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<br />Clean Wind vs. Dirty Wind <br /> <br />An important factor in the overall wind score for each specific site is the conditions surrounding the <br />proposed site. Ideally, a WECS should be allowed thirty feet (30') higher than the next highest obstacle <br />(Heller and Stimmel 2008). Winds closest to these obstructions create turbulent or dirty air, which <br />reduces the output of electricity created by the WECS (USDE . <br /> <br /> <br />Obstruction of the Wind by a Building <br />or Tree 01 Height (H) <br /> <br />Source: US Department of Energy (2007) <br /> <br />Types of Wind Energy Conversion Systems <br /> <br /> <br />There are essentially four types of wind energy conversion systems including micro-scale, small-scale, <br />medium-scale, and large-scale (also known as utility-scale). The amount of kilowatts per hour (kWfh) is <br />what essentially determines the separation between the four types. Other factors include height, <br />location, and connection to a utility grid or other parcels. <br />