Though solar energy has received a lot of attention, it’s actually one of the least efficient renewable energy sources we currently use. The efficiency of solar energy is 207 percent, but wind energy is 1164 percent efficient, and geothermal energy and hydroelectricity fall between these two numbers. All of these renewable resources are part of our renewable energy future. By 2050, it is estimated that wind energy will make up 35 percent of the United States electricity production, since one large turbine can power about 1400 homes. READ MORE