The electricity grid has been pieced together for more than 100 years. You don’t get a full upgrade every few years or even every several years like you do with most products. “The grid” (which is actually multiple grids) includes power plants that are decades old, brand new power plants, wires and substations of various ages, etc. This patchwork nature of the grid sometimes makes it fragile and faulty. Also, relying heavily on large thermal power plants ramping up when there is increasing electricity use, there can be significant challenges or even brownouts and blackouts if there are surges in sudden electricity demand.
