Contaminated Land

We manage an inherited portfolio of historically contaminated land including former manufactured gas plants, industrial landfills, former gas holders and older substations on our transmission and distribution networks. Sites can sometimes have a complex mix of contamination dating back over 100 years.

The main focus of our remediation programme is on managing the environmental risk by targeting those with the highest environmental risk profile and those where we have a legal or regulatory requirement to remediate, while returning land to productive public or private use where we can, and where it is surplus to operational requirements.

National Grid manages land contamination issues on 529 sites (not including KeySpan sites), the majority of which were previously used for gas production. In the US, this includes obligations in relation to land owned by third parties. During 2007/08, environmental work stages were completed on some 189 sites of which 33 included remediation.