One problem is that solar's peak is too early in the day to match peak demand in most of the US (including Texas). Texas's electricity usage typically peaks around 4-6pm in the summer, while photovoltaic output peaks around 12-2pm. There is some storage, but you would need a lot more to line those curves up. A cost-effective way to shift the solar peak to about 4 hours later would definitely help on a lot of days.
For the curious, you can browse the demand curves day-by-day here: https://www.eia.gov/realtime_grid/#/summary/demand?end=20190...