Heerema, Allseas to install 14 offshore platforms for TenneT
Pioneering Spirit installation of DolWin kappa topside. Image by TenneT.
TenneT said today it has inked multi-year framework agreements with Heerema Marine Contractors and Allseas for the transport and installation of at least 14 offshore platforms of 2 GW each in the Dutch and German parts of the North Sea.
This means that the grid operator has now awarded all major framework agreements for its 2GW Programme for the deployment of standardised 2-GW offshore grid connection systems in Germany and the Netherlands.
The latest framework deal encompasses 28 lots until 2031, 14 for jackets and 14 for topsides, with about 60% of them awarded to Heerema and the remainder to Allseas. Future projects beyond 2031 can also be added to the contracts.
The HVDC suppliers responsible for the construction of the jackets and topsides for TenneT -- Hitachi Energy/Petrofac, GE/Sembcorp, GE/McDermott, and Siemens/Dragados -- can choose from the suppliers whereby Heerema and Allseas can install both jackets and topsides, explained the grid operator.
Heerema will use the semi-submersible crane vessel (SSCV) Sleipnir as well as an owned floatover barge, while Allseas will use its single-lift installation vessel Pioneering Spirit. Both vessels have been deployed for TenneT projects before.
As a subcontractor to Allseas, Boskalis will build one or two new transport vessels specifically for the 2GW Programme.
"With this agreement we secure global marine transport and the heaviest offshore installation capacity in the market for our HVDC partners while expanding transport capacity in the market,” said TenneT chief operations officer Tim Meyerjuergens.
The company has been able to accelerate the process of making deals with suppliers thanks to its new approach of tendering long-term framework agreements.