So it's the capacity factor that makes it viable. Makes sense.

Theoretically you could also have a wind powered airplane drawn by kites if there is a large enough difference in wind speed between air layers. A bit nuts though :D Like the airplane is pulled forward or powered by different speed or direction crosswind above or below the plane. Or maybe something like a tandem plane. But it's brain melting enough to implement this kite control software.

But the ultimate question is always €/kWh and how much embodied energy and material. A simple kite tethered to some deep screw foundation in the earth (or tree stump) is like almost nothing compared to a wind turbine with heavy foundation and tower that needs to resist far greater forces and be transported. This kite power, once you have a simple open design and open source software for electronics is almost low tech. All you do is fly a big kite and draw out a tether from a geared winch to produce electricity. Anyone could build like a 50 kW plant in their backyard which provides energy in the winter and different times than solar. You only need an electric motor as a winch, a simple "glider" drone and something like SoC computer or even just microcontroller. And sensors and wireless connection. The software is rather complicated with takeoff and landing and a standby hover mode right above the winch, and coordination with multiple of these kites.

One issue is regulations with air traffic so you can't fly these kites too high.

We literally have unlimited power for almost free. Unfortunately we don't live in a sane world.

Wind is great, mostly using conventional wind turbines. But it is still good to experiment with new power generation options.

Whats best is always regional.

Overbuilt solar is going to win at, say, the edge of the gobi desert.

But its not going to necessarily be practical at high latitudes, or locations with tons of rain/cloud cover, or places where geothermal is easy. And long distance power transmission is very difficult.