Like many countries in the world, I'm sure Poland would like to maintain some level of independance, especially energy independence. I say, good for Poland! They're developing thier own clean energy programs and re-using what the dutch probably wanted to throw out!

Nice video...

Yes. Why moving them ...

Let's put all the wind turbines of the world in their factory's backyard, then we can just move the power on the wires ...

Ehi wait ... Wind is not strong everywhere, and maybe there was a limited space in that spot to add additional turbines, while Poland had a windy place to utilize them...

"If you're wondering why they're being moved, then that makes two of us. Surely it would make more sense to leave them where they are?"

This actually warrants a long essay but in a few lines it comes down to the following: need for mid-life refitting of the turbines, upscaling of a really good location, investment costs difference between new and second hand for the Polish owners / location.
As for the Dutch location: these six machines are owned by a collective of various individuals (farmers, villagers) in the area. In the long run they simply earn more money from a 1.3mw machine than from a 0.6mw one. The overall costs of moving the machines is outweighed by their positive contribution (money as well as environment) by far.

I can think of 2 reasons for moving the old turbines: the Netherlands is small and quite densely populated (392 people per km2, USA 31) for a start, making 'repowering' much easier than sourcing additional land. Second, andlooked at from the Poles' point of view, is the crunch in the supply of turbines: easier to buy secondhand/refurbished, and transport the kit across the width of Germany (about 400 miles, on famously good roads) than source new. Look at it as a type of recycling!

And on top of that, for renewables site diversity is always a good thing (the EU is working towards a common Grid for that reason).

Why move turbines? For a very simple reason: it's cheaper to move a turbine that it is to erect the mast that will support it and the infrastructure needed to redistribute the electricity produced.

Even in the Netherlands, I can imagine there are places that are better suited to wind power production than others. If you already have erected the masts, and built the infrastructure, it makes sense to replace the turbine from time to time.

As far as Poland is concerned, well, I suppose the same economics apply: it's probably cheaper for them to buy a smaller 600KW, second-hand wind turbine than it is to buy a brand new 1.3MW one. Especially if this is a pilot project, needed to test the whole concept.