Preface.- Chapter1: Introduction.- Chapter2: Fundamentals of Reactive Power in AC Power Systems.- Chapter3: Reactive Power Role in AC Power Transmission Systems.- Chapter4: Reactive Power Compensation in Energy Transmission Systems With Sinusoidal and Nonsinusoidal Currents.- Chapter5: Reactive Power Importance in Wind Power Plants.- Chapte6: Reactive Power Control and Voltage Stability Problem.- Part 1: Fundamentals and Contemporary Issues of Reactive Power Control in AC Power Systems.- Chapter7: Reactive Power Control and Voltage Stability Problem.- Part 2: Chaper8: Reactive Power Compensation in AC Power Systems.- Chapter9: Modern Solution for Dynamic Reactive Power Compensation.- Chapter10: Optimal Placement of Reactive Power Compensators in AC Power Networks.- Chapter11: Reactive Power Optimization in AC Power Systems.- Chapter12: Implementing Reactive Power Optimization Using Digsilent and Matlab.- Chapter13: Multi-Objective Optimal Reactive Power Dispatch Considering Uncertainties in the Wind Integrated Power Systems.- Chapter14: Reactive Power Optimization Effects on Relays Coordination in AC Power Systems.- Chapter15: Communications for Electric Power Systems.- Chapter16: Scada Applications for the Electric Power System.- Chapter17: The Effect of Geomagnetic Storms on the Electricity Networks.- Chapter18: Electric Transmission Lines Environmental Impact Monitoring.