Longannet PS have a small pilot CCS running capturing a very small proportion of the flue gases. When I was there about a year ago I asked if it was scaled up in its existing state to capture all the gases how much power would enter the grid. The answer, very little.

The chemistry is based around amines removing carbon post-combustion and these chemicals are being improved but theres a long way to go.

It was a similar story at Peterhead PS, where it was planned to remove the carbon pre-combustion. The newer plant there is efficient , around 40% I think, but the theoretical efficiency would easily drop 13%. If the government hadn't pulled the funding we would now know whether this technology actually works.

Posted By: Megacyclesit was planned to remove the carbon pre-combustion

How come, when it's the carbon that's about to be combusted?

Posted By: DamonHDCCS from biomas burning which is then net carbon negative

That's easily done, by charring - leaves all the carbon unburnt in solid form, burns off only the hydrogen in the hydrocarbon - but that releases as useful energy only about one third of the total energy-by-burning potential of the biomass/fuel.

Seems to me that schemes to recapture carbon out of the CO2 product of burning carbon for energy, must require the re-input of that same energy in order to reverse the exothermic chemistry.
Unless solar energy can be used instead - e.g. by employing

Posted By: Megacyclesamines removing carbon post-combustion

which presumably were derived from plants that grew by capturing solar energy.