摘要：Energy is in the centre of the economic development of each country, setting into motion and fuelling factories, government buildings and offices, schools and hospitals, heating homes and keeping perishable foods cold. Its importance explains its complexity. Energy is source of wealth and competition, base for the political controversies and technological investments, and also the core of the epochal challenges of our global environment. Energy is essential for a sustainable development. Security of supplyis a priority for many countries. In this context, there are more ways through it can be achieved: effective management of the demand, diversification of energy sources and the locations of supply, or even using military presence. Energy security can best be defined as the overlap between economic security, national security and the environmental security. This paper will present the economic component of the energy security concept, its purpose being to analyse the concept of energy security in the world.
关键词：Energy security; Energy policy; Economic sustainability
