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Gas, coal, nuclear, hydro, and geothermal all operate more or less continuously and can “easily” vary output.

Solar, wind, and to an extent tidal generators don’t, so you want to store the excess charge they produce while they are able to and release it to the grid when needed.

It’s not that the batteries don’t work with other power sources, it’s just that they’re less necessary (although large batteries in the grid can buffer against sudden changes in grid demand more rapidly and efficiently than grids without)

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