Indiana Aluminum: 2,500 Jobs and a Tariff Line That Held, For Now

U.S.-Canada trade talks collapsed in late August after Washington proposed cutting the tariff on Canadian primary aluminum from 50% to 25%, with a similar reduction on fabricated products. Those talks broke down. Washington responded with fresh 50% tariffs on roughly $20 billion in Canadian goods; Canada's dollar-for-dollar retaliation took effect September 8.

Indiana has 38 aluminum extrusion, rolling, and sheet facilities employing roughly 2,500 workers, a concentration that industry advocates cited directly in tariff coverage as significant national exposure. The 50% tariff line held. For now.

Here is the variable the tariff headline obscures. Alcoa's pending decision on whether to restart a fourth production line at its Warrick smelter near Evansville (Indiana's only primary aluminum facility, currently running two of five lines) is a $100 million evaluation that CEO Bill Oplinger acknowledged in April could take one to two years given deteriorated line conditions and long-lead electrical equipment procurement. The economics of that restart tighten or loosen materially depending on where the tariff lands in the next round of talks.

The bifurcation is the real story. Vertically integrated players like the Alcoa-Kaiser Warrick complex, Kaiser purchased the adjacent rolling mill from Alcoa in 2021 for $670 million and sources primary metal under a market-based supply agreement, have a cost moat that open-market Indiana extruders simply do not have. If the tariff rate moves in the next negotiating round, those two groups face completely different exposure.

Know which category your aluminum suppliers fall into before the next round of negotiations begins.