We are looking at periods of time that energy will be nearly free. Energy has value, so if it is being offered for free the markets will take advantage of that.The problem with solar, in particular, is the combination of low capacity factor and highly variable output. The cost of the panels themselves is almost irrelevant here. The panels could damn near be free and solar would still end up more expensive to operate on the grid.
For instance, it could be used for desalination. No one cares if the water they drink, or use to grow crops was desalinated a day or two ago.
It is all going to take new thinking, but it is an opportunity of immense proportions. It is an opportunity that Republicans do not want Americans to have. Basically, Republicans want the USA to become a third world country over the next few decades.