• New indexes compare the cost of SAF use with carbon-market compliance across Europe, Asia and the United States.
• Daily assessments measure emissions reduction costs in US dollars per tonne of carbon dioxide equivalent and per tonne of fuel.
• An accompanying calculator lets companies model SAF procurement, Scope 3 claims, incentives and compliance obligations.

London-based Argus has launched a new set of sustainable aviation fuel emissions reduction indexes designed to clarify the cost of cutting aviation emissions.

The global energy and commodity price reporting agency said the assessments will help airlines, fuel suppliers, corporate buyers and investors compare SAF economics with carbon-market obligations.

The indexes cover Europe, Asia and the United States. They are intended to support procurement decisions, regulatory compliance and negotiations over the ownership of environmental benefits.

Argus has also introduced an Excel-based calculator. Subscribers can use it to model company-specific SAF procurement and decarbonisation strategies.

Comparing SAF with carbon markets

Argus publishes emissions reduction indexes, or ERIs, for Europe, Asia and the United States excluding the Carbon Offsetting and Reduction Scheme for International Aviation, known as Corsia.

It also publishes a European assessment excluding the EU Emissions Trading System.

The ex-Corsia indexes calculate the net cost of reducing aviation emissions through hydrotreated esters and fatty acids synthetic paraffinic kerosene, or HEFA-SPK.

That cost is then compared with the alternative of buying Corsia-eligible emissions units.

The European ex-ETS assessment compares the cost of using HEFA-SPK with the cost of meeting EU carbon-market obligations.

Both assessments account for the value of the relevant carbon compliance pathway. Argus said all calculation components come from market-based price assessments.

The approach is designed to show whether physical emissions reductions achieved through SAF remain competitive with carbon allowances or offset units.

That distinction matters as airlines face overlapping mandates, voluntary targets and customer requests for lower-emissions travel.

Standardising regional cost comparisons

The indexes normalise fuel prices on an energy-equivalent basis. They also apply regional lifecycle emissions assumptions.

Argus publishes the daily assessments in US dollars per tonne of carbon dioxide equivalent.

It also reports them in US dollars per tonne of fuel. That additional figure gives buyers greater visibility into SAF premiums and allows direct comparison with physical SAF benchmark prices.

SAF economics vary widely by region because of feedstock costs, production capacity, tax credits and blending rules.

Carbon prices and compliance requirements also differ. As a result, the same fuel pathway can produce different commercial outcomes across markets.

A consistent reference price could help companies compare those outcomes on a more transparent basis.

It may also assist investors assessing the revenue potential and policy exposure of SAF projects.

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Calculator supports company-specific decisions

The Argus calculator uses published ERIs as its starting point. Users can then add their own assumptions.

These can include regional incentives, compliance mechanisms, operating costs and lifecycle emissions data.

Companies can also test different approaches to SAF procurement and carbon compliance.

The tool supports modelling of Scope 3 negotiations, including how buyers and sellers allocate SAF costs and environmental attributes.

This is becoming a central governance issue for corporate aviation programmes.

Airlines may purchase and blend the physical fuel, while corporate customers seek to claim the associated emissions reductions. Clear accounting is needed to prevent double counting and disputes over ownership.

The calculator may help participants document those arrangements and assess how incentives or compliance schemes affect the final cost.

Argus Media chairman and chief executive Adrian Binks said: “Our new ERI assessments help aviation industry market participants understand more clearly the relationships between fuel pricing and steadily increasing mandated and voluntary carbon markets obligations. Together with the calculator, they offer a transparent and independent means of establishing the cost of emissions reduction and help participants decide how to allocate SAF costs and environmental attributes between buyers and sellers, including Scope 3 emissions reduction agreements.”

Greater scrutiny of aviation decarbonisation costs

The launch comes as governments increase pressure on aviation companies to use lower-carbon fuels.

Airlines and corporate buyers must now evaluate more than the headline price of SAF. They must also consider carbon-market exposure, emissions accounting and the value of environmental claims.

For executives, the indexes provide a new benchmark for comparing physical decarbonisation with compliance alternatives.

For investors, they may improve visibility into regional demand, policy support and project competitiveness.

The broader impact will depend on how widely the assessments are adopted. However, greater transparency could strengthen SAF contracting and make aviation emissions strategies easier to compare across global markets.