Comment by nine_k
3 hours ago
> perfectly reversible, but that uses a lot of energy
Looks like a perfect match to a solar plant, which provides basically free energy periodically. All you need is a large enough cistern to hold the liquid during night time.
Yes, it's a great match to solar plants.
But you don't need to store the capture medium. You use a bit more energy to make they work faster while the Sun is shining, and stop everything when it's gone.
The largest bottleneck is what you do to get rid of the CO2.