Gwynt y Mor
Located off North Wales coast in Liverpool Bay. Name means 'Wind of the Sea' in Welsh.
Status
Operationallifecycle stage
Ownership
Location
United KingdomIrish Sea
Technology
Capacity
576 MW ◆
Turbines
160 × 3.6 MW ◆
Model
Siemens Swt 3-6-107 ◆
Foundation
Monopile ◆
Site & conditions
Site rights
Seabed rights held ∴
Origination
Crown Estate Round 2 · 2003 ·
Water depth
12–28 m ◆
Distance from shore
17 km ◆
Wind speed
9.3 m/s @ 100 m ≈
Revenue & grid
Offtake
Certificate ∅
Grid
Secured · 2015 ◆
Connection
400kV onshore substation at St. Asaph, Denbighshire ◆
Schedule
FID
Jun 2010 ◆
COD
2015-Q2 ◆
Project timeline & ownership verified milestones on the spine · ownership from Hafrok’s transactions record
Origination · 2003-12
Crown Estate Round 2
- Awarded to
- RWE
- Basis
- seabed award
From the auction results — the round that created the project.
Farmdown · 2014-03
RWE → UK Green Investment Bank 10%
- Stake
- 10%
- Consideration
- €228m
- Implied 100% value
- €2,276m
- Implied
- €3.95m / MW
- Basis
- Price for the equity
- Announced
- 2014-03
- Closed
- 2015-10
- Project stage
- under construction
RWE Innogy agreed in March 2014 to sell a 10% share of Gwynt y Môr, an unincorporated joint venture, to the UK Green Investment Bank; GIB put the purchase price at GBP 220m, to be paid once construction was complete. RWE funded the build. Its company holding the 10% sold that share of the export cables to the OFTO on 17 February 2015, and on 30 October 2015, with the farm finished, GIB's Offshore Wind Fund bought the company for GBP 189.3m in cash (shares and shareholder loan), per its audited accounts. The stake passed to Macquarie with GIB in 2017. After the deal: RWE 50%, Stadtwerke München 30%, Siemens 10%, GIB 10%. EUR figure at the ECB 2014-03 monthly average.
Evidence
- Offshore Wind Biz — RWE Sells 10 Pct of Gwynt-y-Mor to UK Green Investment Bank ↗ 2014-03-31 ◆ held
- Companies House — Gwynt Y Mor Offshore Wind Farm Limited - full accounts to 31 December 2013 ↗ 2014-09-24 ◆ held
- Ofgem — Offshore Transmission: Cost Assessment for the Gwynt y Mor transmission assets ↗ 2015-02 ◆ held
- Companies House — GIB Offshore Wind Fund GYM buyer (09672892) - accounts to 31 March 2016 ↗ ◆ held
- Companies House — UK Green Investment GYM Participant Ltd (07233484) - accounts to 31 December 2015 ↗ ◆ held
- UK Green Investment Bank plc — UK Green Investment Bank - Annual Report and Accounts 2013-14 ↗ 2014-06 ◆ held
From Hafrok’s transactions record
Secondary trade · 2019-10
Siemens AG → Macquarie 10%
- Stake
- 10%
- Consideration
- not disclosed
- Announced
- 2019-10
- Project stage
- operational
Macquarie Infrastructure and Real Assets (MIRA) acquired Siemens AG's 10% stake in Gwynt y Mor for an undisclosed sum, doubling MIRA's holding from 10% (originally GIB stake) to 20%. After the deal: RWE 50%, Stadtwerke München 30%, Macquarie 20%. Industrial equity holder exit.
Evidence
From Hafrok’s transactions record
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: 2015-Q2→2015-Q2 · 2 recorded revisions · held (announced 2015-Q2, unchanged)
Revenue & offtake the regime the project was built under
Offtake regime on record
RegimeROC (offshore wind, 2 ROCs/MWh — rate to be confirmed against primary source)
Instrumentgreen certificates
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-Q2
Offshore construction2012-04 → 2015-Q2
Construction ports
PortPort of Mostyn ◆O&M base
Grid connection
from Hafrok’s substation, converter and cable registers
Offshore platforms · 1
Offshore substationGwynt y Mor offshore substations (2, described collectively)·33/132 kV · owner Gwynt y Mor OFTO (see notes); built by RWE-led Gwynt y Mor Offshore Wind Farm Ltd
Sources & verification
Rests on 10 sources (7 primary) · ◆ 7 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.
Regulator3
[2]
Ofgem2010-11◆ Gwynt y Mor Offshore Transmission Assets…
“All necessary offshore consents and licences are in place for the construction of the Transmission Assets. These include Electricity Act (1989) Section 36 and Coastal Protection Act (1949) consents an…”
supportsOnshore constructionOffshore constructionStatusConnection point
[4]
Ofgem2015-02-12◆ Ofgem grants licence for £352 million Gw…
“The offshore wind farm comprises 160 Siemens 3.6MW turbines with a maximum installed capacity of 576MW, positioned approximately 8 miles off the North Wales coast in Liverpool Bay.”
supportsModel
[11]
Department for Energy Security and Net Zero2026-05-06◆ Renewable Energy Planning Database (REPD…
“REPD Q1 2026 quarterly extract — Ref ID 2543: Site Name "Gwynt y Mor", Development Status "Operational", Installed Capacity 576 MWelec, Operator "RWE"”
supportsRegister entry
Operator4
[1]
RWE AG2025-07-07◆ Wales’s largest Offshore Wind Farm, Gwyn…
“At 576 megawatts (MW) installed capacity, Gwynt y Môr is currently the largest operating renewable energy project in Wales and, at the time of its inauguration in June 2015, was the second largest off…”
supportsCommercial operationCOD historyTurbinesUnit capacityTotal capacity+1 more
[3]
RWE (UK)2025◆ Gwynt y Môr offshore wind farm
“Gwynt y Môr Offshore Wind Farm Limited is an Unincorporated Joint Venture between RWE (50% shareholder), Stadtwerke München GmbH (30% shareholder) and Macquarie GIG (20% shareholder). [...] Commission…”
supportsDistance from shoreCoordinates
[8]
[12]
National Energy System Operator (NESO)2026-07-21◆ NESO Transmission Entry Capacity (TEC) R…
“NESO TEC Register, edition 21 July 2026 - PRO-000208: "Gwynt Y Mor Offshore Wind Farm", Status "Built", MW Connected 574, Effective From n/a, Customer "GWYNT Y MOR OFFSHORE WIND FARM LIMITED"”
supportsRegister entry
OEM1
[9]
Siemens2010-06-04
“RWE Innogy, Stadtwerke München and Siemens have entered into a joint venture to build the offshore wind farm Gwynt y Môr (Welsh for 'wind in the sea'). ... The total investment amounts to more than tw…”
supportsFinal investment decision
Trade press2
[5]
Power Technology2015
Press report — cited, not quoted; read it at the source link.
supportsConsentFirst powerModelFoundationWater depth+1 more
[10]