Topside Floatover Operation

Mammoet has signed a support agreement for TenneT’s 2GW programme; one that will see it support Heerema Marine Contractors (Heerema) with the offshore installation of two giant topsides for the 2GW Programme.

Mammoet will help to prepare them for floatover operations by skidding the topsides from HTV to the newly-built Heerema H731 barge, using hydraulic skid shoes.

Final installation

After the skid-over operation, the company’s unique Mega Jack System will lift the topsides to the designated floatover height onboard the H-731. A Deck Support Frame (or floatover frame) will then be pulled underneath the topsides to enable their final installation onto jacket foundations.

TenneT’s 2GW programme will see a total of fourteen high-voltage direct current (HVDC) offshore grid connection systems, each with a capacity of 2 gigawatts (2GW), installed in the North Sea by 2032: six in Germany and eight in the Netherlands.

Key role

The innovative HVDC systems receive and send ashore power generated by wind farms in the North Sea. They convert this power from AC to DC and offer a higher transmission capacity using fewer cables.

Richard Verhoeff, Sales Director at Mammoet, says, ““With this contract, we will be playing a key role in securing the future of energy in Northern Europe while showcasing our unique capabilities in both high-precision skidding and jacking operations.