The article intends to give a short overview of the initial Polish-Swedish proposal in order to properly define its role for the EU and post-Soviet states. It then intends to evaluate the most recent developments of the Eastern Partnership (EaP), with a special focus on the energy security platform, which is definitely the most important element of the EaP together with flagship initiatives related to energy sector. The EaP envisages not only the security of supplies and transit of oil and gas coming from the region, but deals with questions of regulations (regional electricity markets, improved energy efficiency) and ways of using alternative sources for energy needs. Last but not least the article discusses the possible future development of relations between the EU and Republic of Moldova participating in the Eastern Partnership in the light of the accession negotiations.