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Andy Home: ROI-Power overrules tariffs, as another US aluminum smelter closes.

The U.S. import duties haven't stopped the United States from losing another aluminum smelter. This leaves only five primary metal production facilities in the country.

Century Aluminum suspended production at its Hawesville Smelter in 2022 due to a spike in energy prices following Russia's invasion in Ukraine.

They expected to resume operation within a year, once the power prices dropped. Century didn't deliver, and now the company has sold its Kentucky site to digital technology company TeraWulf.

Aluminium smelters are massive energy users. A modern plant uses more electricity than a city of the size of Boston.

Big Tech is also willing to pay more for data centers, and the fight for long-term energy supply.

HALTING THE SLIDER

Last year, U.S. president Donald Trump raised the import tariff on aluminium to 50% with the stated aim of stopping the decades-long decline in the domestic primary metals capacity.

Century's Mount Holly smelter, located in South Carolina, has had a limited impact on the immediate future. It will restart 50,000 metric tonnes of capacity annually. Tariffs were important, but extending the power supply agreement with Santee Cooper (a local energy provider) was more crucial.

By the middle of 2026, the plant will be operating at near-capacity of 220,000 tonnes per year.

A state-of the-art greenfields smelter is on its way in Oklahoma. This joint venture, which is 60:40 between Century and Emirates Global Aluminium, promises to be a future success.

Bechtel, a U.S. engineering company, has been selected by the partners to conduct preliminary studies on the proposed plant. It would have an annual capacity of approximately 750,000 tons.

Oklahoma's advantage is that it produces three times as much energy as it consumes. A power supply agreement for the new plant is still in the works. Even if construction starts on time by the end this year, the first metal production will likely not begin until 2030.

LOSS OF CAPACITY FLEX

Hawesville's permanent closure reduces the idle capacity that can be used to fill in the gaps between now and the opening of the new Oklahoma smelter.

Hawesville, with its annual capacity of 252,000 tonnes, was the second largest remaining smelter in America. It also supplied high-purity aluminum for aerospace and defense applications.

Alcoa has a 54,000 ton-per-year production at Warrick in Indiana that is idle, but it does not seem to be in a hurry to restart it.

The cost of reactivation is estimated at $100 million, and it would take two years. "At this point, we are unlikely to restart," William Oplinger, Alcoa's President and CEO, told analysts during the company's Q4 results call for 2025 last month.

The only remaining smelter is the New Madrid one in Missouri. It was reactivated by 2018 and closed in 2024.

Tariffs have reignited hope that the 263,000 ton-per-year facility could be brought back to life, but it would cost a lot and take a long time.

Magnitude 7 Metals, the current owner of Magnitude 7, has not indicated its intentions.

No Tariff TRUCE

According to the U.S. Geological Survey, 60% of aluminum consumption in the United States last year was imported.

It won't change until the Oklahoma smelter moves from "project" status to actual production.

The Trump administration does not seem to be willing to back down on its import tariffs.

The White House dismissed media reports that it would lower tariff rates or provide more exemptions, as "baseless speculative speculation".

According to a senior administration official, Trump "will not compromise on reviving the domestic manufacturing which is crucial to our economic and national security. This includes steel and aluminum production."

Some tweaks may be made, but a wholesale rollback is unlikely.

This means that aluminum consumers in the United States will be paying high prices for their metal for the next couple of years.

S&P Global Platts assesses the Midwest Aluminium Premium, which is traded on CME. This premium captures the tariff impact of the market.

The London Metal Exchange's cash price is $2,290 a ton, which translates to a "all-in" rate of $5,300 a ton.

The fact that Hawesville has not been able save itself from a?such a high premium? says a lot about the fierce competition between Big Tech and other power providers for a competitively priced product.

AI still wins out against aluminium.

Andy Home is a journalist. This column is a favorite of yours? Open Interest (ROI), a data-driven, thought-provoking commentary on the markets and finance is available at Open Interest. Follow ROI on LinkedIn, X and X.

Listen to the Morning Bid podcast daily on Apple, Spotify or the app. Subscribe to the Morning Bid podcast and hear journalists discussing the latest news in finance and markets seven days a weeks. (Editing by Marguerita choy)

(source: Reuters)