Beyond energy efficiency in evaluating sustainable development in planning and the built environment

Abstract

The EU has set the policy target of reducing energy use by 20% by the year 2020. Therefore, a substantial consumption decrease is needed in built environment sector. Despite the great energy efficiency improvements in households, recent energy consumption data analyses show that these targets will unlikely be reached. The general aim of this study is to point out the need to define new indicators and evaluation approaches in urban planning and the built environment which are based on the concept of "energy subsidiarity", focusing on local renewable resources rather than on current approaches based on energy efficiency. This concept correlates energy consumption with the energy supply from local renewable resources and is here proposed as new urban planning evaluation approach toward sustainable built environment. In the paper, the "Jevons Paradox" concept and the "energy rebound effect" phenomenon are used to demonstrate how current approaches based on energy efficiency, alone, cannot lead to a remarkable reduction of energy consumption. This is also supported by data on European energy consumption and European energy efficiency in the built environment. Finally, a number of wellknown European ecological districts ("eco-districts") are analyzed in term of sustainable energy strategy as well as energy efficiency and energy balance. This study shows that there is a contradiction between the purpose of some of the eco-districts to be low consumption (or low impacts), and the district renewable energy balance. Only few of the analyzed eco-districts are able to cover energy needs by using renewable energy obtained in the surrounding area. In most of the cases, the focus of the districts' activities is on energy efficiency. According to the "Jevons Paradox" and "energy rebound effect" paradigm, energy efficiency alone will unlikely lead to an effective reduction in resources' consumption. These results point out the need to a radical shift toward the development of new approaches in the assessment and management of the built environment for sustainability.

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