This welcome new and revised edition of Electrical Power System Essentials is a valuable introduction to understand the role of the electrical power system in the world-wide energy transition process. It considers how renewable sources play a more dominant role in the generation of electrical energy affecting the control and operation of the grid. For bulk transmission of electricity at higher voltages DC is preferred instead of AC, and energy storage will play an important role at transmission and distribution level in the future electricity network. The basic operating principles of the grid, however, remain the same. Written in the accessible style that has made this book so popular with students and non-technical readers, the math content is restricted to the Appendix to maintain an easy reading experience of the main text, whilst providing the more advanced content separately.