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Grid level batteries can be used to mop up the extra power from either rooftop or grid level solar. You dont need to use powerwalls just because the solar is on roofs.

And utility solar is much cheaper then rooftop solar. But if people dont know any better or wont wait for governments to build it then we will end up with more expensive solar then we should have. But if we already have enough of it then there is no need for nuclear in any case is there? And if we dont have enough of it we build cheap grid and solar batter units combined and the private owner makes its money from owning the battery and selling power at night back to the grid at a price that in combination with the solar makes a reasonable profut but is still cheaper then nuclear power.