How many power plants have been shut down due to windmill farms replacing them? Any? Or do they keep on running 24/7 because the wind isn't reliable?
Here's a graph showing how the US generates its electricity. The significant change is the drop in coal powered generation. That doesn't necessarily mean that a plant was shut down, though.
Electricity in the U.S. - U.S. Energy Information Administration (EIA)

As I wrote earlier, until we have a better way to store electricity renewables aren't going to be the entire solution. One of the reasons that natural gas is being used more is because gas fired turbines can be turned on at a moment's notice (unlike nuclear and coal), making them a good partner for renewables for the days when the wind doesn't blow and the sun doesn't shine.
What happens to every windmill farm after they are built? They fall apart. Maintaining them is extremely expensive. Wind means dust, and dust means abrasion. The blades themselves wear away from the dust at an extreme rate that requires replacement, or on site rebuilds, or what happens most of the time, they are abandoned.
All equipment needs maintenance to continue operating. The table that I included in my previous post included those maintenance costs when calculating the cost to produce electricity. Unlike a lot of people most folks on TBN have a pretty good idea about what is required to maintain equipment. Most of us would estimate that the maintenance required for a system where an electric generator is spun by a big propeller is going to be less than that required when the electrical generator is spun by a natural gas fired turbine or a steam powered turbine where the steam is produced in a coal fired or nuclear heated boiler.
Innovation only happens when there is free market. Windmills are paid for by federal funds regardless of how well they perform, or how much money they lose. This is why I am against windmills. If they actually did what they are supposed to do, I would be all for them.
There are lots of drivers for innovation. The cost of solar panels has dropped 99% over the last 40 years. Government subsidies around the world played a big role in that happening. One of the biggest drivers of innovation is war. It's amazing how the world's airforces changed from biplanes to jets during 1939-45.
Explaining the plummeting cost of solar power | MIT News