This is one of my experiments. These mirrors focus solar radiation here where the radiation creates high temperatures to generate steam.

Now I will show you 1 of these 4 mirrors, and you can see that this surface is concrete. The 2nd surface is a mirror, and you understand that my goal was to find the cheapest mirror to produce the cheapest solar energy which will win the competition with thermal and nuclear power plants. This my old video showed in detail how I made my concrete mirrors, and how I glued reflective films onto their surfaces.

Of course, I am not the inventor of concrete mirrors, and for example, these are concrete mirrors which were made for the German Space Agency. They tried to create a cheap alternative to solar power plants of this type, where a similar mirror focuses the solar radiation into such a receiver where solar energy is converted into thermal energy with a temperature of almost 400 ?C which are converted into steam to produce electricity. In addition, some of that thermal energy comes into similar heat storages to generate electricity at night, and it is their advantage over solar panels which only provide electricity when the sun is shining.