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People seem to be missing something important about this suggestion:
In a market system where solar pv is an option, per-residence efficiency and effectiveness matters a lot and the objections raised here makes sense. But a mandate that all new builds come with solar pv changes that logic fundamentally.
You are now in the domain of grid-scale distributed energy production, grid resilience, and production scaling that will force panel prices much, much further down. This is an infrastructure change and should be considered in those terms.
I would personally have started with residential energy storage for the same reason, but honestly both should happen anyway.
Nah we’re speedrunning the 20s currently, so it’ll probably be another ten, fifteen years or so.