Hydropower storage is geographically limited. Chemical storage is not available at the scale required. Plus most batteries produced are going to EVs. Remember,

Hydropower storage is geographically limited. Chemical storage is not available at the scale required. Plus most batteries produced are going to EVs. Remember, the world uses ~60 TWh of energy per day. And it's not not the day and night cycle that needs to be smoothed out, it's also seasonal fluctuations that can last for weeks. All the other options haven't been built at scale. Hydrogen storage, giant flywheels, compressed air have all been suggested, but aren't deployed widely enough to prove viability.