Renewable energy is natural energy which does not have a limited supply and can be used again and again. In recent years, these energies (mostly wind energy) have been one of the fastest growing additions to power networks in many countries. It is due to advance in technology and it''s green nature. But this increase in wind energy might lead to challenging situations concerning reactive power and voltage control issues in both transmission and distribution network. This book, therefore, explains the procedure in extracting the kinetic energy from wind energy via wind turbines and the ability to control these voltage and reactive power issues. With the ability to control voltage and reactive power in wind energy, wind farms will be an ideal source of green energy for 21st century. This book could be useful to professionals who are dealing with wind turbines and green energy technology and to those who are working for the future challenges in power networks.