Technology

Why red? Paint it like a brick wall so they can pass through.

Hmm interesting. I don't see how it could be economical as an emergency-only power source. To build them and store them for occasional use seems pretty unappealing. Surely if you had them, you'd use them to generate electricity/passive income.

You could think of them as easily mobile power systems, available to respond to emergencies, but used wherever is convenient the rest of the time.

So yeah, they'll still be a hazard for air traffic, but luckily we do have an established solution for that, the blinking red light. Also, controlled airspace around airfields.