In a first step we will explain what is energy. The second chapter will, then, deal with the important question of the relation between Economy and Energy. For doing so, we will introduce a simple macroeconomics model where one of the variable of the model will be the price of Energy. After Economy, the political importance of Energy. So we will see the effect that it can have on people and on government. What is done for reaching source of energy and so on….. . After those general approach of energy we will more focus on what the EU has been doing, how it has been dealing with this issue? Finally we will try to provide some ideas and some policies orientation to the EU in order to face with this challenge. The methodology that we will use will be based on studies of original articles from the EU, the reading of articles and their analyses. The use of statistics and their interpretation and the modelling in the case of the macroeconomics model. The approach will also favour that the EU can work as federal state. We will based our Master thesis on those assumptions: Energy is a necessary factor of modern economy, so it has an economic and social impact for all economies in the world. Energy is a source of freedom and of development Energy is a political tool Energy as a way for deepening European integration Nuclear energy as the only credible, viable way for reducing the energy dependency of the EU. For the macroeconomic model we based our modelling on neoclassical assumption Literature: