NOVELTY - The procedure for the reduction of the carbon dioxide-emission from fossil-fueled power plants, comprises synthesizing liquid hydrocarbons as fuel from hydrogen and carbon dioxide contained in the flue gas of the power plant, and electrolytically extracting the hydrogen by using a part of the energy generated by the power plant or by a source from the power plant. A short-term retrievable reserve of the electric energy produced by the power plant is used in the framework of the primary control of the net frequency for extracting hydrogen.    USE - Procedure for the reduction of the CO2-emission from fossil-fueled power plants (claimed).    ADVANTAGE - The procedure ensures economical and safe reduction of carbon dioxide-emission from fossil-fueled power plants without requiring additional energy.    DETAILED DESCRIPTION - The procedure for the reduction of the carbon dioxide-emission from fossil-fueled power plants, comprises synthesizing liquid hydrocarbons as fuel from hydrogen and carbon dioxide contained in the flue gas of the power plant, and electrolytically extracting the hydrogen by using a part of the energy generated by the power plant or by a source from the power plant. A short-term retrievable reserve of the electric energy produced by the power plant is used in the framework of the primary control of the net frequency for extracting hydrogen. A stream from the flue gas of the power plant is branched-off with a carbon dioxide-quantity, which stands in a suitable stoichiometric ratio for available hydrogen gas quantity. The flue gas is subjected before the synthesis of gas wash. A required heat from the power plant internal heat source is decoupled to the flue gas for the synthesis. A released heat of a power plant-internal heat depression is fed during the synthesis for the preliminary heating of the combustion air for boiler (1). Oxygen is additionally available at the synthesis also in the flue gas. Methane containing gases like marsh gas, biogas or sewer gas are used for the synthesis of the hydrocarbons. An INDEPENDENT CLAIM is included for a fossil-fueled power plant.    DESCRIPTION OF DRAWING(S) - The diagram shows a power plant.    Boiler (1)    Pipe (5)    Turbine (6)    Generator (7)    Electrolysis mechanism (8)    Filtering device. (11)