The world energy consumption will grow by 56% between 2010 and 2040. As world population continues to grow and the limited amount of fossil fuels begins to diminish, there is an increasing demand to exploit renewable sources of energy. In the United States, about 9% of all energy. consumed in 2012 was from renewable sources . While this is a relatively small fraction of the U.S. energy supply in 2012, the United States was the world's largest consumer of renewable energy from geothermal,solar, wood, wind, and waste for electric power generation producing g almost 25% of the world's total.