This study assesses the geothermal potential of the Berlin–Brandenburg region, with a particular focus on leveraging existing infrastructure, including legacy hydrocarbon wells and or deep drilling boreholes, for sustainable heat and baseload electricity supply. Two representative areas, Groß Schönebeck site and Lusatia region, serve as examples of a regional strategy that combines technical and economic feasibility with existing regulatory frameworks. Findings highlight the potential of repurposing wells including district heating with multi-layer of reservoir development schemes for low- and medium-enthalpy geothermal applications and seasonal Underground Thermal Energy Storage (UTES). Drawing on the Groß Schönebeck case study, the value of reusing existing wells can be maximized by identifying multiple formations with different geothermal application pathways. The technical aspects should focus on the economic viability of using existing infrastructure to extend the productive life of hydrocarbon, mineral, and water wells, as well as geothermal wells. This would allow for the optimum utilization of formations, depending on their technical and economic suitability in relation to the geothermal utilization technology. In the other hand, the Lusatia case study reveals a successful approach to evaluating UTES potential by identification of geothermal resources (temperature and reservoir locations) combined with an understanding of regional heating demand and existing district heating infrastructure. Critically, the regional energy transition plan leverages government support for geothermal project investment, beginning with exploratory activities like 2D seismic surveys. This study, encompassing a larger regional area, addresses the significant investment costs and exploration risks inherent in geothermal development. While technical assessments and demonstrable demand establish economic viability at the micro-scale, broader implementation of geothermal projects, particularly those utilizing existing infrastructure, requires a robust regulatory framework and supportive local policies. These elements are essential catalysts for attracting investment, streamlining permitting processes, and mitigating initial financial risks, ultimately enabling the widespread adoption of geothermal energy.

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