The energy sector in Serbia has the highest share in country's greenhouse gas emissions compared to other sectors that have harmful effects of global warming. Therefore, the energy planning should involve responsible behavior toward natural resources and environment. In order to define necessary measures for emissions reduction, different scenarios were developed, whose projections were made by varying the desired levels of emissions and priorities related to the energy efficiency (EE) and/or renewable energy sources (RES). The structure of primary and final energy consumption was also analyzed under the application of EE measures and measures to increase usage of RES.