This isn't even about storage. This is just about having thick enough electric cables so that the grid doesn't overload. Right now the grid fails even if there are consumers for all that power. We're failing to transport the power.
Residential solar is very different to regular solar though. Grids weren't designed to aggregate lots of tiny feeds from people's houses, and it makes sense not to over-build that ahead of demand because in many cases the maths don't really work out except via subsidies, which can be here today, gone tomorrow.