SeaMade
SeaMade is the merger of two Belgian offshore wind concessions: Seastar (252 MW, 30 turbines) and Mermaid (235 MW, 28 turbines), jointly developed as SeaMade NV.
Status
Operationallifecycle stage
Ownership
Location
BelgiumNorth Sea
Technology
Capacity
487 MW ◆
Turbines
58 × 8.4 MW ◆
Model
Siemens Gamesa SG 8-0-167 DD ◆
Foundation
Monopile ◆
Site & conditions
Site rights
Seabed rights held ∴
Origination
Belgian offshore wind zone — domain concessions (Thornton Bank–Bligh Bank) · 2004 ·
Water depth
38–40 m ◆
Distance from shore
40 km ◆
Wind speed
9.4 m/s @ 100 m ≈
Revenue & grid
Offtake
Certificate ◆
Grid
Secured ◆
Connection
Elia Modular Offshore Grid (MOG); 220-245 kV XLPE submarine … ◆
Schedule
FID
3 Dec 2018 ◆
COD
2020-Q4 ◆
Project timeline & ownership verified milestones on the spine · ownership from Hafrok’s transactions record
Origination · 2004
Belgian offshore wind zone — domain concessions (Thornton Bank–Bligh Bank)
- Awarded to
- Otary / Eneco / Elicio
- Basis
- integrated tender
From the auction results — the round that created the project.
JV formation · 2018-07
Otary RS · ENGIE Electrabel · Eneco Wind Belgium stake not disclosed
- Stake
- not disclosed
- Consideration
- not disclosed
- Announced
- 2018-07
- Closed
- 2018-12
- Project stage
- pre-FID
SeaMade NV formed July 2018 following EC approval, merging the Seastar (246 MW) and Mermaid (241 MW) concessions into a single 487 MW project. The merger was prompted by Eneco joining Otary and Electrabel in both consortia. Final ownership: Otary RS (70%), Ocean Winds (17.5%), Eneco Wind Belgium (12.5%). Ocean Winds is a 50/50 JV between EDP Renewables and ENGIE (formerly ENGIE Electrabel held the 17.5% through its Belgian subsidiary). Otary is itself a consortium of eight Belgian companies each at 12.5%: Aspiravi Offshore, DEME Concessions, Elicio, Green Offshore/Rent-A-Port, Power@Sea, Socofe, SRIW, and Z-Kracht. Financial close December 2018 for EUR 1.3bn total project. No external stake sale; records JV/project formation.
Evidence
From Hafrok’s transactions record
Dashed tick marks today (13 Oct 2026). The teal diamond on the spine is origination — the seabed award or round that created the project. Every other ownership event lives in the band below: one station per recorded deal, dated at its label, in deal order rather than to calendar scale. Secondary trades appear only at the interchanges; grey lines are parties whose entry or exit Hafrok’s record does not hold.
Announced-COD history: 2020→2020-Q4 · 2 recorded revisions · held within the year (first announced 2020, latest 2020-Q4)
Revenue & offtake contract duration and price levels · money of the day
487 MW contracted — concession
● Concession · Belgian offshore wind zone — domain concessions (Thornton Bank–Bligh Bank)
Price€79/MWh ·Capacity487 MWAwarded2004Term20 yrs
Installation how the build is going · from sourced statements and Hafrok’s registers
Installation complete
Installation · on record
StageOperational
In operation since2020-Q4
Offshore construction2019-09 → 2020-Q4
Construction ports
PortREBO Ostend ◆marshalling
Grid connection
from Hafrok’s substation, converter and cable registers
Offshore platforms · 1
Offshore substationMOG / Modular Offshore Grid·220 kV · in service 2019 · owner Elia (Belgian TSO) · also serves Northwester 2, Rentel
Grid connection · ready in time?
when each part of the grid connection is due, against the start date the developer states (black line) · a bar spans the whole year, quarter or month the source gives
installed or in serviceexpected deliveryearlier date that was later moved
Sources & verification
Rests on 17 sources (12 primary) · ◆ 6 documents held
◆Verified≈Modelled◇Sourced∴Inferred⌁Convention○Unverified∅No source·Derived
Numbers are stable citation ids — grouped by source class, so they are not consecutive.
Operator6
[1]
Eneco2018-12-03◆ SeaMade reaches Financial Close for its …
"SeaMade NV ... reaches Financial Close for its 487 MW Offshore Wind Farm in the Belgian North Sea ... Financial Close Date: December 3, 2018 ... Ownership Structure: Otary RS NV: majority stake, ENGI…
supportsFinal investment decisionTurbinesUnit capacityTotal capacity
[5]
Otary2021-10-20
“SeaMade was developed by a unique partnership between Otary, ENGIE – now Ocean Winds – and Eneco ... Otary: 70% stake in SeaMade concessions ... SeaMade NV ... 487 MW total installed capacity ... 1.8 …”
supportsBackground
[6]
Eneco2019-09-10
"Offshore Construction Start Date: September 10, 2019 ... Port Used for Construction/Marshalling: Maasvlakte 2 harbor in the Port of Rotterdam (foundation loadout) ... DP2 offshore installation vessel…
supportsOffshore construction
[8]
Port of Ostend2020-03-25
“First parts of wind farm SeaMade unloaded at the REBO terminal in Port Oostende ... The terminal will eventually receive 58 nacelles, 174 tower sections, and 174 blades for the complete installation .…”
supportsmarshalling
[19]
Royal Belgian Institute of Natural Sciences (MUMM)2026-10-12◆ MUMM permit register: milestones for the…
"MERMAID" ... "Environmental permit" ... "Granted" ... "Minister responsible for the marine environment" ... "2015-04-13T02:00:00+02:00"
supportsConsentConsent granted
[20]
Royal Belgian Institute of Natural Sciences (MUMM)2026-10-12◆ MUMM permit register: milestones for the…
"SEASTAR" ... "Environmental permit" ... "Granted" ... "Minister responsible for the marine environment" ... "2014-02-07T01:00:00+01:00"
supportsConsentConsent granted
Financier1
[2]
European Investment Bank2018-12-03
“EUR 250 million EU-financing for SeaMade offshore wind farm in Belgium ... Financial Close Date: 30 November 2018 (signing date) ... 487 MW combined capacity across 58 turbines deployed at two sites l…”
supportsTurbinesTotal capacityWater depthDistance from shore
Auction results1
[22]
RBINS / MUMM (Brabant, Degraer & Rumes, 2011 — Offshore wind farms in the Belgian part of the North Sea, ch. 2)2011◆ rbins-mumm-2011-belgian-owf-ch2
Table 1, "Overview of the dates when the projects were granted a domain concession and an environmental permit": C-Power 27/06/03 · Belwind 5/6/2007 · Eldepasco 15/5/2006 · Norther 5/10/2009 · Rentel …
supportsConcession · Belgian offshore wind zone — domain concessions (Thornton Bank–Bligh Bank)
Trade press9
[3]
Power Technology (NS Energy)2021-10
Press report — cited, not quoted; read it at the source link.
supportsTurbinesModelUnit capacityTotal capacityFoundation+3 more
[4]
Offshore Wind Biz2021-10-20◆ Belgium's Largest Offshore Wind Farm Off…
Press report — cited, not quoted; read it at the source link.
supportsCommercial operationCOD history
[11]
Enerdata2017-10-31
Press report — cited, not quoted; read it at the source link.
supportsMechanismDetail
[12]
Offshore Wind Biz2019-09-11
Press report — cited, not quoted; read it at the source link.
supportsStatusConnection point
[13]
Power Technology2024
Press report — cited, not quoted; read it at the source link.
supportsowner
[14]
Tethys (Pacific Northwest National Laboratory)2026-04-16
“Key milestones include the issuance of domain concessions for SeaStar and Mermaid by the State Secretary for Energy in 2012, following the withdrawal of a previous concession for SeaStar in 2011. Envi…”
supportsConsentConsent granted
[15]
Offshore Wind Biz2020-07-02
Press report — cited, not quoted; read it at the source link.
supportsFirst power
[16]
[21]
Offshore Wind Biz2017-10-27◆ Belgium Agrees on EUR 79/MWh for Three O…
Press report — cited, not quoted; read it at the source link.
supportsMechanismDetail