The technological nature of human existence depends on the energy that has become a condition for the existence of every civilization and the driving force of every action. This confirms the modern dependence of humanity on energy, which determines economic growth and standard of living. It can also be a source of international conflicts. One of the main problems is the limited nature of its sources, especially non-renewable ones. Today, energy is a key factor in the development of the World and countries, characterized by different effectiveness of its use. Therefore, the main objective of the article was to assess the energy intensity of EU and world economies. World leaders in this field and countries with the highest energy consumption per unit of GDP were presented. The structure of energy sources in EU countries was also analyzed. It was found that 4 countries with the highest energy consumption account for 51% of global consumption, which indicates a very high level of concentration.