Windmills first appeared in Europe during the middle ages. The first historical records for their use in England date to the 11th or 12th centuries and there are reports of German crusaders taking their windmill-making skills to Syria around 1190. By the 14th century, Dutch windmills were in use to drain areas of the Rhine delta.

The first electricity generating wind turbine, was a battery charging machine installed in July 1887 by Scottish academic, James Blyth to light his holiday home in Marykirk, Scotland. Some months later American inventor Charles F Brush built the first automatically operated wind turbine for electricity production in Cleveland, Ohio. Although Blyth's turbine was considered uneconomical in the United Kingdom[8] electricity generation by wind turbines was more cost effective in countries with widely scattered populations. In Denmark by 1900, there were about 2500 windmills for mechanical loads such as pumps and mills, producing an estimated combined peak power of about 30 MW.

The largest machines were on 24-metre (79 ft) towers with four-bladed 23-metre (75 ft) diameter rotors. By 1908 there were 72 wind-driven electric generators operating in the US from 5 kW to 25 kW. Around the time of World War I, American windmill makers were producing 100,000 farm windmills each year, mostly for water-pumping. By the 1930s, windmills for electricity were common on farms, mostly in the United States where distribution systems had not yet been installed. In this period, high-tensile steel was cheap, and windmills were placed atop prefabricated open steel lattice towers.

Horizontal-axis wind turbines (HAWT) have the main rotor shaft and electrical generator at the top of a tower, and must be pointed into the wind. Small turbines are pointed by a simple wind vane, while large turbines generally use a wind sensor coupled with a servo motor. Most have a gearbox, which turns the slow rotation of the blades into a quicker rotation that is more suitable to drive an electrical generator.

Since a tower produces turbulence behind it, the turbine is usually positioned upwind of its supporting tower. Turbine blades are made stiff to prevent the blades from being pushed into the tower by high winds. Additionally, the blades are placed a considerable distance in front of the tower and are sometimes tilted forward into the wind a small amount.
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Wind farms are typically connected to local grid networks. Smaller wind turbines are used to provide electricity to isolated locations and for residential use. Small domestic wind turbines encourage utility companies to buy back surplus electricity.

Wind energy is attractive because of its renewable qualities.

It is extremely plentiful, is widely distributed and very clean. One downside is the cost of constructing wind turbine farms. As with many other forms of power generation, the farms are not universally welcomed due to their visual impact.

Turbine wind power is non-dispatchable, which means that the available output of solar power must be taken and used when it is available since it is not possible to store the energy produced by wind power. Other sources, including hydropower, must be used to match supply with the demand. Wind power is considered to be intermittent, which causes problems when wind power is low in supply. When wind is used for a moderate fraction of demand, additional costs for the intermittency are low.

Wind power began to be used approximately 5,500 years to sail ships and produce wind-driven natural ventilation. The first practical windmills were built in the 1st century AD. While contemporary windmills have a horizontal axis, early windmills had a vertical axis. The first horizontal axis windmills were not developed until around 1180. Windmills and the "water-pumping windmill" allowed for the expansion of farming, ranching, and eventually the rail transport systems around the world.

Wind varies, which means that averages per location do not indicate the exact amount of energy a wind turbine could produce there. To decide how much wind occurs at a location, it is necessary to use the Weibull model, which closely mirrors the actual distribution of hourly winds at many locations. The Rayleigh Distribution system can be used as well, but is also considered to be much less accurate.

The maximum amount of power is generated by high wind speed, and much of the energy comes in short wind bursts. In fact, large amounts of wind energy can be collected in a mere 15% of operating time.

Wind energy is renewable, and while it may be intermittent, this rarely occurs and any problems can be balanced with other forms of energy. Wind energy does not deplete fossil fuels, continues to be clean, and produces no greenhouse emissions.

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Peter Paul and Mary, Blowing in the Wind Lyrics: How many roads must a man walk down Before they call him a man? How many seas must a white dove sail Before she sleeps in the sand? How many times must the cannon balls fly Before they're forever banned? The answer, my friend, is blowin' in the wind The answer is blowin' in the wind. How many years must a mountain exist Before it is washed to the sea? How many years can some people exist Before they're allowed to be free? How many times can a man turn his head And pretend that he just doesn't see? The answer, my friend, is blowin' in the wind The answer is blowin' in the wind. How many times must a man look up Before he can see the sky? How many ears must one man have Before he can hear people cry? How many deaths will it take till he knows That too many people have died? The answer, my friend, is blowin' in the wind The answer is blowin' in the wind. The answer is blowin' in the wind.

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The said solar inverter matches its output to the mains power in the house. As a safety feature it will not produce any output if detects no main power from the grid. This prevents the Solar Inverter reverse feeding your house or the grid during a power cut or if a circuit breaker trips.

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Helical (twisted) Vertical Axis ( VAWT ) 6kW Wind Turbine. This particular turbine costs a ridiculous AUD500 installed and would take 75 years to pay for itself, but I'm sure it could be built ALOT cheaper by any skilled fabricator.