Wind Turbines are modules that generate power randomly from the wind, and they are able to produce power at any time of day, provided that wind is blowing. Each planet also has different wind ratings, so certain planets are better to use wind turbines on than solar panels.
A smaller version of the Wind Turbine, the Small Wind Turbine is a widget, and a power source that can be placed on a Platform, Vehicle, or on the utility slots of an astroneer's Backpack. The Small Wind Turbine will only produce power while in windy weather. It must be researched first before being able to craft one