Amendment to frequency and timing window of US low-carbon aluminium differentials: pricing notice

After a 30-day consultation period, Fastmarkets will lower the frequency of its assessments for MB-AL-0389 aluminium low-carbon differential P1020A, US Midwest and MB-AL-0390 aluminium low-carbon differential value-added product US Midwest. Fastmarkets will also extend the timing window of these assessments to include any transaction data concluded within up to 18 months.

The first amendment decreases the differentials’ publishing frequency to once monthly from once weekly. Both differentials will be next assessed on January 3, 2025, and on the first Friday of each month thereafter. The monthly frequency matches Fastmarkets’ low-carbon aluminium differentials in other regions and better reflects current market liquidity. No feedback was received during the consultation period, which began on November 21.

The second amendment extends the timing window to include any transaction data concluded within up to 18 months, from three months previously. The extension of the timing window will allow for an inclusive approach to an evolving low-carbon marketplace, allowing Fastmarkets to capture all reported transaction data under one robust differential. No negative feedback was received during the consultation period.  

The new specifications for the differentials will be as follows (changes in italics):

MB-AL-0389 Aluminium low-carbon differential P1020A, US Midwest, US cents/lb
Carbon limit: 4tCO2e per tonne of aluminium produced, Scope 1 and 2 emissions.
Quality: P1020A or 99.7% minimum Al purity (Si 0.10% max, Fe 0.20% max). Ingot, T-bar, sow
Quantity: Min 100 tonnes
Location: Delivered consumer works Midwest, differential on top of P1020A premium and exchange-listed aluminum price.
Unit: US cents per pound
Timing: Up to 18 months
Publication: Monthly, first Friday of the month, 3-4pm London time.

MB-AL-0390 Aluminium low-carbon differential value-added product, US Midwest, US cents/lb
Carbon limit: 4tCO2e per tonne of aluminium produced, Scope 1 and 2 emissions.
Type: Extrusion billet, primary foundry alloy, wire rod, slab
Quantity: Min 100 tonnes
Location: Delivered into US Midwest region, differential on top of value-added product premium and exchange-listed aluminum price
Unit: US cents per pound
Timing: Up to 18 months
Publication: Monthly, first Friday of the month, 3-4pm London time.

These prices are a part of the Fastmarkets base metals package.

To provide feedback on this price, or if you would like to provide price information by becoming a data submitter to this price, please contact Yasemin Esmen by email at pricing@fastmarkets.com. Please add the subject heading “FAO: Yasemin Esmen, re: US low-carbon aluminium differentials.”

Please indicate if comments are confidential. Fastmarkets will consider all comments received and will make comments not marked as confidential available upon request.

To see all Fastmarkets pricing methodology and specification documents, go to https://www.fastmarkets.com/methodology.

What to read next
Fastmarkets is inviting feedback from the industry on the pricing methodology for its PIX Packaging Europe indices as part of its announced annual methodology review process.
Fastmarkets invited feedback from the industry on the pricing methodology for its steel hot-rolled coil index, domestic, exw Northern Europe, €/tonne (MB-STE-0028) and steel hot-rolled coil index, fob mill US Midwest, $/cwt (MB-STE-0184), via an open consultation process between March 25 and April 27, 2026.
The publication of the alumina index adjustment was delayed by 31 minutes and the publication of the inferred alumina prices was delayed by 48 minutes. The following prices were affected: MB-ALU-0003 Alumina index adjustment to fob Australia index, Brazil, $ per dmtMB-ALU-0010 Alumina index inferred, fob Brazil, $ per dmtMB-ALU-0018 Alumina index inferred, fob India, $ per tonneMB-ALU-0019 Alumina […]
This consultation, which was open until April 30, sought to ensure that our methodologies continue to reflect the physical market, in compliance with the International Organization of Securities Commissions (IOSCO) principles for Price Reporting Agencies (PRAs). This includes all elements of our pricing process, our price specifications and publication frequency. The price under review was:MB-IRO-0004 […]
Fastmarkets invited feedback from the industry on its pricing methodologies and product specifications for softwood wood products from March 31 through April 27 via an open consultation process. This consultation was done as part of our published annual methodology review process.
The rationale for MB-CU-0287 copper concentrates TC index, cif Asia Pacific had erroneously stated that “The copper VIU was $0.18/t on May 1, up from $0.94/t on April 17.” This has been corrected to “The copper VIU was $0.18/t on May 1, down from $0.94/t on April 17.” The published price is unaffected by this change. These prices […]