Interesting idea. It has a basis on real life, too, with the wake effect and air turbulence. What would you suggest be the minimum separation distance if you want maximum power? I'm thinking about double the height of a turbine... say, 6 tiles? Also, would the separation need to be in all directions, or could one still do strips of turbines?
I'm expecting the wind turbines and wind to get a substantial rework eventually.. right now, it's set and forget power with no worries beyond periodic maintenance. As someone else suggested, have strong/weak wind periods, perhaps even no wind, so batteries are still required for low wind times. There's also wind direction to take into account. If the wind direction varied, then we'd need to keep wind turbines spaced far apart in all directions. Probably take into account nearby buildings blocking the airflow, as well.