Is there a reason they space them so far ? Surely they could be placed more efficiently, or am I being dumb ?,(reply>), @Deep Sohelia  Now, I am by no means an expert so don't take my word for it. A wind turbine absorbs energy from the wind and turns it into rotational energy via the blades, so the air behind the blades will have less energy as part of it has already been absorbed. That and the blades affect the airflow behind them and make it more turbulent, reducing efficiency if there were to be another turbine behind it. And all this is ignoring safety if one turbine fails for whatever reason.,(reply>), they're spaced so the effect of 1 turbine on the wind doesnt affect another. something to do with a "wake"? not really well informed but that might point you in the right direction