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There is no way you can get free solar panels installed on your house and connected up for free so there is a cost.
A large amount of this cost is labour. Utility scale solar has cheaper labour costs. As prices of solar panels goes down, relative cost of labour goes up.
I don’t see how rooftop solar will be cheaper than grid scale solar per mwh
I mean grid as in utility built grid solar. Everyone uses the grid so everyone needs to pay for it. But mass development of solar in a field is always going to be cheaper way of building solar than niche solar panel installation on a roof.