Who knows…
On the two documents below, we can better see the details. 12 turbines, 100 kW each. The diameter of the balloon is 40 m, so the diameter of each turbine could be about 6 m (by being optimistic, and rather about 4.5 m), leading to a swept area of about 28 m², leading to a power of 6.72 kW, assuming a power coefficient (Cp) of 0.4, and a nominal wind speed of 10 m/s. Even if the duct is very efficient, a power of 100 kW looks impossible. If the nominal wind speed is 20 m/s, 100 kW could be achieved if the duct doubles the turbine power. If the nominal wind speed is 17 m/s, 100 kW could be achieved if the duct triples the turbine power. In fact if the diameter of each wind turbine is only 4.5 m as supposed, the power could be far lesser.
