To main content

Borssele ALPHA/BETA

Royal Boskalis Westminster is a leading global marine contractor and services provider. With safety as our core value, we offer a wide variety of specialist activities to the oil & gas and renewa-bles sectors. These activities include marine instal-lation and decommissioning, seabed intervention, marine transport and services, subsea services and marine survey. In addition, Boskalis is a global dredging contractor, provides towage and terminal services across the globe and delivers marine salvage solutions. By understanding what drives our clients we are able to provide the solutions that enable them to meet their specific business goals. For this reason we are constantly looking for new ways to broaden and optimize our offering and are committed to expanding our proposition, supported by our financial strength. With our committed professionals in engineering, project management and operations, 800 special-ized vessels and an unprecedented breadth of activities in 90 countries across six continents we help our clients in the offshore industry push boundaries and create new horizons.

LONG-TERM DRIVERS APPLICABLE TO THE PROJECT

Generating renewable energy. Increasing energy consumption.

PROJECT CONTEXT

In the Agreement for Sustainable Growth from the Dutch government, it has been agreed that in 2023, 16 percent of the Dutch energy-supply needs to come from sustainable sources. To achieve this goal, the Netherlands need to generate more wind-energy, both on land and sea.

INTRODUCTION

The grid connection of the Borssele offshore wind area in the North Sea consists of two 700 MW connections, called Alpha (for Borssele I and II) and Beta (for Borssele III and IV). Boskalis Subsea Cables, in consortium with NKT, was awarded the contract for the supply and installation of 4 export cables and 1 intercon-nector cable. In order to execute the project in a safe and efficient manner, Boskalis has taken full advantage of the expertise and capabilities within the group. To allow the cables to be installed, shallow parts of the route are dredged and sand-waves are pre-sweeped.

BSS-III

For the project, cable burial up to 10 meters depth was required. To achieve this, a trench of 2 meters was dredged. Then the Boskalis inhouse designed burial sledge BSS-3 lowered the cable another 8.5 meter. The BSS-III is capable to bury the cables up to 8.5 m in sand and 6.5 m in hard clay. A world record for cable burial. Using the tool, Boskalis managed to limit the amount of dredging in the NATURA2000 area Westerschelde and therefore minimizing the impact on the unique environment of this nature protection area.

Related projects

Selected filters
Ineos_IRM_2018.jpg

Ineos IRM 2018

Boskalis Subsea Services was contracted by INEOS E&P A/S for the 2018 Inspection, Repair and Maintenance (IRM) campaign, involving the preparation and execution of 20-off scopes on various assets.

Haven.jpeg

Haven Jack-up upgrade

The Master Marine accommodation unit HAVEN required an upgrade for operations at the Johan Sverdrup Field.

Oman.jpg

DNO Oman block 8 LTD

DNO Oman Block 8 Ltd (DNO) is the operator of the Bukha Field, offshore Khasab, Oman. DNO entered Oman in 2012 and operates the country's only producing offshore fields on behalf of Omani Oil & Gas ministry. Boskalis Subsea Services (BSS) in recent years have assisted DNO with lifting a flare boom onto the WB Platform, making use of a DP2 offshore vessel, also Boskalis provided diving and inspection services to DNO for their SPM Offshore RAK, UAE.

Offshore_energy_heavy_transport_Dockwise_Vanguard_Aasta_Hansteen.jpg

Transport and installation Aasta Hansteen
spar platform

For the Statoil Aasta Hansteen project, Dockwise has transported the newbuild spar hull from the HHI fabrication yard in Ulsan, South Korea to the offshore discharge location near Høylandsbygd, Norway. The spar is the world’s largest spar ever built to date. 

Offshore_windfarm_heavy_transport_installation_wikinger.jpg

Transport and installation turbine foundations offshore wind farm, Wikinger

The Wikinger offshore wind farm has been developed by Iberdrola in the Baltic Sea area, within the German Exclusive Economic Zone (EEZ). The offshore site is about 34 km northeast of the island of Rügen, and covers an area of roughly 50 km², within which 70 wind turbine generators (WTG) of 5 MW and one offshore substation (OSS) are being installed. The water depths for installation range between 36 and 42 meters. When completed the windfarm will deliver 350 MW electrical power to the German national grid. The transport and installation of the 70 WTG foundations and the piles for the OSS has been carried out by Boskalis.

069dd04102016OWF-_c_Kloet.jpg

Offshore wind farm
monopile installation,
Veja Mate

Boskalis is close to completing one of its latest and most significant offshore wind projects - Veja Mate, in the German North Sea. The project involves handling and installing the biggest monopiles in the industry – weighing between 1,230-1,302-tonne a piece – using the biggest pile gripper frame and pile driving hammers in the industry with a brand new vessel, which also happens to be the biggest in the sector. Once complete, the offshore wind farm will produce over 1,6 TWh of green, renewable electricity annually.