In front of the two Jülich solar towers, there are more than 2,000 adjustable mirrors (heliostats) on an area of around ten hectares. They catch the sunlight, bundle it and direct it to the two solar towers. The larger of the two towers is a functioning solar tower power plant, so it can actually produce electricity. The tower has a research level for changing experimental set-ups. Since 2020, the solar tower power plant has been supported by the somewhat smaller so-called multi-focus tower . There are three levels with special equipment for the installation of specific experiments.