Sustainable development is feasible through energy transition. The key elements of such transition are: the implementation of energy efficiency measures, the use of renewable resources, tackling climate change and environmental protection. It is known that the EU has established a legally binding framework for achieving the goals of the Paris Agreement from 2015, as well as ambitious goals through the 2030 Agenda. Since Serbia signed Sofia Declaration from 2020, it will create new Energy Strategy and technical study based upon existing energy sources, to get to the aim of optimal energy mix. This will take into account the electricity system and energy security, as well as the economic and financial analysis of the proposed technical solutions of the optimal mix. In this paper, a multi-criteria analysis has been developed for the purpose of evaluating the results and selecting the scenarios on the basis of which the draft of the Integrated National Energy and Climate Plan will be prepared. The basis for this analysis should be the selection of the optimal energy mix that will be continuously monitored with special reference to the period of energy crises, when there are major disruptions in prices and availability on the world energy market.