Yes. But why 12 m/s? Many sites dont get this windspeed very often. Could you not increase the output of a HAWT at lower windspeeds eg. by increasing the wing area (add blades)?
That way you would make less power more of the time. But it could be profitable.
What factors are limiting the minimum windspeed for a HAWT? Of course I am implying that I believe the calculation may be completely different for AWE, in a way that may be an advantage to AWE.
If the limiting factor for HAWT is the swept area it may not make sense to make a bigger blade without also increasing the power output. So the swept area is the limiting factor rather than anything else. For AWE, swept area is not limited in the same way, our utilization of the available wind is much lower. If the limiting factor is that you’d rather make more money at a lower capacity factor, then there is no difference between AWE and HAWT.
More info here: Power Density Function