Efficiency of wind turbines increases with height above 'ground'. I expect for this purpose the top of the tree canopy would be the ground, so turbines would h

Efficiency of wind turbines increases with height above 'ground'. I expect for this purpose the top of the tree canopy would be the ground, so turbines would have to be higher by the amount of the forest canopy height, at least. I expect there are more issues with wind flow over tree canopy vs a crop field, but I suspect the height issue alone is enough to make the economics pretty bad.