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<p>The Department does not hold this information. However, the Transmission Owners
have informed me that:</p><p>In England & Wales, the only major new electricity
transmission lines built in the last 10 years by National Grid are all in the London
Power Tunnels Project. This involved 32km of tunnels and 64 circuit kms installed
from 2011 to February 2016. Otherwise, major projects have been asset replacement
projects. These have generally been like-for-like, in that overhead line components
have replaced older overhead line components, and underground cables have replaced
underground cables.</p><p>In the north of Scotland, of SHE Transmission’s total new
circuits in the last 10 years (1,007km), 171km of these were underground cable (approx.
17%).</p><p>In the south of Scotland, of Scottish Power Transmission’s total new circuits
in the last 10 years (184km), 107.5km of these were underground cable (approx. 58%).</p><p>
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