Examples of renewable energy include solar, wind, geothermal, biomass and hydro. Solar energy comes from the sun. It is used to heat homes and water in more than 200,000 houses in the United States today. PV cells make electricity without moving, making noise, or polluting. We most often see these in calculators and watches.
Wind is used to generate electricity.
The windmills built long ago had many blades, but today's wind turbines usually have just two or three blades that turn when the wind blows. They have wind farms where large groups of wind turbines are connected to electric utility power lines and provide electricity to many people. Biomass energy comes from plants and trees. Wood is the largest source of biomass energy. We also use corn, sugarcane wastes, and other farming byproducts to produce biomass energy.