Hello,
As I remember, wind turbine from K2 is unlocked from the very beginning of the game and is made of materials you got on hand almost right at the moment you crashed.
Previously recipe already contained steel plates and it was so until I realize that it literally locks the turbine under red science which is not aligned with K2 so I replaced it with stone bricks. I want to keep things as they were designed by K2 developers: turbine is a source of miserable current but available right from the beginning
Stone makes perfect sense because to make something stand on a ground experiencing dynamic loads such as wind currents you definitely need a solid heavy base which is stone. Iron plates are used as both blades and structural pipes. Gears transfer and amplify wind power while copper wire used to make coils so rotor can rotate over them.
But you're free to take this mod and do anything you want. Considering this is not my original work plus someone already took it without any obvious reason and didn't even bothered to change an icon or at least remove my records from the release notes, not talking about maintaining them