There’s one type of solar power plant that I know of which the Israelis have, I think... it focuses the light onto a column of salt and it becomes molten.
It’s able to store the heat and use it to heat water for making steam and can function into the wee hours or under clouds.
Of course over here there would be protests if anyone wanted to mine salt for the things.
I think there are plans to build similar ones in Tunisia... on whose land I don’t know.
This one in Morocco sounds very similar if not the same, though it doesn’t specify what the fluid is.