The SeaMade offshore wind farm is a 487MW wind power project being developed in the Belgian section of the North Sea.

The €1.3bn ($1.47bn) wind farm will be built and owned by Seamade, a joint venture of Otary (70%), Engie Electrabel (17.5%) and Eneco (12.5%).

Seamade achieved financial closure for the project in December 2018. Construction is expected to commence in 2019 and is scheduled for completion in 2020.

The wind farm will generate enough renewable energy to power 485,000 households in the region and will offset 500,000t of CO2 emissions a year.

The project is expected to create 1,400 direct and 1,400 indirect jobs during the construction phase and 100 jobs once operational.


The SeaMade offshore wind project integrates two sites known as Mermaid and Seastar in the Belgian exclusive economic zone (EEZ).

The Mermaid site is located approximately 50km from the Belgian coast and will host 28 turbines with a total capacity of 235MW. Located approximately 40km away from the coast, the Seastar site will accommodate 30 turbines with a total capacity of 252MW.

The SeaMade windfarm will be operated from Otary’s logistics hub located in the port of Ostend.

SeaMade wind farm make-up

The SeaMade offshore windfarm will feature 58 Siemens Gamesa Renewable Energy (SGRE) SG 8.0-167 DD wind turbines.

Fitted with a 167m diameter rotor and 81.5m-long blades, each SG 8.0-167 DD wind turbine will have a swept area of 21,900m².

Each turbine will weigh approximately 465t and will feature variable speed system with pitch-regulation mechanism. The hub height of the turbines will be 109m.

Transmission from SeaMade offshore wind farm

The electricity generated by the turbines will be transmitted to substations located at Seastar and Mermaid sites through inter-array cables.

The two offshore substations will step-up the voltage from 33kV to 220kV. The 220-245kV submarine high-voltage cables will then transmit the electricity from the substations to ELIA’s Modular Offshore Grid (MOG) located 40km off the coast of Zeebrugge.

The submarine cables will have a combined length of 28km and a diameter of 247mm, and will weigh approximately 96.4kg per running meter.

The MOG will have a capacity of 1,030MW and will receive the energy produced from Rentel, Mermaid, and Northwester 2 wind farms in the Belgian North Sea.


The SeaMade project is being funded by a consortium of 14 commercial banks as well as the Danish Danish export credit agency (EKF).

KfW IPEX-Bank signed an agreement for a €160m ($181m) debt facility, while European Investment Bank (EIB) committed to offer a loan of €250m ($283m) for the project.

Contractors involved in SeaMade offshore wind farm

SGRE received a contract to supply and install 58 SG 8.0-167 DD offshore wind turbines in December 2018. The order also includes a 17-year long-term service agreement.

Eneco signed a power purchase agreement (PPA) to buy all the energy generated by the SeaMade windfarm, in December 2018.

A consortium of ENGIE Fabricom, Tractebel, Smulders, and GeoSea was awarded a contract for the engineering, procurement, construction and installation (EPCI) as well as transport and commissioning of the substations at the Seastar and Mermaid sites.

In December 2018, Seamade placed a contract with Tideway-Hellenic Cables consortium to supply and install the submarine export cables to connect the windfarm to the Belgian grid. The cables will be produced by Hellenic, while installation will be performed by Tideway.

Dredging International was awarded the EPCI contract for the foundations and 33kV inter-array cables.