Aluminium CBAM Costs €2.8 a Tonne: Rotterdam Premium Is the Real Bill

The European Union’s carbon border levy gets the headlines, but it is not what is inflating European aluminium bills. In 2026, the net Carbon Border Adjustment Mechanism (CBAM) liability on a tonne of primary aluminium works out to roughly €2.8. Over the same period, the duty-paid Rotterdam premium has roughly doubled.

That gap between the policy everyone discusses and the cost that actually moves is the starting point for this analysis.

As of 7 October 2026, the definitive CBAM regime has been running for about nine months. European buyers now pay several cost layers at once: London Metal Exchange (LME) prices, regional premiums, CBAM exposure and, increasingly, separate low-carbon premiums. If you misread which of those layers drives your costs, you will hedge the wrong one and negotiate against the wrong number.

Here is a clear map of which cost layers move your aluminium bill, why CBAM’s bite is small today but scheduled to grow, and where sustainability is quietly being traded away when supply tightens.

Why does the aluminium price stack matter more than CBAM alone?

The base layer is the LME cash price, recently around US$3,275-3,386/t. That is the global benchmark for primary metal. On its own, it tells you little about what a European buyer actually pays.

On top sits the duty-paid Rotterdam premium. This is the extra cost of having metal in a European warehouse with import duty settled, and the market now prices expected CBAM exposure into it. The optional low-carbon premium sits above that.

Read down the right-hand column and the CBAM layer barely registers.

The Rotterdam premium: where the volatility lives

In late 2025, Fastmarkets assessed the P1020A duty-paid Rotterdam premium at US$275-300/t, with the December contract at US$308/t on 21 October 2025. P1020A is the standard grade of primary aluminium ingot traded in Europe.

This year the premium climbed hard. Reported monthly figures, which have not been independently confirmed, put it near US$359/t in February and US$595.50/t in May; the April high is placed at roughly US$575-600/t. Part of that spike was a “war premium” tied to the Middle East conflict and risks to Gulf smelters, which eased as additional supply returned.

The doubling: The duty-paid Rotterdam premium moved from US$275-300/t in late 2025 to about US$533/t in mid-to-late September 2026.

The green premium: small, separate, and formalising

Fastmarkets put the low-carbon differential for P1020A Europe at roughly US$15-30/t in early September. That is a fraction of the regional premium, yet it is increasingly treated as its own product.

LME Insight launched a European P1020 Sustainable Aluminium Premium from its September 2026 publications. Metal qualifies at cradle-to-gate emissions of 8.0 tCO₂e/t or less, verified through LMEpassport, the exchange’s digital credentials register. Because many buyers secure low-carbon metal on long-term contracts, the spot market stays thin.

Low-carbon premium assessments are still maturing, and the methodology behind each midpoint matters because a thin spot market can make a US$15-30/t differential look more precise than it is.

What this tells you is that your budget exposure sits mostly in the regional premium and in any green differential you choose to pay, not in the carbon border levy itself.

How does the CBAM definitive regime actually work for aluminium?

Headlines describe CBAM as a carbon cost at the border. In practice, it is reported to work as a certificate obligation rather than a conventional tariff: importers surrender certificates covering the emissions embedded in the goods they bring in.

Because the mechanism operates as a certificate obligation rather than a duty, the cost an importer carries depends on emissions data and quarterly auction prices, not on the customs value of the metal itself.

Certificate prices come from the weighted average of EU Emissions Trading System (ETS) auction prices. The ETS is the bloc’s carbon market, where companies buy permits to emit. In 2026 one price applies per quarter of import; from 2027 pricing moves to weekly.

The arithmetic from gross cost to net payable runs in five steps:

1. Embedded emissions: about 1.5 tCO₂e/t of direct emissions for primary aluminium.
2. Certificate price: about €75/tCO₂, so the gross cost is roughly €112-113/t (about €112.92/t at the Q2 price).
3. Free-allocation adjustment: EU producers still receive some free permits, so importers pay only on the portion being phased out.
4. CBAM factor: that phase-out is set at 2.5% in 2026.
5. Net result: about €2.8/t.

Net CBAM cost in 2026: roughly €2.8 per tonne of primary aluminium, against a gross exposure above €110/t.

Actual liability also depends on EU benchmarks and any carbon price already paid in the producing country. Published default emission values for aluminium installations could not be confirmed, so treat the figures above as illustrative.

Scope matters too. CBAM currently covers direct process emissions only, excluding indirect emissions from electricity, which is the bulk of a smelter’s carbon footprint.

The schedule is fixed. The regime began on 1 January 2026, certificate sales open on 1 February 2027, and the first surrender for 2026 imports falls due by 30 September 2027. The factor rises over time, passing through more of the gross cost even if carbon prices stay flat.

The read you should take is that CBAM is cheap now but is a rising, scheduled cost. Pricing it into long-term contracts today is a planning decision, not a current cash problem.

Can scrap policy and sorting investment close Europe’s low-carbon gap?

If carbon pricing is not producing low-carbon metal, recycled supply looks like the obvious answer. Remelting scrap uses far less energy than smelting, so keeping scrap in Europe should feed greener supply. Fastmarkets flagged a looming green aluminium deficit in Europe as early as October 2025.

Policy path: from a proposed duty to waste shipment rules

The European Commission considered a 15% export duty on scrap. It reportedly dropped the immediate duty amid concerns from India and shifted toward measures under the revised Waste Shipments Regulation targeting exports to non-OECD countries. Adoption is expected by end-2026, or implementation in 2027, and timing has already slipped once.

The interests diverge sharply:

• Processors: Recycling Europe reportedly opposes restrictive export measures, arguing they would harm the recycling industry.
• Producers and users: European Aluminium reportedly backs measures securing long-term scrap availability and quality, while warning that restrictions can be sidestepped through intermediary countries.
• Policymakers: the Commission must balance both, knowing major destinations such as India, Malaysia, Indonesia and China reportedly already apply their own restrictions.

The sorting paradox

Retained scrap only helps if it can be upgraded. Without advanced sorting to separate alloys, Europe could simply accumulate more low-grade scrap.

Secondary aluminium supply chains depend on scrap availability, alloy quality and energy-intensive remelting, so any retained scrap only lowers carbon intensity if it can be sorted into usable grades.

Laura Roberts, Strategic Markets Editor for Base Metals at Fastmarkets, has said that investment in sorting technology to isolate alloys depends on demand for secondary aluminium.

Ross Yeo of Fastmarkets reports that processors argue export curbs would strip out the revenue that funds sorting lines. The policy designed to grow recycled supply could starve the investment that makes it usable.

For you, that means low-carbon supply depends as much on sorting economics and trade policy as on CBAM. Green premiums may stay firm whatever happens to carbon costs.

What happens to sustainability when supply gets tight?

When physical supply beats carbon credentials

Roberts has put it bluntly: for procurement teams, sustainability is a privilege and a nice-to-have.

The privilege framing: In tense markets, when buyers must secure metal, sustainability can slide down the priority list, according to Roberts.

The first half of 2026 tested that. With premiums elevated and net CBAM costs negligible, buyers had little direct financial reason to favour lower-carbon metal over available metal, though no named corporate decisions have been verified.

Sustainability tends to be deprioritised or protected under different conditions:

• Deprioritised: tight physical supply, spiking regional premiums, buying on the spot market, low carbon pass-through.
• Protected: low-carbon volumes locked in long-term contracts, comfortable supply, formal assessments such as LME’s sustainable premium.

The tiny CBAM charge does not remove the case for green premiums, because direct emissions pricing barely touches the product’s full footprint. No named long-term low-carbon offtake deals with premium terms, or recent statements from Hydro, Novelis, Constellium, CRU or Eurometal on this interaction, were found.

Cans to plastic or molded pulp: the substitution risk

At the extreme, buyers leave aluminium altogether. Yeo has cited reports of beverage companies moving from cans to plastic bottles as prices rose, though no companies or volumes have been verified. Matt Graves of Fastmarkets described a coffee capsule maker that modelled molded pulp and could revisit it if prices stay high.

Paper has limits. Fastmarkets Roundtables discussion suggests the easy plastic swaps are largely done, while items like water bottles and yogurt packs need barrier coatings that keep paper recyclable.

The conclusion is uncomfortable: green premiums survive mainly where contracts are locked and supply is comfortable, so your sustainability targets are most exposed in the next price spike.

Where the green premium goes from here

CBAM is currently a small, rising signal. Regional premiums, scrap policy and supply tightness are doing the real work on European aluminium costs and on whether buyers pay for lower-carbon metal.

The variables worth watching are the Q4 certificate price due 4 January 2027, the switch to weekly pricing and certificate sales from 1 February 2027, the Waste Shipments Regulation outcome, and how LME’s sustainable premium develops. Several data points above remain unverified, so treat them as directional.

For buyers, the decision point is timing: building rising CBAM costs and green volumes into contracts before the next squeeze, rather than during it.

Readers interested in the long-run picture can follow our deep-dive into Europe’s aluminium industry decline, which examines why regional smelting capacity keeps shrinking despite carbon policy.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Past performance does not guarantee future results. Financial projections are subject to market conditions and various risk factors.