This book is a research monograph which deals with applications of different metaheuristic optimization methods to power system problems. The book is intended primarily for the researchers who are dealing with various aspects of power system optimization. The aim of the book is to explain the basic principles of metaheuristic optimization methods and their applications in power engineering. The first part of the book gives a brief description of selected metaheuristic optimization methods, whereas the second part covers the specific application of the metaheuristic optimization methods to solve various optimization problems in power systems. Each chapter contains a comprehensive review of recent literature