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We use renewable energy strategies to improve our countrys energy efficiency Approximately 84 of the energy we use in the United States is wasted It cost us billions of dollars every year because of the energy that is wasted The renewable energy strategies we use today are solar heating wind energy biomass energy and geothermal energy These four strategies help us reduce the amount of energy that is wasted Solar energy is the process of using the suns energy as a source for heat and electricity The different forms of solar energy are passive heating active heating solar thermal system and photovoltaic cells Passive heating is absorbing and storing heat from the sun directly within a building without using mechanical and electrical devices Active heating is absorbing heat from the sun using mechanical devices such as pumps or fans to distribute heat energy Active heating is more expensive than passive heating A solar thermal system gathers solar radiation using a solar panel to heat air and water for commercial and industrial use It can also convert heat into electricity Photovoltaic cells can directly convert solar energy into electrical energy A photovoltaic cell is an electrical device that converts the energy of light into electricity by the photovoltaic effect which is a creation of an electric current caused by its exposure to sunlightMany European countries and Mid-Western areas of the United States use wind as their source of energy They generate electricity from the wind by using wind turbines that efficiently converts the kinetic energy of the wind directly in to electrical energy Some areas have wind farms which are clusters of wind turbines that generate electricity In order to take full advantage of wind energy an area has to have high wind speeds and plenty of space for wind farms North Dakota South Dakota and Texas use wind as their source of energy According to the US Department of Energy wind power has been the
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