Most countries are pretty far away from the amount of renewables where you start requiring lots of storage. You can easily do 50% renewables for electricity with hardly any storage at all.
“Without technological breakthroughs in efficient, large scale energy storage, it will be difficult to rely on intermittent renewables for much more than 20-30 percent of our electricity.” Steven Chu, Secretary of Energy - 2010.
https://grist.org/article/2010-02-22-energy-secretary-steven...
https://en.m.wikipedia.org/wiki/List_of_countries_by_renewab...
Norway has a lot of hydro which they used the revenues from North Sea oil to install. (Their geography and population density also helps.)
I don't know, that's pretty impressive. Maybe they have international connectors with other countries? I think Germany buys Nuclear power from France? or maybe they have a super stable kind of wind.