Century Aluminum resumes production at Grundartangi ahead of schedule

Century Aluminum (NASDAQ: CENX) restarted production this week in the second potline at its Norðurál smelter in Grundartangi, Iceland, several months ahead of schedule.

Rhea-AI Summary

Century Aluminum (NASDAQ: CENX) restarted production this week in the second potline at its Norðurál smelter in Grundartangi, Iceland, several months ahead of schedule. Potline two represents about two-thirds of the plant’s total capacity. The company plans to restart remaining pots on an accelerated schedule to reach close to full production by end of July 2026. Repairs to transformers were completed with specialists, designers and the equipment manufacturer; permanent replacement transformers have been ordered and are expected to be installed upon delivery this fall.

This restart follows a prior, unanticipated transformer failure and accompanies a recent production expansion at Mt. Holly.

Positive

• Second potline restarted several months earlier than planned
• Potline two equals about two-thirds of plant capacity
• Targeting close to full production by end of July 2026
• Permanent replacement transformers ordered for fall installation

Negative

• Operations were interrupted by an unanticipated transformer failure
• Full permanent repairs depend on transformer delivery expected this fall

Argus Apr 24 session

+1.45% close to close Open Argus

Details

News Market Reaction – CENX

On Apr 24, the first trading day after this news, CENX closed 1.45% above the previous close.

Data tracked by StockTitan Argus for the Apr 24 session.

Key Figures

Potline 2 share: two-thirds of plant capacity

Potline 2 share

two-thirds of plant capacity

Grundartangi second potline output share

Historical Context

5 past events · Latest: Apr 16

5 events

1. Apr 16

   Capacity expansion

   24h Move

   -5.1%

   Mt. Holly smelter expansion with full production targeted by end of June 2026.

2. Apr 02

   Policy / tariffs

   24h Move

   -1.5%

   Executive order reinforcing 50% Section 232 tariffs on primary aluminum imports.

3. Mar 23

   Leadership change

   24h Move

   +8.1%

   Promotion of Levi Chaffin to Senior Vice President of Operations, Americas.

4. Feb 24

   Strategic project

   24h Move

   +3.2%

   Agreement to develop downstream plant near planned Oklahoma smelter hub.

5. Feb 23

   Conference participation

   24h Move

   -1.5%

   CEO presentation and Q&A at BMO 2026 Global Metals & Mining conference.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Key Terms

potline, smelter, nasdaq

3 terms

potline technical

"restarted production this week in the second potline at its Norðurál smelter"

A potline is a long row of connected electrochemical cells used in primary aluminum production, where each cell (or “pot”) reduces alumina into molten aluminum using large electrical currents. Think of it as an industrial assembly line for turning raw material into metal. Investors care because a plant’s potlines determine how much aluminum it can make, how much electricity and cost it needs, and how single outages or regulatory limits can quickly affect output and profits.

smelter technical

"restarted production this week in the second potline at its Norðurál smelter in Grundartangi"

A smelter is an industrial plant that heats and processes mined ore to extract and produce usable metal (like copper, aluminum or nickel), turning raw rock into market-ready metal much as a kitchen turns raw ingredients into a finished meal. Investors care because smelters are costly to build and operate, they control how much refined metal enters the market, and their output, costs, and environmental or regulatory issues can directly affect commodity prices and company profits.

nasdaq financial

"Century Aluminum Company (NASDAQ: CENX) restarted production this week"

The Nasdaq is a stock exchange where many companies' shares are bought and sold, functioning much like a marketplace for investments. It matters to investors because it provides a platform to buy and sell ownership stakes in companies, helping them track the value of those companies and make informed decisions. As one of the largest and most technology-focused markets, it also reflects trends and developments in the business world.

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CHICAGO, April 23, 2026 (GLOBE NEWSWIRE) -- Century Aluminum Company (NASDAQ: CENX) restarted production this week in the second potline at its Norðurál smelter in Grundartangi, Iceland, several months earlier than planned.

Employees energized the first pots in Grundartangi’s second potline and will continue restarting the remaining pots on an accelerated schedule to reach close to full production by the end of July. Potline two represents about two-thirds of the plant’s total capacity. The restart comes after specialists, collaborating with the designers and the manufacturer of the equipment, made repairs to the transformers following an unanticipated failure. Permanent replacement transformers have been ordered and will be installed upon expected delivery this fall.

“We’re proud of our Grundartangi team, who worked tirelessly to resume production under difficult circumstances,” said Jesse Gary, President and CEO of Century Aluminum. “The team demonstrated resolve and resilience in undertaking repairs to resume production faster. Coupled with our recent production expansion at Mt. Holly, Grundartangi’s restart reinforces Century’s commitment to meeting our customers’ needs with the urgency the marketplace demands.”

About Century Aluminum Company

With its corporate headquarters located in Chicago, IL, Century Aluminum owns and operates primary aluminum smelting facilities in the United States and Iceland and is the majority owner and managing partner of the Jamalco alumina refinery in Jamaica. Visit www.centuryaluminum.com for more information.

Investors: Chad Rigg, 312.696.3132, investorrelations@centuryaluminum.com
Media: Tawn Earnest, 614.698.6351, tawn.earnest@centuryaluminum.com

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

When did Century Aluminum (CENX) restart production at Grundartangi?

Century Aluminum restarted the second potline at Grundartangi this week, several months earlier than planned. According to the company, employees energized the first pots and will continue restarting remaining pots on an accelerated schedule toward full production by end of July 2026.

How much of Grundartangi's capacity does the restarted potline represent for CENX?

The restarted second potline represents about two-thirds of the plant’s total capacity. According to the company, bringing this potline back online substantially restores production while remaining pots are sequentially energized through July 2026.

What caused the outage at Century Aluminum's Grundartangi smelter and what repairs were made?

An unanticipated transformer failure prompted repairs to restore operations. According to the company, specialists, designers and the equipment manufacturer collaborated on transformer repairs and permanent replacement transformers have been ordered for fall installation.

When does Century Aluminum expect Grundartangi to reach near full production (CENX)?

Century Aluminum expects to reach close to full production at Grundartangi by the end of July 2026. According to the company, the remaining pots in potline two will be restarted on an accelerated schedule to meet that timeline.

Will the transformer issue at Grundartangi affect Century Aluminum's long-term operations (CENX)?

The company ordered permanent replacement transformers for installation upon expected delivery this fall, indicating planned long-term remediation. According to the company, temporary repairs enabled the accelerated restart while awaiting permanent equipment delivery.