Solar balloons on giant energy farms

I had referred before to "blimp" driven wind energy. Well here's an example of solar balloons that offer some impressive figures in way of costings and energy production: CoolEarth Solar

Our Phase II system
will cost (us)
– 18¢/W for materials
– 29¢/W installed in large solar farm
􀂃 Compare with >$5/W for
conventional solar installations