TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The three functional units are arranged in a row with respect to the flow direction of introduced air through the three functional units and/or along a common longitudinal axis. The process temperatures of the devices of the energy generation apparatus increase from the first functional unit via the third functional unit to the second functional unit. All devices of energy generation apparatus are arranged on a common supporting structure. The supporting structure in the region of the first functional unit comprises a first frame plate (10) on the side facing opposite to the second functional unit, a second frame plate between the first functional unit and the second functional unit and/or a third frame plate between the second and the third functional unit. The frame plates are made of metal and are connected by the supporting structure. A first fixing plate is arranged at the first functional unit on the side facing opposite to the second functional unit. A second fixing plate is arranged between the first and the second functional unit for fixing devices of the first and/or the second functional unit. A third fixed plate is arranged between the second and the third functional unit. The third fixing plate is designed as an adapter plate made of upper plate (14a) and lower plate. The devices of the second functional unit are thermally and/or fluid communicatively connected with the fuel cell. The first fixing plate, the second fixing plate and/or the third fixing plate with at least one flexible mounting tab are connected with the supporting structure. The fuel cell and/or at least a part of the adapter plate, preferably the lower plate is removable such that wear parts of the second functional unit, preferably a reformer catalyst are easily replaceable. The energy generation apparatus comprises insulation, and housing made of housing parts. The energy generation apparatus is made adiabatic through the insulation. The insulation has three insulation regions corresponding to the functional units. Each housing part covers three functional units. The housing parts are individually removable. At least one device for media supply, preferably blower or compressor, a valve and/or a hydrocarbon pump are arranged outside the housing and/or the insulation. The housing at least partially forms the supporting structure. The supporting structure is formed by a frame made of metal. The second functional unit for reforming is arranged between the first functional unit for media supply and the third functional unit for generating electrical energy.