National Grid has recommended that work should proceed incrementally to reinforce and increase the capacity of the existing North East and East Coast transmission system.
The reinforcements are planned to take place in three stages; this will initially see one of the overhead lines running south from Kintore upgraded to enhance its capacity at the existing operating voltage of 275kV by 2023. This line will then be upgraded along with the existing 275kV lines running between Blackhillock substation near Keith and Kintore to operate at 400kV in 2026.
The final stage will see the proposed subsea high voltage direct current link from Peterhead to Hawthorn Pit in the north east of England by 2028.
The existing 275kV East Coast transmission line runs from Kintore in the north east of Scotland in SSEN’s transmission region to Kincardine in SP Transmission’s region.
The existing 275kV transmission lines between Blackhillock and Peterhead via Rothienorman and between Rothienorman and Kintore are also due to be upgraded as part of the recommended reinforcements. While these lines currently operate at 275kV, the towers are already capable of 400kV operation.
New substations will be required at Alyth, Kintore and Rothienorman.
31 Jan 2018