your link lists some ways that the power is being stored and ready for demand....such as this part of your link. it seems that chile, dubai, and australia are not saying it can't be done. they are ahead of the U.S. and getting it done now.
Until recently, concentrating solar power was expensive, but in 2017, the price dropped precipitously, as new plants under construction in Dubai, Australia, and Chile each set new records for the cheapest electricity price in the world. The Chilean plant is being constructed in the relentlessly sunny Atacama Desert, where it will soon bring 24/7 solar energy to Chile’s mining industry.