The climate change and the shortage of the fossil resources are energy-related topics that lead to discussions about the energy supply of the future: On a local and on a global level, in professional and in private contexts. Following the catastrophe in Fukushima the awareness for the necessity of discussing increased. In Germany, the reaction resulted in the so-called “Energiewende” – the energy transition. While English – as lingua franca – cannot solve the problems of energy supply, it can at least aid finding the right words when talking about finding a solution. Within the wide field of energy, this MOOC focuses on the topics closely related to energy transition. However, it will not give a deep insight into the technical terminology e.g. of a power plant.