There was a company trying to do compressed air with good efficiency but they aren't doing so well right now https://www.greentechmedia.com/articles/read/light

There was a company trying to do compressed air with good efficiency but they aren't doing so well right now https://www.greentechmedia.com/articles/read/lightsail-energy-cheap-compressed-air-storage-hibernation https://www.greentechmedia.com/articles/read/lightsail-energ...