Wind can be an awesome force of nature, just ask anyone who has been in a tornado or powerful hurricane. We can harness this wind for the use of generating electricity for our world. When the sun shines it heats the earth, but since the earth is made of different materials and is of differing heights and valleys it heats unevenly, especially over land and water.

During the daylight hours is when the air over the land heats up more rapidly, and the air over the water heats up at a slower rate. The warm air above the land swells and rises, and the cooler air quickly spills in to fill the gaps, this process creates the wind. When night comes, the winds turn course, because the air cools more rapidly over the land than it does over water.

Today as we look for new ways to power the earth, it is a natural thing to look at wind power. It has been used for many years to power simple machines of the past. Wind is another type of solar energy, which makes it a renewable energy source. In years past we used windmills, the wind machines of today are called turbines.

Just like the windmills, turbines also use blades to capture the wind and turn it into energy. If there is no wind, then the turbines will not turn, this means that you must have a back up source of energy. Turbines are more sophisticated than windmills and they can use even the slightest breeze to turn the blades.

There are two types of turbines used today they are based on the direction of the rotating shaft for example; horizontal axis wind machines, and vertical axis wind machines. Sizes of wind machines can vary widely. There are smaller turbines used to power a home or small business, and they may have a capacity of less than 100 kilowatts. Larger commercial sized turbines may have a capacity of 5 million watts, or even as high as 5 megawatts. The large turbines are often found in wind farms that provide power to an electrical grid.

Most turbines used today are the horizontal axis type. The horizontal axis turbines have blades that are made like airplane propellers. A horizontal wind machine will typically stand about as tall as a 20-story building and has three blades that can span as much as 200 feet across. The largest turbines in the world actually have blades that are longer than a football field. Wind Turbines are built to stand tall and wide to capture more wind effectively.

Critics of electric wind power point out that the windmills which are essential to power generation are extremely large and make a lot of noise. Ordinarily, they can only be used in rural areas, where the open spaces and elevated terrain essential for their use can be found. Because of these limitations, they are not usually practical for more densely populated areas.

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