Introduce the basic concepts of power systems as well as the tools students need to apply these skills to real world situations with Power System Analysis and Design : SI Edition, 6E. This new edition highlights physical concepts while also giving necessary attention to mathematical techniques. The authors develop both theory and modeling from simple beginnings so students are prepared to readily extend these principles to new and complex situations. Software tools including PowerWorld Simulation, and the latest content throughout this edition aid students with design issues while reflecting the most recent trends in the field.