Allseas to install topside for Norfolk Boreas

4C Offshore | Tom Russell
By: Tom Russell 12/01/2023 Allseas

Allseas has secured a transport and installation (T&I) contract for high voltage direct current (HVDC) converter station for Vattenfall’s
Norfolk Boreas project off the coast of Norfolk, UK.

Aker Solutions and Siemens Energy will provide grid connection infrastructure for the wind farm and awarded the contract to Allseas.


Allseas also has T&I options for two similar HVDC platforms for the neighbouring Norfolk Vanguard wind farm, pending an investment decision by Vattenfall. The three platforms – Boreas, Vanguard East and Vanguard West – will house HVDC conversion technology. Topsides weights are between 10,000 and 11,300 tonnes, with the jackets weighing about 3000 tonnes.


Pioneering Spirit will install the Boreas platform in 2026.

The Norfolk Boreas offshore wind farm, the first phase of Vattenfall’s Norfolk Offshore Wind Zone. Subject to a final investment decision, construction could begin this year. The 1.8 GW project could meet the equivalent electricity needs of 5% of UK households - around 1.3 million homes. It is to consist of up to 200 turbines, each with a capacity of around 10 MW. The project secured a CfD last July at £37.35/MWh (2012 prices).



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