Sustainability Report 2010
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Energy Efficiency at Stratford City

Case Study - United Kingdom

Energy Efficiency at Stratford City

In 2011 Westfield Stratford City opened at the site of the London 2012 Olympic Games. The development is a major urban regeneration project that, together with the establishment of Olympic Park, will revitalise East London. 

The development of Stratford City represents a major opportunity for the Group to implement a sustainable energy system that integrates with the surrounding infrastructure to meet the considerable demand for the supply of utilities — both during and after the Games — in the form of heating, cooling and electricity. 

An innovative and efficient heating and cooling system is being used to meet the needs of the centre and its retailers. 

The combined cooling and heating power (CCHP) plant is part of a broader electricity plant installation comprising two Community Energy Centres that supply Stratford City and Olympic Park with heating, cooling and electricity. Together with a number of other environmentally-friendly initiatives including the use of recycled materials, water harvesting and recycling, the CCHP will put the Stratford City and Olympic Park developments at the forefront of sustainable design in the construction industry. 

Traditionally, developments, venues and individual buildings install their own high‑efficiency boilers and chillers to manage temperature and receive the majority of their electricity from the National Grid. The Community Energy Centres are using innovative technology to provide renewable energy and efficient energy systems; they are equipped with biomass boilers which use carbon neutral biomass fuels as well as conventional boilers which use natural gas to generate heat. The boilers are only brought online to provide hot water when the electrical load demand is reduced, thus a reduced level of hot water from the gas engines is provided. The CCHP plant is more efficient as it uses heat that is normally lost when distributed by centralised power generation through the National Grid. 

This approach means that the Energy Centre will reduce carbon emissions by between 25% and 35% and deliver cooling via one of the most efficient chiller solutions available. The Energy Centres are a fundamental contributor to reducing carbon emissions across the entire Olympic Park and Stratford City development by 50% compared to current building regulations. 

The design of the Energy Centres also allows large scale biofuel technology — which supplies the CCHP plant with the ability to efficiently heat and cool — to be added as they become increasingly advanced. The integration of improved technology is expected to generate around 25‑35% in emission reductions in future years. 

The Group’s intended use of low carbon and renewable technologies will deliver an energy source that is a tangible economic advantage to Stratford City for both the short-term and the legacy period beyond the Olympic Games. The cost of energy produced and supplied by the Energy Centres will be benchmarked against those of the open market, ensuring that end‑users — which include Westfield tenants — pay an energy tariff equivalent to, if not better than, comparable market rates.