Nordsee Ost
Located 30km north of Helgoland, 60km from shore.
GermanyTechnology
Capacity
295 MW ◆
Turbines
48 × 6.15 MW ◆
Foundation
Jacket ◆
Site & conditions
Site rights
Seabed rights held ∴
Water depth
22–25 m ◆
Distance from shore
60 km ◆
Wind speed
9.9 m/s @ 100 m ≈
Revenue & grid
Offtake
Premium ◆
Grid
Secured · 2015 ◇
Connection
TenneT HelWin1 HVDC (+/-250 kV, 130 km total: 85 km sea + 45 km … ◇
Schedule
FID
Taken · date not recorded ∴
COD
Aug 2015 ◆
Project timeline verified milestones only — each date carries its provenance mark
Dashed tick marks today (13 Oct 2026).
Announced-COD history: 2015-Q2→2015-05→2015-08 · 3 recorded revisions · held within the year (first announced 2015-Q2, latest 2015-08)
Revenue & offtake the regime the project was built under
Offtake regime on record
RegimeThe farm company's accounts (FY2017-FY2025) state that it sells its power by direct marketing and receives the EEG market premium, under the compressed model: an applicable value of 19.4 ct/kWh in the first years, falling for some turbines to 15.4 ct/kWh during 2022 and successively to the 3.9 ct/kWh base from August 2023, the last turbine in November 2024. From August 2023 turbines moved successively to other direct marketing (market price, no premium) through RWE Supply & Trading, no premium was received in 2025, and a contract sells 8.33% of output outside the premium model from 1 Jan 2024 to 31 Dec 2028.
Instrumentmarket premium
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 sourced statements and Hafrok’s registers
Installation complete
Installation · on record
StageOperational
In operation since2015-08
Offshore construction2013 → 2015-08
Construction ports
PortBremerhaven ◆·construction base · quay 4930 m · draft 12.8 m
Grid connection
from Hafrok’s substation, converter and cable registers
Offshore platforms · 2
Offshore substationNordsee Ost offshore substation·33/155 kV · in service 2015 · owner RWE (wind farm owner) — farm-owned AC platform, not TSO-owned
HVDC systemHelWin1·576 MW · ±250 kV · in service 2015-02 · shared with Meerwind Süd/Ost
Converter supplierSiemens·HelWin1 · Nordic Yards, Wismar · 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
Rests on 13 sources (11 primary) · ◆ 8 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 für Seeschifffahrt und Hydrographie (BSH)2004-06◆ Genehmigungsbescheid Offshore-Windpark N…
“Eckkoordinaten (WGS 84) des Gebietes, in dem die Anlagen errichtet werden, lauten: Koordinate i 54° 28’15” N 7°38’26” E Koordinate j 54° 28’'19” N 7°44' 21" E Koordinate j‘ 54° 27’ 40” N 7° 44 23" E K…”
supportsConsentCoordinatesConsent granted
[11]
Bundesnetzagentur — Marktstammdatenregister2026-08-23◆ Marktstammdatenregister (MaStR) offshore…
“Park row "OWP Nordsee Ost 1": 24 units, 147.6 MW gross, statuses {'In Betrieb': 24}, operators ['Windpark Nordsee Ost GmbH'], commissioned 2015-02-13..2015-08-15, planned None..None. Park row "OWP Nor…”
supportsRegister entry
Operator7
[2]
RWE AG2024◆ Nordsee Ost offshore wind farm | RWE ope…
“Nordsee Ost offshore wind farm, operated by RWE, is located approximately 30 kilometres north of the island of Heligoland. Its 48 wind turbines generate sufficient climate-friendly electricity to supp…”
supportsCommercial operationTurbinesUnit capacity
[3]
RWE AG2023-01-16◆ Green electricity from Nordsee Ost and A…
“From 2025 and 2026 respectively, RWE’s Nordsee Ost and Amrumbank West offshore wind farms will supply eleven German industrial customers and one large municipal utility with green electricity. [...] B…”
supportsMechanismDetail
[5]
Stainless Steel World (RWE press release republication)2015-05-13
“With an installed capacity of 295MW, Nordsee Ost is one of the largest wind farms off the German coast. It is located about 35km north of Heligoland and covers approx. 24km2, with water depths of up t…”
supportsFirst powerWater depthDistance from shoreconstruction base
[9]
RWE AG2023-03-23◆ Kaskasi: RWE offshore wind farm commence…
“After Nordsee Ost (295 MW) and Amrumbank West (302 MW), Kaskasi is the third RWE wind farm that will be operated and maintained from the company’s service station on Heligoland.”
supportsoperatorTotal capacity
[13]
Unternehmensregister2020-11-02◆ Windpark Nordsee Ost GmbH, Helgoland - J…
“Der Standort des Windparks liegt rund 60 km vom Festland und 30 km von der Insel Helgoland entfernt. [...] Die installierte Gesamtleistung des Windparks beträgt 295 MW und verteilt sich auf 48 Senvion…”
supportsCommercial operationCOD historyMechanismDetail
[15]
Unternehmensregister2025-02-04◆ Windpark Nordsee Ost GmbH, Helgoland - J…
“Der erzeugte Strom muss daher direkt vermarktet werden. Für den vermarkteten Strom wird eine Marktprämie gewährt, die kalendermonatlich berechnet wird. Da sich die Gesellschaft für das sogenannte Stau…”
supportsMechanismDetail
[16]
Unternehmensregister2026-08-06◆ Windpark Nordsee Ost GmbH, Helgoland - J…
“Im November 2024 fiel auch für die letzte Windenergieanlage im Windpark Nordsee Ost die gesetzlich garantierte Vergütung auf 39 €/MWh. Da bei den aktuellen Marktpreisen ab 2025 keine Marktprämienanspr…”
supportsMechanismDetail
Trade press3
[4]
GlobalData / Power Technology2015
Press report — cited, not quoted; read it at the source link.
supportsFinal investment decisionOnshore constructionOffshore constructionFirst powerSite rights+3 more
[6]
NS Energy Business2015
Press report — cited, not quoted; read it at the source link.
supportsTurbinesUnit capacityTotal capacityWater depthDistance from shore+1 more
[10]
Encyclopaedic1
[7]
Wikipedia2026
"DC voltage of +/-250 kV and a transmission capacity of 576 MW." ... "Each of the two 250 kV cables linking HelWin Alpha to the onshore substation has a total length of 130 km, of which 85 km is sea c…
supportsStatusConnection point