Depends on the salt used.
If you check here on table 5 you'll see that common table salt (NaCl) melts at 801º C.
As for what's used, in Chapter 2 of that paper they say "Molten salts consist of alkali metal or alkali metal halides and oxygen-containing salts", no it's not actually table salt for Generation 2 of those kind of power generators.
In all fairness, you need to install a magnet at the far end and keep constantly pluging and unplugging it to generate power...
Actually it does change, from what I read mainly in terms of what substance is used to capture the heat of the sunlight, which in turn has other implications downstream: for example, if you melt salt and the molten salt is used to generate steam (so a generation 2 system), rather than directly heating water with sunlight to generate the steam (generation 1), not only does the efficiency go up but you can keep on generating power during the night as long as there's enough heat left in the salt, and whilst the basic principle is the same a lot of the engineering of the system changes because you're circulating melted salt rather than steam, you want to store some of the heated salte for the nighttime and you need to concentrate more sunlight to reach higher temperatures so the area of mirrors is larger.
Here is a paper I found about this stuff.
I think that's what they called a First Generation generator.
The ones in use now will actually use sunlight to melt salt (than then is used to generate steam) rather than directly generating the steam which has way more capacity to store heat, so they have a solar conversion efficiency of between 38% and 44%, plus the molten salt can keep on being used to generate steam during the night until it cools down enough.
There are literally some kinds of solar panel to generate heated water for things like home use.
They're just boxes painted in black with a pipe with water also painted in black zigzagging inside of it, rather than being photovoltaic panels.
Were I live now - Portugal - something like that works fine even in Winter to generate hot water for things like showering.
That said even during the Summer something like that won't generate steam (or at least, not with enough steam pressure to drive a turbine), unlike what the meme shows, though there are solar power concentrators that use sunlight to melt salt which then boils water to generate steam for a steam turbine, but those use a ton of mirrors to concentrate sunlight into a central tower were the salt is being melted. (For example).
There is actually a Solar Power Generation system were a solar collector uses sunlight to melt salt which then circulates through pipes to a place were it heats up water to boiling and that steam then goes through a turbine thus generating electricity.
However to reach those temperatures a simple panel isn't enough so what you have is a ton of mirrors over a large area all focusing the sunlight on a central tower were the salt-melting happens.
Here is an example.
By the way, this stuff actually has benefits over solar such as the ability to generate power at night (basically you don't extract all the heat from the molten salt during the day and just keep using it to boil water to feed the steam turbine during the night), plus it's a bit more efficient than solar panels and like solar panels it's also improving, throught things like using different salts.
If it's not in your hands in an open format it's not yours.
You're still getting product placement on imported American TV series and Films, same as everybody else.
Not even cats are safe from cats.
Finally some worthy storage for memes!
Eat your heart out Ea-nāṣir.
Mate, I'm in Portugal and of all the countries and people who made statements about this attack, the only one the news TV station I was watching actually played was the one from the Israeli government.
These fucking assholes are very purposefully feeding the very "Israel and Jewish People are the same thing" that makes people thing that the sociopathic genocidal mass murdering of chidren done by Israel is a Jewish Thing, which in turn feed the real anti-semitism.
To support a modern day white colonialist ethno-Fascist project (and the local Fascists who support it) these people are activelly fostering an environment were innocents are killed because they're Jewish.
It's pretty much a required upgrade to be able to protect yourself from dropped or balistic nukes.