Why do tower top side-to-side deflections have non-zero average?

Dear Emanuele,

No, that is not really correct.

The mechanical power convertible to electricity is torque*speed. Unless the speed is very high, the torque must be sizeable to generate useable power. This torque not only counteracts the aerodynamic torque, but it has an equal and opposite effect on the tower–inducing a side-to-side bending moment and side-to-side deflection.

I hope that helps.

Best regards,