The Allocation Act of the German Emissions Trading System offers an interesting 'transfer rule' which is unique in European Emissions Trading System: A plant operator may transfer the allocated emission allowances of a decommissioned facility to a new installation, if this installation replaces the old facility. Former Federal Environmental Minister Jürgen Trittin stressed, that this rule provides a major incentive for the renewal of the German power plant fleet by the erection of highly efficient new facilities. These modernisation efforts could make a major contribution to climate protection efforts. It can thus be expected, that a similar rule will also be implemented in the recently discussed Allocation Act for the next allocation period 2008-2012. It is thus worth exploring the details for the application of this rule.