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Power system benefits of simultaneous domestic transport and heating demand flexibility in Great Britain’s energy transition

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  • Franken, Lukas
  • Hackett, Andy
  • Lizana, Jesus
  • Riepin, Iegor
  • Jenkinson, Ryan
  • Lyden, Andrew
  • Yu, Lucy
  • Friedrich, Daniel

Abstract

The increasing share of variable renewables in power generation leads to a shortage of affordable and carbon neutral options for grid balancing. This research assesses the potential of demand flexibility in Great Britain to fill this gap using a novel linear optimisation model PyPSA-FES, designed to simulate optimistic and pessimistic transition pathways in National Grid ESO Future Energy Scenarios. PyPSA-FES models the future power system in Great Britain at high spatiotemporal resolution and integrates demand flexibility from both smart charging electric vehicles and thermal storage-coupled heat pumps. The model then optimises the trade-off between reinforcing the grid to align charging and heating profiles with renewable generation versus expanding dispatchable generation capacity. The results show that from 2030, under optimistic transition assumptions, domestic demand flexibility can enable an additional 20–30 TWh of renewable generation annually and reduce dispatchable generation and distribution network capacity by approximately 20 GW each, resulting in a total cost reduction of around £5bn yearly. However, our experiments suggest that half of the total system cost reduction is already achieved by only 25% of electric vehicles alone. Further, the findings indicate that once smart electric vehicle charging reaches this 25% penetration rate in households, minimal benefits are observed for implementing smart 12-hour thermal storages for heating flexibility at the national level. Additionally, smart heating benefits decrease by 90% across all metrics when only pre-heating (without thermal storages) is considered. Spatially, demand flexibility is often considered to alleviate the need for north–south transmission grid expansion. While neither confirmed nor opposed here, the results show a more nuanced dynamic where generation capacities are moved closer to demand centres, enhancing connectivity within UK sub-regions through around 1000 GWkm of additional transmission capacity.

Suggested Citation

  • Franken, Lukas & Hackett, Andy & Lizana, Jesus & Riepin, Iegor & Jenkinson, Ryan & Lyden, Andrew & Yu, Lucy & Friedrich, Daniel, 2025. "Power system benefits of simultaneous domestic transport and heating demand flexibility in Great Britain’s energy transition," Applied Energy, Elsevier, vol. 377(PB).
    • Handle: RePEc:eee:appene:v:377:y:2025:i:pb:s0306261924019056
    DOI: 10.1016/j.apenergy.2024.124522
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    References listed on IDEAS

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