Transport & installation of two 2GW converter stations for the BalWin1 and BalWin2 offshore grid connection systems in the German North Sea.

Company: Dragados Offshore (end client Amprion Offshore)

Location: north of Norderney, German North Sea

Water depth: 39 - 42 metres

Transport & single-lift installation of two 2-GW offshore converter stations

Installation campaign 2020-30

Combined output will supply over 4 million households with clean electricity

Topsides weighing up to 33,000 tonnes, jackets up to 14,500 tonnes

Scope of work

  • Transport of 2x transformer topsides & jackets from fabrication yard to Kristiansand for transfer to Pioneering Spirit
  • Transport to the field and single-lift installation of max. 33,000-tonne converter topsides (with TLS) & max. 14,500-tonne jackets (with JLS)
  • Lift, stab & drive 24 foundation piles (incl. noise mitigation) with 5000-tonne crane
  • Grout the annulus between the piles & pile sleeves
  • Welding the topsides legs to the jackets
  • Perform jacket cut-off
  • ROV debris survey
Image
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 jacket foundation & converter topsides (incl. piling of foundation piles)
  • Strict environmental regulations & new legislative area of operations
  • Transport & single-lift installation of two 2-GW offshore converter stations
  • Combined output will supply over 4 million households with clean electricity
  • Topsides weighing up to 27,000 tonnes, jackets up to 13,000 tonnes
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