For instance, Washington State could certainly do the same thing, the majority of our electricity comes from hydroelectric. But while hydro plus wind could probably cover all of Washington, we’re just a small part of the US and most parts of the US don’t have untapped hydro potential they could bring online.
The point is some regions have features that make them particularly suited for renewable energy. That some of these places are small countries and others are subnational doesn’t mean anything, engineering-wise.