A domestic power plant , in particular for the self-sufficient energy provision of a residential building equipped with electricity and /or heat, comprising - a housing comprising an external air connection and an exhaust air connection , - a ventilation device comprising a heat exchanger , wherein the ventilation device is connected to the external air connection such that the outdoor air (AUL) can flow in a first air tract via the heat exchanger , or via an outdoor air bypass past the heat exchanger , into a supply air tract of the domestic power plant , wherein the supply air tract runs at least partially within the housing , - an extract air tract , in which an air volume flow brought about by the ventilation device can propagated within the housing , - a fuel cell unit , which is arranged within the housing and integrated into the extract air tract such that undesired gas released in the fuel cell unit can be diluted by the extract air volume flow and be removed together with waste heat from the fuel cell unit , - a storage battery unit which is preferably arranged within the housing and integrated into the extract air tract such that undesired gas released in the storage battery unit can be diluted by the air volume flow and be removed together with waste heat from the storage battery unit , - a second air tract which is connected to the extract air tract , wherein the second air tract of the ventilation device is thermally coupled to the first air tract via the heat exchanger of the ventilation device such that it is possible for extract air via the second air tract to give off, as required and via the heat exchanger of the ventilation device , at least part of the thermal energy contained therein to the first air tract , and simultaneously the undesired gases diluted by the air volume flow can be expelled together with the air volume flow via the exhaust air connection , so that the formation of explosive gas mixtures in the domestic power plant is avoided and the domestic power plant can be operated safely. - a housing comprising an external air connection and an exhaust air connection , - a ventilation device comprising a heat exchanger , wherein the ventilation device is connected to the external air connection such that the outdoor air (AUL) can flow in a first air tract via the heat exchanger , or via an outdoor air bypass past the heat exchanger , into a supply air tract of the domestic power plant , wherein the supply air tract runs at least partially within the housing , - an extract air tract , in which an air volume flow brought about by the ventilation device can propagated within the housing , - a fuel cell unit , which is arranged within the housing and integrated into the extract air tract such that undesired gas released in the fuel cell unit can be diluted by the extract air volume flow and be removed together with waste heat from the fuel cell unit , - a storage battery unit which is preferably arranged within the housing and integrated into the extract air tract such that undesired gas released in the storage battery unit can be diluted by the air volume flow and be removed together with waste heat from the storage battery unit , - a second air tract which is connected to the extract air tract , wherein the second air tract of the ventilation device is thermally coupled to the first air tract via the heat exchanger of the ventilation device such that it is possible for extract air via the second air tract to give off, as required and via the heat exchanger of the ventilation device , at least part of the thermal energy contained therein to the first air tract , and simultaneously the undesired gases diluted by the air volume flow can be expelled together with the air volume flow via the exhaust air connection , so that the formation of explosive gas mixtures in the domestic power plant is avoided and the domestic power plant can be operated safely. <EOS>