This paper is devoted to tracing contemporary perceptions of energy security. Energy security, as a concept started its evolution from a point, where it was identified with secure oil provision for countries, which did not possess energetic resources and were increasingly dependent on oil imports. Gradually, the concept of energy security started to be repeatedly used in the scientific papers, popular press and media and even colloquial language. Energy security has become an argument in making political decisions. Nevertheless, despite the exaggerated attention to energy security, still there is no unanimous agreement on what the concept of energy security means, what facets it embraces and, consequently, how it could be measured and controlled. The paper aims to distinguish the main perceptions of energy security and foresee plausible implications of one or another approach adopted.