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(a) Overground projects:
14 miles of 400 Kilovolt (kV) overhead line between Norton and Spennymore was completed in 2011 to replace an existing 275 kV overhead line.
(b) Underground projects:
6.25 miles of new 400 kV underground cable was constructed in Croydon in 2010.
1.7 miles of underground cable was upgraded to400 kV in Ross on Wye in 2013.
The London Power Tunnels project is upgrading 20 miles of underground cable to 400 kV and started construction in 2010.