Westermost Rough
Located 8km NE of Withernsea off Holderness coast, Yorkshire. Pioneered Siemens 6MW offshore turbine.
Status
Operationallifecycle stage
Ownership
Ørsted — 50% ◆AIArjun Infrastructure Partners — 25% ◆
Equitix — 12.5% ◆USUniversities Superannuation Scheme — 9.37% ◆
STStepStone Group — 3.13% ◆
Location
United KingdomNorth Sea
Technology
Capacity
210 MW ◆
Turbines
35 × 6 MW ◆
Model
Siemens Swt 6-0-154 ◆
Foundation
Monopile ◆
Site & conditions
Site rights
Seabed rights held ∴
Origination
Crown Estate Round 2 · 2003 ·
Water depth
15–15 m ◆
Distance from shore
8 km ◆
Wind speed
9.5 m/s @ 100 m ≈
Revenue & grid
Offtake
Other ◆
Grid
Secured · 2015 ◆
Connection
Hedon substation, Yorkshire (275kV) ◆
Schedule
FID
Jan 2013 ◆
COD
Jul 2015 ◆
Project timeline & ownership verified milestones on the spine · ownership from Hafrok's transactions record
6 dated milestones on the spine, each with its source · 7 recorded ownership deals from Hafrok's transactions record · the developer's announced-COD history
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Revenue & offtake contract terms, price levels and the route to market
the contract terms on record · price over time in money of the day · the routes to market and the next visible round
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Installation how the build is going · from sourced statements and Hafrok's registers
construction status and turbines standing · vessel and port contracts · the grid connection and whether it is ready in time
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Sources & verification
Rests on 15 sources (15 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.
Regulator1
[19]
Department for Energy Security and Net Zero2026-05-06◆ Renewable Energy Planning Database (REPD…
“REPD Q1 2026 quarterly extract — Ref ID 2545: Site Name "Westermost Rough A", Development Status "Operational", Installed Capacity 210 MWelec, Operator "Orsted (formerly Dong Energy)"”
supportsRegister entry
Operator6
[1]
Ørsted A/S (then DONG Energy)2014-08-14◆ First 6MW turbine erected at DONG Energy…
“The first of 35 Siemens 6MW turbines has been successfully erected at the Westermost Rough offshore wind farm, a joint venture between DONG Energy (50%) and its partners Marubeni Corporation (25%) and…”
supportsTurbinesModelUnit capacityTotal capacityconstruction management
[2]
Ørsted A/S (then DONG Energy)2014-09-08◆ First power at DONG Energys Westermost R…
“2014-09-08T06:17:00.0000000Z — Electricity has been generated for the first time at Westermost Rough Offshore wind farm off the UK's East Coast, a joint venture between DONG Energy (50%) and its partn…”
supportsFirst power
[4]
Ørsted A/S (then DONG Energy)2015-05-26◆ Full power at Westermost Rough offshore …
“2015-05-26T09:00:00.0000000Z — Full power output has been achieved at the Westermost Rough offshore wind, a major renewable energy project located off the UK's east coast. Westermost Rough is located …”
supportsCommercial operationDistance from shoreCoordinates
[5]
Ørsted A/S (then DONG Energy)2015-07-01◆ Ground breaking Westermost Rough offshor…
"2015-07-01T10:30:00.0000000Z — Westermost Rough – the first offshore wind farm in the world to make commercial use of giant Siemens 6MW turbines with 75 metre blades – has been officially opened at a…
supportsCommercial operationCOD historyFoundationStatusConnection point+1 more
[7]
Ørsted A/S (then DONG Energy)2017-03-21◆ Good Energy sources wind power from DONG…
“The deal secures 12% of the output of the 210MW Westermost Rough Offshore Wind Farm operated by DONG Energy in the North Sea, enough renewable electricity to power more than 26,000 average homes. West…”
supportsMechanismDetail
[20]
National Energy System Operator (NESO)2026-07-21◆ NESO Transmission Entry Capacity (TEC) R…
“NESO TEC Register, edition 21 July 2026 - PRO-000223: "Westermost Rough Offshore Wind Farm", Status "Built", MW Connected 206.5, Effective From n/a, Customer "WESTERMOST ROUGH LIMITED"”
supportsRegister entry
Trade press8
[9]
Ørsted A/S (then DONG Energy) via GlobeNewswire2013-01-30
“DONG Energy has decided to build the offshore wind farm Westermost Rough in the North Sea on the British east coast. Offshore construction of the Westermost Rough offshore wind farm will begin in firs…”
supportsFinal investment decision
[10]
[14]
[15]
Transmission Investment
“The assets connect the 210MW Westermost Rough offshore windfarm to the 275kV electricity transmission network at Hedon substation in Yorkshire.”
supportsStatusConnection point
[16]
Power Technology2025
Press report — cited, not quoted; read it at the source link.
supportsoperatorinvestor
[17]
Power Technology (GlobalData)2015-07-23
Press report — cited, not quoted; read it at the source link.
supportsConsentConsent granted
[18]
[21]
Ørsted2025-Q2◆ Orsted — orsted factsheet asset book q2 …
“Westermost Rough (35 x SWT-6.0-154) | Arjun Infrastructure, USS, Equitix, Macquaire | 210 | 210 | 105 | Pro rata | 0.5 | 0.5 | 2015 | ROC | 2035 | - | 2”
supportsMechanismDetail
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