In its energy concept the German government aims at a reduction of a minimum 80 % of greenhouse
gas emission from 1990 by 2050. This shall be achieved by three measures: i) switching main parts of the energy system from fossil to renewable energy, ii) reducing energy consumption by the increase of energy efficiency and iii) the deployment of carbon capture and storage for industries which produce CO2 or rely heavily on fossil fuels, e.g. cement, and steel production and the energy production sector [1]. Studies claim that in 2050 electricity can fully be provided by renewable energy units (REU) [2].