One of the contracted performance requirements for stations across the route is the need to the reduce whole-life carbon footprint by 50%, from an agreed baseline.
Since February 2018, WSP's carbon experts have worked in close conjunction with HS2 and the Birmingham Curzon Street Station designers, not only to agree a clear and justifiable baseline for the scheme (which made significant improvements over the original concept), but to identify, secure and calculate the benefits of opportunities to improve carbon performance over the 120-year scheme lifecycle.
Examples of where the design and associated cost plan has been evolved to reduce carbon include:
- The movement of the Back of House areas to reduce 'cut and fill', refinement and ‘thinning’ of pavement specifications
- Use of pre-fabricated (rather than in-situ pour) beams
- Incorporation of timber – not aluminium – soffits to the main station roof
- Agreement to use recycled sub-base under hard landscaping
- Working with HS2 to commit to using renewable energy sources during construction
- Over the life of the scheme, specification of low carbon concrete and use of low carbon technology installations to achieve net zero carbon emissions for the building regulated load.
To date, the hard work of the integrated design team has achieved a 43% reduction in lifetime carbon, which equates to more than 64.6MkgCO2e. This saving is equivalent to 184,085 London to Hong Kong return flights, 7,514 car journeys around the world, or 0.9 billion cups of tea
By James Robb, Senior Sustainability Consultant - Sustainable Places, Energy & Waste and Fiona McGarvey, Senior Consultant -Sustainable Places, Energy & Waste