The aim of this thesis was to optimize the heat and electrical power production of the thermal waste treatment plant Spittelau. In the thermal waste treatment plant the municipal waste of the city of Vienna is treated thermally and the converted energy is used to produce steam. This steam is furthermore used to generate electrical power via a turbine and moreover is used to gain heat by means of heat exchangers. The first chapter gives a short overview about legal requirements in the power supply industry. The following chapters deal with the processes of the plant where as a special focus is laid on the water-steam-system because of the fact that power and heat is generated in those processes. The gained electrical power and heat are not only produced for internal use but also for public mains supply. For this reason this thesis even considers public electric power and heat markets. In the following chapter an energy- and heat balance of the entire water-steam-system is drawn and therefore gives a good overview of the specific flow patterns of materials. To optimize the power production (and therefore the heat production) the author developed an interface for a detailed input of the electrical-power-consumption-forecast for the plant. With this detailed power-consumption-forecast the plant should be able to make more precise statements about the power availability for the public mains supply and therefore increase its profitability.