Well, consider that the conditions are quite a bit different. With conventional power, you have a small number of sources (plants) and relatively slow, predicta

Well, consider that the conditions are quite a bit different. With conventional power, you have a small number of sources (plants) and relatively slow, predictable swings in demand. Things like temperature changes throughout the day, or the end of rush hour and resulting spike in entertainment electronics usage. Contrast this with solar, with a large number of much smaller sources, and on top of the large predictable swings in demand, you add rapid, unpredictable swings in supply to the mix. That is a very different problem. It's solvable, just not using the same techniques and equipment that worked before.