Energy systems are undergoing permanent and profound changes. A powerful driving force behind these changes is the need to halt climate change that occurs as a result of greenhouse gas emissions. The problem can be solved by replacing traditional power plants using fossil fuel with renewable energy sources (RES). However, to stop climate change, it is necessary not only to eliminate the emissions of electricity generation, but also to solve a more complex problem - to eliminate emissions in other infrastructures, particularly in transport. This article is devoted to the consideration of scenarios for the development of the energy systems of the Baltic countries. Significant capacities of RES (10 GW) and 2 millions of electric cars are expected to be commissioned until 2050 year. The issue of the region's ability to self-sufficiency, export/import of energy and to reduce emissions into the atmosphere is being investigated. The analysis is completed on the basis of modeling the behavior of the power system of Baltic States taking into account the connections with Sweden, Finland and Poland.