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.

Daytime is when the air above the land heats up more quickly, and it heats the air over water more slowly. Warm air that is above the land expands and rises, and cooler air quickly comes in to fill the gaps, and this creates wind. In the evening, the winds reverse, because air cools more quickly over land than over water. This is why you have the differing temperatures of land near bodies of water.

Today, we use wind energy mainly to generate electricity to run homes, businesses or communities. Wind is a safe, clean, renewable energy source, this is because as long as the sun will shine, the wind will blow, and this is a constant factor in our earth’s environment.

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.

The blades on turbines typically are about 200 feet across, but can be as wide as a football field. These blades are made much like an airplane propeller, and can be made of fiberglass, or a lightweight metal or plastic. The towers or bases have to be wide and tall in order to efficiently harness the wind. This is a great power source for the world of today.

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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