Within the project eXtremOS application-oriented emission balances for 30 European countries were created. Through the methodical combination of various statistical energy data and based on the application-oriented energy balances, national energy-related CO2 emissions can be presented in different levels of detail (sectors, applications, energy sources and branches). In addition, a distinction is possible between CO2 emissions from final energy consumption and CO2 emissions from energy source processing. For one thing, the balances enable energy-related analyses, e.g. the highlighting of country-specific characteristics or cross-country comparisons. For another, the statistical data can serve as model input for energy system modeling.