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with the ERP on what constituted 'best practice', as well as inputs on the equivalent targets being considered for the London 2012 Sustainability Plan and Marks & Spencer’s Plan A, among others.


Energy


Buildings were required to be at least 10 per cent more energy efficient than Building Regulations Part L 2006, with a further 15 per cent carbon improvement to be secured by requiring each building to be connected to Stratford City's on-site energy centre. By comparison, the London 2012 target, established shortly thereafter, was 15 per cent but did not include an incremental target for energy supply. The use of district Combined Cooling Heat and Power (CCHP) is a key achievement of the project and enables significant energy reduction. The entire Stratford City development is served by its own energy centre, located on the east side of the Olympic Park. All tenants – John Lewis and Marks & Spencer, the cinema and casino, and the hotels – are connected to the CCHP system. The Stratford Energy Centre also includes a biofuel boiler, which has the potential to supply a minimum of 2 per cent of energy demand through renewable sources.


Water Westfield Stratford City aims to cut non-potable water consumption by 20 per cent. This is met by the use of water-efficient fittings throughout the complex,


as well as a rainwater harvesting system which is predicted to supply approximately 55 per cent of non-potable water demand. As a point of comparison, the London 2012 target is 40 per cent water reduction, but this is met largely by the innovative technology at the Old Ford Water Recycling Plant, which cleans water from the adjacent Northern Outfall sewer.


Monitoring During its initial year of operation, Westfield Stratford City will be refining its building services and systems so they work as efficiently as possible. A second step will be to introduce further energy- efficiency initiatives directed against the largest areas of consumption, as well as setting up a tenants and user education programme. Still under discussion is the precise use of a £1.12 million fund set aside for renewables. Initiatives ranging from behavioural studies to the introduction of innovative technologies that harness energy from kinetic energy are under discussion. A major lesson from the Westfield Stratford retail sustainability journey is that sustainability makes business sense. Sustainability is accessible to everyone, and it’s commercially astute. 'We want to be the best leisure and retail destination and that means providing spaces people want to be in and that are inherently efficient to operate,' says Vicky Ward, Westfield's Sustainable Design Manager. Westfield sets a retail benchmark from which many can learn.


SIMON COCHRANE Westfield


We were frequently challenged by both the Design Review Panel and the Environmental Review Panel on the future flexibility of our buildings, and their ability to provide a structure and/or envelope for uses other than retail or car parking. We were able to demonstrate that our multi-deck parking structures and major leisure buildings could be transformed into hotels or offices through relatively straightforward refurbishment, given that the base structure and plan dimensions suited both typologies. Through these early investigations we made some major modifications to the base built to facilitate more efficient change of use at a later date.


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