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I expect utility electricity solutions to be eclectic.
There likely is a role for batteries to play, and it's probably to smooth rapid changes in electricity supply / demand for a few seconds to tens of minutes at a time.
Even larger capacity energy storage solutions will be required, and they will need to be cost competitive. It's absolutely necessary if conventional generation is to be displaced with renewables. Another possibility is to have grids so interconnected and dynamically responsive that surplus can be transported to where demand is.
Or, we could just have nuclear. I wonder what CO2 emissions would look like today if Chernobyl never happened?
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