I was told by someone who went to a university talk about the grid that there's a theoretical limit to the percent of grid power that can be from solar grid ties. If it was over some percent, the grid would become unstable, and in practice, it was actually less than the theoretical percent. But the talk was about how the speaker had invented a way to build some inertia into the software, so it wouldn't have the same stability issues. I don't think it's used in general right now.
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