You have to know that this project is a pilot project in a program to phase out nuclear (of which Belgium has about 5.6 GW installed, which accounts for 56% of its production) and replace it by wind and gas: at least that was the proposition back 5 years ago when socialists and green party which were in the gov. then voted for that law. I would have preferred seeing this kind of wind farm in addition to nuclear (which is existing) to reduce coal-fired plants... I have a hard time imagining they are going to multiply this with a factor of 56. I think they will end up replacing nuclear by a lot of gas and a few windmills.
I'm not against such kind of wind farm, on the contrary. My view is that each KW hour produced in the current situation is a KW hour less produced by coal. But given the situation, I find it stupid to use that to try to phase out partially nuclear, while one is rather well placed to use it to diminish coal consumption.
I have the serious impression that it is oversold and the "300 MW" label is part of that.