and future cost of e-kerosene in the United States and Europe (2022), e-kerosene production-cost projections.
- Bube, Voß, Quante and Kaltschmitt (2025), Kerosene production from power-based syngas via Fischer-Tropsch and the methanol pathway, Fuel 384:133901; ICCT, Current and future cost of e-kerosene (2022), eSAF at roughly three to six times the fossil jet price for well-sited projects today.
- Seymour et al., Future costs of power-to-liquid sustainable aviation fuels produced from hybrid solar PV-wind plants in Europe, RSC Sustainable Energy and Fuels (2024), peer-reviewed PtL SAF cost projections.
- IRENA, Green Hydrogen Cost Reduction (2020), electrolyser scale-up and cost-reduction outlook.
- IRENA, Renewable Power Generation Costs in 2023 (2024), renewable electricity cost data.
- IRENA, Reaching Zero with Renewables: Biojet Fuels (2021), biojet and synthetic-fuel scaling outlook.
- Sasol, fifty years of synthetic fuel from coal and Secunda CTL (overview), commercial Fischer-Tropsch synthesis from coal since the early 1980s.
- Transport and Environment, The e-SAF market: Europe’s head start and the road ahead (June 2025) and Feedback on the Sustainable Transport Investment Plan (September 2025), European e-SAF pipeline, FID status, and announced capacity.
- World Economic Forum, with Kearney, Financing Sustainable Aviation Fuels (February 2025), SAF capacity, HEFA share, and 2030 investment need.
- Oil and Gas Journal, Majors pull back from renewable energy investments (April 2025) and BloombergNEF, Big Oil Pivots Away From Renewable Power on Low Returns (April 2024), oil-major retrenchment from renewables.
- Hydrogen Council, How hydrogen is quietly maturing into reality (November 2025), clean-hydrogen pipeline shakeout and maturation; Özlem Duyan quote.
- Frontier Economics (for eFuel Alliance, Porsche, Stihl), Challenges and suggestions for eFuel support in the EU (November 2023), cost-free policy levers that steer investment.
- dena (German Energy Agency), country-risk matrix, government and jurisdiction risk scoring; Iceland in the lowest risk category (1.5 of 3.0).
- ICAO, Environmental Protection (trends in international aviation emissions) and EASA, European Aviation Environmental Report (EAER), aviation’s share of global CO2 emissions (about 2.5%) and the projected tripling of aviation emissions by 2050; IEA, Oil Market Report (April 2026), the 2026 Strait of Hormuz supply disruption.
- Fraunhofer ISE, for H2Global / GIZ, Power-to-X Country Analysis (May 2023), green-hydrogen production costs by region.
// Cost
- EASA, 2025 Aviation Fuels Reference Prices; PwC Strategy&, From feedstock to flight (2023); Cerulogy / ICCT, Staying Aloft (May 2025), the cost multiple of eSAF over fossil kerosene and other SAF.
- Directive (EU) 2023/958, EU ETS aviation (2023) and European Commission, SAF ETS allowance allocation (2025), rising carbon price on fossil kerosene and SAF-specific allowance support.
- ICCT, Current and future cost of e-kerosene in the United States and Europe (2022) and Seymour et al., RSC Sustainable Energy and Fuels (2024), e-kerosene cost trajectory to 2050.
- PwC Strategy&, From feedstock to flight: how to unlock the potential of SAF (2023), SAF cost outlook and the point where the synthetic pathway undercuts bio-based fuel.
- IRENA, Green Hydrogen Cost Reduction (2020); IRENA, Renewable Power Generation Costs in 2023 (2024); Fraunhofer ISE, Power-to-X Country Analysis (2023), electrolyser learning rates and renewable-cost declines.
- Cerulogy (Sandford & Malins), funded by ICCT, Staying Aloft: support mechanisms for SAF in the UK and EU (May 2025) and ENTSO-E, Market Design and Regulatory Framework for Viable and Flexible Hydrogen Production (2025), electricity as the dominant share of eSAF production cost.