capital carbon

Operational carbon

A Smaller Footprint

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ODI 1 of 2

Capital Carbon

This is the carbon emitted as a result of construction projects we undertake. We follow the principles set out by HM Treasury's Infrastructure Carbon Review to release the value of low-carbon solutions in how we build and operate.

Over the five-year period to 2020 our goal is to deliver a 60 per cent reduction in capital carbon from a 2010 baseline.

Our design engineers and capital delivery teams have delivered a 55 per cent reduction in capital carbon against our 2010 baseline, through focus on design, materials used and installation and commissioning techniques in construction.

ODI 2 of 2

Operational Carbon

We follow the principles set out by HM Treasury's Infrastructure Carbon Review to release the value of low-carbon solutions in how we build and operate. Over the five-year period to 2020 our goal is to exceed a seven per cent reduction in real terms in gross operational carbon from a 2015 baseline.

Annual gross operational carbon emissions have decreased by 11 per cent in 2016/17 in comparison to the 2014/15 baseline, reducing from 455,335 t/CO2e to 403,099 t/CO2e. The main influencing factors include grid electricity demand reduced by 2.3 per cent, an increase in renewable energy generated to 113 GWhs (includes biogas, wind and solar, appointed and non-appointed) and 13 GWhs saved through our Energy Initiative. Other external factors included a 16.4 per cent reduction in grid electricity emission factor and an increase in the methane global warming potential.

Greenhouse gas emission data has been measured and reported in line with the Defra Environmental Reporting Guidelines published in June 2013. Annual net operational carbon emissions have decreased by 12 per cent in 2016/17 in comparison to the 2014/15 baseline reducing from 446,834 t/ CO2e to 393,089 t/CO2e.