I know somebody who is closer than I am regarding solar -- especially solar farms.
He said, for example, once the solar arrays aren't viable anymore, the electric company would come and take out the solar panels and nothing else. Any concrete, posts, etc. would stay. There are an increasing amount of farmers that are electing to install solar farms. I'm sure it will be a decade or so until this is proven to be true or not.
Here is a link to a 1,000 acre farm in Sheboygan county.
https://www.alliantenergy.com/our-energy/solar/wisconsin-solar/onion-river-solar-project