Which detail does the author use to support the main idea in this paragraph?

A wind turbine captures the wind's energy. Turbines and windmills have a similar shape. A turbine has three long blades. It stands 100 feet tall. If you're driving across a stretch of open country, you might see rows of them spinning in the wind. As the blades spin, they power a generator. A generator is a machine that makes electrical energy. The energy from the generator goes to nearby homes and businesses.

Question

Which detail does the author use to support the main idea in this paragraph?
 
A wind turbine captures the wind's energy. Turbines and windmills have a similar shape. A turbine has three long blades. It stands 100 feet tall. If you're driving across a stretch of open country, you might see rows of them spinning in the wind. As the blades spin, they power a generator. A generator is a machine that makes electrical energy. The energy from the generator goes to nearby homes and businesses.