I think the point that was trying to be made is that wide-spread deployment of residential solar isn't a panacea. You still need to provide sufficient grid cap

I think the point that was trying to be made is that wide-spread deployment of residential solar isn't a panacea. You still need to provide sufficient grid capacity to serve the customers when there is no sun. And you have to pay for that standby grid capacity whether you are using it or not. That isn't a problem when the residential solar is a tiny percentage of the customer base but it is a problem with wide-spread deployment. The same problem exists at the grid-level as you ramp up grid-scale wind/solar -- that doesn't mean you can decommission the other generating capacity and so total cost of the grid goes up, not down. https://www.americanexperiment.org/2018/11/renewables-cheap-germanys-electricity-expensive/ https://www.americanexperiment.org/2018/11/renewables-cheap-...