Importers and producers are required to be a member of a approved company handling returns, like RENAS[2].
Shops selling EE goods are required to accept returned EE goods from individuals of the type they sell. So if you sell fridges you have to take my old fridge and handle it in accordance with the rules.
Seems to work better than nothing, though how well I don't know. As with all such regulations there's money to be made by skipping steps, and some do[3].
[1]: https://www.miljodirektoratet.no/ansvarsomrader/avfall/Retur...
[2]: https://renas.no/
[3]: https://www.miljodirektoratet.no/publikasjoner/2022/februar/...