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I think that what’s not in this article, but needs to be, is that rooftop solar in the rest of the world costs about 1/4 what it does in the US. Getting US prices down to where they are elsewhere would do wonders for closing this big gap.
It’s not just that; residential rooftop in the US is about 4x the cost of doing it in other countries, and would be cost-competitive with utility-scale if it was as cheap as it is elsewhere.