Maybe someone who works with turbines can clear this up for me, but are these some cheap or old turbines? I have nether heard a turbine that loud in my life.

I found the value of 105 db at the source for a modern turbine, which would mean at a distance of about 700m the noise would be negligible. Possibly Greece doesn't have high enough standards for turbines and this is the result of a lowest-bidder kind of scenario?