They also use lots of irrigation from aquifers in the Great Plains, so they’ll need less irrigation and the shading will help a tiny bit with replenishing the aquifer.
In northern Europe these solar fields make no sense at all to me though. When I see something like the fields below in my temperate marine climate, then I can’t help but think of the forest that could have been there.
The picture in the op doesn’t look like agrivoltaics though. Compared to the agrivoltaics examples of the wiki article, the panels in the op are more densely placed, placed flatter, and placed closer to the ground. Nothing is getting harvested there, the most they could do is keep rabbits under them. From what I’ve seen in person, the non agri kind with panels over monoculture grass fields is much more common than agrivoltaics with cultivated fields.
Making wild forests in a temperate climate is not complicated at all. Stamp a bunch of seeds into the ground, fence it off to keep grazers away, wait a few years, and boom there’s a new forest. Once it gets started, nature knows just fine how to grow forests, they’ve been around far longer than our meddling after all. The problem is humans, who need capital and incentives to let nature do it’s thing. Making the forest is cheap, buying the land is expensive. And a wild forest has little earning potential, so for private landholders it makes no financial sense.
But if there were incentives, then these solar panels could have been put above existing hardened surfaces (roads, parkings), and the unhardened land could have been returned to nature. We’d have both the solar panel fields and the forest. It requires a much larger up front investment, which is why it’s not going to happen without government incentives, and to get those, political will is needed, which is why it’s not going to happen anytime soon.
And we should absolutely be making more forests from scratch, Europe has a massive deforestation problem. Reforestation is already an official policy goal in the EU and in most (I assume) EU countries, and this could be one of the ways of achieving those goals.