Absolutely. The old night storage heaters were, in essence, doing what a lot of people are doing now with their home battery systems. Take energy while it is cheap and feed it back when you need it.dont forget batteries come in many types.
for heating for instance, sand and stone (or actually properly designed materials which will have a much higher density still) can be used as "batteries".
not all batteries are what we automatically think of. essentially that is what pumped storage is, a massive water battery.
Hydro (via pumped water), stored heat and hydrogen production are all great ways of storing excess renewables in addition to electrical batteries.
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