A method is described for controlling the CO2 content in the flue gas from thermal power plants, in the case of combustion of carbon or other carbon-containing fuel and an oxygen-containing gas, in which the combustion takes place in a combustion chamber (6) and the combustion gas is separated into a CO2 -rich flue gas and a flue gas with a low CO2 content, where the CO2 -rich flue gas may then be treated so as not to allow CO2 to escape to the environment, which is characterised in that compressed air and fuel is fed to the combustion chamber (6), in which combustion takes place at an elevated pressure, the flue gas from the combustion is cooled and passed through a pressurised contacting device (13) in which CO2 from the combustion is absorbed by an absorbent, the non-absorbed gas is led away as a gas stream with a low CO2 content, compressed air is added, it is heated and depressurised across a gas turbine (15) before being released into the environment, and the absorbent is regenerated and recycled or removed for disposal. In addition, a thermal power plant for realisation of the method is described.
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