Platts to launch weekly calculated CBAM cost for European aluminum assessments

Platts, part of S&P Global Energy, will launch a weekly calculated value for the additional costs associated with the EU's Carbon Border Adjustment Mechanism (CBAM) for European aluminum premiums assessed on a duty-paid basis imported into the EU, effective Jan. 2, 2026.

CBAM requires importers of aluminum into the EU to purchase CBAM certificates for material imported from January 2026. Under European Commission (EC) regulation, CBAM certificates will be calculated as the weekly average auction price of the EU ETS Allowances (EUAs).

The calculation will provide additional transparency and granularity to the market through 2026, given that the requirement to purchase CBAM certificates has been delayed to January 2027, based on the most recent announcements from the EC.

Publication of the new CBAM cost for aluminum was previously proposed in a subscriber note published July 17 and available here .

Following market feedback, the calculation will use a Scope 1 industry average of 1.8 mt CO2e per mt of aluminum in place of the prevailing EC default carbon intensity (CI) default value (currently 2.36 mt CO2e per mt of aluminum for 2025). Feedback indicated that 1.8 m t CO2e per m t of aluminum will be more reflective of the market and corresponding CBAM values.

The weekly CBAM cost will be calculated using the following formula and inputs:

[Industry average CI for aluminum – (EC's prevailing benchmark CI for aluminum x CBAM ramp-up factor)] x carbon cost = Calculated aluminum CBAM cost ($/mt )

The typical CI of imported material into Europe: This will initially be 1.8 mt CO2 e per mt of unwrought aluminum, based on feedback Platts has collected from the market. This will be periodically reviewed and updated accordingly. Any updates to this figure will be communicated in subsequent subscriber notes.

The prevailing EC benchmark CI value: Platts will use the prevailing EC benchmark carbon intensity of 1.464 mt CO2e per mt of aluminum and update this figure as necessary.

The official EC multiplier for the phase out of free allowances from 2026 to 2034: In 2026, this level has been set at a 2.5% reduction (giving a multiplier of 97.5%) .

The cost per point of CI, as represented by the Platts EUA Nearest December EUR/ mt assessment weekly average (EADMP04) converted into US dollars : This is based on the expectation that all certificates will be bought relative to the EU ETS cost without differentiating based on potential origin offsets. More information on the existing weekly average of Platts EUA assessment can be found here .

For simplicity, the calculation assumes that no carbon price has been paid on production overseas.

As an example, using the Platts EU Emission Allowance Nearest-December WAvg and EUR-USD currency conversion assessments from Nov. 14, 2025, the calculated aluminum CBAM cost ($/mt):

[1.8 mt CO2e/mt of aluminum – (1.464 mt CO2e/mt of aluminum x 0.975) ] x (€80.9 8/mt x 1.1 619 00) = $35.06/mt

Platts will also launch calculated monthly and quarterly averages for the aluminum CBAM cost ($/mt ) from January 2026 and the January-March 2026 quarter.

The CBAM cost will be published at 16:30 London time on Fridays and follow the UK holiday calendar. If Friday is a non-publishing day, then the assessments will be published on the previous working day.

The calculated CBAM cost will be relevant to the Platts ' European primary aluminum and billet duty paid premium assessments previously outlined here.

Please send comments and questions to EMEAMetalsTeam@spglobal.com and pricegroup@spglobal.com .

For written comments, please provide a clear indication if the comments are not intended for publication by Platts for public viewing. Platts will consider all comments received and will make comments not marked as confidential available upon request.