Remind them that no idea or suggestion is "silly." In fact the main energy losses with wind power comes from the energy used to make the turbines in the first place. Wind: Harnessing the wind as a source of energy started more than 7,000 years ago. Small wind systems can reduce your energy-costs by as much as 90 percent, but they do require careful planning. When the wind blows past a wind turbine, its blades capture the wind’s kinetic energy and rotate, turning it into mechanical energy. This rotation turns an internal shaft connected to a gearbox, which increases the speed of rotation by a factor of 100. However, if costs over the lifespan of energy projects are taken into account, wind and utility-scale solar can be the least expensive energy generating sources, according to asset management company Lazard. It offers much the same benefits that many other alternative fuel sources do in that it makes use of a renewable source and generates no waste. Brainstorming: Have students engage in open discussion to think of how wind could be used as an energy source. wind turbine: A machine that converts the moving energy of wind into mechanical and/or electrical energy. Making electricity directly circumvents this thermal loss. And since the wind is free, operational costs are nearly zero once a turbine is erected. Wind is actually a form of solar energy. Using coal, over 60% of the energy in the coal is lost as waste heat. This form of energy generation has become increasingly popular in recent years. Wind is a clean source of renewable energy that produces no air or water pollution. It's sustainable. Harnessing the wind is one of the cleanest, most sustainable ways to generate electricity. Overall, using wind to produce energy has fewer effects on the environment than many other energy sources. The nation's wind supply is abundant and inexhaustible. 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