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(d) Wind Energy Conversion Systems Definitions <br /> HORIZONTAL AXIS WIND TURBINE. A wind turbine design in which the rotor <br /> shaft is parallel to the ground and the blades are perpendicular to the ground. <br /> HUB. The center of a wind generator rotor, which holds the blades in place and <br /> attaches to the shaft. <br /> HUB HEIGHT. The distance measured from natural grade to the center of the <br /> turbine hub. <br /> MONOPOLE TOWER. A tower constructed of tapered tubes that fit together <br /> symmetrically and are stacked one section on top of another and bolted to a concrete <br /> foundation without support cables. <br /> RESIDENTIAL WIND TURBINE. A wind turbine of 10 kilowatt (kW) nameplate <br /> generating capacity or less. <br /> SMALL WIND TURBINE. A wind turbine of 100 kW nameplate generating <br /> capacity or less. <br /> TOTAL HEIGHT. The highest point above natural grade reached by a rotor tip or <br /> any other part of a wind turbine. <br /> TOWER. A vertical structure that supports a wind turbine. <br /> UTILITY WIND TURBINE. A wind turbine of more than 100 kW nameplate <br /> generating capacity. <br /> VERTICAL AXIS WIND TURBINE. A type of wind turbine where the main rotor <br /> shaft runs vertically. <br /> WIND ENERGY CONVERSION SYSTEM (WECS). An electrical generating <br /> facility that consists of a wind turbine, feeder line(s), associated controls and may include <br /> a tower. <br /> WIND TURBINE. Any piece of electrical generating equipment that converts the <br /> kinetic energy of blowing wind into electrical energy through the use of airfoils or similar <br /> devices to capture the wind. <br /> Page 3 of 7 <br />