Solar energy refers to the utilisation of the sun's radiant energy to generate electricity or heat. In contrast to fossil fuels, this energy source is available in virtually unlimited quantities and is emission-free. It is primarily utilised in two technological ways: photovoltaics (PV) for the direct generation of electricity using solar cells and solar thermal energy for the generation of useful heat for heating and hot water. The choice of technology depends on the specific requirements of the building and the available roof or open space on site.
With the strict climate protection requirements in 2026, solar energy has become a central pillar of climate-neutral self-sufficiency. Solar systems are typically used on detached houses and apartment blocks, commercial premises or as balcony power plants. They make a significant contribution to local value creation and independence from external energy suppliers. In 2026, modern systems will mostly be operated in combination with battery storage systems in order to optimise the time-of-day-dependent energy generation to suit individual consumption.