Not every house has solar resource. If your house is in the middle of the woods it's not going to work unless you clear-cut the surrounding woods and then you're not in the middle of the woods anymore. Same if you are in the shadow of a couple of mid-rises. etc. etc. Even if there is solar resource it may not replace more than a fraction of usage. Roof-top solar is great where the resource exists, but it's a partial solution at best. There's still a need for the utility grid and something needs to fuel that. It could be utility-scale solar, but it's not onsite rooftop solar.