TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The water vapor content of the raw gas after the direct cooling is adjusted to 40-60 vol.%. The used cooling water is preheated to 100-300 degrees C depending on the pressure for increasing the water vapor content of the raw gas. The combined carbon monoxide conversion and methanation is carried out in one or more stages. Only a partial raw gas stream is subjected to the combined carbon monoxide conversion and methanation. The combined carbon monoxide conversion and methanation stage is operated at temperatures up to 650 degrees C. The combined carbon monoxide conversion and methanation stage is supported by a sulfur- and water-vapor resistant catalyst. The reaction heat of the combined carbon monoxide conversion and methanation is used for steam generation, preferably to generate an arbitrary combination of high, medium and low pressure steam. The partial stream not subjected to the combination of carbon monoxide conversion and methanation stage passed through a parallely arranged carbon oxide sulfide/hydrogen cyanide hydrolysis step. The raw gas after passed through the combined carbon monoxide conversion and methanation stage is subjected to a carbon dioxide and/or hydrogen sulfide removal after the cooling. A gas after passing through the combined carbon monoxide conversion and methanation stage and the carbon dioxide and/or hydrogen sulfide removal step, is supplied to a combined gas- and steam turbine process for producing electron energy. The gas condensate resulting during the cooling of the raw gas leaving the combined carbon monoxide conversion and methanation stage is collected at 100-300 degrees C and is used for cooling and washing of the hot gasification raw gas of 1750 degrees C.The carbon dioxide and hydrogen sulfide are discharged as separate streams from the plant for carbon dioxide and/or hydrogen sulfide removal. The separated carbon dioxide is supplied to a landfill, where at least a portion of the separated carbon dioxide is recycled as carrier gas into the gasification process. A portion of the separated carbon dioxide is supplied together with the pure gas of a gas turbine. A portion of the cooled raw gas is supplied to the raw gas stream before the combined carbon monoxide conversion and methanation stage. EXAMPLE - Coal was first gasified in an entrained flow gasifier with oxygen at a temperature of 1450 degrees C and a pressure of 4.2 Mpa, and was cooled subsequently by injecting water in a quench cooler at 210 degrees C. Then at the indicated temperature of 210 degrees C gas was saturated by evaporation of most of the water supplied to the crude, hence the water vapor content increased to 53.1 vol.%. This raw gas, while maintaining the mentioned temperature for dust removal was washed with hot water and preheated to 280 degrees C, then subjected to the combined carbon monoxide conversion and methanation stage, at vaporizing temperatures of 500-600 degrees C and at a pressure of 40 bar to obtain methane.