ENGIE, GeoSea and Smulders build offshore substations for SeaMade

The consortium comprised of ENGIE Fabricom, Tractebel, Smulders and GeoSea was awarded a contract for the construction and installation of SeaMade offshore wind farms in the North Sea. The consortium will build the two high-voltage substations and associated substructures for the Mermaid and Seastar zones.

SeaMade NV

SeaMade is the joint name of two offshore wind projects in the Belgian North Sea zone, Mermaid and Seastar. Mermaid, which is located about 50 km off the Belgian coast, has a capacity of 235 MW, while Seastar is slightly closer to the mainland at 40 km, and has a capacity of 252 MW.
SeaMade will consist of 58 SGRE (Siemens Gamesa Renewable Energy) wind turbines, and supply enough green energy to power approximately 485,000 households. This project will avoid emissions of 500,000 tonnes of CO2 per year.

Consortium with a proven track record

After the successful collaboration on a number of other offshore wind farms, ENGIE Fabricom, Tractebel, Smulders and GeoSea decided to join forces for the SeaMade project. The companies will be responsible for the complete EPCI (engineering, procurement, construction, transport, installation and commissioning) of both high-voltage substations.

Renewable energy as a key element in the energy transition

Renewable energy sources are playing a key role in the decarbonisation of our energy landscape. The offshore wind farms in the North Sea are playing a particularly important role in Belgium’s climate plan for achieving European targets.

To help this energy transition, the consortium’s various partners have pooled their expertise.

ENGIE Fabricom is responsible for coordinating the overall design, and integrating all the systems of the offshore substations at the construction site in Hoboken. ENGIE Fabricom is also responsible for the low-voltage and auxiliary systems, and for Piping & Mechanical.

Tractebel is in charge of the basic and detailed engineering, procurement, testing and commissioning of the HV and MV equipment.

Smulders is taking care of the entire engineering, procurement, fabrication and corrosion protection of the steel structures for the topsides, and the substructures consisting of the transition pieces and monopiles.

GeoSea is handling the transport and installation of the topsides and substructures from onshore to their final offshore locations.


About ENGIE Fabricom

ENGIE Fabricom designs, builds and maintains combined technical installations for companies and local authorities. Many of the company’s solutions are designed to improve mobility, safety, distribution networks, and the share of renewable energies, and to optimise operational and energy performance in industry. ENGIE Fabricom and its subsidiaries operate both inside and outside Belgium. With more than 6,000 employees, their joint turnover in 2017 was € 1.27 billion.

About Tractebel

Tractebel is at the forefront of the energy transition, and provides a full range of engineering and consultancy services, including design and project management, throughout the lifecycle of its customers’ projects. As one of the world’s largest consulting and engineering firms, and with more than 150 years of experience, it defines its mission as actively shaping the world of the future. The company employs 4,500 specialists in branches in 33 countries, who work together with clients on multidisciplinary solutions in energy, water and infrastructure.

About Smulders

Smulders is an international steel construction company with a proven reputation in the engineering, production, delivery and assembly of steel structures. These tend to be heavy, technically complex and architectural. Smulders has more over 50 years of experience in its field, and was already the first choice for offshore wind structures in the pioneering days of wind energy more than 15 years ago. Today, Smulders is an established market leader, and has already delivered 20 substations, more than 1,500 transition pieces, and more than 100 jackets.

About GeoSea

GeoSea is a subsidiary of DEME, and specialises in complex offshore hydraulic engineering projects. GeoSea provides a wide range of services to owners of offshore installations, water construction consultants and contractors in the offshore oil & gas, renewable energy and civil engineering sectors. These services include hammering and drilling large-diameter monopiles and bases for offshore structures such as piers, mooring facilities, bridges, offshore wind farms, installing offshore structures and platforms, and conducting geotechnical surveys at great depths.

About SeaMade

SeaMade NV, whose name is based on SEAstar and merMAID, is a collaboration between:

  • Otary RS NV – 70%
  • Electrabel NV – 17.5%
  • Eneco Wind Belgium SA – 12.5%

About Otary RS NV

The Otary partnership is comprised of a number of Belgian specialists in renewable energy, including investment and development companies Green Offshore and Power @ Sea, dredging company and marine engineering specialist DEME, and green energy players Aspiravi and Elicio. Otary’s shareholders are Walloon environmental holding company SRIW Environnement and the Flemish and Walloon energy and utility supply companies Z-Kracht/Nuhma and Socofe.
In addition to the SeaMade concessions, Otary also holds the concession for Rentel.


Press contacts:


Britt Weckx – Marketing Coordinator
Phone +32 114 672 281
E-mail. britt.weckx@smulders.com

ENGIE Fabricom

Anne-Sophie Hugé – Head of Press Office, ENGIE
Phone +32 518 60 20
E-mail. anne-sophie.huge@engie.com


Pierre Cerckel – Head of Sales, Energy Storage and Transmission
Phone +32 2 773 74 87
E-mail. pierre.cerckel@tractebel.engie.com


Vicky Cosemans – Head of Communications, DEME Group
Phone +32 3 250 59 22
E-mail. cosemans.vicky@deme-group.com


Mathias Verkest – CEO of SeaMade
Phone 499 55 49 80
E-mail. Verkest.mathias@otary.be