Sandbank
Located 90km west of Sylt. Companion farm to DanTysk. JV Vattenfall/SWM.
Status
Operationallifecycle stage
Ownership
Vattenfall — 51% ◆
Stadtwerke München — 49% ◆Location
GermanyNorth Sea
Technology
Capacity
288 MW ◆
Turbines
72 × 4 MW ◆
Model
Siemens Swt 4-0-130 ◆
Foundation
Monopile ◆
Site & conditions
Site rights
Seabed rights held ∴
Water depth
24–40 m ◆
Distance from shore
90 km ◆
Wind speed
10.1 m/s @ 100 m ≈
Revenue & grid
Offtake
Other ◆
Grid
Secured · 2017-01 ◆
Connection
TenneT SylWin1 HVDC, ±320kV DC, 155kV AC export ◆
Schedule
FID
Aug 2014 ◆
COD
25 Jan 2017 ◆
Project timeline & ownership verified milestones on the spine · ownership from Hafrok’s transactions record
JV entry · 2014-08
Vattenfall → Stadtwerke München 49%
- Stake
- 49%
- Consideration
- not disclosed
- Announced
- 2014-08
- Project stage
- FID
Vattenfall and SWM jointly took FID in August 2014, again on 51/49 basis mirroring DanTysk. Investment ~EUR 1.2bn. Consideration undisclosed.
Evidence
- group.vattenfall.com ↗
- offshoreWIND.biz — Stadtwerke München Looks to Acquire Sandbank OWF ↗ 2014-08 ◆ 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-Q1→2017-01-25 · 2 recorded revisions · held (announced 2017-Q1, unchanged)
Revenue & offtake the regime the project was built under
Offtake regime on record
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 standing73≈72 turbines + 2 platforms expected · 1 fewer than expected — a position the survey missed
Surveyed2026-08-31≈from 95 satellite passes
Built2015-07 → 2017-01-25offshore 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 taken2026-09-06≈Copernicus Sentinel-1 radar satellite, southbound pass · 2 newer passes skipped because the satellite’s track only caught part of the farm (the best of them 0%)
Farm covered100%≈the whole farm lies inside the image
Structures ringed73 confirmed · 0 not yet confirmed≈as counted on 2026-08-31 · the image is newer than the count, so a bright spot without a ring may be a structure not yet counted
Construction ports
PortEsbjerg ◆·installation · quay 10000 m · crane 300 t · draft 15 m
Contains modified Copernicus Sentinel data 2026, processed by ESA and by Microsoft Planetary Computer.
Latest satellite radar image · 2026-09-06
a radar picture, not a photograph: the sea is dark, steel is bright · black is beyond the edge of the image
confirmed structure (73)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 substationUmspannplattform Sandbank·33/155 kV · in service 2016 · owner Vattenfall / Stadtwerke Muenchen (wind farm owners) — farm-owned, not TSO-owned
HVDC systemSylWin1·864 MW · ±320 kV · in service 2015-04 · shared with Butendiek, DanTysk
Converter supplierSiemens·SylWin1 · Nordic Yards (Warnowwerft, Rostock) · 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
17/18 fields verified · rests on 11 sources (7 primary) · ◆ 9 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)2004-08-23◆ Genehmigungsbescheid Offshore-Windpark S…
“Hamburg, den 23.08.2004 … Genehmigungsbescheid … werden Errichtung und Betrieb von 80 einzelnen Windenergieanlagen (WEA) einschließlich Nebenanlagen genehmigt. … Dieser liegt ca. 90 km westlich Sylt. …”
supportsConsentWater depthDistance from shoreCoordinatesConsent granted
[11]
Bundesnetzagentur — Marktstammdatenregister2026-08-23◆ Marktstammdatenregister (MaStR) offshore…
“Park row "OWP Sandbank": 72 units, 302.4 MW gross, statuses {'In Betrieb': 72}, operators ['DanTysk Sandbank Offshore Wind GmbH ＆ Co.KG'], commissioned 2016-09-06..2017-01-25, planned None..None.”
supportsRegister entry
Operator5
[2]
Offshore Wind Biz2014-08-11◆ Vattenfall, Stadtwerke München Decide to…
Press report — cited, not quoted; read it at the source link.
supportsFinal investment decision
[3]
Offshore Wind Biz2015-07-08◆ Sandbank OWF Construction Kicks Off | Of…
Press report — cited, not quoted; read it at the source link.
supportsOffshore constructionSite rights
[4]
Vattenfall AB2016-09-09◆ Correction: Sandbank Offshore Wind Farm …
“The offshore wind power plant Sandbank, located 90 kilometers west of the island of Sylt, has now supplied the German electricity network with its first wind power from the North Sea. The first of a t…”
supportsFirst power
[5]
Vattenfall AB2017-01-27◆ Sandbank offshore wind farm commissioned…
“On 25. January, the offshore wind farm Sandbank started to deliver power to the grid. … Sandbank, located 90 kilometers west of the island of Sylt, is accordingly fully commissioned. … Vattenfall hold…”
supportsoperatorinvestorCommercial operationCOD historyTurbines+2 more
[6]
Vattenfall AB2017-07-24◆ Offshore wind farm Sandbank now official…
“The offshore wind farm Sandbank with an installed capacity of 288 megawatt (MW) is now officially inaugurated. … The construction start of Sandbank on the high seas took place in summer 2015. … Vatten…”
supportsCommercial operation
Trade press4
[7]
Power Technology (GlobalData)2017◆ Sandbank Offshore Windfarm, North Sea
Press report — cited, not quoted; read it at the source link.
supportsModelUnit capacityFoundationStatusConnection point
[8]
Offshore Wind Biz2015-02-23◆ WINDFARM UPDATES: Sandbank & Wikinger | …
Press report — cited, not quoted; read it at the source link.
supportsFoundationinstallation
[9]
Noerr LLP2014
“Das optionale Stauchungsmodell, nach dem in den ersten acht Jahren nach Inbetriebnahme eine höhere Anfangsvergütung gezahlt wird … § 50 Abs. 1–3 EEG 2014 … 19,40 ct/kWh … für Anlagen, die bis Ende 201…”
supportsMechanismDetail
[10]