---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-101317"
form_type: "8-K"
ticker: "CENX"
cik: "0000949157"
company_name: "CENTURY ALUMINUM CO"
filed_at: "2025-10-22T23:59:59+00:00"
generated_at: "2026-05-17T02:55:41.148723+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Century Aluminum halts one potline at Iceland smelter after equipment failure; production reduced ~2/3

## Summary
- Electrical equipment failure at Grundartangi, Iceland smelter forced temporary stop of one of two potlines.
- Production reduced by approximately two-thirds; other potline remains unaffected and in full production.
- No injuries reported; company assessing replacement equipment timeline and impact.
- Century expects losses will be covered by property and business interruption insurance policies.
- Update to be provided on November 6 quarterly earnings conference call.

## SEC filing metadata
- accession: 0001104659-25-101317
- form_type: 8-K
- ticker: CENX
- cik: 0000949157
- company_name: CENTURY ALUMINUM CO
- filed_at: 2025-10-22T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/949157/000110465925101317/0001104659-25-101317-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/949157/000110465925101317/tm2529215d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-101317
- JSON: https://secwatch.observer/filing/0001104659-25-101317.json
- Plain text: https://secwatch.observer/filing/0001104659-25-101317.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.