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Superfluous renewable energy already has to go to hydrolysis to produce hydrogen to be saved for times whenever renewables don't produce energy.

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Actually battery storage and stored hydro work. As does long duration battery storage options that are in the works now.

They don't work nearly as well enough or in the case of hydro storage are available in enough quantity to cover a month of weak wind.

For example. The US would consume its entirety of pumped hydro storage in a third of a day.

Superfluous energy should go to the consumer which otherwise would consume the most CO2. We do not need to use hydrogen when renewables aren't available (if such a situation should arise). We can continue to use fossils for these (rare) situations.

The only thing which matters is to use energy in the most CO2 efficient way to achieve goals overall.

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