> Parent suggested that Sweden would not need fossil fuels when using nuclear power to stabilize their grid.

That’s not “nukes as the sole source of electricity”. Sweden has huge amounts if hydro, it accounts for 50% of their productions.

> Still, even in the days you picked, they are running 5% on gas.

How much of that is cogeneration? You can’t shut off a cogeneration plant, it does not just produce electricity.