Mammoet to utilize Mega Jack System on TenneT’s 2GW offshore grid program

Mammoet has secured a support contract with Heerema Marine Contractors for the offshore installation of two massive topsides as part of TenneT’s 2GW program in the North Sea.

Mammoet has secured a support contract with Heerema Marine Contractors for the offshore installation of two massive topsides as part of TenneT’s 2GW program in the North Sea.

As part of the agreement, Mammoet will prepare the topsides for floatover operations. Using hydraulic skid shoes, the company will transfer the structures from a heavy transport vessel onto Heerema’s new H-731 barge. Once in position, Mammoet’s Mega Jack System will elevate the topsides to the required floatover height. A deck support frame will then be maneuvered beneath them, enabling final installation onto jacket foundations.

The 2GW program is a key component of Northern Europe’s energy transition. By 2032, TenneT plans to complete 14 high-voltage direct current (HVDC) offshore grid connections, six in Germany and eight in the Netherlands, each with a 2GW capacity. These HVDC systems are designed to efficiently convert alternating current to direct current, transmitting larger volumes of wind-generated power to shore using fewer cables.

Richard Verhoeff, Sales Director at Mammoet, said the project highlights both the company’s offshore capabilities and its contribution to renewable energy infrastructure.

“With this contract, Mammoet 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,” said Verhoeff. “We are delighted to be working closely with Heerema and thank them for enabling us to play an even greater role in the wider energy transition.”

The floatover operations mark another milestone in the ongoing buildout of offshore wind infrastructure that will supply millions of households with clean energy across Northern Europe.