Nordsee One
Adjacent to Nordsee Ost (295 MW) and Amrumbank West (302 MW) in the Helgoland cluster.
Status
Operationallifecycle stage
Ownership
Northland Power — 85% ◇
RWE — 15% ◇Location
GermanyNorth Sea
Technology
Capacity
332 MW ◆
Turbines
54 × 6.15 MW ◆
Model
Senvion 6 2m126 ◆
Foundation
Monopile ◆
Site & conditions
Site rights
Seabed rights held ∴
Water depth
26–29 m ◆
Distance from shore
40 km ◆
Wind speed
9.9 m/s @ 100 m ≈
Revenue & grid
Offtake
FiT ◆
Grid
Secured · 2017-12-20 ◆
Connection
DolWin2 (DolWin beta) HVDC, TenneT; offshore substation 33kV to … ◆
Schedule
FID
19 Mar 2015 ◆
COD
20 Dec 2017 ◆
Project timeline & ownership verified milestones on the spine · ownership from Hafrok’s transactions record
Acquisition · 2014-09
RWE → Northland Power 85%
- Stake
- 85%
- Consideration
- not disclosed
- Announced
- 2014-09
- Closed
- 2016-01
- Project stage
- pre-FID
Northland Power acquired 85% from RWE Innogy; RWE retained 15%. Deal bundled Nordsee Two and Nordsee Three development rights. Total construction cost ~EUR 1.2bn. Consideration undisclosed.
Evidence
- northlandpower.com ↗
- evwind.aeeolica.org — Northland Power Acquires Majority Equity Stake in North Sea Offshore Wind Power Farms From RWE Innogy | REVE News of the wind sector in Spain and in the world ↗ 2014-09 ◆ held
From Hafrok’s transactions record
Dashed tick marks today (9 Sep 2026). Ownership 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: 2017-Q4→2017-12-20 · 2 recorded revisions · held (announced 2017-Q4, unchanged)
Revenue & offtake the regime the project was built under
Offtake regime on record
RegimeEEG feed-in tariff (EEG 2012); step-down 2027; Shell PPA from June 2027 for ~1/3 output
InstrumentFiT
A built project sells its power under the contract or support regime it was financed with; it is not expected to bid into new government offtake rounds. Where the record does not yet name that regime, the row says so rather than guessing.
Installation how the build is going · from satellite counts and Hafrok’s registers
Satellite survey
the farm as it stands, counted from satellite radar images · built before the count began, so there is no build to chart
Satellite survey
Structures standing55≈54 turbines + 2 platforms expected · 1 fewer than expected — a position the survey missed
Surveyed2026-09-01≈from 118 satellite passes
Built2016 → 2017-12-20offshore construction to start of operation, from the record
Hafrok counts the structures standing in the sea from satellite radar images (≈) and reads the count against the turbines and platforms on record. The farm was built before this count began, so the images show it complete; they cannot date its construction. Rows marked with a dot (·) come from Hafrok’s own registers.
Satellite image
Image taken2026-09-07≈Copernicus Sentinel-1 radar satellite, southbound pass
Farm covered100%≈the whole farm lies inside the image
Structures ringed55 confirmed · 0 not yet confirmed≈as counted on 2026-09-01 · the image is newer than the count, so a bright spot without a ring may be a structure not yet counted
Construction ports
PortEemshaven ◆·turbine assembly and load out · quay 5000 m · crane 50 t · draft 14 m
Contains modified Copernicus Sentinel data 2026, processed by ESA and by Microsoft Planetary Computer.
Latest satellite radar image · 2026-09-07
a radar picture, not a photograph: the sea is dark, steel is bright · black is beyond the edge of the image
confirmed structure (55)seen recently, not yet confirmed (0)probably a substation platform (a larger structure than a turbine; the register above has the facts)farm boundary
Grid connection
from Hafrok’s substation, converter and cable registers
Offshore platforms · 2
Offshore substationNordsee One 155 kV offshore substation·155/33 kV · in service 2016 · owner Nordsee One GmbH (wind farm owner; farm-owned platform)
HVDC systemDolWin2·916 MW · ±320 kV · in service 2017-06 · shared with Gode Wind 1
Converter supplierHitachi Energy (contracted as ABB; ABB Power Grids sold to Hitachi 2020)·DolWin2 · Drydocks World – Dubai (construction); Aibel design and project management, outfitting/commissioning at Haugesund, Norway · for TenneT
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
16/18 fields verified · rests on 12 sources (8 primary) · ◆ 7 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.
Regulator2
[1]
Bundesamt fuer Seeschifffahrt und Hydrographie (BSH)2012-04-04◆ Genehmigungsbescheid Offshore-Windpark N…
“Auf den Antrag der Innogy Nordsee 1 GmbH (zum Zeitpunkt der Antragstellung: ENOVA Energieanlagen GmbH) [...] werden die Errichtung und der Betrieb von 54 Windenergieanlagen (WEA) einschliesslich Neben…”
supportsConsentTurbinesWater depthDistance from shoreCoordinates+1 more
[12]
Bundesnetzagentur — Marktstammdatenregister2026-08-23◆ Marktstammdatenregister (MaStR) offshore…
“Park row "Nordsee One": 54 units, 332.1 MW gross, statuses {'In Betrieb': 54}, operators ['Nordsee One GmbH'], commissioned 2017-03-30..2017-09-26, planned None..None.”
supportsRegister entry
Operator6
[3]
Northland Power Inc.2017-03-31◆ Nordsee One Offshore Wind Project Achiev…
“the first wind turbine installed on the 332 MW offshore wind farm has successfully started to generate power. Nordsee One is owned by Northland (85%) and Innogy SE (15%).”
supportsFirst power
[4]
Northland Power Inc.2017-12-21◆ Northland Power's Nordsee One Offshore W…
“Northland Power's Nordsee One offshore wind farm achieved final completion on December 20, 2017. The project was fully commissioned on schedule and below its total budget of EUR 1.2 billion. Nordsee O…”
supportsCommercial operationCOD history
[6]
Nordsee One GmbH2024◆ Nordsee One Wind Farm Technology | Advan…
“Senvion SE 6.2M126 Wind Turbine Generators. 54 turbines. Rated output: 6.15 MW per turbine. Rotor diameter: 126 meters. Total capacity: approximately 332 MW. Monopile foundations with transition piece…”
supportsTurbinesModelUnit capacityTotal capacityFoundation+2 more
[7]
Nordsee One GmbH2024
“Nordsee One GmbH is based in Oststeinbek (Germany) and is 85% owned by Northland Power Inc. and 15% owned by RWE.”
supportsBackground
[8]
Northland Power Inc.2025-11-18◆ Nordsee One Offshore Wind Farm Signs A 5…
“Nordsee One GmbH [...] Northland Power Inc. (85%) and RWE Offshore Wind GmbH (15%). The facility is currently operating under the German Renewable Energy Sources Act regime, which is scheduled to step…”
supportsMechanismDetail
[9]
Northland Power Inc.2025
“54x Senvion 6.15 MW turbines. 332 MW capacity. Completed...ahead of schedule and under budget in December 2017. Power contract with feed-in-tariff subsidy for approximately ten years under the German …”
supportsCommercial operationTurbinesUnit capacityTotal capacityMechanism+1 more
Trade press3
[2]
Offshore Energy2015-03-19◆ Nordsee One Reaches Financial Close - Of…
Press report — cited, not quoted; read it at the source link.
supportsFinal investment decisionTurbinesUnit capacityTotal capacity
[5]
Power Technology2017
Press report — cited, not quoted; read it at the source link.
supportsOnshore constructionOffshore constructionSite rightsTurbinesModel+7 more
[11]
Encyclopaedic1
[10]