Offshore Foundations

Zeevonk has named the installer for its first 69 foundations

Published 20 July 2026 Updated 11 August 2026 Publisher IMWO Region Europe Confidence Confirmed
DEME offshore installation vessel Orion carrying monopiles in the image published with the Zeevonk foundation contract announcement

DEME Group; image published with the Zeevonk foundation-installation contract release

DEME will transport and install 69 monopile foundations for the 1,062.6 MW wind component of Zeevonk's first permitted phase. Its contract also covers steel marshalling, intermediate transport and a filter layer for scour protection. The owner still has to disclose the port, vessel spread and offshore start.

Published scope and current milestone

DEME's 20 July 2026 release confirms intermediate monopile transport, steel marshalling, transport and installation of 69 foundations, and a scour filter layer. The 6 August 2025 Staatscourant instrument fixes the two permit holders, phase responsibilities and exact capacities. Vattenfall supplies the 2029 owner target. The separate TKF award covers cable design, manufacture, testing and delivery, not installation. The marshalling port, installation vessel, fabricators, offshore start and acceptance regime remain unpublished.

Asset delivery and installation implications

The amended permit now gives the package a precise phase boundary: phase 1 combines 1,062.6 MW of wind with 6 MWp of offshore solar. DEME's award ties steel receipt, marshalling, offshore transport, foundation installation and filter-layer placement into one chain. The port and vessel plan will determine how 69 large components move into the North Sea campaign scheduled to support 2029 delivery.

Evidence conclusion

Delivery, handover and operating evidence

The contract award sits inside a separately licensed phase and does not establish offshore progress. DEME has the foundation installation scope, but the release does not assign a vessel or name a marshalling base. The cable picture is also incomplete: TKF will supply about 162 km of 66 kV inter-array cable, while the installer remains unnamed. Fabrication allocation, port selection, vessel mobilisation and the first foundation will mark the move from contract award to offshore campaign.

Outstanding evidence

  • Foundation fabrication and secondary-steel awards
  • Marshalling port and delivery sequence
  • Installation vessel and feeder strategy
  • UXO survey and clearance
  • Underwater-noise and ecological controls
  • First monopile and filter-layer installation
  • Inter-array cable installation contractor
  • As-built and acceptance evidence

Related records 1

Subject index

Related subjects

These subject pages bring together related projects, technical articles, reports, and evidence methods.

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