Hornsea One

Located 120km off Yorkshire coast. O&M from East Coast Hub, Grimsby.

Status
Operationallifecycle stage
Ownership
Ørsted — 37.55% 
Equitix — 14.85% 
Brookfield — 12.45% 
Greencoat UK Wind — 10.55% 
TRIG — 10.15% 
GIGLIL Infrastructure — 6.25% 
OGOctopus Energy Generation — 6.25% 
SGSchroders Greencoat — 1.95% 
Location
United Kingdom
North Sea
Technology
Capacity 1,218 MW  Turbines 174 × 7 MW  Model Siemens Swt 7-0-154  Foundation Monopile 
Site & conditions
Site rights Seabed rights held 
Origination Crown Estate Round 3 · 2010 ·
Water depth 20–40 m  Distance from shore 120 km  Wind speed 10.0 m/s @ 100 m 
Revenue & grid
Offtake CfD · FIDeR  Grid Connected  Connection Grid connection secured. Landfall at Horseshoe Point. Onshore … 
Schedule
FID 2016  COD Dec 2019 

Project timeline & ownership verified milestones on the spine · ownership from Hafrok’s transactions record

2010’11’12’13’14’15’16’17’18’19’20’21’22’23’24’25’26Crown Estate Round 3 — awarded to SMart Wind (Mainstream Renewable Power + Siemens Project Ventures)Crown Estate Round 3 Jan 2010 · auction recordView the source for Final investment decisionFinal investment decision 2016 View the sources for Onshore constructionOnshore construction 2016 View the sources for Offshore constructionOffshore construction Jan 2018 View the source for First powerFirst power 2019-Q1 View the sources for Commercial operationCommercial operation Dec 2019 Crown Estate Round 3 — awarded to SMart Wind (Mainstream Renewable Power + Siemens Project Ventures) 2010-01 ORIGINATIONSMart Wind → Ørsted — 33.34% 2011-12 JV ENTRYSMart Wind → Ørsted — 66.66% · closed 2015-02 2015-02-04 ACQUISITIONØrsted → GIP — 50% · closed 2018-11 2018-09 FARMDOWNGIP → TRIG / Equitix — 12.5% · closed 2022-06 2022-03 GIP → Greencoat — 12.5% · €472m · closed 2022-08 2022-05 GIP → TRIG / Equitix — 12.5% · closed 2022-09 2022-07 GIP → Octopus Energy Generation / GLIL Infrastructure — 12.5% · €472m · closed 2022-10 2022-08 Ørsted → Brookfield — 12.45% · closed 2024-12 2024-10 PORTFOLIOGreencoat UK Wind → Schroders Greencoat (managed funds) — 1.95% · closed 2025-Q3 2025-07-30 TODAYSMart Wind (Mainstream Renewable Power + Siemens Project Ventures) SMart Wind SMart Wind exited 2015-02-04Ørsted — 37.55% today · operator Ørsted Ørsted 37.55%GIP GIP GIP exited 2022-08TRIG — 10.15% today · financial TRIG TRIG 10.15%Equitix — 14.85% today · financial Equitix Equitix 14.85%Greencoat UK Wind — 10.55% today · financial Greencoat Greencoat 10.55%Octopus Energy Generation — 6.25% today · financial Octopus Energy Generati… Octopus Energy Generati… 6.25%GLIL Infrastructure — 6.25% today · financial GLIL Infrastructure GLIL Infrastructure 6.25%Brookfield — 12.45% today · financial Brookfield Brookfield 12.45%Schroders Greencoat — 1.95% today · financial Schroders Greencoat Schroders Greencoat 1.95%Crown Estate Round 3 — awarded to SMart Wind (Mainstream Renewable Power + Siemens Project Ventures) SMart Wind → Ørsted — 33.34% 33.34%SMart Wind → Ørsted — 66.66% · closed 2015-02 66.66%Ørsted → GIP — 50% · closed 2018-11 50%GIP → TRIG / Equitix — 12.5% · closed 2022-06 GIP → TRIG / Equitix — 12.5% · closed 2022-06 12.5% → consortiumGIP → Greencoat — 12.5% · €472m · closed 2022-08 12.5%GIP → TRIG / Equitix — 12.5% · closed 2022-09 GIP → TRIG / Equitix — 12.5% · closed 2022-09 12.5% → consortiumGIP → Octopus Energy Generation / GLIL Infrastructure — 12.5% · €472m · closed 2022-10 GIP → Octopus Energy Generation / GLIL Infrastructure — 12.5% · €472m · closed 2022-10 12.5% → consortiumØrsted → Brookfield — 12.45% · closed 2024-12 12.45%Greencoat UK Wind → Schroders Greencoat (managed funds) — 1.95% · closed 2025-Q3 1.95%
Dashed tick marks today (9 Sep 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: 202020202019-12 · 3 recorded revisions · pulled forward -0.5 yr (first announced 2020)

Revenue & offtake contract duration and price levels · money of the day

1,200 MW contracted — investment contract
Investment contract · FID Enabling for Renewables (FIDeR) investment contracts
Price£140/MWh ·
Basis2012 real · CPI-indexed
Capacity1,200 MWAwardedApr 2014
Term15 yrs · delivery 2018/19
Money-of-the-day values computed by Hafrok from the United Kingdom CPI index, 2012 real base — actual to 2026-07, then an assumed +2.0%/yr (central-bank target). Investment contract terms run 15 years from start of generation in the contracted delivery year.
Contract price over time · £/MWh
solid = actual CPI indexation · dashed = assumed +2.0%/yr
Investment contract · FID Enabling for Renewables (FIDeR) investment contracts
50100150200250nowInvestment contract · FID Enabling for Renewables (FIDeR) investment contracts — £140/MWh · 2012 real · CPI-indexedInvestment contract · FID Enabling for Renewables (FIDeR) investment contracts — £140/MWh · 2012 real · CPI-indexed · assumed indexationInvestment contract · FID Enabling for Renewables (FIDeR) …2014201720202023202620292032Investment contract · FID Enabling for Renewables (FIDeR) investment contracts — £140/MWh · 2012 real · CPI-indexed — 145.7 at award206.3 now

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 standing174174 turbines + 2 platforms expected · 2 fewer than expected — a position the survey missed
Surveyed2026-09-01from 114 satellite passes
Built2018-01 → 2019-12offshore 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 taken2026-09-07Copernicus Sentinel-1 radar satellite, northbound pass
Farm covered100%the whole farm lies inside the image
Structures ringed174 confirmed · 0 not yet confirmedas 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
PortPort of Grimsby O&M base (East Coast Hub)
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 (174)seen recently, not yet confirmed (0)probably a substation platform (a larger structure than a turbine; the register above has the facts)farm boundary
Satellite radar image over Hornsea One, 2026-09-07
Grid connection
from Hafrok’s substation, converter and cable registers
Offshore platforms · 2
Offshore substationHornsea One offshore substations (3, described collectively)·owner Diamond Transmission Partners Hornsea One (OFTO); built by Ørsted
Offshore substationHornsea One Reactive Compensation Station·owner Diamond Transmission Partners Hornsea One (OFTO); built by Ørsted

Sources & verification

17/18 fields verified · rests on 18 sources (17 primary) · ◆ 13 documents held
VerifiedModelledSourcedInferredConventionUnverifiedNo source·Derived
Numbers are stable citation ids — grouped by source class, so they are not consecutive.
Regulator2
[1]
Planning Inspectorate / DECC (UK Government)2014-12-10◆ Hornsea One Offshore Wind Farm variation…
“On 10 December 2014, the Secretary of State for Energy and Climate Change granted a Development Consent Order (DCO) for Hornsea One Offshore Wind Farm.”
supportsConsent
[16]
Department for Energy Security and Net Zero2026-05-06◆ Renewable Energy Planning Database (REPD…
“REPD Q1 2026 quarterly extract — Ref ID 2525: Site Name "Hornsea 1 - Heron & Njord", Development Status "Operational", Installed Capacity 1218 MWelec, Operator "Orsted (formerly Dong Energy)"”
supportsRegister entry
Operator5
[4]
Ørsted2019-02-22◆ The worlds biggest offshore wind farm Ho…
“2019-02-15T08:00:00.0000000Z ... The first turbine at the world's biggest offshore wind farm has been installed and is now producing electricity.”
supportsFirst power
[5]
Ørsted2019-06-01◆ Our Offshore Wind Farms
supportsCommercial operationStatusConnection pointO&M base (East Coast Hub)
[9]
National Audit Office2014-06◆ Early contracts for renewable electricit…
"Administrative strike prices by commissioning date and technology (2012 GBP/MWh)" - Offshore wind: 2016-17 150; 2017-18 140; 2018-19 140. FIDeR strikes are CPI-indexed; the same strike applies to all…
supportsMechanismDetail
[17]
National Energy System Operator (NESO)2026-07-21◆ NESO Transmission Entry Capacity (TEC) R…
“NESO TEC Register, edition 21 July 2026 - PRO-000315: "Hornsea Power Station 1A", Status "Built", MW Connected 400, Effective From n/a, Customer "HORNSEA 1 LIMITED"; PRO-000331: "Hornsea Power Station…”
supportsRegister entry
[21]
Octopus Energy2022-08-03◆ Octopus Energy and Nest form joint ventu…
“Octopus Energy Generation's fund management team is investing £200m in Hornsea One on behalf of Nest, one of the UK's largest pension schemes representing a third of the UK workforce. Through a joint …”
supportsfinancial
Financier4
[8]
Ørsted / Brookfield2024-10-30
“Brookfield ... 12.45% minority stakes in four of Ørsted's operational U.K. offshore wind farms. ... Ørsted will retain a 37.55% ownership interest in the four assets.”
supportsoperatorfinancial
[18]
Equitix2024-07-01◆ Equitix — Hornsea One (portfolio page, s…
“The asset is operated by Orsted. The shareholders are Orsted (50%), Equitix (14.85%), TRIG (10.15%), Greencoat (12.5%), GLIL (6.25%) and Octopus (6.25%).”
supportsfinancial
[22]
Greencoat UK Wind plc (RNS via Investegate)2025-07-30◆ Sell-down of interests in three wind far…
“The Company will also today dispose of a 1 per cent interest in Hornsea 1 offshore wind farm for a gross asset value of £69 million. This includes £39 million of UKW's proportional share of limited re…”
supportsfinancial
[23]
Greencoat UK Wind plc (RNS via Investegate)2026-02-26◆ Greencoat UK Wind plc Final Results Anno…
“In Q3 2025, the Group disposed of 32.7 per cent interests in Andershaw and Bishopthorpe onshore wind farms as well as a 1.95 per cent interest in Hornsea 1 offshore wind farm for £181 million of which…”
supportsfinancial
Auction results1
[25]
Low Carbon Contracts Company (LCCC)2026-07-31◆ lccc-portfolio-status-2026-07
Investment Contract units, all 'Live (Post-FIC)': INV-BUR-001 Burbo Bank Extension; INV-DUD-001/002/003 Dudgeon; INV-WAL-001/002 Walney Extension; INV-BEA-001/002 Beatrice; INV-HOR-001/002/003 Hornsea…
supportsInvestment contract · FID Enabling for Renewables (FIDeR) investment contracts
Trade press6
[6]
Tethys (Pacific Northwest National Laboratory)◆ Hornsea 1 | Tethys
“1218 MW. 174 turbines. SWT-7.0-154. Monopile.”
supportsTurbinesModelUnit capacityTotal capacityFoundation+2 more
[7]
Power Technology
Press report — cited, not quoted; read it at the source link.
supportsFinal investment decisionCoordinates
[10]
offshoreWIND.biz2016-11-03
Press report — cited, not quoted; read it at the source link.
supportsOnshore constructionOffshore construction
[11]
offshoreWIND.biz2018-01-26
Press report — cited, not quoted; read it at the source link.
supportsOnshore constructionOffshore construction
[12]
offshoreWIND.biz2020-01-30◆ World's Largest Offshore Wind Farm Fully…
Press report — cited, not quoted; read it at the source link.
supportsCommercial operationCOD history
[13]
DTU Wind Energy / World Bank (Global Wind Atlas)2026
supportsMean wind speed