Wind is free and will not run out so the cost is in building the wind turbine.
Wind power generation does not create greenhouse gases.
There are very few safety risks with wind turbines.
We can only use windmills in areas where there is a lot of wind. Sometimes there may be days where there is little wind.
We need a lot of turbines to make a lot of electricity.
Some people don't like the way wind turbines look, they think they spoil the countryside