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Australia struggling with oversupply of solar power
(www.abc.net.au)
This is a most excellent place for technology news and articles.
Germany has more than 3 times the population of Australia, and the article linked needed to be able to generate 30GW peak so likely required more installed capacity, and solar is only 1 element out of 5 required in that scenario.
Again it does seem to be feasible to get renewable only in Australia (or close to) but I dont think that tells you much about elsewhere