Airloom, a set of masts tracing a big oval with wires running between them on which wings fly around the oval generating electricity.

The solar one was perovskite solar panels, if memory serves, with zero indication that they've solved the delamination problem or why they matter in the face of dirt cheap basic solar panels. When good enough solar panels are the price of popcorn, how exactly do you sell an expensive one that's just a bit more efficient?