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Commentary on the Paper "Embodied and Operational Energy Consumption in the City" by Troy, Holloway, Pullen and Bunker, Urban Policy and Research, 21(1), March 2003

The study by Troy, Holloway, Pullen and Bunker (2003) explores the use of existing data to estimate at the small-area scale the aggregate transport, building and infrastructure energy consumption attributable to urban development. It adopts an approach that was foreshadowed by Pullen and Perkins in 1995, and applied in Perkins (2002) to a detailed data-set of individual households. There is an extensive and much debated literature about the influence of the spatial structure of cities on transport energy consumption; but, to my knowledge, studies that extend the system boundary to include transport, buildings and infrastructure, and analyse both operational and embodied energy/ emissions have so far been limited to those cited here. This exploration of the full impact of energy and emissions from transport and the built environment is a valuable step towards establishing key performance indicators of sustainability.