During recent years the distribution per sector of Luxembourg's energy consumption shifted noticeably in favor of the building sec- tor. In 1990, 71% of the total domestic end energy consumption was ascribed to the industrial sector and only 20% to the building sector. The distribution has changed significantly since then and in 2005 the industrial sector contributed only 44% to the national energy consumption while transport and the tertiary sector (incl. private and public households as well as non-residential buildings) accounted for 25% and 31% [3], respectively