This is cool, but one thing to consider is that you're not going to be getting that CO2 from the atmosphere, but from captured emissions. When that plant is decomissioned, the path of least resistance is to just vent it.
If you've already got pure CO2 in a tank, sequestering it is a much easier problem. The hard part is capturing it out of smokestack emissions or (especially) directly from the atmosphere as it's much more diffuse.