In autumn 2022, an energy-saving novelty went into operation at Prodega-Market in Dietikon-Zurich, Switzerland. The Energy-Transfer-System (ETS) was integrated into a transcritical CO2 refrigeration system just in time for the upcoming winter with a predicted power shortage. The Energy-Transfer-System converts high-temperature waste heat from the CO2 refrigeration system into cooling capacity by means of a rankine cycle and in turn supports the CO2 refrigeration system. Overall, an annual reduction in electricity consumption of approximately 8% is expected.