Sweden — Nuclear Fleet Overview

Operating Reactors (database): 0 tracked in platform Total Tracked Capacity: see fleet summary Under Construction (database): 1 Planned: 2 Regulatory Body: SSM (Swedish Radiation Safety Authority)

Fleet Summary

Sweden's nuclear power program began in the 1960s, becoming a cornerstone of its energy mix by the 1980s with a peak of 12 operational reactors. As of 2023, Sweden operates 6 reactors across three sites—Ringhals, Forsmark, and Oskarshamn—providing a net capacity of approximately 6.9 GWe and generating about 30% of the country's electricity. Recent closures, including Ringhals 1 and 2, reflect a historical phase-out policy, though Ringhals 1 is under consideration for restart as noted in current plans. The fleet's future hinges on policy shifts toward potential expansion and small modular reactor (SMR) development to meet carbon neutrality goals by 2045.

Policy & Outlook

Sweden's nuclear policy has oscillated between phase-out commitments, stemming from a 1980 referendum, and pragmatic energy security needs, with a 2016 agreement allowing reactor life extensions and new builds under certain conditions. The current center-right government, elected in 2022, supports nuclear expansion, targeting up to 10 new reactors by 2045 and easing restrictions on nuclear development. Legislation is evolving to facilitate SMRs, with projects like SEALER and SEALER-Arctic in conceptual design stages for potential deployment in remote or industrial applications. This aligns with Sweden's ambition to achieve net-zero emissions while addressing rising electricity demand.

Key Sites

• Ringhals Nuclear Power Plant: Located on Sweden's west coast, Ringhals hosts four reactors (though Ringhals 1 and 2 are recently shut down), with Ringhals 1 potentially restarting as part of capacity expansion plans; it historically contributed significantly to national power supply.
• Forsmark Nuclear Power Plant: Situated on the east coast, Forsmark operates three boiling water reactors (BWRs) with a combined capacity of about 3.3 GWe, making it a critical asset for Sweden’s grid stability.
• Studsvik Research Facility: Near Nyköping, Studsvik historically operated research reactors like R2-0 (now permanently shut down) and remains a hub for nuclear materials testing and decommissioning expertise.

Historical Context

Sweden's nuclear journey started with the commissioning of the Ågesta reactor in 1964, a small district heating reactor, followed by commercial power reactors in the 1970s at sites like Oskarshamn and Ringhals. The 1980 referendum, prompted by the Three Mile Island incident, set a phase-out target by 2010, though economic and energy needs delayed this, leading to a peak of 12 reactors by the mid-1980s. A notable incident occurred at Forsmark in 2006, where a power failure exposed safety vulnerabilities, though no radiation was released, prompting significant safety upgrades across the fleet. Nuclear power remains a polarizing yet vital component of Sweden’s energy history.

Operating Reactors (Platform Database)

No reactors in database for this category.

Under Construction (Platform Database)

Reactor	Site	Type	Capacity (MWe)	Expected Operation
Ringhals 1 (restart)	—	BWR	900	TBD

Sources

• IAEA PRIS — Sweden — IAEA Power Reactor Information System
• WNA Country Profile — World Nuclear Association
• SSM (Swedish Radiation Safety Authority) — National nuclear regulator

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Enriched by Grok · Second Atomic Age Nuclear Wiki · 2026-05-10