The movement of the water molecules is what is generating the charge difference. In effect, this is using the wind - or just the movement of air, but not in a m

The movement of the water molecules is what is generating the charge difference. In effect, this is using the wind - or just the movement of air, but not in a mechanical way. It is just using the wind to generate static electricity - the same way you generate an electric potential by rubbing felt on a balloon. Movement -> electricity. Of course it is fairly weak, but it is continuous and simple. There has to be uses for it.