For more than 20 years, we have been using a powerful solar system to heat water in our company. For about 5 years we have been operating several photovoltaic systems to support the power supply in a CO2-neutral way. Through the complete thermal renovation of the building, the installation of highly insulated windows as well as the use of ultra-modern heating systems, heat pumps and heat recovery in all cooling and ventilation systems, our operation has been further modernized, optimized and brought up to the current state of the art. In addition, all light sources were converted to energy-saving LED technology.