Under CopyrightHerbst, AndreaAndreaHerbstToro, FelipeFelipeToroReitze, FelixFelixReitzeJochem, EberhardEberhardJochem2022-03-0415.11.20122012https://publica.fraunhofer.de/handle/publica/22979110.24406/publica-fhg-229791The energy demand and supply projections of the Swiss government funded by the Swiss Federal Office of Energy and carried out by a consortium of institutes and consulting companies are based on two types of energy models: macroeconomic general equilibrium models and bottom-up models for each sector. While the macroeconomic models are used to deliver the economic, demographic and policy framework conditions as well as the macroeconomic impacts of particular scenarios, the bottom-up models simulate the technical developments in the final energy sectors and try to optimise electricity generation under the given boundary conditions of a particular scenario. This introductory article gives an overview of some of the energy models used in Switzerland and - more importantly - some insights into current advanced energy system modelling practice pointing to the characteristics of the two modelling types and their advantages and limitations.enenergy modellingbottom-upTop-Downhybrid energy system modellingSwitzerland303600journal article