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So, a few thoughts on this. If you consider the minimum on any of these graphs as a kind of base load capacity, you would need to build enough solar and wind to cover what's demanded by the population. The fluctuating part above that line is excess which maybe might find some sort of opportunistic use but will more likely be discarded. I guess the industry term for this is curtailment.

The more you invest in storage, the less you will need to curtail. But given that even with a month worth of storage (which is a colossal amount if you crunch the numbers), there will be some curtailment, my takeaway from this is that there is room for synthetic fuel production like green hydrogen that would kick in once you've saturated all your batteries, pumped hydro, etc. I'd been wondering about this. There is energy loss (relative to say batteries) in making fuel out of electricity, but the energy in this case is essentially free, so why not give it a go? And we are really good at stockpiling fuels. The amount of energy stored that way around the world is orders of magnitude beyond everything else combined.