This document discusses wind turbines and wind farms. It begins by explaining what wind is and the basic types of wind turbines, including horizontal axis and vertical axis turbines. It then discusses the major components of modern horizontal axis wind turbines. The document provides information on the top 10 wind power companies worldwide and lists the largest wind power plants, including the Alta Wind Energy Center in California, USA. It also discusses advantages and disadvantages of wind energy, as well as potential wind energy sites in the Philippines, including the Bangui Wind Farm in Ilocos Norte.