The Gulf produces roughly 8–9% of the world's primary aluminum and 18% of all exports outside China. When Iranian strikes in late March 2026 knocked out two of the region's largest smelters — Emirates Global Aluminium's Al-Taweelah and Aluminium Bahrain (Alba) — the market lost capacity it cannot replace quickly. (FACT: Reuters, April 2, 2026) Al-Taweelah is completely out of action after damage to its power plant. Alba is down to 30% capacity. Qatalum in Qatar curtailed 60% of its output to preserve raw material stocks. Combined, these three facilities represent roughly 570,000 tonnes per year of lost production. (FACT: Reuters, March 19, 2026; ING, April 17, 2026)
The supply shock is compounded by a logistics trap. Gulf smelters hold only 3–4 weeks of alumina inventories, and the Strait of Hormuz — their only viable export and import corridor — remains effectively closed to commercial traffic. (FACT: ING Research, April 2026) This turns what might have been a temporary disruption into a structural deficit: even if political conditions improve, restarting damaged smelters takes months, and the alumina needed to feed them cannot arrive while Hormuz remains blocked.
The deficit that keeps growing
Before the Gulf crisis, ING had already projected a 600,000-tonne deficit for 2026 based on three independent constraints: China's 45 Mt capacity ceiling, the imminent Mozal smelter closure in Mozambique, and stalled restarts at European and US smelters idled during the 2022 energy crisis. (FACT: ING Research, Investing.com, April 2026) The Gulf destruction added a fourth constraint — one that dwarfs the others in magnitude.
Goldman Sachs, until recently the most bearish major bank on aluminum, reversed course after the March 28 strikes, raising its Q2 2026 price forecast to $3,450/t and projecting a 900,000-tonne deficit for the quarter alone — a complete reversal from the surplus it forecast through most of 2025. (FACT: Goldman Sachs, Prism News, April 2026) ING now sees a base-case deficit of roughly 1 Mt for 2026, with the severe disruption case reaching 2–2.5 Mt. Wood Mackenzie's worst-case scenario puts the deficit at 4 Mt. (FACT: ING, TradingPedia; Wood Mackenzie, Reuters April 16, 2026)
The backwardation that changes everything
Aluminum has historically traded in contango — forward prices above spot — reflecting the cost of storing and financing physical metal. In May 2026, the LME cash-to-three-months spread inverted to a backwardation of $95/t, the widest since 2007. (FACT: Reuters, April 16, 2026) This is not a statistical anomaly. It is the market's clearest signal that metal for immediate delivery is genuinely scarce.
LME registered inventories sit at approximately 418,675 tonnes — critically low relative to global consumption of roughly 70 Mt per year. Off-warrant shadow stocks have drained to 108,000 tonnes, down 52,000 tonnes since the start of 2026. (FACT: Reuters, March 19, 2026; Discovery Alert, May 2026) More than 150,000 tonnes of LME-registered metal was cancelled in March alone, removing whatever physical buffer the market held entering the conflict. (FACT: Goldman Sachs, Prism News)
Regional premiums confirm the scarcity
Japanese buyers, whose quarterly premium agreements serve as the Asian benchmark, agreed to pay $350–353/t for Q2 2026 shipments — the highest level in 11 years. (FACT: Discovery Alert, May 2026) US Midwest premiums and Rotterdam duty-paid premiums have also surged to multi-year highs. (FACT: FinancialContent, April 6, 2026) These are not speculative moves. Manufacturers have no choice but to pay inflated premiums just to guarantee they have metal. (FACT: Reuters, March 19, 2026)
What changed from mid-2025 to May 2026
Four things, each compounding the next: (1) Three independent pre-existing constraints — China's cap, Mozal closure, stalled Western restarts — had already put the market in deficit territory before any Gulf disruption. (2) The Gulf crisis removed ~9% of global smelting capacity through a combination of direct missile damage and Hormuz-related logistics paralysis. (3) LME inventories, already drawing since late 2024, collapsed as traders cancelled warrants and physical buyers scrambled for prompt metal. (4) Regional premiums in Japan, the US, and Europe surged to multi-year highs, confirming that the tightness is global, not regional.
The aluminum market has entered a structural deficit that will persist at least 12–24 months even under optimistic scenarios. New smelting capacity takes 3–5 years to build, and restarting damaged Gulf facilities requires both political resolution and alumina supply chains that do not currently function. Procurement teams should: (1) Lock 60–70% of H2 2026 volume at current LME levels — the backwardation means waiting will cost more for prompt metal. (2) Diversify away from Gulf-origin supply toward Russian, Indian, and Southeast Asian sources, but expect competition and overbooking at non-Gulf smelters. (3) Build buffer inventories equivalent to 4–6 weeks of consumption — the era of just-in-time aluminum procurement ended with the first strikes on Al-Taweelah. (4) Watch the LME cash-to-3M spread: if backwardation widens beyond $100/t, expect further price spikes toward $4,000/t. If it compresses below $40/t, the crisis may be easing.