1500 2000 2500 3000

Swept area (m2)

3500 4000

Figure 6.3 Rated Power versus Swept Area for Turbines in Production in 1997

have been designed for different annual mean wind speeds, the degree of scatter is not large, and a clear trend is apparent, with the line of best fit being close to a straight line passing through the origin. The mean specific power, defined as rated power divided by swept area, is 405 W/m2 for the 75 machines - close to the optimum value in Table 6.3 for an annual wind speed of 7.5 m/s.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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