Could they be using Satellite dishes mounted on every house in North America?
The key point is that the dish is usually a passive parabolic reflector. It doesn't produce energy; it concentrates or directs electromagnetic energy.
A 15-year-old satellite dish can be repurposed as a reflector/concentrator of Microwave/Rf Transmission. In principle, a suitable source placed at/near the focal point could be reflected into a directional beam, though ordinary satellite dishes aren't designed for visible light. What do they use the most? Invisible light.
Could they have turned thousands of abandoned satellite dishes on houses into some sort of distributed energy infrastructure?
Let me know what you think.