The concept of sustainable development and concern for future generations challenge us every day to the emergence of new technologies for energy production, and new patterns of use of these energies. The rapid emergence of new technologies can make understanding and therefore the perception of it difficult. This book aims to contribute to a better understanding of these new technologies of electricity generation by addressing a diverse audience. Indeed, it presents the issues, sources and means of conversion into electricity using a general approach and develops the notions of scientific basis to understand their main technical characteristics.