A simplified framework to assess the feasibility of zero-energy at the neighbourhood/community scale

• An extension of the zero-energy objective to the neighbourhood scale is proposed.
• A “zero-energy neighbourhood” framework is developed and applied to two case studies.
• The zero-energy objective is difficult to reach in existing neighbourhoods.
• The potential of “energy mutualisation” at the neighbourhood scale is illustrated.
• Location and mobility should be included in existing works about ZEBs and ZECs.

Zero-energy buildings (ZEBs) are attracting increasing interest internationally in policies aiming at a more sustainably built environment, the scientific literature and practical applications. Although “zero energy” can be considered at different scales (e.g., community, city), the most common approach adopts only the perspective of the individual building. Moreover, the feasibility of this objective is not really addressed, especially as far as the retrofitting of the existing building stock is concerned. Therefore, this paper aims first to investigate the opportunity to extend the “zero-energy building” concept to the neighbourhood scale by taking into account two main challenges: (1) the impact of urban form on energy needs and the on-site production of renewable energy and (2) the impact of location on transportation energy consumption. It proposes a simplified framework and a calculation method that is then applied to two representative case studies (one urban neighbourhood and one rural neighbourhood) to investigate the feasibility of zero-energy in existing neighbourhoods. The main parameters that act upon the energy balance are identified. The potential of “energy mutualisation” at the neighbourhood scale is highlighted. This paper thereby shows the potentialities of an integrated approach linking transportation and building energy consumptions.