A geothermal energy system, having a carbon dioxide store at a first temperature and density, a retrieving device for retrieving carbon dioxide at a second temperature higher than the first temperature and a second density lower than the first density, a heat pump having a first heat exchanger, a compressor, a second heat exchanger, and an expander or a throttle. The first heat exchanger transmits thermal energy of the carbon dioxide to a process medium of the heat pump. The compressor compresses the process medium downstream of the first heat exchanger. The second heat exchanger transmits thermal energy of the compressed process medium to a consumer, and the expander or the throttle expands the process medium downstream of the second heat exchanger, and an introduction device introduces carbon dioxide downstream of the retrieving device and upstream of the heat pump into the system.