Allseas completes installation of DolWin kappa offshore converter station

Allseas has completed the installation of TenneT’s 900-megawatt DolWin6 kappa offshore converter station for the offshore grid connection system in the German North Sea – including piling of jacket foundations. This 12-day operation, completed on Sunday, is their first platform installation in offshore wind.

The 5,000-tonne foundation jacket and 11,000-tonne topsides housing high-voltage direct current (HVDC) technology were installed from Pioneering Spirit, using the topside and jacket lift systems. Additionally, to secure the foundation jacket, a 5,000-tonne special purpose crane was deployed to drive the 10 foundation piles up to 68 metres deep into the seabed.

Siemens Energy was commissioned by TenneT as the general contractor to build the system. The offshore converter station was built at the Dragados Offshore shipyard in Cadiz, Spain. It then arrived in the Port of Rotterdam in mid-August on Allseas’ cargo barge Iron Lady.

This installation is key to furthering North Sea wind energy capacity, and in turn, supports European energy security. Indeed, TenneT’s DolWin6 connection will provide more than 1 million homes with renewable energy when it comes online in 2023.

Author: Emma Dailey

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