That’s the common thought, but it rests on the assumption that demand cannot be manipulated.
Legacy generation incentivized overnight consumption, when the grid had excess production capacity it needed to unload. With solar, we need to reverse those incentives. If it is harder to produce power overnight, we can drive large industry (like steel mills and aluminum smelters) to switch from overnight operations to daytime consumption.
Overnight storage is something we do need, but it is not efficient, and the need for it should be avoided wherever possible.
Parking garages are usually full during the day, when solar is at its highest generation. In the near future, as EV adoption rises, parking garages need charging stations at every space, sucking up every “excess” watt on the grid.
Negative prices are occurring more and more frequently. The cause is baseload generation: it can’t be dialed back as quickly as solar increases during the day, and it can’t be ramped up as fast as solar falls off in the evening. The baseload generators have to stay on line to meet overnight demand. Because they can’t be adjusted fast enough to match the demand curve, they have to stay online during the day as well.
The immediate solution is to back down the baseload generators, and rely more on peaker plants, which can match the curve.
The longer term solution is to remove the incentives that drive overnight consumption. Stop incentivizing “off peak” consumption, and instead push large industrial consumers to daytime operation.