ChatGPT & DALL-E panoramic image of a cavern underground full of water with an engineer in a hard hat looking at it and scratching her head.

Compressed Air Storage Redux — LightSail & Hydrostor

The other day, I published my doorstop assessment of the thermodynamics and operational challenges that limit compressed gas storage solutions, pushing them into the 100 GW of also-ran capacities. In comments in various places, people reminded me of the long-defunct LightSail and the now-getting-press Hydrostor. A bit of followup with … [continued]