Nuclear Power in Sweden

(Updated June 2019)

  • Sweden has eight nuclear power reactors providing about 40% of its electricity.
  • In 1980, the government decided to phase out nuclear power. In June 2010, Parliament voted to repeal this policy.
  • The country's 1997 energy policy allowed 10 reactors to operate longer than envisaged by the 1980 phase-out policy, but also resulted in the premature closure of a two-unit plant (1200 MWe). Some 1600 MWe was subsequently added in uprates to the remaining ten reactors.
  • In 2015 decisions were made to close four older reactors by 2020, removing 2.7 GWe net.
  • Sweden had a tax discriminating against nuclear power – about 0.75 Euro cents/kWh, making up about one-third of the operating cost of nuclear power. Wind and biomass are subsidised by about three times that. The tax was abolished in 2016 and fully phased out by 2019.


Nuclear Power Plants in Sweden Map


Sweden's electricity consumption has been rising, and at approximately 12,800 kWh/yr per capita on average, individual consumption is very high. In 2016, Sweden generated 156 TWh, of which 63 TWh (40%) was from nuclear and 62 TWh (40%) from hydro. Wind provided 15.5 TWh (10%), various fossil fuels 2 TWh, and biofuels & waste 13 TWh (8%). Total capacity at the end of 2016 was 40 GWe1. By law, grid operator Svenska Kraftnät must ensure there is about 2000 MWe winter reserve capacity.

Electricity imports and exports vary according to season, with Finland, Norway and Denmark providing the main traffic. In 2008 net exports were 2.0 TWh, in 2011, 7.2 TWh, in 2012, 19.6 TWh, in 2013, 10 TWh, in 2014, 15.6 TWh, in 2015, 22.6 TWh, and in 2016 11.7 TWh.

The state utility is Vattenfall AB, and private utilities include E.ON Sweden AB and Fortum Oy (majority-owned by the Finnish government).

Up to the late 1960s, there was a focus on hydro electricity to power Sweden's industrial growth. In 1965, it was decided to supplement this with nuclear power, to avoid the uncertainties of oil prices and increase the security of supply. The policy was reinforced by the oil shocks of the early 1970s, at a time when Sweden depended on oil for about one-fifth of its electricity and electricity demand was increasing by 7% per year. Hydroelectric output depends very much on seasonal precipitation, varying from 78 TWh in 2000 to 66 TWh in 2010.

In the mid-1970s, the nuclear push became a political issue, and 1977 legislation was passed to ensure proper waste management. This provided the basis for Sweden's world leadership in management of used fuel (particularly for those countries not reprocessing it).

Sweden has been an enthusiastic supporter of measures to improve world environmental quality. Among many others, at the Earth Summit in Rio de Janeiro in 1992, Sweden committed itself to stabilise carbon dioxide emissions at 1990 levels by 2000, and this was reaffirmed in 1995 at the first Conference of Parties to the United Nations Framework Convention on Climate Change (UNFCCC) in Berlin. The fact that those levels in 1990 were only 60% of those of the 1970s was due to nuclear energy replacing most oil for electricity generation.

Following announcements that four reactors would close by 2020 due to declining profitability, representatives of E.On, Vattenfall and Fortum met with the energy minister in November 2015 and warned that the operating environment for energy production in Sweden is "troubling" and in the medium term nuclear generation should not be taken for granted. Fortum said that while "nuclear safety is always our first priority, …. heavy safety investments together with Sweden's unique capacity tax pose a negative, totally unreasonable burden on nuclear power." (See sections below on the capacity tax and individual plants.)

In mid-2016, as a corollary to repeal of the capacity tax, the government said it envisioned (but did not require) all the present operating nuclear reactors to be shut down by 2050. This would require significant dependence on imported power such as from Finland’s nuclear plants, and would deprive Norway of back-up for its hydro in dry years.

Nuclear industry development

In 1947, the government established an atomic energy research organization, AB Atomenergi. The country's first experimental reactor, R1, was commissioned in 1954. Then, in 1956, a commission recommended development of a nuclear power program also producing heat. Atomenergi commissioned two test reactors – one 50 MWth (R2) reactor and one 1 MWth (R2-0) reactor – located near Nyköping in 1960 to further this goal. (They were operated by Studsvik AB and shut down in mid-2005. Areva is contracted to dismantle them by 2019.)

In 1964 Atomenergi and Vattenfall together commissioned the small (65 MWth and 10MWe) Ågesta heavy water reactor to deliver heat and a little electricity to Stockholm. It operated until 1974. The two organisations then started to build the larger (140 MWe) R4 Marviken heavy water reactor supplied by ASEA, but the project was aborted just before fuel loading.

Following a proposal for a small boiling water reactor (BWR), a Sydkraft-led consortium (OKG AB) ordered a 460 MWe BWR unit – Oskarshamn 1 – from ASEA in 1966. This was the first western light water reactor designed and built without requiring a licence from US vendors. It started up in 1972.

In 1968, Vattenfall ordered Ringhals 1, a 750 MWe BWR from ASEA, and Ringhals 2, an 800 MWe PWR from Westinghouse, in order to compare the technologies. Two further PWRs were built at Ringhals.

In 1969, OKG ordered Oskarshamn 2 and Sydkraft ordered Barsebäck 1 with an option for unit 2, all from ASEA Atom. In the 1970s Vattenfall cooperated with other utilities to build the Forsmark nuclear plant.

Six reactors entered commercial service in the 1970s and six in the 1980s. The 12 reactors were at four sites around the southern coast. One Barsebäck unit closed in 1999 and the other in May 2005. In 2015 it was decided for economic reasons (see Nuclear capacity tax, below) not to complete upgrades to Oskarshamn 2 and to declare it permanently shut down. Sweden now has nine nuclear power reactors providing about 40% of its electricity from 8849 MWe of capacity. Nuclear power produced 77.5 billion kWh in 2004 (51% of total electricity production), 61.3 billion kWh (42%) in 2008, and 61.5 billion kWh (38%) in 2012. The percentage changes from year to year depending on hydro resources following winter precipitation.

Sweden's nuclear power reactors 

Reactor Operatorb Type MWe net Commercial
Oskarshamn 3 OKG BWR 1400 1985 2035 or 2045
Ringhals 1 Vattenfall BWR 878 1976 2020
Ringhals 2 Vattenfall PWR 807 1975 2019
Ringhals 3 Vattenfall PWR 1062 1981 2041
Ringhals 4 Vattenfall PWR 938 1983 2043
Forsmark 1 Vattenfall BWR 984 1980 2040
Forsmark 2 Vattenfall BWR 1120 1981 2041
Forsmark 3 Vattenfall BWR 1187 1985 2045
Total (8)     8376    

Reactor operating licences are not limited in time, but are subject to periodic safety reviews by the regulator, SSM, at least every tenth year.

Sweden's electricity imports have normally balanced exports, with a small net flow in from Norway and out to Finland. In 2005 – a good year for hydro – net exports were 7 billion kWh mainly to Finland and Denmark, while in 2006 – a poor year for hydro – net imports were 6 billion kWh. In response to Sweden's uncertainty, Finland is building a fifth nuclear reactor there. It has recently increased the capacity of its two Swedish-built nuclear reactors by 23% and that of the others by 11%. A new 800 MWe undersea transmission line was built to enable export of electricity to Sweden from Finland's new Olkiluoto reactor.

Nuclear capacity tax

In connection with debate on closure of Barsebäck (see Appendix 1: Barsebäck Closure) in the late 1990s the government imposed a capacity tax on nuclear power, at SEK 5514 per MWth per month, which worked out at about 2.8 to 3.0 ore/kWh (€0.30-0.32 cents/kWh) potentially produced, penalising nuclear relative to other sources. In January 2006, the tax was almost doubled to SEK 10,200 per MWth per month (about €0.6 cents/kWh then). Early in 2008, it was further increased by 24% to SEK 12,684 per MWt (about 60 SEK/MWh) from 2008 – total SEK 4 billion (€435 million, meaning about €0.64 cents/kWh). This is equal to double the staff cost and makes up about one-quarter of the operating cost of nuclear power in Sweden, though in November 2015 Fortum put the proportion at 60% of operating cost. OKG says it amounts to about 20% of its revenue.

In 2014 the new government proposed to raise the tax to SEK 14,770 per MWt per month, or about SEK 70/MWh (€7.50/MWh), and this featured in the April 2015 budget, with parliamentary approval in June. The nuclear industry was then paying about SEK 4.5 billion in tax annually and called for its abolition. After a long process of appeal through Swedish courts, the European Court of Justice in September 2015 ruled that the tax did comply with EU laws.

Vattenfall said that the tax took its operating costs to 32 ore/kWh (€3.4 cents/kWh) and in April 2016 the Vattenfall CEO said: "Abolishment of the nuclear tax is needed in order to secure continued operation of our nuclear power plants... Combined with falling electricity prices, the current nuclear tax is contributing to a critical situation in which none of our reactors are profitable."

After months of negotiation, in June 2016 a framework agreement was announced by the Social Democrats, the Moderate Party, the Green Party, the Centre Party and the Christian Democrats, which will see the tax phased out over two years from 2017. It also allows for the construction of up to ten new nuclear reactors at existing sites, to replace plants as they retire. The Liberal Party and the Left Party withdrew from negotiations and were not party to the agreement.

Vattenfall said that with the abolition of the tax it aimed to reduce its generating cost to SEK 190/MWh (€20/MWh) by 2021, from over SEK 300/MWh in 2014-15.

Sweden also has a very high tax on CO2 emissions: €120/tonne according to* Wind and biomass are generously subsidised with a certificate system.

* IEA tabulates SEK 2626/t carbon tax on coal, which works out to about SEK 1.13/kWh or about the same per kg of CO2 (EUR 12.5 cents).

Boosting nuclear capacity and operational life

The government worked with the utilities to expand nuclear capacity to replace the 1200 MWe lost in closure of Barsebäck 1&2. By the end of 2008, some 1050 MWe had been added to the ten surviving reactors, and by mid-2014, 569 MWe more had been added.

Beyond that, the Swedish grid operator Svenska Kraftnät, in a long-term development plan published in October 2012, noted that the construction of new nuclear generating capacity at Forsmark or Oskarshamn would present problems. It concluded that the Ringhals site would be the most convenient location of any new nuclear power in Sweden. In July 2012, Vattenfall had submitted an application to the Swedish Radiation Safety Authority (SSM) concerning the replacement of up to two of the existing Ringhals reactors with new ones, but without any firm plans to do so.

Vattenfall in May 2013 announced plans to invest SEK16 billion (€1.87 billion) between 2013 and 2017 in modernizing and upgrading the Forsmark and Ringhals plants, as majority owner of both. With the two operating companies, it assessed the additional investments needed to operate the three Forsmark units and Ringhals 3&4 for up to 60 years.

In January 2014 Vattenfall launched a decade-long public consultation on building new nuclear plants, centred on the Ringhals site where the two oldest units there were expected to close in the mid-2020s, but now the plan is 2019-20 due to curtailed investment (see below).

In October 2014 the Swedish Radiation Safety Authority (SSM) announced that by 2020 all operating Swedish reactors must have a "robust permanent installation that includes power supply and systems for pumping of water and an external water source independent of those used in existing emergency cooling systems." This requires substantial engineering.


Ringhals applied to the Swedish Nuclear Power Inspectorate (SKI) for a major uprate on the 915 MWe unit 3, on the basis of steam generator replacement already undertaken, and more to follow as low pressure turbines were replaced in 2007. Early in 2008, it was operating at 985 MWe net. In August 2008, work was completed to allow it to operate at 1050 MWe pending approval by SKI's successor, the Swedish Radiation Safety Authority (SSM). In May 2009, SSM approved test operation at 1045 MWe, and this increased to 1062 MWe by 2012. A further uprate to 1105 MWe is envisaged.

On the older Ringhals BWR unit 1, a 15 MWe uprate was completed in 2007, with another 15 MWe following in 2012. Unit 2 however was downrated by 60 MWe in 2007 to near its original power. The operational life of these two units was curtailed due to low wholesale prices compounding the tax burden on them, and Vattenfall decided to close them in 2020 and 2019 respectively. They produce about 12 TWh/yr, about 8% of Sweden’s total.

Ringhals 4 had a 30 MWe uprate following replacement of its low-pressure turbines in 2007. Exchange of high-pressure turbines and steam generators in 2011 and other work was expected to yield a further 240 MWe, but this did not eventuate at the time. In January 2015 SSM approved trial operation at 175 MWe higher power level.

The total uprate for Ringhals plant was 305 MWe over 25 years to 2014, though potentially some 660 MWe could have been obtained.

In April 2015, Vattenfall, as 70.4% owner, announced that, due to declining profitability and increased costs exacerbated by the nuclear tax, it proposed to close Ringhals units 1&2 by 2020 instead of 2025 as previously planned, despite recent expenditure on improving safety.  In September 2015 Vattenfall said: "Market conditions and the impact of the high output tax have prompted us to limit investments in Ringhals 1&2. The investment decision, which had to wait while talks with E.ON were under way, will not be subject to review." Ongoing investment projects that would have been implemented from 2017 onwards would cease. The final decision to decommission the reactors early was confirmed by the board of directors of the Ringhals plant in October 2015 with E.ON reluctant consent.

Investment plans for units 3 and 4 at Ringhals will not be affected, and the Vattenfall board expects to decide in 2017 on installing independent core cooling systems in them, as required for operation past 2020.


At Forsmark, uprates of around 8% were carried out at each unit in the 1980s. In 2004, low pressure turbines were replaced in unit 3, giving a 30 MWe uprate, and the same was done for units 1&2.

A major uprate program was announced in 2004 by Forsmarks Kraftgrupp. This planned SEK 13 billion ($1.8 billion) program would have added a further 410 MWe to the plant. Following a series of safety concerns, including an incident in July 2006 (see section below on Regulation and safety), the uprate program was delayed.

Upgrading work then began in the latter half of 2009 on unit 2, which would lead to a capacity increase of 120 MWe. This was completed in April 2013, taking capacity to 1120 MWe (1158 gross) at a cost of SEK 1 billion ($118 million). It has been operating at that level since.

The plan was for Forsmark 1 to be uprated by 120 MWe in mid-2011; and unit 3 would get a new SEK 900 million generator in 2014, which would contribute to a 170 MWe uprate. However, following problems with the work carried out on unit 2, it was decided in November 2010 to indefinitely postpone the upgrading of units 1&3. In mid-2014 the high-pressure turbine of unit 3 was replaced, resulting in 17 MWe more power. In November 2014 the company decided to uprate unit 1 by 114 MWe (from 1022 MWe gross) if grid upgrade could be agreed with Svenksa Kraftnat, and to abandon plans to uprate unit 3 (from 1212 MWe gross). In June 2016 Vattenfall's board decided to install independent core cooling systems in the three Forsmark reactors, as required for operation past 2020, with other upgrades. In September 2016 the head of Vattenfall said that the company expected to operate the three Forsmark reactors for a full 60 years.


In 2005, SKI approved a 250 MWe uprate of the Oskarshamn 3 reactor, to 1450 MWe gross, this was confirmed by the government in January 2006, and in September 2009 SSM approved test operation at the uprated level.  The SEK 3.2 billion (€313 million) project involved turbine upgrade by Alstom as well as reactor upgrade, and will extend the plant's life to 60 years. A further three-month upgrade was in mid-2014. In mid-2017 SSM set new conditions for ageing management at the plant, to be implemented in January 2018 and January 2019.

In mid-2009, OKG announced plans to uprate Oskarshamn 2 by 185 MWe and extend its life to 60 years. This was approved by SSM in April 2010 and was then expected to be completed in 2015. After the 638 MWe unit was taken out of service in June 2013, this target date for the final phase of work was then deferred, and in June 2015 postponed indefinitely due to reduced demand. Major work including new turbines has been proceeding more slowly than expected and the unit was to be offline until at least the end of 2015. It was to start delivering the higher power – a 28% increase from 661 to 850 MWe gross – about 2017.

Then in June 2015 majority owner E.ON said it would close unit 2 by 2020, since it has been "in great need of modernization and replacement of components to extend its operating life." E.ON added: "It would require large investments to Oskarshamn 2 to meet new requirements for core cooling which take effect after 2020.” In October 2015 it confirmed that the reactor would not be restarted.

Oskarshamn 1 has had three renovations and uprates, in 1995, 1998 and 2002, but in 2012-13 its capacity utilization was low, apparently due to turbine features. In June 2015 OKG applied for permission to permanently shut down the reactor at an unspecified date, but majority owner E.ON said that that should be between 2017 and 2019. In February 2016 OKG decided it would be mid-2017, and it was closed down in June.

E.ON Sweden said: "The conditions for the electricity market have changed significantly in recent years. Historically and permanently low electricity prices, combined with increased output tax on nuclear power, and additional requirements for extensive investments create profitability issues, particularly for small reactors such as Oskarshamn 2.”  OKG echoed this in October, saying that "there are no prospects of generating financial profitability either in the short or the long term" at either unit 1 or 2.

Finland’s Fortum, which owns 45.5% of the Oskarshamn units, said that "contrary to E.ON's view, we believe that it is possible to continue production from Oskarshamn units 1 and 2 until the end of their planned operational lifetimes.” Furthermore, "the recent modernization investments in Oskarshamn 2 have been carried out with a target to continue production until the end of the unit's lifetime and with increased capacity. Considering the investments made, as well as our strong expertise as a nuclear operator and a global service provider, we see that there are other measures [that could be] taken to ensure safe and reliable production at Oskarshamn 2 till the end of its planned lifetime.”

Sweden's ambivalent energy policy

The Three Mile Island accident in the USA resulted in a decision to call a public referendum in Sweden, to remove the issue from the election campaign late in 1979. The 1980 referendum canvassed three options for phasing out nuclear energy, but none for maintaining it. A clear majority of voters favoured running the existing plants and those under construction as long as they contributed economically, in effect to the end of their normal operating lives (assumed then to be 25 years). Parliament decided to embargo further expansion of nuclear power and aim for closing the 12 plants by 2010 if new energy sources were available realistically to replace them.

The 1986 Chernobyl disaster (first recognised outside the Soviet Union at a Swedish nuclear power station) created some pressure to progress the issue of nuclear decommissioning. In 1988, the government decided to begin the phase-out in 1995, but this decision was overturned in 1991 following pressure from the trade unions.

In 1994, the government appointed an energy commission consisting principally of backbench politicians, which reported at the end of 1995 that a complete phase-out of nuclear power by 2010 would be economically and environmentally impossible. However, it said that one unit might be shut down by 1998.

This gave rise to intense political manoeuvring among the main political parties, all of them minority, with varied attitudes to industrial, nuclear and environmental issues. The Social Democrats ruled a minority government but with any one of the other parties they were able to get a majority in parliament.

Early in 1997, an agreement was forged between the Social Democrats and two of the other parties which resulted in a decision to close the two Barsebäck units, both 600 MWe boiling water reactors constructed by ASEA-Atom and commissioned in 1975 and 1977. They were only 20 kilometres from the Danish capital, Copenhagen, and became a source of contrived concern to the Danes on that account. They were closed in 1999 and 2005 respectively.*

* In 1997, the Swedish government decided to close unit 1 in mid-1998 and unit 2 in mid-2001. Sydkraft, the utility owning Barsebäck, responded by challenging the legality of the decision and made a formal complaint to the European Commission on the basis of unreasonable discrimination. It also negotiated with the Swedish government regarding full compensation in actual generating capacity, not simply money. The result was that the closure of unit 1 was postponed until the end of November 1999 under a complex agreement among the government, Sydkraft and Vattenfall to transfer an interest in the latter's Ringhals plant (one 835 MWe BWR and three slightly larger PWRs) to Sydkraft. Barsebäck 2 continued in operation under a new joint production company, Ringhals AB, in which Sydkraft (subsequently E.ON Sverige) had a 25.8% share (though Barseback 2 contributed only 14.5% of the capacity). Reactor ownership was unchanged. Then in October 2004, after two years of discussion with utilities on the future of the country's nuclear power plants, the Swedish government broke off negotiations and declared that Barsebäck 2 would close in May 2005 after 28 years' operation, regardless of previously-agreed conditions regarding indigenous replacement power. E.ON took full ownership of E.ON Sverige when it acquired Statkraft's 44.6% stake in the company in mid-2008.

The positive aspect of this decision to close Barsebäck is that the other ten reactors gained a reprieve beyond 2010, allowing them to run for about 40 years (i.e. closing 2012-2025) and possibly 60 years, to 2045. 

In the 1970s, it was the Centre Party in Sweden that started the anti-nuclear debate culminating in the 1980 referendum canvassing three options for phasing out nuclear energy. Since then the Centre Party lined up with the three socialist parties on nuclear power, but the three non-socialist parties on other issues. Then, early in 2005 and against a background of increasing electricity prices, the leadership of the Centre Party indicated a substantial reversal of this earlier anti-nuclear position, saying that climate change must be put ahead of nuclear decommissioning. The party abandoned its alignment with the socialist parties on energy policy and fully joined the three pro-nuclear parties, so as to allow nuclear power to continue supplying a major part of the country's electricity. This view was in line with the overwhelming majority of public opinion.

These four parties – the Centre Party, the Christian Democrats, the Liberal People's Party and the (conservative) Moderate Party – formed the conservative-led Alliance for Sweden (Allians för Sverige) coalition and came to power in the September 2006 elections. The coalition was much more in tune with popular sentiment and positive about nuclear power than its predecessor. While no reactors would be closed, planning of new units was not originally on the agenda during the coalition's first term. However, several major reactor upgrades were to be undertaken. In March 2007, the Christian Democrats changed their policy to explicitly disown the phase-out and allow for new reactors being built after 2010. Early in 2008, leaders of the Liberal People's Party called for construction of four new reactors at existing sites as replacements for those which would be retired in the 2020s. They also called for a policy focus on electric vehicles rather than biofuels.

Then, in February 2009, the centre-right coalition government said it planned to abolish the act banning construction of new nuclear reactors2. This was narrowly approved by Parliament in June 2010, though construction will only be at existing sites and to replace the present ten units. This is part of the government's climate program, which stipulates that by 2020, renewable sources should supply half of all energy produced, the Swedish car fleet should be independent of fossil fuels in 10 years, and the country should be carbon-neutral by 2050. In mid 2012 Vattenfall applied to SSM to build two new reactors at Ringhals or Forsmark, though it made clear that a decision on construction was up to ten years off, with the power being required after 2025. Investigations will proceed meanwhile. "Current regulations are such that it is only through applying for a permit for replacement reactors that Vattenfall will obtain some of the answers needed to complete a decision basis," it said.

SSM said that it has launched a project to draw up new regulations for the requirements that will be imposed on new reactors. It expects this work to be completed in late 2014 at the earliest. Once these regulations are completed, Vattenfall will be required to supplement its application on the basis of the new requirements. SSM would then be able to start its review of the application to ensure it complies with the necessary nuclear safety and radiation protection requirements.

Following elections in mid-2014, the junior coalition Green Party in the new government persuaded its Social Democrat partner to set up an energy commission charged with phasing out nuclear power in the country. Social Democrat leader Stefan Lofven had earlier said that nuclear power would be needed for "the foreseeable future", though the Greens campaigned to have two of Sweden's reactors closed in the next four years. The Social Democrats got 31% of the vote in the election, and the Greens 7%. Public opinion polls in the last few years had shown steady majority (over two-thirds) support for nuclear power.

The two parties said in separate, but identical statements that nuclear power should be replaced with renewable energy and energy efficiency. The goal, they said, should be at least 30 TWh/yr of electricity from non-hydro renewable energy sources by 2020, compared with about 18 TWh/yr now. The two parties said that nuclear power "should bear a greater share of its economic cost", despite Sweden’s unique high tax specifically on nuclear power (about €0.67cents/kWh) already, and waste management being fully factored into running costs at €0.436 cents/kWh. At Ringhals, the tax amounts to twice the salaries of all employees.

Public opinion

Public opinion in Sweden has been much tested. The first point to note is that the 1980 referendum did not canvass any option for continuing Sweden's nuclear power program, only for different ways of shutting it down. Many wish it had the positive option, just to provide a benchmark.

Since then however public opinion steadily strengthened in favour of nuclear energy.

In April 2004, 77% of people gave top environmental priority to restraining greenhouse gas emissions, 13% to protecting unspoiled rivers from hydroelectric development, and only 7% to phasing out nuclear power. On nuclear power matters, 17% supported a nuclear phase-out, 27% favoured continued operation of all the country's nuclear power units, 32% favoured this plus their replacement in due course, and 21% wanted to further develop nuclear power in Sweden. The total support for maintaining or increasing nuclear power thus was 80% as the government tried to negotiate a phase out. This total support had risen to 83% in March 2005, with a similar proportion saying that limiting greenhouse gas emissions should be the top environmental priority.

With slightly different questions, total support for maintaining or developing nuclear power was 79% in June 2006 and fluctuated around this to June 2008 when it was 82%, comprising 40% who favoured expanding nuclear capacity and 42% who favoured continuing to operate present plants but not building more. A self-assessed 18% (26% of men, 11% of women) said in November 2007 they had become more positive towards nuclear power in the light of concerns about climate change, while 7% (4% of men, 10% of women) said they had become more negative. This may be related to 14% who thought that nuclear power was a source of CO2 with a large impact on the environment (8% of men and 21% of women)!

By February 2010 however, the positive opinion had diminished. A poll (N=1500) on behalf of the country's electricity-intensive industries showed 30% support for replacement of the current fleet of reactors as they reach the end of operating lives, plus 22% who also favoured building new reactors. Some 45% preferred a phase-out of nuclear energy. However, when asked which source of energy is best for both employment and climate, nuclear was the most popular answer, with 26%, followed by wind (21%), hydro (18%), solar (14%) and biofuels (12%)3.

In late June 2010, a survey (N=1008) commissioned by the Liberal Party was reported to show overall 72% support for the government decision to allow building of new reactors, with 28% opposed4. Even among Social Democrats, who have threatened to reverse the decision if elected later in 2010, 66% of supporters were in favour of new build.

In May 2011, immediately after the Fukushima accident, a Novus poll (N=1000) commissioned by the KSU showed 33% support for continuing to use nuclear power and replace existing reactors, 36% for continuing to use existing reactors and 24% wanting to phase out by political edict. In August 2010 there had been 40% support for use and replace and only 19% for phase-out.

In May 2013, the same Novus poll showed 38% support for continuing to use nuclear power and replace existing reactors, 30% for continuing to use existing reactors and 21% wanting to phase out. This changed little to October 2013, with figures 35%, 33% and 22% respectively. The series of Novus polls since 2010 show men much more positive than women, typically over 75% compared with about 60% for women.

Nuclear fuel cycle

Sweden imports most of its nuclear fuel, including all enrichment. In the case of Forsmark, these have been provided: 20% Eurodif (diffusion), 60% Urenco, 20% Tenex (both centrifuge) – over 90% of energy input being from nuclear power.

Westinghouse has a fuel fabrication plant at Västerås, which produces about 400 tonnes of BWR and PWR fuel per year, supplying European countries and Ukraine. Vattenfall sources fabricated fuel from Westinghouse, Areva in France and TVEL in Russia.

Sweden has some uranium mineralisation but no mines. The 2011 edition of the IAEA-OECD ‘Red Book’ shows resources of about 600,000 tU in Sweden’s alum black shales (schists) in two deposits. Some 200 tU was produced from a black shale deposit in Ranstad in the 1960s. Another deposit is Pleutajokk, near the Arctic Circle. Canada's Azarga Metals (formerly European Uranium Resources/Tournigan Energy) was investigating the Hotagen district of northern Sweden in 2012 and has identified several small deposits.

Australia's Aura Energy in August 2011 announced JORC-compliant inferred resources of 243,000 tU at 0.014%U in the alum black shales at Häggån about 40 km southwest of Östersund in central Sweden. Molybdenum, nickel, zinc and vanadium are present and are potential co-products. The Häggån deposit is flat, with low mining costs, and though amenable to acid leach it has high carbonate levels, so bacterial heap leaching is being investigated. (Talvivaara Mining in Finland is planning to recover uranium by-product from bio-leaching similar black shale ore.) A scoping study confirmed the economic potential of bio heap leach producing 3000 t/Uyr plus nickel and molybdenum, but at the end of 2013 a smaller initial operation was being proposed. In February 2013 Aura announced that it had accepted Areva Mines as strategic partner in the project and had entered a binding co-operation agreement, but Areva later pulled out of this. Expected production costs even for the smallest scale operation (385 tU/yr) are in the lower half of 2010 industry cost curve, under $25/lb U3O8 after by-product credits. Production costs for the large operation are put at $13.50/lb.

Waste management

Sweden has its nuclear waste management well in hand. A full review on financing was headed by the Swedish Radiation Safety Authority (SSM) and included the Swedish National Council for Nuclear Waste – a government advisory organization, and the Swedish National Debt Office. The government responded to its report at the end of 2014.

The Swedish Nuclear Fuel and Waste Management Company (Svensk Kärnbränslehantering AB, SKB) was set up by the nuclear utilities following the Waste Legislation (Stipulation Act) in 1977 to develop a comprehensive concept for the management and disposal of used fuel and other radioactive wastes. It is owned 36% by Vattenfall, 30% Forsmark, 22% OKG and 12% E.ON Sweden. It reports on its R&D program every three years, and the government must approve this. SSM recommended approval of the 2016 report in March 2017.

Nuclear generators are responsible for the costs of managing and disposing of spent fuel, and must provide for those costs as they go. They pay a fee set by the government to a state fund administered by SSM to cover waste management and decommissioning. This is based on advice from SKB and has averaged SEK 0.02/kWh (0.21 Euro cents/kWh). In 2011 SSM recommended an increase in the fee due to estimating that SKB's deep SFR repository would cost more than anticipated. In 2010 SKB estimated that the total cost for wastes and decommissioning would be SEK 123 billion, and said that the fund had SEK 43 billion in it then. In December 2011 the government announced that the fee would be SEK 0.022/kWh (0.32 cents US, €0.24 cents) for 2012-14, compared with the SSM recommendation then of SEK 0.03.

However, in June 2013 SSM said that the charges should be based on 50-year reactor lifetimes, not 40-year ones as at present, so the fee could be maintained. In October 2014 SSM recommended that the fee be increased to SEK 0.04/kWh (€0.436 cents), since it thought SKB had underestimated the cost of decommissioning and building the repository by at least SEK 11 billion. The government confirmed the new fee level for 2015-17 in December 2014. SKB estimates the decommissioning and repository costs at about SEK 78 billion.

Some low-level waste is disposed of at reactor sites, and some is incinerated at the Studsvik RadWaste incineration facility in Nyköping.

SKB's dedicated ship, M/S Sigrid, moves the used fuel and wastes from power plants to storage or repositories. In 2014 it replaced the smaller Sigyn.

A final underground repository (SFR) for operational (up to intermediate-level) radioactive waste and medical and industrial radioactive wastes has been operating near Forsmark since 1988. It has 63,000 cubic metre capacity and receives about 1,000 cubic metres per year. This was also one of the locations proposed by the local Östhammar community for a final high-level waste (HLW) repository. It is some 50 metres below the Baltic Sea.

High-level waste

The CLAB interim repository for used fuel (treated as high-level waste) has been operating since 1985 at Oskarshamn, and its original 5,000 tonne capacityd was expanded to 8000 tonnes soon after 2000, and in 2015 SKB applied to extend it to 11,000 tonnes to cater for all the fuel from all the present reactors. The used fuel is stored under water in an underground rock cavern for some 40-50 years. It will then be encapsulated in copper canisters with a cast iron internal structure for final emplacement packed with bentonite clay in a 500 metre deep repository in granite. In mid-2015 about 6,000 tonnes of used fuel was at CLAB.

Research at the Äspö Hard Rock Laboratory nearby identified geological characteristics for this final deep repository. Site selection procedures from 2002 resulted in two municipalities voting to be candidate locations for a deep geological repository – Oskarshamn (Simpevarp and Laxemar) and Östhammar (Forsmark). Both these had been selected as having potentially suitable bedrock characteristics, after feasibility studies in eight municipalities. An April 2008 independent poll in both communities (N=900 in each) showed that 83% of Oskarshamn residents and 77% of those in Östhammar supported having the future repository in their own locality. Six neighbouring localities were also surveyed in 2008 and, while the majority of residents were in favour of a final repository in the neighbouring municipalities, support diminished as distance from ongoing nuclear power operations increased.

SKB announced its decision to locate the repository at Soderviken near Forsmark in Östhammar municipality, on the basis of it having the best geology, in June 2009. In April it had signed an investment agreement with both volunteer municipalities specifying investment of SKR 2 billion (US$ 245 million) in the two, with the majority going to the unsuccessful bidder, which will thereby be disadvantaged financially. SKB applied for a licence to construct the repository in March 2011, and planned to begin site works in 2013. In June and November 2015 SSM responded with preliminary findings that the plan should meet all its safety and radiation protection requirements, both in operation and following closure.

SKB applied for a permit to build the Clink encapsulation plant next to CLAB at Oskarshamn in November 2006. This will be operated with CLAB, as an integrated facility. Encapsulated used fuel will make its last journey from here to the repository at Östhammar. In June 2012 an OECD Nuclear Energy Agency review reported to the government that SKB’s whole repository concept was sound and met long-term safety requirements. In March 2016 SSM expressed a positive opinion of SKB plans for the integrated CLAB-encapsulation facility.

In June 2016 SSM assessed that SKB's licence application including encapsulation plant and Forsmark repository had the potential to comply with its requirements, and recommended to the Land and Environment Court in Stockholm that it should be allowed. In January 2018 SSM submitted a positive opinion to the government on SKB's application. However, the Land and Environmental Court called for further documentation on the copper canisters in which the fuel will be stored. SKB plans to start construction of the repository as soon as the government issues a permit, which is expected in the early 2020s.

The repository will have 12,000 tonnes capacity at 500 metres depth in 1.9 billion year-old granite. A 5 km ramp will connect to an eventual 60 km of tunnels over 4 sq km, housing 6000 copper-cast iron canisters containing the used fuel. Each 25-tonne canister will hold 2 tonnes of used fuel. Bentonite clay would surround each canister to adsorb any leakage. The repository concept is known as KBS-3. KBS-3H has canisters horizontally, KBS-3V has them vertically.

Some 4.8 tonnes of metal used fuel from the R-1 research reactor has been sent to the UK's Sellafield for reprocessing in the Magnox reprocessing plant, since it cannot safely be stored long-term. Plutonium from this will be combined with the small quantity (825 kg) from reprocessed Oskarshamn fuel (reprocessed in 1997 under a 1969 agreement) and either returned as MOX fuel or used in the UK as MOX fuel. The reprocessed Oskarshamn uranium was recycled as fuel for that plant.


Six power reactors – Ågesta, Marviken (never operated), Barsebäck 1&2, and Oskarshamn 1&2  – are being decommissioned, along with three research reactors – R1, R2 and R2-0 at Studsvik's Nyköping site. R1 has now been dismantled.

Swedish reactors being decommissioned

Reactor Type Net capacity MWe Commercial operation
Ågesta Prot HWR 10 1964 - 1974
Barsebäck 1 BWR 600 1975 - 1999
Barsebäck 2 BWR 600 1977 - 2005
Oskarshamn 2 BWR 638 1974 - 2013
Oskarshamn 1 BWR 473 1972 - 2017

SSM has a Studsvik Fund to finance the decommissioning of research and development facilities from when nuclear power was built up in Sweden, and disposal of waste from these. In September 2015, SSM raised the levy on delivered electricity from 3.0 to 4.0 ore per kWh for 2016-17, to avoid a deficit in the fund of about SEK 142 million by the end of 2017. In 2017, SSM recommended a further rise to 5.0 ore per kWh for the period 2018-2020. SSM stated that the increase was necessary to avoid a shortfall due to the early retirement of Vattenfall and OKG units.

Oskarshamn 2 was shut down in October 2015, and GE Hitachi Nuclear Energy (GEH) has been contracted to dismantle its internals from 2018 to 2020. Oskarshamn 1 was finally shut down in June 2017, fuel will be removed by the end of 2018, and GEH will dismantle it from 2019.

See also information page on Waste Management in the Nuclear Fuel Cycle Appendix 3: National Policies.

Nuclear R&D

Studsvik is a public company whose origins were in 1947 as a largely state-owned enterprise. In the 1960s, it relocated from Stockholm to Nyköping, focused on pure R&D and subsequently it became industry-funded and owned. In the 1990s, it became an international enterprise.

Studsvik's 600 kWth R1 research reactor operated 1954-70. R2-0 was a 1 MWth research reactor which operated from 1960-2005. R2 was a large (50 MWth) test reactor which operated 1960-2005. Both R2 and R2-0 were used for isotope production.

The R2 test reactor was involved with international research programs testing reactor fuel elements. It used high-enriched fuel supplied by the USA and with used fuel returned to the USA. In collaboration with CERCA in France the company was working on qualifying a high-density U-Mo fuel to enable low enrichment to be used. However, R2 was shut down in mid-2005 and its work taken over by the 20 MWth Halden heavy water reactor in Norway, operated by IFE.

Ågesta (10 MWe plus 65 MWt district heating) was built as a prototype heavy water power reactor which if necessary could serve as a stopgap source of plutonium for Sweden's nuclear arsenal (which had been proposed in the 1950s). It was also known as R3 and operated 1964-74. The Marviken (R4) heavy water reactor outside Norrköping was intended for research plus power generation (140 MWe) and plutonium production but was never fuelled or operated, and work was abandoned in 1970 after six years' construction.

Government-funded R&D totalled SKR 10.5 million in 2007, focused on reactor safety as well as ensuring that Sweden maintains competence in the nuclear industry. A ban on nuclear research was removed in 2006.

Regulation and safety

An Atomic Energy Act was passed in 1956, followed by a Radiation Protection Act in 1958. The Atomic Energy Act and several others were superseded by the Nuclear Activities Act in 1984.

In the 1960s the Swedish Nuclear Power Inspectorate (SKI) was set up and became responsible for licensing, regulation and supervision under the Nuclear Activities Act. Its three divisions were reactor safety, safeguards, and research. The Swedish Radiation Protection Institute (SSI) operated under the Radiation Protection Act 1988. In mid-2008, the two organisations were merged to become the independent Swedish Radiation Safety Authority (SSM) encompassing both radiation protection and nuclear safety regulation.

In 2010 SSM commenced preparations for introducing a licensing process for new nuclear power reactors.

In July 2006, a safety-related incident at Forsmark received a lot of media coverage. It was eventually assigned a rating of Level 2 on the International Nuclear Event Scale (INES). Following a request by management of the three nuclear plants, in March 2007 the director of the International Atomic Energy Agency's Operational Safety Section met with representatives from SKI and the Swedish Radiation Protection Authority as well as management from the three plants and the Environment Ministry. This was to discuss safety culture problems and to arrange Operational Safety Team Review (OSART) missions to the Swedish reactors, the first being to Forsmark.f

The nuclear training and safety centre (Kärnkraftsäkerhet och Utbildning AB, KSU) is a vital ancillary organization and is responsible for training staff and for liaison with the World Association of Nuclear Operators (WANO). It is part of Vattenfall but owned by all the power plants. The Analysis Group, focused on nuclear safety and with a public information role, is administered by KSU.


Sweden is a party to the Nuclear Non-Proliferation Treaty (NPT) as a non-nuclear weapons state. The country signed the Treaty in 1968, when it cancelled the country's research into nuclear weapons that had begun after the end of the Second World War. Its safeguards agreement under the NPT came into force in 1975 and in 1995 it came under the Euratom safeguards arrangement. In 1998, it signed the Additional Protocol in relation to its safeguards agreements with both IAEA and Euratom.

Notes & references


a. Total domestic electricity production of 140.314 TWh for 2006 comprises: hydro: 61.192 TWh (43.6%); nuclear: 64.983 TWh (46.3%); conventional thermal: 13.151 TWh (9.4%); wind: 0.988 TWh (0.7%). In addition Sweden had net imports of 6.05 TWh (17.547 TWh imported and 11.497 TWh exported) in 2006.

Total domestic electricity production of 144.708 TWh for 2007 comprises: hydro: 65.591 TWh (45.3%); nuclear: 64.279 TWh (44.4%); conventional thermal: 13.406 TWh (9.3%); wind: 1.432 TWh (1.0%). In addition Sweden had net imports of 1.315 TWh (16.051 TWh imported and 14.736 TWh exported) in 2007.

Total domestic electricity production of 145.9 TWh for 2008 comprises: hydro: 68.4 TWh (46.9%); nuclear: 61.3 TWh (42.0%); conventional thermal: 14.2 TWh (9.7%); wind: 2.0 TWh (1.4%).

Source: Statistics Sweden (Statistiska centralbyrån, SCB) website (


  • Oskarshamn (Oskarshamns Kraftgrupp, OKG) is owned 54.5% by Uniper Sweden (formerly E.ON Sverige) and 45.5% by Fortum.
  • Ringhals is owned by Vattenfall 70.4% and Uniper Sweden (formerly E.ON Sverige) 29.6%.
  • Forsmark (Forsmarks Kraftgrupp) is owned by Vattenfall 66%, Mellansvensk Kraftgrupp 25.5%, and Uniper Sweden (formerly E.ON Sverige) 8.5%.

The Uniper Sweden (formerly E.ON Sverige) subsidiary responsible for nuclear power generation is Sydkraft Nuclear Power AB (formerly E.ON Nuclear Power Sweden – Sydkraft was the name of E.ON Sverige to 2005).

In September 2017 E.ON said it was in advanced negotiations with Fortum to sell its 46.65% share of Uniper. This would give Fortum full ownership of Oskarshamn. [Back]

c. Upgrading work on Forsmark 2, including installation of new high pressure turbine modules, was carried out in 2009. However, the work took longer than planned and the unit had to operate at reduced power for much of 2010 due to intense vibrations at the turbine inlet valves. Eventually, at the end of September 2010, the inlet valves were replaced and the unit returned to full power in November.

d. The original 5000 t capacity at CLAB allowed for 20,000 BWR fuel assemblies and 2,500 PWR assemblies. [Back]

f. Information on the Forsmark incident was available on the Vattenfall website, including: Forsmark nuclear power plant shut down after incident news release (8 August 2006); IAEA Concludes Operational Safety Review of Sweden’s Forsmark Nuclear Power Plant news release (28 February 2008). See also: Report of the Operational Safety Review Team (OSART) Mission to the Forsmark Nuclear Power Plant Sweden 12-28 February 2008, Division of Nuclear Installation Safety, International Atomic Energy Agency, Operational Safety Review Mission IAEA-NSNI/OSART/08/145. [Back]


1. Electricity data from International Energy Agency's Electricity Information 2018 [Back]

2. Sweden reverses its nuclear phase out, World Nuclear News (5 February 2009) [Back]

3. Majority of Swedes support nuclear energy, World Nuclear News (17 March 2010) [Back]

4. Support for new nuclear reactors grows: survey, The Local (10 July 2010) [Back]

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