Egregoros

you may like this website @parker
https://solar.lowtechmagazine.com/2018/05/history-and-future-of-the-compressed-air-economy/

@billiam Thank you, very cool article. I'll add some of their design section to my library.

@billiam @parker Unfortunately, compressed air just isn't practical for a decent amount of energy storage, as you need a large amount of volume to store a reasonable amount of power.

It seems pumped hydro or even just weights at such sizes stores comparable energy.