Jakub K. Jurasz is an assistant professor at Wrocław University of Science and Technology, Poland. He is a former postdoctoral researcher at MDH University, Västerås, Sweden, as a member of the Future Energy Center Group coordinated by Prof. Jinuye Yan. His PhD thesis was dedicated to the optimal operation of solar–wind-pumped storage systems. Currently, he continues his research in the area of renewable energy sources, power system transformation, and water–food–energy nexus. Alexandre Beluco is a professor at Federal University of Rio Grande do Sul, Brazil. His doctoral thesis was dedicated to the study of energetic complementarity, and he was one of the pioneers in addressing this topic. His research work is focused on hybrid energy systems, and more recently on hybrid storage systems, looking for the effects of complementarity and also for solutions to local problems, among other topics.