When will the new legislation go into effect?

The new legislation is proposed to go into effect as of January 1, 2026.

Source:  Regeringen, “Förbudet mot utvinning av uran tas bort”, https://www.regeringen.se/rattsliga-dokument/lagradsremiss/2025/06/forbudet-mot-utvinning-av-uran-tas-bort/