Sweden’s nuclear sector has entered a new period. For decades, national policy assumed that nuclear power would gradually disappear. Several reactors closed, investment slowed, and the remaining fleet became associated mainly with life extensions. That direction has now changed. Sweden still depends on six large reactors for a substantial share of its electricity, while the government is creating financial and legal conditions for new construction.
The shift is closely connected to rising electricity demand. Electrified transport, fossil-free steel, battery manufacturing and data centers could require far more power than Sweden uses today. Wind generation is expanding, but policymakers also want production that is available regardless of weather. Nuclear power has therefore moved from being a legacy technology to a central part of Sweden’s industrial and energy-security strategy.
Six Reactors Still Form a Major Part of Sweden’s Power System
Sweden operates six commercial reactors at three sites. Forsmark, north of Stockholm, has three boiling water reactors. Oskarshamn, on the Baltic coast, has one large boiling water reactor, while Ringhals, south of Gothenburg, operates two pressurized water reactors. Together, the fleet provides about 7 gigawatts of net capacity.
Nuclear power normally supplies around 30% of Swedish electricity, although its annual share changes with reactor availability, hydropower conditions and demand. The plants complement a system that also relies heavily on hydropower and wind. Nuclear stations provide large volumes of steady generation, while reservoirs respond more quickly to changes in demand and renewable output.
The geography also matters. Much of Sweden’s generation is located in the north and center, while major population and industrial centers are in the south. Ringhals is especially valuable because it supplies electricity closer to areas where grid constraints and high prices have become politically important.
Sweden once operated twelve commercial reactors. Units at Barsebäck, Oskarshamn and Ringhals closed between 1999 and 2020, leaving half of the former fleet. Operators are now examining investments that could allow the surviving reactors to run for as long as 80 years, subject to safety approval and economic viability.
Sweden Has Replaced Its Phase-Out Legacy with an Expansion Policy
Swedish nuclear policy once reflected the 1980 referendum supporting a gradual phase-out. The timetable changed repeatedly, but uncertainty discouraged new projects. Recent governments have moved in the opposite direction. Sweden’s electricity objective is now based on 100% fossil-free generation rather than 100% renewable generation, giving nuclear power an explicit long-term role.
Legal limits restricting new reactors to existing sites and capping the fleet at ten units were removed. A state-aid framework that entered into force in August 2025 now allows government loans and two-way contracts for difference.
Loans are intended to reduce financing costs during development and construction. A contract for difference would stabilize revenue after operation begins: support is paid when market prices fall below an agreed level, while money is returned when prices rise above it. The framework is designed to support roughly 5 gigawatts of new capacity, but every project requires separate negotiations and parliamentary approval.
Sweden has therefore created a pathway for selected projects rather than started construction. Design, licensing, site work, supply-chain capacity and cost control still stand between political ambition and commercial operation.
Ringhals Has Become the Leading New-Build Site
The most advanced proposal comes from Videberg Kraft, backed by state-owned Vattenfall and the industrial consortium Industrikraft. Its application seeks support for around 1.5 gigawatts at Ringhals. Existing reactors, grid connections, nuclear expertise and local familiarity make the site the clearest location for Sweden’s first new project in decades.
In June 2026, Videberg Kraft selected Rolls-Royce SMR for detailed planning. The concept involves three pressurized water reactors with combined capacity of about 1.4 gigawatts. Vattenfall estimates annual production of roughly 12 terawatt-hours.
The decision gives the proposal a specific technology and scale, but it is not a final investment decision. Detailed engineering, financing, environmental review and nuclear licensing remain. The government has also proposed taking a 60% ownership position in Videberg Kraft, which would make the state the controlling shareholder rather than only a lender and policy sponsor.
Ringhals is Sweden’s most conventional expansion route: an established nuclear site using a light-water design based on familiar operating principles. Its performance will strongly influence confidence in the wider program.
New Applications Are Expanding the Technology Debate
Sweden is also considering less conventional projects. In June 2026, Blykalla submitted the second application under the aid program. It proposes six lead-cooled modular reactors at Norrsundet, near Gävle, with total capacity of about 330 megawatts.
Lead-cooled reactors are advanced systems rather than conventional commercial light-water reactors. Supporters argue that modular construction and passive safety could serve industrial users and reduce some construction risks. A first commercial project, however, also carries technology, licensing and supply-chain uncertainty.
Studsvik submitted a third application later in June. Its alternatives include two to four modular light-water reactors near Nyköping, totaling 600 to 1,400 megawatts, or four to six reactors near Valdemarsvik with combined capacity of 1.2 to 1.6 gigawatts.
The proposals force Sweden to decide what it wants from new nuclear power. A large project can replace major volumes of firm generation, while smaller units could be placed closer to industry and added in stages. Public finance, regulatory capacity and specialist labor will limit how many concepts can move forward at once.
Existing Reactors and Nuclear Waste Remain Central
New reactors would not arrive soon enough to meet all near-term needs, making the existing fleet equally important. Long-term operation requires replacement equipment, modern controls, maintenance and continued safety review. Unexpected outages can still affect regional prices because each unit represents a large block of generation.
Sweden also has one of Europe’s most advanced spent-fuel plans. Construction has begun at Forsmark on a deep geological repository intended to hold about 12,000 tonnes of spent fuel. The material will be sealed in copper canisters, surrounded by bentonite clay and placed around 500 meters underground in stable bedrock. Disposal is expected to begin during the 2030s.
This gives Sweden a defined waste route that many nuclear countries have not yet achieved. It also reinforces that expansion must address the entire fuel cycle rather than treating waste as a later problem.
Sweden’s Nuclear Future Depends on Delivery
Sweden has moved beyond debating whether nuclear power should remain in the electricity mix. The question is whether it can deliver new capacity at an acceptable cost while keeping the existing fleet reliable.
Ringhals is the leading test, but the program will be judged by financing discipline, licensing speed, technology performance and the supply of skilled workers. Until construction begins, Sweden’s nuclear revival remains a policy and project-development program. Its strategic importance is already clear: Sweden is planning for much higher electricity demand, and nuclear power is expected to provide part of the firm generation needed to support it.
