Due to the same "green" politicos having been in power the last 8 years [1]. The power plants they closed could have been kept in service - they had been recertified up to 2035 - but they closed them anyway. This was a political decision, not one based on demand - support for nuclear power has surged in Sweden - or technological deficiencies.
Nuclear power in Sweden was expensive due to the "effektskatt" [1] (power output tax) which was levied specifically on nuclear power, ostensibly to pay for dismantling nuclear power plants after they were shut down. This tax made up about 25% of the production costs in the end [2].
The taxes and additional payments into the special fund established for this purpose [1] already cover the prospected costs of dismantling all nuclear power stations and treating/storing the waste (spent fuel as well as materials from dismantled reactors). While the additional "effektskatt" has been abolished in 2018 the payments to SKB continue. The total costs are estimated to end up at 171 billion kr allowing for a safety margin and taking price increases into account. Remaining costs as of 2024 are estimated to be 124 billion kr. The fund currently holds 80 billion kr, the additional 'effektskatt' brought in 38.5 billion kr, securities posted by the companies which run the nuclear power stations stand for another 59 billion kr. Payments into the fund continue, the proceeds of which are invested in state bonds and on the stock market. Even without these continuing payments and investments and disregarding compound interest the costs for dismantling current reactors and treating all waste has been paid already. As it stands the plan is for the remaining reactors to run until ~2045 [2]. Payments into the SKB fund will continue so by the time the last reactor is shut down the costs will have been paid several times over.
And yet power plant closures were entirely due to politics, not the cost.
Now the price of energy in Sweden quintuples depending on demand: https://www.statista.com/statistics/1271491/sweden-monthly-w... I am just so glad that the expensive energy is out of the picture. (That was sarcasm, I chose to pay for electricity coming from nuclear, and it's not meanigfully more expensive than other types)
