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. This liquid fuel is very important for transportation because nearly one-third of our nation's energy is now used for transportation. Energy produced by biomass could someday supply much of the fuel for our cars, trucks, buses, airplanes, and trains. This is very important because nearly one-third of our nation's energy is now used for transportation. There are other sources of renewable energy including trash, water, and geothermal.