Allseas has secured additional transport and installation (T&I) work for the Pioneering Spirit in the offshore wind industry. The company has won contracts to provide services for Vattenfall’s Norfolk Boreas project off the coast of Norfolk, UK.

Aker Solutions and Siemens Energy will provide grid connection infrastructure for the Norfolk Boreas Offshore Wind Farm. On 15 December, the former awarded Allseas with the T&I contract for the Boreas high voltage direct current (HVDC) converter station.

Pioneering Spirit will install the Boreas platform in 2026. Allseas‘ Pioneering Spirit is the largest vessel in the world and capable of lifting and transporting entire platform topsides of up to 48,000 tonnes in one piece using motion-compensated single-lift technology. The twin-hulled vessel is 382 metres long and 124 metres wide.

Also read: Pioneering Spirit’s single-lift capacity to be extended to 60,000 tonnes

Norfolk Boreas

Located 47 kilometres off the Norfolk coast and with a capacity of 1.4 GW, Norfolk Boreas is the first phase of Vattenfall’s Norfolk Offshore Wind Zone. The Wind Zone will produce enough renewable electricity to power around 4.6 million homes and save around six million tonnes of CO2 when fully operational.

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.

Also read: Allseas wins one of the heaviest offshore installation projects to date