What happens to aluminium when supply, energy and carbon collide: A market simultaneously facing scarcity, costs and power risks

One of the heaviest and most impactful events in the global aluminium market is the enforcement of China’s 45 million tonne primary aluminium production cap. For nearly two decades, the global balance between supply and demand was shaped by China’s relentless capacity additions, with domestic output rising from 12.6 million tonnes in 2007 to nearly 45 million tonnes by the end of 2025. By early 2026, however, that expansionary phase had effectively ended. The 45 million tonne ceiling, introduced in 2017 to curb chronic oversupply and align the sector with energy and carbon goals, has become a hard limit.

By the second quarter of 2026, China’s operating capacity will be over 45 million tonnes, with utilisation rates above 97 per cent. That leaves very little room for further domestic growth.

Instead of being the world’s incremental supply provider, it is increasingly acting as a domestic balancer and, in some cases, a net importer of primary aluminium. Net exports of primary aluminium from China have already fallen by around 700 thousand tonnes year-to-date in early 2026, creating a supply gap in international markets that had previously been filled by the Chinese surplus.

The cap has also triggered a change in corporate strategy. Chinese aluminium majors, unable to expand freely at home, are exporting capital to Southeast Asia, especially Indonesia, in search of new smelting capacity. Even within China, expansion is now tied to ‘capacity replacement’, where new units can only come online if equivalent high-cost, carbon-intensive capacity is shut elsewhere.

And that has pushed the industry toward provinces such as Yunnan, where hydropower is more readily available, but it has also introduced a new risk, i.e. seasonal hydropower shortages. In 2026, drought conditions and weather-dependent electricity are themselves becoming supply-side risks.

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Indonesia’s downstream push is colliding with physical reality

If China is running into a ceiling, Indonesia is running into the limits of scale. The country’s policy to ban raw bauxite exports and force domestic refining and smelting was meant to build a new industrial base. It has succeeded in attracting capital, but in 2026, the scale of the project pipeline has become so large that even state-owned PT Inalum is calling for a moratorium on further alumina refinery and smelting expansion.

The numbers explain why. If all approved projects are completed, Indonesia’s alumina capacity would rise to over 29 million tonnes annually, up from a 2025-2026 baseline of 9 million tonnes. Smelting capacity would jump to 14.9 million tonnes from just 1.13 million tonnes, while bauxite demand would climb to 94 million tonnes from 36 million tonnes. Electricity demand would rise from roughly 16-20 TWh to 194-224 TWh.

In addition to being a rapid growth, it is also a strain on the country’s entire industrial base. At 94 million tonnes of annual bauxite extraction, Indonesia’s proven reserve base of 2.9 billion tonnes would last only about 10 years, even though the refineries and smelters under development are designed for roughly 30 years of service life.

The power requirement is even more difficult to ignore. Producing 14.9 million tonnes of aluminium per year would need as much as 194-224 TWh of electricity, compared with Indonesia’s current national generation capacity of just 150-170 TWh.

The aluminium sector alone could require more electricity than the country currently produces. That leaves little room for other industries or residential demand, and makes project delays or cancellations increasingly likely.

Guinea is tightening control just as the supply chain leans on it more heavily

Guinea remains an important source of bauxite for the aluminium chain, but 2026 has brought a sharper state grip on the sector. After the government’s 2025 campaign to clean up the mining registry, 51 mining licences and 129 exploration permits were revoked.

The biggest development came in May 2026, when Guinea and Emirates Global Aluminium settled their dispute over the Guinea Alumina Corporation concession. The dispute had escalated in 2024 when exports were suspended to push EGA toward domestic refining, and EGA later impaired the asset by USD 680 million in July 2025. The May 6, 2026, settlement transferred the assets to the state-backed Nimba Mining Company and allowed bauxite trade to resume.

But the dispute is only one part of the wider picture. Guinea is still facing very large arbitration claims, including Axis Minerals’ USD 28.9 billion claim after its permit was revoked and Falcon Energy’s USD 100 million claim.

Simultaneously, the country has tightened export rules to reduce annual bauxite exports to about 150 million tonnes, down from 183 million tonnes produced in 2025. The aim is to support domestic value addition and lift prices, which fell to four-year lows of USD 32-USD 38 per tonne in early 2026.

For the rest of the supply chain, especially Chinese refineries that depend on Guinea for more than 60 per cent of imported bauxite, the consequences are direct.

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CBAM is turning carbon intensity into a pricing weapon

On January 1, 2026, the European Union’s Carbon Border Adjustment Mechanism entered its definitive phase, and aluminium exporters are now facing a fundamentally different trade regime. Importers into the EU must account for embedded emissions in primary and semi-finished aluminium and purchase carbon certificates accordingly. In the first week alone, 10,483 import customs declarations for CBAM goods were validated, showing how large the compliance apparatus already is.

The financial burden varies dramatically by production method. With CBAM certificates priced at EUR 75.36 per tonne of CO2 in Q1 2026, coal-powered smelters with carbon intensity near 15 tonnes of CO2 per tonne of aluminium face an added cost of USD 1,300-USD 1,500 per tonne. Natural gas producers face a cost of USD 600-USD 800, hydro-powered smelters USD 175-USD 350, and renewable inert-anode producers less than USD 45.

Chinese producers, many of whom operate with carbon intensities above 15 tonnes of CO2 per tonne of aluminium, are at the sharpest disadvantage. Industry reports estimate that between USD 8 billion and USD 12 billion of annual Chinese aluminium exports to Europe are exposed to this cost pressure. Low-carbon producers in Norway, Canada and Iceland are gaining share and premiums as green aluminium becomes a requirement rather than a preference in EU supply chains.

And CBAM is only beginning. On April 10, 2026, the European Parliament’s environment committee recommended widening coverage to 180 additional aluminium and steel-based products, including extrusions and assembled goods, by January 1, 2028.

Supply shocks in Mozambique and Iceland are tightening a market already short on flexibility

The supply picture has tightened further because of major operational disruptions. In Mozambique, South32 placed Mozal on care and maintenance from March 15, 2026, after six years of failed negotiations to secure a long-term electricity contract. Mozal, South32’s largest industrial asset in the country, accounted for nearly 30 per cent of its aluminium output in 2025 and removed about 250,000 tonnes of annual supply when it shut. The shutdown also hit Mozambique’s economy hard, with Mozal contributing an average of 49 per cent to manufacturing GDP.

Iceland faced its own shock when electrical equipment failure at Century Aluminium’s Norðurál smelter in Grundartangi in October 2025 idled two-thirds of its 320,000 tonne-per-annum capacity. That removed roughly 213,000 tonnes of annual European supply and pushed premiums to one-year highs of USD 356 per tonne.

Recovery has been quicker than expected as Century announced in April 2026 that it had energised the first pots in the second potline, with close to full production expected by the end of July 2026.

The wider issue is electricity. Smelters are now competing with AI data centres for long-term baseload power, and the pricing gap is stark. AI operators can pay more than USD 115 per MWh, while aluminium smelters typically need contracts closer to USD 40 per MWh to remain competitive. That has helped keep about 800,000 tonnes of capacity offline in the US and Europe.

Novelis fire losses show how fragile the downstream supply has become

The downstream sector has not been spared. Novelis’ Oswego facility in New York suffered two fire incidents in late 2025 in the hot mill area, disrupting a plant that supplies an estimated 40 per cent of the US automotive aluminium sheet market.

The financial damage widened sharply in 2026. Hindalco initially estimated a cash flow hit of USD 550-650 million, but by February 2026, revised that to USD 1.3-1.6 billion. The updated estimate includes repair costs, downtime, working capital effects and higher sourcing costs during recovery. Shipment losses were also revised upward to 150-200 thousand tonnes.

The damage went beyond Novelis itself. Stellantis paused Warren Truck Assembly for three weeks, Ford halted production at three plants, including Kentucky Truck, and the industry was forced to juggle supply around constrained availability. Hindalco’s USD 750 million equity infusion in December 2025 underlined how serious the disruption became.

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The market is now pricing in a deficit

Taken together, these developments have pushed the global aluminium market into a volatile phase. JP Morgan’s April 2026 update projected a 1.9 million-tonne deficit for the year, driven in part by a 2.4 million-tonne hit to Middle Eastern supply. Wood Mackenzie sees a deficit of as much as 3 million tonnes in 2026, with global output expected to fall by 3 per cent.

Price forecasts have moved higher in response. JP Morgan sees aluminium at USD 3,500-4,000 per tonne, Morgan Stanley’s bull case sits at USD 3,700, and Wood Mackenzie is forecasting USD 3,700-USD 3,800. Even the World Bank’s USD 3,200 target and IndexBox’s USD 3,400 view reflect a market that is expected to remain under pressure.

As for the physical market, main Japanese Ports and European duty-paid premiums are climbing sharply, with Q3 settlement quotes expected to surpass USD 400-650 per tonne in some regions. Inventories are at their lowest levels since 2020, covering only a few days of global consumption, while spot markets are in steep backwardation.

Demand, meanwhile, has not disappeared. Construction may be soft, but aluminium demand tied to solar PV frames, EV components and grid upgrades continues to grow. Aluminium consumption to rise at 3-4 per cent annually over the next decade, reinforcing its status as a strategic energy-transition metal rather than just another cyclical industrial commodity.