How Mirrors Could Solve our Energy Problem

In spain, Andalusie is also such a powerplant on the sun. It uses a molton salt heat collector heating up at daytime and producing electricity with steam turbines....Just a kind of salt filled Thermoscan. And at night it still produces energy, cooling down the thermoscan during the process....But never lower temperature than the meltpoint of the salt. Only one thing is necessary....a very sunny climate....In that spot in spain the sun is shinging about 362 days a year. Mirrors rotate on their axes....always keeping the reflection directed at that tower.  For me this is nothing new. In the USA they should build those around dead valley (take care of getting back the water after use in the steam turbines and do not spill the released warmth from condensing that water.)