The textbook "Power Quality" from Springer provides a comprehensive analysis of the challenges and developments in the field of electrical power quality. At a time when the demand for continuous and reliable energy sources is steadily increasing, the book highlights the necessity of improving energy efficiency and considering the impact of climate change and international agreements. It addresses the growing importance of information and communication technologies (ICT), which are supported by the increasing prevalence of electronic devices. These devices not only require a higher energy supply but also improved energy quality and reliability to meet the demands of modern society. The book discusses the challenges associated with miniaturization in microelectronics and the increasing processing speed, offering valuable insights into the future development of energy supply and usage.