CCS has a lot of hidden costs:
- The cost of transportation and storage, at least an extra $10 per ton carbon
- The extra mining of coal, as CCS uses more coal to power the required processes, releases methane. On a CO2 equivalent basis this will reduce the amount of net captured CO2 and drive up the per ton cost
- The cost of the extra power if it were sold at retail costs
- Maintenance and wear and tear on big, complex, pieces of equipment
So, probably well north of $100 per ton CO2 equivalent, say $130+. Probably why CCS has completely stalled and seems to have no chance of the grandiose build out assumed in the UN IPCC scenarios. We simply have to cut coal use rapidly (and not replace it with natural gas which is just as bad once you count the fugitive methane emissions).
Of course, this will not happen in the US with a Trump administration. Wasn't happening anywhere near fast enough under an Obama administration, The recent falls in natural gas prices in the US will simply drive electricity generation from coal to natural gas.