Electrical Power System Essentials by Pieter Schavemaker offers an accessible, broad, and up-to-date overview of alternating current (AC) power systems. This revised edition is designed for both undergraduate students and readers without a technical background in power engineering. The book delves into the generation of electric energy from traditional thermal power plants to renewable sources, incorporating power electronic devices and FACTS technologies. End-of-chapter exercises are included in every chapter to aid understanding. Examples and case studies support theoretical concepts or techniques discussed. Mathematical modeling and equations are found in appendices, setting this text apart as a unique resource. The content addresses the question of whether the existing grid can be transformed into an intelligent and flexible system that is future-proof, especially with increasing reliance on local neighborhoods for power generation.