en.Wedoany.com Reported - The new residential area project in Lübeck's St. Gertrud district, located approximately 2.5 kilometers east of the historic city center, is moving forward, planning to build modern housing for up to 1,000 residents. The Hanseatic City of Lübeck is promoting this project as one of its flagship residential developments, aiming to combine urgently needed housing with a sustainable energy supply concept.
The former Lauerhof allotment garden site is being transformed into an energy-efficient residential community, comprising multi-family apartment buildings, townhouses, and semi-detached houses, all equipped with sustainable heating systems. The Schlutuper Strasse/Lauerhofer Feld development covers approximately 11.5 hectares, offering around 53,700 square meters of balanced residential use, including 89 townhouses and semi-detached houses, as well as 14 multi-family residential buildings. The project also includes the construction of a parking facility of about 3,600 square meters, approximately 41,000 square meters of green and community spaces, and over 21,200 square meters of road infrastructure.
A notable feature of the project is its innovative energy concept, contributed by the Bauer Umwelt division of Bauer Resources GmbH on behalf of Stadtwerke Luebeck Innovation GmbH. The heating is based on a low-temperature district heating network, combining geothermal probes and decentralized heat pumps. Specifically, geothermal energy is extracted from the ground via geothermal probes, fed into the low-temperature district heating network, and distributed throughout the community. Over 130 geothermal probes are interconnected through a water-filled pipe network, ultimately providing thermal energy to the residential area. Decentralized heat pumps within the buildings then upgrade this energy to supply heating for individual residential units.
"On one hand, the low-temperature district heating network utilizes naturally available geothermal energy as its primary source," explained Marcel Moesslang, Senior Site Manager at Bauer Resources. "On the other hand, the system allows heat to be fed back into the ground during summer, enabling seasonal heat storage and contributing to building cooling." Overall, the planned system maximizes the utilization efficiency of renewable energy and achieves a highly sustainable, low-carbon energy supply for the community.
The first of three construction phases implemented by Bauer began in November 2024, with initial work focusing on drilling operations. Each geothermal probe, 170 meters deep, is the deepest ever drilled by the Bauer Umwelt division of Bauer Resources GmbH. A total of 135 geothermal probes were installed, with a cumulative drilling length of 23,552 meters. A Klemm KR 806-3GW drilling rig was used for casing-free drilling in fine sand layers. After the completion of the geothermal probes, earthworks and connection works began, including the installation of 11 distribution chambers. Two temperature monitoring stations will continuously track subsurface temperature changes across the entire area. During the final construction phase in autumn 2025, the geothermal probes were filled with a water-glycol mixture. Overall, on behalf of Stadtwerke Luebeck Innovation, the site team not only removed and disposed of 1,455 tons of drill cuttings and 700 tons of soil but also supplied and installed 750 tons of sand—figures that represent an exceptionally large-scale workload even for Bauer Resources professionals.
