Wind turbines convert the kinetic energy of wind into mechanical or electrical energy. Modern wind turbines are much more efficient than older designs, able to generate 250-300 kilowatts compared to older models generating around 30 kilowatts. Wind turbines work by using wind to turn blades which spin a shaft connected to a generator, producing electricity. They are mounted on towers to access stronger winds higher off the ground. While wind energy has advantages like being renewable and producing no emissions, it also has disadvantages like dependence on wind conditions and higher initial costs than some other energy sources.