Iceland, Norway come to mind as the obvious poster childs for hydro and geothermal and probably there already. If you count nuclear (and why not), France is another big one and even they are replacing nuclear with renewables.
Countries like Denmark, Sweden the UK, , come to mind as places that are closing in on (or over) 50% at this point and have ambitious targets of getting pretty much to 100% by next decade or so.
In many other markets (e.g. Germany, China, the US) renewables are either or both the fastest growing form of energy or the largest (by kwh) form of energy (typically displacing coal recently or in the near future). These will take longer but are probably going to close in on the 50% mark by the end of the decade nevertheless.
I'm really interested in this progress, can you enumerate just a handful of these places.