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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.
Part of the problem in the US is that residential solar installers have been allowed to run scams and provide no customer support. NPR did a great podcast on it: The Dark Side of Rooftop Solar