The demonstrator was built to demonstrate the feasibility of the process and the robustness of the SOFC. It consists of 2 submodules supplying each 27 kW gross power. The key feature of the process is the anode gas recirculation that allows us to handle the diesel within the adiabatic prereformer without any deep desulphurization technologies on the one hand side and to increase the overall fuel utilization on the other hand side. Furthermore, an additional anode off-gas blower is used to levelize the pressure between the anode and the cathode, which reduces the risk of oxidation of the anode in case of leakages. The demonstrator was started on commercial road diesel containing 11 ppm_wt sulphur, 6.2%_vol FAME and 24%_wt aromatics. An electrical gross efficiency of 55% and fuel utilization of 73% could be demonstrated already during the first hours of operation.