In a method for increasing the
power output of a combined-cycle
power station, comprising at least one gas turbo group, at least one
heat recovery steam generator and at least one steam turbo group, with the gas turbo group comprising at least one compressor, at least one
combustion chamber and at least one gas
turbine, the
heat recovery steam generator having at least one pressure stage and the steam turbo group comprising at least one
steam turbine, in which combined-cycle
power station air is compressed in a compressor, is then supplied as
combustion air to a
combustion chamber, the hot gas which is produced there is passed to a gas
turbine, and the
exhaust gas from the gas
turbine is used in a
heat recovery steam generator to produce steam for a steam turbo group, an immediate and rapid increase in the
power output is achieved, and an additional
power output from the combined-cycle
power station is maintained in safe operating conditions, in that an supplemental firing is arranged to provide additional heating for the
exhaust gas from the gas turbine and in that the
combustion chamber or the gas turbo group is supplied with more fuel, and the supplemental firing is switched on at the same time, for immediately, rapidly and temporarily increasing the power output of the combined-cycle power
station, and in that the power output of the gas turbo group is reduced again to the extent that the additional
steam power produced as a result of the supplemental firing is also provided via the steam turbo group as power.