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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.
Yes, in rather large amounts since we aren't always self-sufficient (even with fossil gas).
Almost all of continental Europe is part of one, synchronous grid. Right now I'm using electricity simultaneously being produced in Belgium, Portugal, Ukraine, Turkey, and even Morocco; although for accounting purposes we calculate the difference at the border, electrons don't care.