It actually alludes to a significant problem.
Solar generation is realitely cheap, much more storage is needed. Storage (overnight and also for several days) is challenging - one reason being its more expensive. Then there is the new transmission lines needed.
it's much much more expensive, people like to repeat the line that solar is the cheapest form of energy while hand-waving away batteries and grid upgrades required. I did the napkin math a while back but a battery bank for 10's of thousands of homes for 48 hours costed as much (more?) than just building a nuclear power plant.