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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.
You can check it out in real time here: UTE Generation Biomass is not something so actively sought, it's more of a consequence of other industries here. You are correct that we have other renewable sources that work when wind is not on its peak. There are two hidro plants that can work when demand is large and wind is not on its peak, and they've managed to keep this regime even on dry or draught conditions.
I'll have to check later. It seems like the page is down, I'll get back to you. thank you!