The thing I like about rooftop residential solar is that the substations and the feeder lines don't need to get upgraded. During the hot sunny part of the day,

The thing I like about rooftop residential solar is that the substations and the feeder lines don't need to get upgraded. During the hot sunny part of the day, the locally produced energy can go right into AC. When grid scale batteries drop in price, the substations can also store energy. Then the feeder lines only ever need to support the base load power draw. Solar is so cheap, that even in off grid installations, the battery bank can be a fraction of what it previously would have been sized for. Modern batteries can be charged much faster and workloads can be shifted to the sunny part of the day.