Grundartangi smelter: an aluminum operation in Iceland
Grundartangi smelter is an aluminum smelter producing aluminum in Grundartangi, Iceland, operated by Century Aluminum. The sources report 260,000 tonnes per year (tpy), 'Actual 2025 Annual Production' for CY2025; the basis is 100%, wholly owned by Century. Measured as primary aluminum, whole-operation output for CY2025 is 260,000 tonnes: about 0.4% of world aluminum output in 2025 and about 35% of Iceland's; it is one of 28 operations on this site whose output can be stated in primary aluminum.
Who owns and operates it?
| Owner | Interest | As of |
|---|---|---|
| Century Aluminum | 100% | 31 December 2025 |
How much does it produce?
| Period | Output | Basis | Where in the source |
|---|---|---|---|
| CY2025 | 260,000 tonnes per year (tpy), 'Actual 2025 Annual Production' | 100%, wholly owned by Century | printed p.2, Item 1 Business, table of primary aluminum smelters, row 'Grundartangi, Iceland', column 'Actual 2025 Annual Production (tpy)' · Century Aluminum Company |
How the primary-aluminum figure is worked out. Century's 10-K prints 260,000 tonnes as the actual 2025 annual production of the smelter, which Century owns at 100%. World smelter production of primary aluminum in 2025 was 74,000,000 tonnes (USGS Mineral Commodity Summaries 2026); Iceland produced 750,000 tonnes.
Status: ramping, as of 30 June 2026.
- Century's table prints 'Annual Production Capacity (tpy)' of 320,000 tonnes alongside actual 2025 production; the capacity figure is not used.
- Century's 10-K says Grundartangi's other, smaller potline was unaffected and remained in full production after the October 2025 equipment failure.
How does it compare?
Other aluminum operations on this site: Alma smelter, Alouette smelter, Bécancour smelter, Boyne Island smelter, Tomago smelter, Kitimat smelter, Tiwai Point smelter, Sohar smelter, Laterrière smelter, Grande-Baie smelter, ISAL smelter, Bell Bay smelter. In Iceland: ISAL smelter. See where aluminum comes from for the country totals, the country page for Iceland, and Century Aluminum for its other operations here.
Sources
- Century Aluminum Company: Form 10-K for the year ended 31 December 2025 (annual report (SEC 10-K, filed 2026-03-03), CY2025). Opened 4 November 2026; used: printed pp.1-2 (Item 1 Business, smelter table); Item 2.
- Century Aluminum Company: Form 10-Q for the quarter ended 30 June 2026 (quarterly report (SEC 10-Q, filed 2026-08-06), Q2 2026). Opened 4 November 2026; used: printed p.33.
- U.S. Geological Survey: Mineral Commodity Summaries 2026: Aluminum (government statistical summary, 2025 (world and country smelter production)). Opened 3 November 2026; used: world smelter production and capacity table.
Method and limits
- Reported, not estimated. Output is the figure the operator or owner published, in the unit it used. This site does not estimate output where none is published.
- Shares. A share divides output in primary aluminum by the USGS world or country total for 2025. Where the operator's year is a fiscal year or the unit is a concentrate or a carbonate equivalent, the share is approximate or not given.
- What is compared. The figure is tonnes of primary aluminum metal produced by the whole smelter, compared with USGS smelter production of primary aluminum. Remelted and recycled metal is not primary production.
- Whole operation or owner's share. The basis column says which. A joint venture's output is never counted twice.
- Partial list. Only operations with a published figure are listed, so the rank is among those on this site, not among every aluminum mine. Shares of a country's output mix periods and bases, so treat them as indicative.
- Made with AI assistance, checked against sources. The facts were gathered from the documents above by AI-assisted research and re-checked against those documents by a second, independent pass; the page text is generated from the data. No professional review took place. How the site is made. To report an error, contact us; fixes are logged on the corrections page.