What we do

Challenge

The Rentel offshore wind farm is a 309 MW offshore wind concession located approximately 34 km from Zeebrugge in the Belgian North Sea. The project was developed by Rentel NV, a consortium of eight Belgian shareholders, including DEME Group, Otary Offshore Energy and Elicio NV and represents a total investment of EUR 1.1 billion.

Rentel wind farm comprises 42 Siemens turbines of 7.35 MW and supplies CO2-friendly electricity to approximately 285,000 households. The wind turbines are installed on monopile foundations and connected through 33 kV inter array cables to an offshore transformer station (OTS). The substation is connected by a 220kV submarine cable to the onshore substation of Stevin in Zeebrugge. Water depths range between 26 m and 36 m below LAT.

Solution

Our wide-ranging scope included the responsibility for the design of the scour protection, foundations and inter array cables; for the transport and installation of the turbines and for the offshore substation. The scour protection is a two-layer system: the filter layer was installed prior to the foundation installation and the armour layer after the pull-in and termination of the cables.

The foundations for these large turbines comprise a monopile (MP), with a weight up to 1,250 tonnes and a length up to 83 metres, and a transition piece (TP) on top with a length of 22 metres and a weight of 325 tonnes. The MP and TP are connected by a conical grouted connection.

Our heavy lift jack-up vessel ‘Innovation’ installed the foundations. However, we faced several major challenges during the installation including the handling and manipulation of the heavy and large MPs and the soil conditions were not ideal for the jacking operations and pile hammering.

We also used a single, big bubble curtain to reduce the underwater noise level during piling operations. Each of the three sections of the inter array cables were delivered in one length and cut on site. Additionally, we performed the transport and installation of the cables and the OTS foundation was transported and installed by our jack-up vessel ‘Innovation’ and the OTS topside by the heavy lift vessel ‘Rambiz’ (Scaldis).

Used technology

Offshore installation vessels

Fallpipe vessels

Cable installation & multipurpose vessels

Heavy lift vessels

Related jobs

All jobs

Technical Expert - Gearboxes

As a technical expert - Gearboxes, you will play a key role in providing technical support to our internal stakeholders related to all aspects of maintenance activities, troubleshooting & improvement initiatives on the installed gearboxes in our fleet and there direct related systems. Mainly through maintenance plans are set-up and prepared through workorders in our asset management system ensuring equipment is maintained to the highest standard and reliability with a long-term vision. Additionally, extending your external network of suppliers & service providers will be key for expanding your knowledge.

DEME General

Technical

Belgium

See details

Operational Buyer

The Operational Buyer is responsible for the execution, monitoring and aftercare of the purchasing process and managing the purchasing administration, within the guidelines and procedures of the department, in order to support the department and the internal customer(s) for the timely processing of requests and purchase orders. Focuses on account quality, lead time, on time in Full delivery, customer satisfaction, supplier management and optimization of the Total Cost of Ownership

DEME General

Supply Chain / Procurement

Belgium

See details

Contract Manager India

DEME is a global leader in dredging, marine engineering, and environmental remediation, with over 140 years of expertise. Known for its pioneering approach to innovation and technology, DEME has established a strong international presence, working across more than 90 countries worldwide. Although rooted in Belgium, DEME operates in all seas and on all continents.

In an operational environment with complex contract structures, high client expectations, and increasing regulatory constraints, DEME is seeking a Contract Manager to support its operations in India. Based in our Chennai office, you will assist in the execution of the regional projects from a contractual-technical perspective, managing contracts with clients, main contractors, and related subcontracts and supply agreements.

DEME General

Legal & Insurance

See details

HR Specialist

As HR specialist you will provide support for 2 HR business partners in their daily operations which include amongst others recruitment, staffing, training & development, performance monitoring & employee counseling.

There are no direct supervisory responsibilities, and you will report to the HR BP Group Manager.

DEME General

Belgium

See details

Electrical technical expert

As an Electrical Technical Expert at DEME, you will be responsible for designing, developing, and maintaining electrical systems, with a specific focus on maritime navigation and communication equipment. You’ll work closely with internal stakeholders and act as the point of contact for external suppliers and repair facilities. Your role ensures that all activities comply with maritime regulations and safety standards.

DEME General

Technical

Belgium

See details

Technical Expert - Cranes

As a Technical Expert, you will be responsible for providing specialized technical support for our offshore ships, focusing on our fixed cranes. You will work closely with internal stakeholders, ensuring that all technical systems and equipment are maintained to the highest standard. This role involves creating and preparing work orders, developing maintenance plans, and collaborating with external suppliers and service providers to ensure knowledge exchange and optimal system performance.

DEME General

Technical

Belgium

See details

Electrical Expert Engineer

DEME Concessions offers integrated capabilities, bringing together state-of-the-art expertise and top partners to focus on useful and economically viable long-term projects in the ports and maritime, offshore wind, green hydrogen and infrastructure sector that benefit concession owners, users and private-sector partners alike.

Epitomizing DEME’s concession-construction model, DEME Concessions is committed to the DEME Group’s values of social and environmental responsibility towards all its stakeholders, and to its on-going endeavor to make a positive contribution.

To support its expanding activities DEME Concessions is looking to strengthen its team with an Electrical Expert Engineer. The Electrical Expert Engineer is responsible for providing electrical project support and services from his/her expertise throughout the different development phases of Green Hydrogen market and be directly involved with multidisciplinary project development teams for projects around the world.

DEME General

Technical

Belgium

See details

Office Accountant | Lambersart

This position provides accounting support across DEME business entities in France while interacting with the accounting team lead and Finance Manager France.

DEME General

Finance

France

See details