BorWin4 & DolWin4

Platform transportation and installation
Pioneering Spirit
BorWin epsilon topsides and jacket transport to installation site

Transport & installation of two 900 MW converter stations for the BorWin4 and DolWin4 offshore grid connection projects in the German North Sea.

Company: Dragados Offshore (TenneT, Siemens Energy)

Location: Borkum, German North Sea

Transport & single-lift installation of two 900 MW offshore converter stations

Deployment of all lift systems (TLS, JLS, 5000-t crane) 

Combined will supply over 2.2 million households with clean electricity

Scope of work

  • Transport of transformer topsides & jacket from fabrication yard (Cadiz, Spain) to Rotterdam for transfer to Pioneering Spirit
  • Transport to the field and single-lift installation of 12,500-tonne converter topsides (with TLS) & 8,000-tonne jackets (with JLS)
  • Lift, stab & drive the foundation piles (incl. noise mitigation) with 5000-tonne crane
  • Grout the annulus between the piles & pile sleeves
  • Perform jacket cut-off
  • ROV debris survey
Pioneering Spirit transporting the DolWin epsilon convertor station

Specials & challenges

  • Jackets & topsides transported by barge and installed in a single campaign
  • Transport & single-lift installation of complete offshore converter station (incl. piling of foundation piles)
  • Strict environmental regulations & new legislative area of operations
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