The sun is the main energy source on earth, and it also promises independence, so the focus on its use in recent years seems logical. The results are impressive – the production of “own and green” energy is fashionable among ecologically responsible companies and households – we have a solution. Unfortunately, things are not so simple and this is best seen in Europe, where these technologies already occupy a large share, which allows us to observe effects that are not so obvious in the rest of the world.