The land can still be used by farmers to grow crops around the machines once they are they installed. Windmill power plants have certainly risen as one of the most important resource of energy. For remote applications, farms, energy conservation non-conventional schemes. Instead they are owned by and operated by business people who sell the electricity produced on the wind farm to the electric utilities.28 trillion KWh of electrical energy per year which is equivalent to about 200 GW or half of the annual output of all fossil fueled generating plants were powered by the wind. Today wind energy is one of America's greatest natural resource. Windmills helped the Holland to become the world's most industrialized countries by the 17th century.5 million tones. Centuries later, the Holland people improved the windmill. A wind turbine the vital part of power generation converts the kinetic energy of the winds motion into mechanical energy transmitted by the shaft. A wind power plant takes up hundreds of acres. Just plunking of wind machines doesn't stop from your expenses there are still maintenance costs to be considered. Later people built windmills to grind grain.S has enough stable wind to generate 1.How the wind is generated? The unequal heating of land and water by sun is the main cause of wind generation on the earth's surface. One wind machine needs upto two acres of land.. They must consider wind availability (amount of wind blowing), local weather conditions, nearest to electrical transmission lines and local zoning codes. A wind farm usually ahs hundreds of wind machines in all shapes and sizes. It has been America's greatest natural resources. 2) Stand alone (isolated) wind electric energy system with need for energy storage facility. Theses private companies are known as Independent Power Producers. Windmills are generally categorized into two types as: 1) Horizontal axis type and 2) Vertical axis type Further depending on their axis of rotation they are sub classified as: 1) Horizontal axis type windmills are further classified as: a) Single bladed b) Double bladed c) Multi bladed d) Bicycle multi bladed type e )Sail type f) Wing type 2) Vertical axis type windmills are further classified as: a) Savonius type machines b) Darius type machines Wind electric energy systems are classified into the following categories of utilization: 1) Wind electric energy systems connected to grid without need for energy storage facility. It is further converted into electric energy with the help of generator, thus producing electricity. As per study of NASA U. American colonists used windmills to grind wheat and corn, to pump water and to cut wood at sawmills. The global installed capacity of wind farm is 6000MW and about 10. Then in the early 1970's, oil shortage created and environment eager for alternative energy sources, paving the way for there-entry of the electric windmill on the American landscape. History of wind machines The importance of wind power was recognized quite in early period. Operating wind power plants is not as simple as plunking down machines on a grassy field. They thought of propeller shape blades and made it so it could be turned to face the wind. Wind energy is one of the forms of energy made available by the nature and is available at free of cost. Also depending on the rules of that particular state or area taxes may be imposed on the plant owners for the use of natural resource. The Manual butt fusion welding machines earliest known windmills looked like large paddle wheels. In the century, people use windmills to generate electricity in rural areas in the 1930's; the electric windmills were used less and less. Unlike nuclear or coal plants most wind plants are not owned by public utility companies. Over 5000 years ago, the ancient Egyptians used wind power to sail their ships over the Nile River. Classification of windmill As explained earlier windmill is machine for wind energy conversion.6 billion units of electricity were generated in 1996, thus reducing CO2 emission by 10. 4) Wind electric hybrid or wind electric, solar electric, battery hybrid. Wind plants need lots of land. 3) Non-critical wind electric or wind mechanical energy system, without need for energy storage. Wind power plants: Wind power plants or wind farms as they are popularly called are clusters of wind machines used to produce electricity. Wind plant owners must carefully plan where to locate their machines
