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‘Energy independent’ Uruguay runs on 100% renewables for four straight months
(theprogressplaybook.com)
This is a most excellent place for technology news and articles.
Well, not every country has wind farms or water turbines as viable option. You know, geography and stuff...
So which country has neither wind, water nor sunshine then?
For example Czech republic, Slovakia, baltic states, maybe Finland. It's not like there's none of these available. It's they're not really viable/meaningful options, yet. Sure you can build solar, but with nearly no sunlight in winter it's almost useless for half the year...
Vatican City /s
I think that there are constraints for certain countries, but the majority probably could. And when they can't, it should be solved by cooperation and trade, IMHO.
Then maybe those countries shouldn't exist.
Though that's based solely on your example.