Long established as the standard reference for power system operating professionals, this definitive guide provides full coverage of the essential principles and methods of electric power system operation. This revised and expanded Third Edition fully explains how power systems work, providing detailed information on power production, transmission substations, and circuits and control systems for electric power facilities. Critical information is included on power system control ... protection and stability of power systems ... economic operation ... telemetering ... supervisory control ... data acquisition ... and extra high voltage systems. The Third Edition provides timely material on substation arrangements, new methods of power production, reliability factors, and system protection. End-of-chapter questions and summaries highlight key points - to further extend the guide's value in assuring safe, reliable, and economic operation of power systems and equipment in any facility.