I wonder how much interference/potential damage these could cause. Last I checked microwaves can wreak havoc on electronics, even if it wouldn’t harm people. Not very helpful to transmit power if every wireless communication system had to turn off to avoid frying.

In any case it seems like a novel concept, but only really useful for situations that cannot be reliably hooked up to a terrestrial grid. Figure for the cost to get one system in the atmosphere, you could get a comparable unit on the ground several times over for the same price. Not a fan of even more potential space junk in orbit either.