ABSTRACT
Wind turbines have been used and have been evolving in various forms for the last 7000 years of human civilization. Versions of wind turbine-generated mechanical power helped early Egyptians propel boats along the Nile River as early as 5000 BC. Wind turbines only generate electricity when the wind is blowing. Wind energy is economical. According to research, it only takes three to six months to recoup the energy that goes into producing, operating, and recycling a wind turbine, which can have a 20–25-year lifetime. Unlike conventional gearboxes, wind turbine gearboxes are more difficult as far as regular maintenance and oil changes are concerned. Wind turbines are often located in remote wind farms and are difficult to access. Modern wind turbine lubricants require higher cleanliness for improved bearing and gear life. Modern wind turbines are sophisticated, capital intensive, and are designed for specific conditions to avoid over-engineering.
