here's a quality concept for you
It's a scalable, stackable, light in the air, controllable automated AWE Airborne Wind Energy Beasty.
And the idea is proving popular.
By spinning a bunch of kites from disks on tethers and a tracking rail generator ... you get power
The generation side is on the ground.
The drawing is a bit out of date now as the concept has developed... eh a few mins ago... but it's still a good indicator