Sweden has about the best options possible for a renewable powered grid. 40-50% of the electricity comes from hydro currently, simply transition that to be less baseload and more dispatchable, and Sweden now has days of storage.

Couple that with off-shore wind in one of the windiest places on earth[1] together with solar during the summer wind lulls and you have all you need.

This is why storage is not being built in Sweden, energy is simply too abundant and cheap.

[1]: https://globalwindatlas.info/en