Offshore transmission: cost assessment for the Seagreen transmission assets
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This document sets out the assessment of costs which ought to have been incurred in connection with the development and construction of the transmission assets for Seagreen and details the cost assessment process we have undertaken.
Main document
[Offshore Transmission: Cost Assessment for the Seagreen Wind Energy Limited (SWEL) Offshore Windfarm Transmission Assets [PDF, 507.91KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-03/Seagreen-CAR-Final.pdf)
Subsidiary documents
[Seagreen Initial Transfer Letter [PDF, 160.20KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-03/Seagreen-Initial-Transfer-Value-FINAL.pdf)
[Seagreen Indicative Transfer Letter [PDF, 431.51KB]
](https://www.ofgem.gov.uk/sites/default/files/2025-03/Seagreen-ITV-letter-Final.pdf)
[Grant Thornton ex-ante review - Seagreen [PDF, 1.36MB]
[Grant Thornton ex-post review - Seagreen [PDF, 2.22MB]