(373ak) Optimisation of Decarbonisation Pathways for Heat and Power Sectors in the UK
At the time of writing, the majority of research work examines the problem of heat decarbonisation through electrification by considering aggregate representations of the spatial and temporal scales while also the impact of operational and security constraints on the resulting energy infrastructure has been neglected [5-8]. Another impact that has received limited attention is the electricity transmission implications on the design of the resulting national multi-energy system.
In the present work, we propose a spatially explicit optimisation-based approach to study the trade-offs among the different decarbonisation pathways on a national scale. The model simultaneously optimises investment and operational decisions for the power and heat sectors. On the level of investments, capacity expansion and decommission of different technologies are considered with 5-year time steps up to 2050 while the operational level is examined through a unit commitment formulation on an hourly discretisation. Because of the spatial and temporal granularity, the problem is formulated as a large-scale mixed integer linear program which can lead to intractable computational times. To alleviate this issue, we employ data-driven clustering methods and decomposition techniques that preserve the quality of the solutions whilst reducing the computational effort. By considering the whole multi-energy system, economic and policy insights are drawn based on the trade-offs between: (i) flexile and low-carbon technologies, (ii) heat and power generation and storage and (iii) the efficient integration of intermittent renewable energy sources. Finally, results showcase how acknowledging differences in resource endowments at subnational level enables for synergetic decarbonisation of heat and power sectors.
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