Burkhardt, AlexanderAlexanderBurkhardtFrömel, MiriamMiriamFrömelDeac, GerdaGerdaDeacBillerbeck, AnnaAnnaBillerbeck2025-07-112025-07-112025https://publica.fraunhofer.de/handle/publica/48943610.1109/EEM64765.2025.11050343This paper investigates the impact of different selfdischarge rates on the dispatch of pit thermal energy storage (PTES) within the sector-coupled energy system model Enertile. We analyze how varying self-discharge rates of PTES influence district heating (DH) generation across different DH type networks with distinct renewable heat potentials. Our findings indicate that lower self-discharge rates facilitate increased integration of heat pumps, particularly in DH networks with high shares of these technologies. Additionally, low self-discharge rates lead to a more long-term pattern in storage dispatch. This relationship between self-discharge rates and dispatch behavior significantly affects the overall efficiency and operational strategy of PTES in DH systems. The results underscore the need to account for self-discharge dynamics in energy system modeling, as traditional efficiency metrics may not adequately represent real-world performance without context on dispatch conditions.enEnergy system modellingDistrict heatingThermal energy storageconference paper