A bit like the current mix of power supply:
- conventional electrical grid to homes and businesses in populated areas,
- high-voltage power lines into factories,
- gas-powered generators for homes in remote areas and for back-up purposes.
I have a 100 A line (on a 100 A breaker in the main panel) going into my garage where a sub panel has two 50 A breakers which each feed a NEMA 14-50 outlet.