As part of the work of the Enquete Commission “Climate Protection Strategy for the State of Bremen”, various measures for achieving climate neutrality were examined and evaluated. According to the current state of discussion of the Enquete Commission, the target year 2040 is recommended for the state of Bremen. For public buildings, climate neutrality by 2035 is already being discussed, but the current framework conditions and measures are not sufficient to achieve the target. In particular, increasing the renovation rate and renovation depth to the lowest energy level currently seems unlikely, which is why the conversion to a climate-neutral energy supply is gaining in importance. The current study “Ways to achieve a climate-neutral building stock” by IREES and Fraunhofer ISE on behalf of the BBSR also shows that the most significant difference in the transformation of the building sector from a trend development to a cost-optimal target path lies in the faster conversion of the heat supply to renewable energies. If this is achieved, only slightly higher renovation activity is required.

Within the project, a strategy for the most effective way to achieve climate neutrality of the public buildings of the Free Hanseatic City of Bremen is to be developed, taking into account both energy refurbishment and conversion to renewable heat supply. The aim of the project is to develop a scenario for the economic and sustainable achievement of climate neutrality of public buildings by 2040. Should alternative time periods for achieving climate neutrality become relevant in the course of the investigations, further scenarios with variations are to be calculated.