U.S. Aluminum Prices Remain High After Novelis Fire Hit Supply Chain

A major fire at Novelis' Oswego plant, which supplies 40% of the U.S. auto industry's aluminum sheet, has idled its hot mill until 2026, causing a significant domestic supply shock. This disruption, amplified by existing U.S. tariffs on aluminum imports, has driven the U.S. Midwest Premium to an all-time high of $0.77/lb, increasing market volatility and costs for alternative sourcing. While LME aluminum prices have also seen an uptrend, supported by a weaker dollar, the sustainability of this price appreciation is challenged by soft global demand and rising exchange inventories.

Analysis

A significant fire at Novelis' Oswego facility, supplying approximately 40% of the U.S. auto industry's aluminum sheet, has idled its hot mill until early 2026, leading to a force majeure declaration. This substantial domestic supply disruption immediately propelled the U.S. Midwest Premium to an all-time high of $0.77/lb as of October 6, exceeding pre-event expectations. Ford's shares experienced an immediate decline, reflecting market concerns over supply chain stability.

Existing U.S. tariffs, including a 50% duty on offshore imports, have amplified the impact of this outage, making alternative sourcing from Novelis' international plants significantly more costly. This policy environment has already tightened domestic supply, with total U.S. aluminum imports falling 10.17% from February to August compared to the prior year. The collective emphasis on supply security by procurement organizations, driven by tariffs and past shocks, ironically increases volatility risk for U.S. aluminum prices during disruptions.

While LME three-month aluminum prices appreciated 2.61% last month, reaching a March high, supported by a softer U.S. dollar following Fed rate cuts, the sustainability of this uptrend faces headwinds. Global demand conditions remain soft, evidenced by a 4.4% decline in U.S. and Canadian consumption during H1. Furthermore, LME aluminum inventories have rebounded to their highest level since March, suggesting potential oversupply despite China's output caps.

Key Decisions for Investors

• Investors should monitor U.S. aluminum supply chain resilience and Midwest Premium trends, as the Novelis outage and tariffs create persistent domestic price volatility and elevated conversion costs.
• Evaluate exposure to automotive and other industries heavily reliant on U.S. aluminum sheet, considering potential for continued supply disruptions and increased input costs.
• Assess the balance between rising LME prices, driven by macro factors like a weaker dollar, and the underlying soft global demand and increasing exchange inventories, which could cap further upside.