National Grid purchased the 1950s rail tunnel in the 1990s with a view to installing new cables when original cables in the adjacent Victorian Woodhead tunnels needed renewing. National Grid began work on this project in 2007 and it is now complete. The line was originally consented in 1964 and a decision was made to use the Woodhead tunnels so that overhead lines did not cross the highest land on the route. Mitigation of the overhead lines either side of the 1950s tunnel is currently being considered with stakeholders under National Grid’s Visual Impact Provisio: http://www2.nationalgrid.com/UK/In-your-area/Visual-Impact-Provision/Projects/. The Visual Impact Provision is a £500m allocation by Ofgem to help reduce the impact of existing transmission lines in English and Welsh Areas of Outstanding Natural Beauty and National Parks. An independent process has been established by National Grid, and approved by Ofgem, to consider mitigation of overhead lines in a number of potential locations.