Overview This is the dataset associated with the ZellNetz2050 project. The dataset forms the basis for the Cellular Energy System Model (CESM), see [1] and [2]. An overview on the data is given in the document “02 ZellNetz2050 - Data in Brief”. Further details on the data creation and validation can be found in the documents “03a Report - Working Package 2 (German)” to “03c Report - Working Package 6 (German)”—i.e., the reports of working packages 2, 3, and 6 of the ZellNetz2050 project. The dataset reflects the extensive research and modeling efforts undertaken to develop a decarbonized energy system by 2050, based on the Dena lead study “Integrated Energy Transition” (2018), see [3]. Funding This work was supported by the German Federal Ministry for Economic Affairs and Climate Action (BMWK) within the framework of the joint project ”ZellNetz2050” (Grant No. 0350065A-I). Further reading and links [1] Open Source Code of the Cellular Energy System Model (CESM), https://doi.org/10.5281/zenodo.11396394 [2] Schinke-Nendza et al. (2024) Modeling of large decentral multi-energy systems – An application to flexible heat pumps in a decarbonized scenario, https://doi.org/10.36227/techrxiv.170861965.51606148/v1 [3] Dena (2018) Lead Study - Integrated Energy Transition, https://www.dena.de/projekte/projekte/projektarchiv/dena-leitstudie-integrierte-energiewende/.