Tennet News

The North Sea Boulevard and Maasvlakte Boulevard are reopened to traffic as TenneT's cables for connecting two offshore wind farms are now buried in the seabed along the road. The high-voltage cables for the future IJmuiden Ver Beta and IJmuiden Ver Gamma offshore wind farms have been installed by contractor NRG.In a few years, the green energy from the offshore wind farms will arrive onshore via cables buried in the seabed near Maasvlakte and will then be distributed to industry…

Belgian offshore contractor Jan De Nul has concluded the 2025 transport and installation campaign of three HVAC grid connection cables at TenneT’s DolWin kappa platform.When finalized, these cables will ensure the transport of almost 660 MW renewable electricity from two offshore wind farms, which is enough energy needed to power more than 800,000 German homes.Jan De Nul and partner Hellenic Cables are responsible for design, production, transport, installation and protection of three 155 kV HVAC cables with a total length of 37 km.

A consortium of GE Vernova and Singapore’s Seatrium has secured a major contract from Dutch-German grid operator TenneT to deliver the BalWin5 offshore grid connection, a 2.2 GW high-voltage direct current (HVDC) transmission system designed to bring North Sea wind power to Germany’s electricity network.BalWin5 is expected to provide enough renewable electricity to supply about 2.75 million households, forming part of Germany’s strategy to accelerate offshore wind deployment and…

Singapore-based engineering group Seatrium has reported strong execution in the third quarter ended September 30, 2025, bolstered by major offshore and wind project deliveries, a high-value order book and strategic asset sales.The group’s net order book stood at about $12.8 billion (S$16.6 billion), covering 24 projects slated for delivery through 2031. During the third quarter of 2025 the company completed the wind turbine installation vessel Charybdis and the offshore substations Greater Changhua 2b and 4…

Belgian marine contractor Jan De Nul has launched its newest cable laying vessel (CLV), the Fleeming Jenkin, at the CMHI Haimen shipyard in China, which has now entered the final phase of construction ahead of delivery planned for second half of 2026.The 215-meter-long vessel has a loading capacity of 28,000 tonnes, making it the world’s largest of its kind.Jan De Nul will use the vessel to install subsea cables for the transmission of renewable energy, as the Fleeming Jenkin was specifically designed to install longer and heavier cables in ultra-deep waters up to 3…

Offshore contractor Allseas has signed a construction contract with Guangzhou Shipyard International (GSI) in China for a purpose-built semi-submersible heavy transport vessel (HTV), marking a major expansion of its fleet capabilities.The vessel, to be named Grand Tour, is scheduled for delivery in the first quarter of 2028. With a load capacity of 40,000 tonnes, the ship will be designed to carry the world’s largest offshore structures across oceans and transfer them to Allseas’ flagship vessel…

Mammoet has signed a contract with Heerema Marine Contractors to support topside floatover operations for TenneT 2 GW offshore grid project in the North Sea.Mammoet will help prepare two giant units for floatover operations by skidding the topsides from HTV to the newly-built Heerema H731 barge, using hydraulic skid shoes. After the skid-over operation, Mammoet’s mega jack system will lift the topsides to the designated floatover height onboard the H-731.A deck support frame, or floatover frame…

Bernhard Schulte Offshore announced the delivery of its latest Commissioning Service Operation Vessel (CSOV) from Ulstein Verft in Norway. The newbuilding, which was christened ‘Windea Curie’ on June 26, is now being deployed for the charterer TenneT, an offshore transmission system operator in the European Union, to support its offshore grid connection facilities in the North Sea.‘Windea Curie’, which utilizes Ulstein’s TWIN X-STERN design, features two sterns and azimuth propellers located at both fore and aft…

In the coming years, grid operator TenneT will bring wind energy from the sea to land on the Maasvlakte. To enable the landing of these electricity cables, contractor NRG started six drillings under the dunes May 26. Three more will follow after the summer. In recent days, NRG has made the necessary preparations both inside the dike and on the beach. The electric drill is making a horizontally directional drilling over a distance of approximately 200 meters towards the beach.

Two weeks after the successful load out, the steel topside for the Hollandse Kust (west Beta) substation platform is ready to leave the port of Hoboken near Antwerp in the Netherlands for its final North Sea destination.The topside is schedule to leave the Dutch port on May 17, on a floating pontoon via the Scheldt and the Western Scheldt towards the North Sea.As soon as Heerema Marine Contractors’ installation vessel Sleipnir has completed its current job in British waters, it…

RWE and TotalEnergies have selected the port of Eemshaven in the northern Dutch province of Groningen as the base for turbine assembly and construction work for their joint offshore wind project OranjeWind in the Dutch North Sea.The OranjeWind joint venture has signed an agreement with Buss Terminal Eemshaven, with the pre-assembly and offshore construction of turbines to be carried out in 2027.Construction activities at the offshore wind site will start in early 2026. Buss Terminal Eemshaven will facilitate the offloading…

Seatrium has signed a Letter of Intent (LOI) with Japan-based Penta-Ocean Construction (POC) to carry out early engineering work for a 5,000t fully-revolving heavy lift vessel project for the Japan wind market.Subject to the final investment decision by POC, the full EPC contract award is expected in 1Q 2025.POC owns a range of self-propelling trailing suction hopper and cutter suction dredgers for marine construction works as well as two turbine installation vessels equipped with a 800t and a 1,600t lifting capacity crane respectively.

A power outage in the Rotterdam port area in the Netherlands briefly interrupted operations at one of Europe's biggest oil refineries on Tuesday, the plant's operator BP said.Electricity grid operator TenneT said the problem was solved shortly after 1000 GMT.

Seatrium Limited returned to profitability in the half year ended 2024, the first time since its formation in 2023.Seatrium recorded a revenue of S$4.0 billion for 1H2024, a notable 39% growth from S$2.9 billion for 1H2023, mainly due to progressive revenue recognition from newbuild projects and increased repairs and upgrades activities.The Group’s underlying performance also improved. Seatrium’s underlying EBITDA was S$390 million for 1H2024, excluding the one-off provision of S$79 million for the full and final settlement to MH Wirth.

Boskalis’ cable-laying barge Giant 7 has started the installation of the second and final nearshore export cable for the 700 MW offshore wind farm Hollandse Kust (west Beta), being built offshore the Netherlands.The works on the second cable follow the successful installation of the first, also performed by Boskalis’ Giant 7 barge.Giant 7, with the help of the specialist burial sledge tool BSSIII, will repeat the same operation to bring and connect the second cable to the shore.The two 220kV AC export cables are needed to connect the offshore wind farm to the onshore power grid…

Offshore installation services company Jan De Nul has ordered another XL cable laying vessel (CLV), identical to the Fleeming Jenkin, which boasts ‘unrivalled cable-carrying capacity’.Like the Fleeming Jenkin, the vessel will be 215 meters long and can transport 28,000 tonnes of cables.This will make them the largest capacity cable-laying vessels in the world, according to Jan De Nul.Thanks to cutting-edge technology on both vessels, designed by Jan De Nul Group's own specialists, they can lay cables in both shallow and ultra-deep waters up to 3,000 meters.

DEME has been awarded two contracts from cable solutions provider Prysmian for the engineering and installation works for the IJmuiden Ver Alpha and Nederwiek 1 offshore grid systems in the Netherlands, whose combined worth is over $315 million.This is the most extensive cabling award in DEME’s history and marks the company's first project involving Prysmian’s 525 kV HVDC cable technology, featuring increased transmission capacity, according to the company.The contracts encompass cable installation…

Jan De Nul Group together with its consortium partners LS Cable & System and Denys has signed the contracts for two 525 HVDC cable systems for the two grid connection systems BalWin4 and LanWin1. These mark the first two contracts signed under the long-term framework agreement that TenneT and Jan De Nul have signed earlier this year. The projects comprise the design, manufacturing, transport, installation, protection and testing of three 525 kV cable systems for connecting offshore…

Dutch shipbuilding conglomerate Damen announced it has delivered a new shallow draft vessel to the German energy infrastructure construction company Bohlen & Doyen Bau GmbH, a subsidiary of Friedrich Vorwerk. The new Multi Cat 1908 SD workboat, named Scholle, is the first marine asset to be bought by the company in many years.The 19.4-meter vessel has been bought for use on a multi-year project supporting transmission system operator TenneT on its offshore grid connection systems in the North Sea.

France-based Nexans has announced an expansion in its presence in the offshore wind and interconnection market, by adding a third cable laying vessel to its fleet.This strategic decision will allow the Group to meet the increasing demand for electrification, especially in the American and European markets, driven by a record project backlog and recently strengthened by contracts for TenneT and the section of the EuroAsia Interconnector that connects Greece and Cyprus.Building upon the technology featured on Nexans' flagship vessel…

Germany boosted its offshore wind power capacity by 357 megawatts (MW) to 7,036 MW last year, inching towards a planned 30,000 MW by 2030, power grid operator TenneT said.The German arm of the Dutch transmission group will play a key role in achieving the target, linking the majority of new wind farms to onshore high-voltage transmission grids, with a commitment to provide six 2,000 MW links by 2031.

Italian subsea cable firm Prysmian Group said Thursday it has added a new vessel - Barbarossa I - to its fleet."After the debut of the state-of-the-art 170-meter Leonardo da Vinci [vessel] in August 2021, Prysmian Group’s fleet would seem to be complete. But with the addition of Barbarossa I, Prysmian Group becomes the first company in the sector that can provide the full range of submarine cable-laying solutions from the shallowest coastal waters in Northern Europe to the profoundest depths of the Mediterranean Sea.

Dutch/German grid operator TenneT said Monday that the 900 MW offshore substation platform DolWin kappa had sailed away from the Dragados Offshore shipyard in Cádiz, Spain. "TenneT will soon be reliably bringing even more green wind power from the German North Sea to land via the direct current connection DolWin6," TenneT said in the announcement of the sailaway which took place on August 5, 2022."After only three years of construction, the platform is now on board the transport barge “Iron Lady” and on its way to the Dutch port of Rotterdam.