Kaskasi
Located 35 km north of Heligoland in the German North Sea.
GermanyTechnology
Capacity
342 MW ◆
Turbines
38 × 9 MW ◆
Model
Siemens Gamesa SG 8-0-167 DD ◆
Foundation
Monopile ◆
Site & conditions
Site rights
Seabed rights held ∴
Origination
BNetzA Offshore Wind Auction 2018 (transitional) · 2018 ·
Water depth
22–25 m ≈
Distance from shore
35 km ◆
Wind speed
9.9 m/s @ 100 m ≈
Revenue & grid
Offtake
Merchant ◆
Grid
Secured · Jul 2022 ◆
Connection
TenneT HelWin Beta HVDC platform (HelWin2 system), 5 km array … ◆
Schedule
FID
Apr 2020 ◆
COD
Dec 2022 ◆
Project timeline & ownership verified milestones on the spine · ownership from Hafrok’s transactions record
Origination · 2018-04
BNetzA Offshore Wind Auction 2018 (transitional)
- Awarded to
- innogy (now RWE)
- Basis
- integrated tender
From the auction results — the round that created the project.
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: 2022→2022-Q4→2023-03-23→2022-12 · 4 recorded revisions · slipped +0.5 yr (first announced 2022)
Revenue & offtake the regime the project was built under
Offtake regime on record
RegimeThe farm company's accounts state that all output has been sold since commissioning under a direct-marketing contract (with Electrabel SA in the FY2024-FY2025 accounts) at the monthly offshore-wind market value. Six of the 38 turbines are recognised as pilot turbines with a guaranteed 100 EUR/MWh under § 94 WindSeeG, claimed as a market premium from TenneT; the rest of the output has no support. RWE Supply & Trading has sold Kaskasi power to seven industrial customers under contracts starting 2026-2028 (RWE, February 2024); the farm company's accounts to FY2025 do not mention them.
InstrumentMerchant
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 since2022-12
Offshore construction2022-03 → 2022-12
Construction ports
PortBuss Terminal Eemshaven ◆·marshalling · quay 5000 m · crane 50 t · draft 14 m
Grid connection
from Hafrok’s substation, converter and cable registers
Offshore platforms · 2
Offshore substationKaskasi offshore substation·in service 2022 · owner RWE (wind farm owner; farm-owned platform)
HVDC systemHelWin2·690 MW · ±320 kV · in service 2015-06 · shared with Amrumbank West
Converter supplierSiemens·HelWin2 · Heerema, Zwijndrecht, Netherlands · 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 17 sources (18 primary) · ◆ 10 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
[18]
Bundesnetzagentur — Marktstammdatenregister2026-08-23◆ Marktstammdatenregister (MaStR) offshore…
“Park row "OWP Kaskasi": 38 units, 342.0 MW gross, statuses {'In Betrieb': 38}, operators ['RWE Kaskasi GmbH'], commissioned 2022-07-31..2022-12-15, planned None..None.”
supportsCommercial operation
[22]
Bundesamt für Seeschifffahrt und Hydrographie (BSH)2020-12◆ Planfeststellungsbeschluss Offshore-Wind…
“Mit Schreiben vom 24. September 2006, beim BSH eingegangen am 25. September 2006, stellte die Hochsee Testfeld Helgoland GmbH einen Antrag auf Genehmigung der Err ichtung und des Betriebes des OWP „Ho…”
supportsConsentConsent appliedConsent granted
Operator11
[1]
RWE AG2020-12-18◆ RWE receives planning permission for Kas…
“Beginning of December, the German Federal Maritime and Hydrographic Agency (BSH) granted planning permission for the 342-megawatt wind farm. [...] After full start of commercial operation in Q4 2022, …”
supportsConsentTurbinesModelUnit capacityTotal capacity+4 more
[2]
Offshore Wind Biz2020-04-03
Press report — cited, not quoted; read it at the source link.
supportsFinal investment decision
[3]
RWE AG2022-08-01◆ Power on: First turbine commissioned at …
“35 kilometres north of the island of Heligoland, the first turbine of RWE's Kaskasi offshore wind farm was recently commissioned, and is now supplying green electricity to the grid. Nine of the in tot…”
supportsoperatorFirst powerTurbinesModelUnit capacity+1 more
[5]
RWE AG2023-03-23◆ Kaskasi: RWE offshore wind farm commence…
“Today, the RWE wind farm Kaskasi, located around 35 kilometres north of the island of Heligoland, officially commenced regular operation in the presence of Robert Habeck, German Federal Minister for E…”
supportsCommercial operationTurbinesTotal capacityDistance from shore
[6]
RWE AG2022-06-08◆ World’s first: Innovative steel collars …
“For the first time ever in the renewables industry special collars were installed around the monopile foundation at seabed level. [...] The installation in water depths of up to 25 metres was carried …”
supportsFoundation
[7]
RWE AG2021-09-07◆ RWE tests world’s first recyclable wind …
“Siemens Gamesa and RWE are committed to installing a select number of wind turbines with recyclable blades off the coast of Heligoland. [...] At its 342 megawatt wind farm Kaskasi the company will ins…”
supportsBackground
[10]
Offshore Wind Biz2022-07-14
Press report — cited, not quoted; read it at the source link.
supportsStatusConnection point
[11]
Buss Group2022
“After the successful tender in December 2021, Buss is responsible for handling, storage and terminal logistics of the 38 monopiles and transition pieces on its own terminal site. [...] A total of arou…”
supportsmarshalling
[13]
RWE AG2025◆ Offshore wind farm Kaskasi | RWE
“Technological research in RWE's sixth wind farm off the German coast [...] Kaskasi consists of 38 turbines (Siemens Gamesa 9MW) and has an installed capacity of 342MW. Located 35 km off the coast of H…”
supportsBackground
[20]
Unternehmensregister2026-08-06◆ RWE Kaskasi GmbH, Hamburg - Jahresabschl…
“Die Gesellschaft ist im Handelsregister B des Amtsgerichts Hamburg unter HRB 119339 eingetragen. ... "Sechs Anlagen des Offshore-Windparks sind von der Bundesnetzagentur als Pilot-Anlagen anerkannt un…”
supportsMechanismDetail
[21]
Unternehmensregister2025-02-04◆ RWE Kaskasi GmbH, Hamburg - Jahresabschl…
“Die Gesellschaft ist im Handelsregister B des Amtsgerichts Hamburg unter HRB 119339 eingetragen. ... "Der gesamte produzierte Strom wird seit Inbetriebnahme über einen Direktvermarktungsvertrag in der…”
supportsCommercial operationCOD historyMechanismDetail
Trade press3
[15]
[16]
Offshore Wind Biz2022-03-11
Press report — cited, not quoted; read it at the source link.
supportsOffshore construction
[17]
Encyclopaedic1
[14]