In our daily life we heard the word “energy” in several context: “renewable energies”, “kinetic energy”, “energy saving”, … Has energy always the same meaning? Are we able to produce our own energy? Why is so important the energy? Answering this questions, the pupils should become aware of the importance of the energy in our World and about the need of reduce energy consumption. Watching and analysing the habits and routines of their daily lives with other students in Europe, they will see how much they consume and they will work out realistic positive alternatives for a sustainable life.