Manuel Pérez-Donsión has been Full Professor at the University of Vigo, Spain, since 1987. He is the President of the European Association for the Development of Renewable Energies, Environment and Power Quality, the European Association for the Development of Electrical Engineering, and the Spanish Association for the Development of Electrical Engineering. He was awarded the Gold Insignia of the "Green Week Foundation" and is the author of two research books and seven other books, as well as over 100 research papers. Gianpaolo Vitale has been a Senior Researcher of the National Research Council of Italy since 1994, and currently works at the Institute for High Performance Computing and Networking. His publications include two co-authored books, two edited volumes, four book chapters, and over 100 scientific articles. He is also a senior member of the Institute of Electrical and Electronics Engineers.