Nordsee Ost
Located 30km north of Helgoland, 60km from shore.
GermanyTechnology
Capacity
295 MW ◆
Turbines
48 × 6.15 MW ◆
Model
Senvion 6 2m126 ◆
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
FiT ◆
Grid
Secured · 2015 ◇
Connection
TenneT HelWin1 HVDC (+/-250 kV, 130 km total: 85 km sea + 45 km … ◇
Schedule
FID
Taken · date not recorded ∴
COD
May 2015 ◆
Project timeline verified milestones only — each date carries its provenance mark
Dashed tick marks today (9 Sep 2026).
Announced-COD history: 2015-Q2→2015-05 · 2 recorded revisions · held (announced 2015-Q2, unchanged)
Revenue & offtake the regime the project was built under
Offtake regime on record
RegimeEEG 2012 feed-in tariff (15 ct/kWh initial 12 years; expired ~2024; PPAs from 2025)
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 standing49≈48 turbines + 2 platforms expected · 1 fewer than expected — a position the survey missed
Surveyed2026-09-01≈from 117 satellite passes
Built2013 → 2015-05offshore 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 ringed49 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
PortBremerhaven ◆·construction base · quay 4930 m · draft 12.8 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 (49)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 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
16/18 fields verified · rests on 11 sources (6 primary) · ◆ 5 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…
supportsConsentConsent 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
Operator4
[2]
RWE AG2024◆ Nordsee Ost offshore wind farm | RWE ope…
"48 wind turbines" with "x 6.15 MW, supplied by Senvion" ... "located approximately 30 kilometres north of the island of Heligoland" ... "Status: In operation"
supportsCommercial operationTurbinesModelUnit capacityTotal capacity+1 more
[3]
RWE AG2023-01-16◆ Green electricity from Nordsee Ost and A…
"The Nordsee Ost wind farm has a total of 48 wind turbines with a total installed capacity of 295 megawatts." "producing electricity since 2015" "currently receive funding under the Renewables Act (EE…
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 powerCommercial operationCOD historyWater depthDistance from shore+1 more
[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 from the service station at Helgoland.”
supportsoperatorTotal capacity
Trade press4
[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
[8]
International Energy Agency (IEA)2012
"the initial tariff remains at EUR Cent 15/kWh" ... "(standard model: EUR cent 15/kWh for 12 years)"
supportsMechanismDetail
[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