> Not burning the gas but using it as a compressed gas battery. It liquifies easier than air, etc., but would be a big fire risk if there were leaks while this is not.

FWIW Back in the day, Ammonia was used for refrigeration because it had the right properties for that process; I mention that one because while it's not a fire risk it's definitely a health risk, also it's a bit more reactive (i.e. leaks are more likely to happen)

> Seems neat.

Agreed!

Maybe use excess power to produce methane via the sabatier reaction, store that, and then burn it in turbines or use it in fuel cells when needed.

It’ll be interesting to see how the economics of these various solutions play out.

Except you have to trap and recycle the uncompressed CO2, hence that enormous bag to hold all that gas. Color me skeptical.

With compressed air, you just release the air back to the atmosphere.