[ul][li]Windmills
Not sure if they exist in-game (a search yielded no results). It could be found or built as a long term project by a group of survivors or maybe as a very long term project by the player. A player/group constructed windmill would be a lesser version of an existing one.
While wind is present it can be used to mill/grind anything, whether it’s organic (grains) or inorganic (stones into pebbles. I like my slingshot If the windmill is actually being used, the milling/grinding will produce a moderate amount of sound, else it just generates little noise while it is not being used or it is being used to create battery charges.
Charges batteries if retrofitted with an alternator and jumper cables.[/li]
[li]Wind Turbines
Not sure if they exist in-game (a search yielded no results). It could be found or built as a long term project by a group of survivors or maybe as a very long term project by the player. A player/group constructed wind turbine would be a lesser version of an existing one.
Used to charge batteries, but if technically feasible it would provide electricity to anything within a certain radius.
Existing wind turbines that are spinning would create a loud sound, less than a gunshot, but equal or more than the biggest running engine. This would attract zombies from afar, but existing wind turbines should not be damaged by anything less than: high explosives (a few sticks of dynamite at a minimum), hitting it with a medium or larger size vehicle (sedan but more likely anything from a van sized vehicle or higher), cannons (not sure if they exist in-game), rail gun (damage depends on the size of the object used), and pretty much anything that can effectively take down a reinforced building (stone wall).[/li][/ul]