In Germany’s energy supply system, it is necessary to make increasing use of the possibility to combine the generation of electricity with the use of the heat which is generally produced at the same time (cogeneration of heat and power) in order to reduce primary energy consumption as stipulated in the Energy Concept. The high levels of electrical efficiency and the high CHP coefficients argue in favor of using fuel cells rather than other technologies. The fuel cell has been under development for many years in Germany, both for the distributed generation of power and heat and as a source of power for vehicles in mobile applications. In comparison with thermal processes, the fuel cell is characterized by a generally higher efficiency rating. One particular advantage is the fact that efficiency remains high both at partial load and in small units.