OKG's owners decided in 2015 to close Oskarshamn 1 and 2 early; O2 has been shut since 2016 and O1 since 2017, with Oskarshamn 3 still running. Reactor internals were segmented in 2018-2019, large-scale dismantling started in 2020, and the reactor pressure vessels were fully cut up by February 2025.
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Current state
| Status | Active dismantling |
| Country | Sweden |
| Location | Oskarshamn, Kalmar |
| Site | Oskarshamn |
| Units | O1, O2 |
| Unit count | 2 |
| Reactor types | BWR |
| Owner / licensee | OKG AB (Uniper) |
| Decommissioning contractor | UNNU consortium (NUKEM/Uniper Nuclear Services) |
| Strategy | Immediate dismantling |
| Final shutdown | 2017 |
| Decommissioning start | 2018 |
| Target completion | 2028 |
| Spent fuel | No fuel left at O1 and O2 since autumn 2018. |
Notes
target 2028 = SSM's ~8-year estimate from 2020.
Timeline
- 2015 — OKG's owners decided to close O1 and O2 early. (source)
- 2017-12 — O2 was defuelled. (source)
- 2018 — Cutting of O2 reactor internals began. (source)
- 2020 — Large-scale dismantling and demolition of contaminated systems and buildings began. (source)
- 2025-02-07 — The final reactor pressure vessel dismantling at Oskarshamn was reported complete. (source)
The timeline is append-only: corrections are added as new entries. Stated targets appear in the current-state table, never as milestones.
NNN coverage
About Oskarshamn Nuclear Power Plant
Related sites
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Sources
- Dismantling and demolition — OKG (primary), checked 2026-10-11
- Anläggningar under avveckling — Swedish Radiation Safety Authority (SSM) (primary), checked 2026-10-11
- NUKEM and UNS dismantle final RPV at Sweden's Oskarshamn — ANS Nuclear Newswire, checked 2026-10-11