You don't necessarily need batteries to store energy. For instance, see https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity https://en.wikipedia.org/w

You don't necessarily need batteries to store energy. For instance, see https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit....