Nobody subsidizes renovation.
After twenty years of being an obnoxious neighbor, there is no political will to renovate a wind turbine. Therefore there is no government subsidy.
Without subsidy, it doesn’t happen.
Unlike most everything else in the energy generation biz these things are built like disposable lighters. Take the rotor bearings for example; each rotor has a servo motor constantly adjusting the pitch. The rotor is mounted to a bearing that is about five foot in diameter, and a cheap sheet steel race holds the bearings in place while the whole thing is contained with grease seals.
With time and wear the bearings work past the race and it cuts the grease seal spewing grease over a large area. As I understand it these wind turbines are all foreign made and come with no manufacturer warranty of any kind.
Flying a small plane over the country opened our eyes to the miles and miles and miles of these ugly wind farms. We had no knowledge how much of the country is littered with these things and probably 60-70 percent are not spinning.