In the BEACH project, we propose tackling the challenges of the Swiss energy transition with demon-strating a new technology for storing and retrieving energy in the subsurface: Fractured Thermal Energy Storage (FTES). This could be a key component for providing baseload energy to compensate for sea-sonal phases of energy demand and surplus. To our knowledge, this is the first attempt of energy stor-age in crystalline rock, which is particularly interesting for Switzerland, because large parts of the Swiss subsurface include this rock type. We will test several scenarios on their suitability for energy storage, and we will demonstrate that this can be achieved in an efficient and safe manner with appropriate monitoring techniques. Here, we report on the first phase of the project. Using numerical modelling approaches, we show the feasibility and efficiency of FTES with a single hole scenario at the Bedretto Lab test site. We demon-strate that with realistic injection rates of 200 l/min of 60°C water, the efficiency can be > 70%. Based on these numerical results, we present an experimental setup that will be implemented in the next phase of the project at our test site in the Bedretto Lab. First trials are expected to start in early 2025. Furthermore, we provide three conceptual case studies, with which we show that our concept is appli-cable to a range of potential sites in Switzerland. With a comprehensive fracture analysis at the Valle-maggia site, we demonstrate the potential usefulness of this location for FTES purposes. Furthermore, show that the results obtained at the Bedretto Lab can be transferred to a site near Schaffhausen. Finally, we make use of a newly established industry collaboration in Northern Switzerland to prove the economic viability of FTES.