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Increasing spatial resolution of a sector-coupled long-term energy system model: The case of the German states

Author

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  • Brandes, Julian
  • Jürgens, Patrick
  • Kaiser, Markus
  • Kost, Christoph
  • Henning, Hans-Martin

Abstract

A current challenge in energy system modelling is integrating high temporal and spatial resolution with a detailed representation of technologies and sector coupling within a single model. This paper presents a pioneering sectoral optimisation approach for transformation pathways in the German federal states. Spatial resolution in the energy system model REMod is increased and the model is extended from a single-node to a multi-node model for Germany by integrating energy exchanges between regions into a simulation-based optimisation. The approach highlights the challenge of adjusting energy distribution to address the mismatch between high final energy demand in some states and the potential for renewable energy resources in others. The extended model was compared with the results of the single-node model with the same boundary conditions. The comparison showed that increasing the spatial resolution did not significantly affect the overall cost of energy system transformation. However, the composition of the energy system changes, leading to approximately 6% more renewable capacity being installed in a scenario with ten regions. The results for the German federal states indicate a concentration of onshore wind development in the northern federal states with higher full load hours, especially in Lower Saxony/Bremen with 36GW and Schleswig-Holstein/Hamburg/Mecklenburg-Vorpommern with 38GW in 2045. The expansion of photovoltaic capacity in densely populated states such as North Rhine-Westphalia (73GW), Bavaria (71GW), and Baden-Württemberg (54GW) reflects the need to meet growing electricity demand. The solar photovoltaic to wind power ratio varies between the federal states and influences the choice of flexibility options, including power-to-x technologies or gas and hydrogen turbines. By 2045, Germany’s primary energy supply will shift to states with abundant renewable resources. Spatial flexibility is essential to balance electricity demand and solar and wind potential, mainly through state interconnections.

Suggested Citation

  • Brandes, Julian & Jürgens, Patrick & Kaiser, Markus & Kost, Christoph & Henning, Hans-Martin, 2024. "Increasing spatial resolution of a sector-coupled long-term energy system model: The case of the German states," Applied Energy, Elsevier, vol. 372(C).
    • Handle: RePEc:eee:appene:v:372:y:2024:i:c:s0306261924011929
    DOI: 10.1016/j.apenergy.2024.123809
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