This book is the result of the author's guidance of numerous Ph.D., M.Tech. thesis, and B.Tech. projects in addition to years of teaching courses in Electrical Engineering to undergraduate and graduate students in the areas of Computer Methods in Power Systems, Digital Simulation of Power Systems, Power System Dynamics, and Advanced Protective Relaying at I.I.T. Kanpur. The book's material is also put to the test in a number of industrial and QIP-sponsored courses that the author coordinates. The chapter on Economic Load Scheduling of Power Systems in the current edition contains a subsection on the solution process to integrate transmission losses using dynamic programming. Additionally, a new chapter on load forecasting has been included to this edition. The present book deals with almost all the aspects of modern power system analysis such as network equations and its formulations, graph theory, symmetries inherent in power system components and its formulations, graph theory and development of transformation matrices based solely upon symmetries, feasibility analysis and modelling of multi-phase systems, power system modelling including detailed analysis of synchronous machines, induction machines and composite loads, sparsity techniques, economic operation of power systems including derivation of transmission loss equation from the fundamental, solution of algebraic and differential equations and power system studies such as load flow, fault analysis and transient stability studies of a large scale power system including modern and related topics such as advanced protective relaying, digital protection and load forecasting. The book contains solved examples in these areas and also flow diagrams which will help on one hand to understand the theory and on the other hand, it will help the simulation of large scale power systems on the digital computer. The book will be useful to both undergraduate and graduate students in Electrical Engineering as well as to the engineers working in electricity boards and utilities etc.