The technologies are there. I was part of a project in Russia, where they planned to build the unit. They used foreign technologies. You are obviously familiar with this technology. Is it more dirty than coal burning power plants?
My familiarity with the technology is minimal. But I find it hard to believe that coal can’t be burned in a non-polluting (or reduced polluting) manner with technology.
A block from my home is a recreation area paved over with asphalt, containing three basketball courts (I play there a couple of dozen times a year) and a skateboard facility. It is paved over because it is the site of a former coal gasification plant that was closed down long ago, probably in the 40s or 50s. There are toxic pollutants that escape from the soil. There are a few small monitoring wells with brass covers; I assume that they test the levels from time to time. So before committing to that function we need to be sure not to repeat the mistakes of the past.