Aluminum Supply Deficit Deepens: ING Forecasts Structural Shortfall as Smelters Go Dark

The global aluminum market is tightening at an accelerating pace, with ING projecting that the 2026 deficit will support prices through the year as supply losses compound. The structural backwardation on the LME — cash at a $72/t premium to 3-month as of mid-May — signals a market where physical metal is scarce and consumers are paying aggressively for prompt delivery. LME registered inventories have dropped to 344,000 tonnes, the lowest since the 2022 energy crisis, and live warrants continue to shrink. (FACT: ING, March 2026; Discovery Alert, May 19, 2026)

The deficit narrative is driven by an extraordinary series of supply shocks. The Iran-Gulf conflict in late March destroyed an estimated 3.0-3.2 million tonnes of annual smelter capacity across Emirates Global Aluminium's Al Taweelah plant and Aluminium Bahrain. Qatalum's output was cut by 40% due to gas supply disruptions. Combined, the Gulf region has effectively lost nearly 9% of global ex-China supply in a matter of weeks. (FACT: Reuters, April 16, 2026; Discovery Alert, May 20, 2026)

Outside the Gulf, supply losses are accelerating. Mozal in Mozambique — a 580,000-tonne-per-year smelter operated by South32 — was closed in Q1 2026 following security incidents and power supply instability. The smelter was a major supplier of low-carbon hydro-powered aluminum to European and Asian markets. In Iceland, Grundartangi suffered an electric arc furnace failure in April, taking 320,000 tonnes of capacity offline with a recovery timeline of 11-12 months. Century Aluminum's Iceland facility is similarly sidelined. (FACT: Reuters, April 16, 2026; AL Circle, May 2026) The combined Mozal-Grundartangi-Century Iceland losses amount to more than 1 million tonnes of annualized capacity removed from the ex-China supply pool.

ING's analysis, published in March 2026, forecast that the aluminum deficit would persist through 2026, with prices supported by the structural imbalance between constrained supply and resilient demand. That assessment predated the full extent of the Gulf crisis, suggesting the deficit may now be even larger than initial projections. The backwardation structure on the LME — consistently above $50/t since April — is the market's way of signaling that physical supply is insufficient to meet prompt demand. (FACT: ING, March 2026; Discovery Alert, May 21, 2026)

AL Circle has characterized the current backwardation as structural, distinguishing it from the short-lived backwardations seen during the 2021-2022 energy crisis. In their assessment, the current market structure is driven by fundamental supply-demand imbalance rather than temporary logistical bottlenecks. The cash premium at $72/t is reinforced by the financial incentive to liquidate inventory — when spot prices exceed forward prices, there is no economic reason to hold metal in warehouse, accelerating the inventory drain. (FACT: AL Circle, May 2026)

On the demand side, the structural growth drivers remain intact. Electric vehicle production, solar photovoltaic installation, and grid infrastructure spending continue to absorb increasing volumes of aluminum. Chinese demand from the construction sector is weak — property completions down 9.8% year-on-year — but this is offset by special bond-funded infrastructure projects and the broader energy transition buildout. The IEA's net-zero scenario implies aluminum demand growth of 2-3% annually through 2030, meaning demand-side destruction is unlikely to resolve the deficit at current price levels. (FACT: Reuters, April 16, 2026; Trading Economics, May 2026)

The US tariff regime adds another layer of complexity. Section 232 tariffs at 50% on full customs value, combined with a 200% tariff on Russian aluminum, effectively segment the US market from global supply. EU countermeasures and CBAM implementation further fragment trade flows. The result is that supply deficits cannot be easily resolved by redirecting material from one region to another — each major consuming region faces its own unique barriers to imports. (FACT: Reuters, April 16, 2026; Sora Futures, May 2026)

The forward curve on the LME reinforces the deficit outlook. Cash aluminum at approximately $3,637/t, 3-month at $3,565/t, and 15-month at roughly $3,400/t indicates that the market expects tightness to persist but gradually ease as high prices incentivize restarts and new capacity. However, the reality of aluminum smelting is that restarts take 6-12 months and cost hundreds of millions of dollars — the Gulf smelters will not be back online quickly. The deferred curve is a forecast, not a guarantee. (FACT: Discovery Alert, May 19, 2026)

China's position as the world's largest producer — operating at its enforced 45-million-tonne annual capacity cap — complicates the deficit picture. Chinese output hit record levels of approximately 129,000 tonnes per day in April 2026, but the cap prevents further expansion. The SHFE-LME spread has widened to roughly -6,800 yuan/t, reflecting China's domestic surplus against tightening ex-China markets. This split means that Chinese aluminum cannot easily flow westward to resolve the Western deficit because of the export tax structure and the fact that China's surplus is already priced into SHFE, while Western buyers face a completely different set of supply constraints. (FACT: AL Circle, May 2026; Trading Economics, May 2026)

The trajectory of LME stocks is the single most important indicator to watch. At the current drawdown rate of roughly 10,000-15,000 tonnes per week, headline LME inventories could fall below 300,000 tonnes within 4-6 weeks. Historically, aluminum backwardation has exceeded $100/t when stocks have approached that level, and the premium has persisted until either a visible supply response or demand-side destruction materializes. (FACT: Discovery Alert, May 19, 2026; ING, March 2026)