And if you were storing CO2 I suspect the first question is how do we liquify it. So the advantage fades away. edit: You'd probably want to store the electrici

And if you were storing CO2 I suspect the first question is how do we liquify it. So the advantage fades away. edit: You'd probably want to store the electricity on-site instead for this. At least if there's no CO2 to consume you can be in the electricity storage business.