Wind power plants are a clean and initially cheap. However, it's not recommended to power a huge city as in large numbers, wind has the higest total cost per megawatt. It's better for smaller towns and farming communities.
Wind is a clean and cheap option. It comes with three modules. There's the small horizontal turbine which is cheapest, but doesn't produce a lot of power. There's also the large horizontal turbine which produces a little more power. There is the vertical turbine which produces the most power. To get it, the player must build a school of engineering in a university and research it.