Because wind turbines have limiters to stop them rotating too quickly. If they didn't, they'd rip themselves to shreds whenever the wind was high. I imagine the friction caused by the limiter caught something flammable and the whole thing went up.
I still find it funny that a wind turbine's main function is to use wind to collect energy and that you want more wind to generate more power. But the more wind broke the actual thing. It's like the light intensity being so high that it melts the solar panel