I think there are a number of reasons. First, carbon capture and storage has been around for a while, but it's not been proven to be commercially viable at scale and actually this total sum of CO2 captured and fully sequestered on geological time frames is very limited.
The second part is this. What is the cost of doing that? Would it actually be cheaper to substitute that coal power generation with renewables, whether that's wind, solar or other forms of generation, particularly if then that CCS is being subsidized through state or public funds? Actually, by either economic diversification or helping support the transition towards a greener system, that money would be better spent rather than just in CCS.