Energy transition (i.e. the replacement of the fossil energy mix by a stable decarbonized, renewable energy mix) is a huge worldwide challenge. For the EU, that leads this process, energy transition is also a categorical imperative towards energy security. Consequently, the alignment of the public policies of the EU community on these crucial issues, with the introduction of CO2 emission rates and other strict environmental regulations, is now a reality. However, in the EU and elsewhere, there are persisting differences within and among nations and regions engaged in energy transition. A more ample and profound view of the process requires new models and a wide discussion based on technical aspects together with economic, cultural, historical and socioeconomic factors. In this moving scenario, that offers unprecedented opportunities, GEM-SILKWAY 2023 - EASTERN EUROPE Edition is ready to contribute to knowledge and dissemination.