I talked with a mechanical engineer who worked on these things. He says they require a lot more maintenance than most people realize. Tremendous torque is generated by the blades, which puts a lot of strain on the gear box and connector parts.
He also said that once government subsidies run out the owners pretty much stop maintaining them.
Decaying wind farms are going to be the top public safety issue of the 2020’s.
Note to self: Move somewhere with no wind.
About 15 years ago, I drove from LAX to Palm Springs, through the whatever the valley is where all the wind farms are as you approach Palm Springs. It was obvious then that there was a lack of maintenance, as many of the windmills were not turning.