Passive Houses consume less than 15 kWh/m2.year final energy for their heating requirements, compared to a typical use of 100-150 kWh/m2.year for standard homes, i.e. a reduction of minimum 85%. In Europe, about 6-7000 Passive Houses have been constructed so far, primarily in Austria, Belgium, Germany and Scandinavia. The concept is spreading to other countries such as e.g. Denmark, France and The Netherlands. Passive Houses strive as well for economy in their other energy uses, such as electricity and hot water production, targeting a 50% reduction, and setting a criteria for maximum 50 kWh/m2.year total final energy use.