After decades of stability, power systems are currently undergoing a rapid transition - demand patterns are evolving, while supply sources are shifting to renewable energies at an accelerated pace. This book, written by an experienced energy professional, combines the various aspects of supply and demand developments to offer a unified perspective. It highlights the key changes that the world of electric utilities and power systems will face in the coming decade, as well as the major challenges that will emerge as a result. Supplemented by a wealth of global and local data, the book describes the major patterns that affect both supply and demand, and provides a quantified analysis of their impacts on power system grids and markets. Lastly, it explores the new technologies that can enable the success of these transformations.