a method for regulating a short - term power increase of a steam turbine with an upstream waste - heat steam generator is provided . the steam turbine has a number of economizer , evaporator and super heater heating surfaces forming a flow path for a flow medium . the flow medium is tapped off from the flow path in a pressure stage and is injected into the flow path on the flow - medium side between two super heater heating surfaces of the respective pressure stage . amount of flow medium injected is regulated with a characteristic value which is a discrepancy between the outlet temperature of the final super heater heating surface and a predetermined temperature nominal value . the temperature nominal value is reduced and the characteristic value is temporarily increased more than in proportion to the discrepancy for a time period of the reduction for achieving a short - term power increase of the steam turbine .