Introduction: Overview ; World energy and climate change ; Wind energy ; Design options ; Wind farms ; Economics ; Integration and variability: key issues ; Future developments -- Power system fundamentals: Introduction ; Basic principles ; AC power supply ; Introduction to power systems ; Power transmission -- Wind power technology: Introduction ; Historical review of wind power technology ; Design choices for large wind turbine generators ; Energy extraction and power regulation ; Fixed-speed wind turbines ; Variable-speed wind turbines -- Network integration of wind power: Introduction ; Wind farm starting ; Network voltage management ; Thermal/active power management ; Network power quality management ; Transient system performance ; Fault level issues ; Information ; Protection -- Operation of power systems: Introduction ; Load-frequency control ; System operation with wind power ; Energy storage/flexible load management -- Wind power forecasting: Introduction ; Meteorological background ; Numerical weather prediction ; Persistence forecasting ; Advanced wind power forecasting systems ; Conclusions -- Wind power and electricity markets: Introduction ; The electrical energy market ; Balancing, capacity, and ancillary services ; Support mechanisms ; Costs ; Investment and risk ; The future -- Appendix: FACTS technology.