Lloyd's Register ensures the safety of the platform installation on TenneT's BorWin gamma project in its key role as the certifying authority.



General contractors consortium:
SIEMENS AG and Petrofac

The North Sea - 54º 23' 17” North, 6º 22' 49” East

Renewables – Offshore Wind

Asset type:
BorWin gamma, 900 MW Offshore HVDC (high-voltage, direct current) Converter Platform

Lloyd's Register was appointed the independent third party certifying authority.

Client background

TenneT is the owner of the leading European electricity transmission system operator (TSO) with activities in the Netherlands and in Germany. As the future owner and operator of the HVDC converter offshore platforms in the North Sea, TenneT is responsible for the delivery of the energy transmission to the onshore grid.

About the project

The converter platform ‘BorWin gamma' will be installed in the German Exclusive Economic Zone in the North Sea. The platform will enable the power produced from several offshore wind farms to connect to the grid, by converting the AC power from the wind farms to DC and transmitting it to the shore.

SIEMENS and Petrofac are contracted by TenneT to design, build and install the platform. The topsides will be fully fabricated, assembled, integrated and tested for preliminary pre-commissioning conditions on-shore and transported to the offshore location.

How Lloyd's Register helped

Lloyd's Register was appointed the independent, third party, certifying authority for the project by TenneT and is recognised by the German Federal Maritime and Hydrographic Agency.

In our role as the Certifying Authority, LR is evaluating and certifying the project, including the design, construction, transport and installation and commissioning.

Key areas of scope:

Design appraisal activity:

  • Hazids/hazops
  • Fire and safety
  • Electrical, instrumentation and control
  • Geotechnical, fixed structures and corrosion protection
  • Materials, welding and NDE
  • Mechanical piping process and axillary systems
  • Environmental

Onshore fabrication and installation survey:

  • Fabrication and pre-commissioning

Transport, installation & commissioning survey:

  • Assembly and pre-commissioning


Early involvement = Reduced risk and cost:

During the design development phase of the project, qualified reports were examined by Lloyd's Register's technical experts, with the main aim of minimising risk by eliminating potential errors early on in the process. Finding errors further down the line would have greatly increased costs.

Good communication essential for project success:

Our expert engineers evaluated the project documentation. The constructive and collaborative relationship meant they were able to raise any issues or queries with TenneT and their sub-contractors in an open environment. Communication with the project partner was clear and regular, enabling amendments and modifications to be implemented into the design quickly and efficiently.

Ensuring compliance with key standards:

Lloyd's Register has drawn up a certification scheme in consultation with TenneT, the Duty Holder. The certification activities were examined for compliance with the requirements of the national regulations (BSH-Standard) and international offshore standards.

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