The goings-on inside wind turbines is a lot more complicated than you would imagine. The biggest risk is fire, as they generate heat as well as electricity.
Not mentioned is the role of ball-bearings. These wear out faster than intended, and constantly need replacing. There are none hard enough to cope with the stresses required. Heat and eventually fire is the inevitable result as they lose their smoothness.
This presentation interested me nonetheless. He talks of future designs to come being very different. He mentions fire several times. I wonder what a next gen design would have to eliminate the risk of fire. Ball-bearings will always be needed in a rotating blade design.