One Jack Rickard, RIP, who was quite an opinionated jerk imho, coined the concept of "selfish solar." The idea was that solar was on its way to becoming so cheap that one should just install enough panels and batteries such that you basically never use the grid, it's just a backup for uncommon events. Basically grid use drops to that 1 or 10% of the time the sun doesn't shine for days. I think we are there on the panel side, and will be there soon on the battery side. Selfish solar could make sense but it would change the economics of solar and electric grids substantially. If everyone went selfish solar, grid electricity and infrastructure would become prohibitively expensive. We are decades away from that or at least one decade (IMHO), but we need thoughtful regulation on this point. Will we get it? I suppose time will tell.