Aluminum near four-year high of $3,520 a metric ton as Hormuz closure, China's output cap and tariffs tighten supply: 2026 outlook

London Metal Exchange aluminum closed near $3,521 a metric ton on May 1, 2026, a four-year high, up about 1.5% over the past month and more than 44% from a year earlier.

The rally follows the closure of the Strait of Hormuz, which has cut Gulf supply, and comes as China's production cap binds and U.S. tariffs and the European Union's carbon border charge reshape trade flows.

Metal Sentinel's aluminum price API publishes live LME-tracked aluminum quotes, historical series and base metal benchmarks through a single REST API.

1. Where aluminum prices stand

The May 1 close is the highest since the period after Russia's 2022 invasion of Ukraine. Other indicators:

• The LME cash-to-three-month spread is in its widest backwardation since 2007, a sign of physical tightness.

• LME-registered aluminum stocks have fallen to multi-month lows.

• The 2026 global primary aluminum balance has moved from an expected surplus to a forecast deficit of 360,000 to 570,000 tons, depending on the forecaster.

• U.S. Midwest premiums are above $500 a ton, and delivered North American aluminum costs about $5,200 a ton, nearly double the LME price, under the 50% Section 232 tariff.

2. The Hormuz closure

The near-total closure of the Strait of Hormuz began in late February and had lasted more than 55 days as of late April. The Persian Gulf accounts for about 9% of global primary aluminum supply and close to 25% of supply outside China.

Emirates Global Aluminium has said it will take at least a year to restore full capacity after damage to its United Arab Emirates operations. Aluminium Bahrain, known as Alba, has suspended operations.

Restarting a frozen potline costs hundreds of millions of dollars, so restoring capacity will take several quarters even after hostilities end.

The closure affects prices in two directions. Higher Gulf gas, freight and insurance costs raise smelter costs, and aluminum is the most energy-intensive base metal. Brent crude above $100 a barrel is also delaying Federal Reserve rate cuts and strengthening the dollar, which weighs on dollar-priced metals.

3. Three structural forces

3.1 China's 45 million ton cap

China produces about 58% to 60% of global primary aluminum. Beijing introduced a 45 million ton annual production cap in 2017 as part of energy and carbon controls, and output is now at the cap, which the 2025-2027 Action Plan reaffirmed.

BCA Research and Shanghai Metals Market have both noted that this ends an expansion that supplied more than 80% of global primary aluminum supply growth. Future demand growth must be met by higher-cost or more energy-sensitive regions.

3.2 Tariffs and CBAM

The U.S. 50% Section 232 tariff on aluminum imports has pushed delivered North American costs to about double LME prices, diverting Canadian supply to Europe and widening the Midwest premium.

The EU Carbon Border Adjustment Mechanism, in full effect in 2026, could raise the imported cost of high-carbon primary aluminum by up to 70%, shifting trade toward hydro-powered smelters in Norway, Iceland and Canada.

Together the two regimes have split the market into three pricing tiers: LME basis, Midwest delivered and CBAM-adjusted European delivered.

3.3 Demand has shifted higher

Aluminum content per electric vehicle continues to rise as automakers cut weight. Solar racking, wind turbine components and high-voltage direct current transmission use aluminum at scale, and bus bars, cooling racks and framing for data centers have become a new source of demand.

Aluminum's discount to copper has also driven substitution in electrical applications while copper trades above $12,000 a ton. Global demand of 72 million to 74 million tons a year is projected to grow 3% to 4% a year through the decade, with a deficit of about 140,000 tons in 2026 after a larger 2025 shortfall.

4. Forecasts for the rest of 2026

Fastmarkets' base case is an average of about $2,918 a ton for 2026. The International Aluminium Journal expects the LME cash price to stay above $3,000 a ton through 2026 and 2027. The World Bank's April 2026 Commodity Markets Outlook projected commodity prices will rise 16% in 2026, the first annual increase since 2022, with aluminum, copper and tin reaching record annual highs.

The bear case depends on a confirmed reopening of Hormuz and faster-than-expected startup of Indonesian smelting capacity from Adaro Minerals and Inalum, whose volumes remain small relative to the lost Gulf tonnage.

5. Effects across the supply chain

Physical buyers face elevated and volatile prices and regional premium risk on top of LME exposure. Traders see backwardation and falling stocks, with positioning that could unwind 5% to 10% on a de-escalation headline.

EU and U.K. chemical and steel manufacturers have imposed surcharges of up to 30% to offset electricity and feedstock costs, and some analysts warn of permanent deindustrialization in the most energy-intensive segments. Those surcharges are expected to reach aluminum buyers' contracts within one to two quarters.

6. Data for tracking the market

Metal Sentinel's aluminum price API returns live aluminum, copper, nickel, lead, zinc and precious metal prices in more than 180 currencies through /api/metal-quote, daily history through /api/metal-history, point-in-time comparisons through /api/historical-points, exchange rates through /api/forex-quote and equity data for Alcoa, Norsk Hydro, Rio Tinto and Century Aluminum through /api/get-stock. The Metal Sentinel widget embeds live pricing without code, and the copper price API covers the substitution side.

7. Five things to watch through the third quarter

1. Hormuz status. A confirmed, durable reopening is the largest bearish catalyst.

2. EGA and Alba restart timelines, through quarterly investor disclosures.

3. Indonesia's 2026 mining quota and new smelter startups.

4. CBAM enforcement details, particularly on indirect emissions and default values.

5. China's response to the binding cap. Beijing could relax it for production from renewable energy, which would add 2027 supply.

8. Summary

Supply constraints from China's cap, Gulf damage, energy costs at Western smelters, CBAM and U.S. tariffs are meeting rising demand from electric vehicles, renewables and data centers, a shift the Hormuz closure accelerated.

This article is for informational purposes only and does not constitute investment advice. Price levels referenced are indicative LME three-month or cash benchmarks at time of publication. Always conduct your own analysis and consult qualified professionals before making trading or hedging decisions.

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