A cogeneration facility for supplying buildings and facilities with thermal energy and electrical energy is located in a closed enclosure, which is permanently under negative pressure during operation, wherein the negative pressure in the enclosure is controlled by a partial exhaust-gas recirculation into an intake channel of an internal combustion engine and an additional external flow resister that is provided in the closed enclosure, and a frequency converter capable of backfeed is connected to the generator in an advantageous manner. Highly efficient heat recovery is achieved, wherein heat losses are substantially minimized and, in combination with the exhaust-gas recirculation and the frequency converter capable of backfeed, very high power modulation is achieved while the exhaust-gas pollutants such as CO, HC, and NOx are simultaneously minimized.