Seagreen
Suction bucket jacket foundations. World record for deepest bottom-fixed at 58.7m.
Status
Operationallifecycle stage
Ownership
Location
United KingdomNorth Sea
Technology
Capacity
1,075 MW ◆
Turbines
114 × 10 MW ◆
Model
Vestas V164 10-0 ◆
Foundation
Jacket ◆
Site & conditions
Site rights
Seabed rights held ∴
Origination
Crown Estate Round 3 · 2010 ·
Water depth
41–58.6 m ◆
Distance from shore
27 km ◆
Wind speed
10.5 m/s @ 150 m ≈
Revenue & grid
Offtake
CfD · AR3 ◆
Grid
Connected ◆
Connection
Grid connection secured. Tealing 275kV substation (upgraded to … ◆
Schedule
FID
2020 ◆
COD
2023-Q4 ◆
Project timeline & ownership verified milestones on the spine · ownership from Hafrok’s transactions record
Origination · 2010-01
Crown Estate Round 3
- Awarded to
- Seagreen Wind Energy (SSE + Fluor)
- Zone
- Firth of Forth zone
- Basis
- seabed award
From the auction results — the round that created the project.
JV entry · 2020-06
SSE Renewables → TotalEnergies 51%
- Stake
- 51%
- Consideration
- €146m
- Implied 100% value
- €286m
- Implied
- €0.27m / MW
- Announced
- 2020-06
- Project stage
- FID
TotalEnergies acquired 51% controlling stake from SSE Renewables, coinciding with FID and financial close on 4 Jun 2020. Upfront consideration GBP 70m at closing, plus earn-outs up to GBP 60m subject to performance conditions (max total GBP 130m). Deal value here uses GBP 130m maximum (upfront + earn-outs). Converted at GBP/EUR ~1.12 (2020). SSE Renewables retained 49% and leads construction/operations. Total project investment ~GBP 3bn. Seagreen secured partial CfD (454 MW at GBP 41.61/MWh, AR2 2017) plus private CfD with SSE. 114 x MHI Vestas V164-10 MW turbines. Extremely low implied value reflects FID-stage risk with developer retaining construction lead and majority of capex still ahead.
Evidence
From Hafrok’s transactions record
Farmdown · 2023-12
TotalEnergies → PTTEP 25.5%
- Stake
- 25.5%
- Consideration
- €600m
- Implied 100% value
- €2,353m
- Implied
- €2.19m / MW
- Announced
- 2023-12
- Closed
- 2024-05
- Project stage
- operational
TotalEnergies farmed down 25.5% of Seagreen to PTTEP (Thailand's national E&P company) for GBP 522m (~USD 689m). Announced 21 Dec 2023, completed May 2024 after regulatory approvals. Converted at GBP/EUR ~1.15 (2023). Implied enterprise value ~USD 4.3bn (100%), multiple of ~13x expected 5-year average EBITDA. Seagreen fully operational since Oct 2023 — world's deepest fixed-bottom wind farm (114 turbines, 1075 MW). Post-deal ownership: SSE Renewables 49%, TotalEnergies 25.5%, PTTEP 25.5%. TotalEnergies and PTTEP also signed MoU for further renewables co-operation.
Evidence
- TotalEnergies — Scotland: TotalEnergies Farms Down 25.5% of the Seagreen Offshore Wind Farm to PTTEP ↗ 2023-12-21 ◆ held
From Hafrok’s transactions record
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: 2023→2023→2023-10 · 3 recorded revisions · held (announced 2023, unchanged)
Revenue & offtake contract duration and price levels · money of the day
CfD-backed offtake
● CfD · AR3
Price£41.611/MWh ·Basis2012 real · CPI-indexed
Capacity454 MWAwardedSep 2019Term15 yrs · delivery 2024/25
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). Cfd 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
CfD · AR3
Installation how the build is going · from satellite counts and Hafrok’s registers
Satellite installation tracker
counted from satellite radar images · a structure standing in the sea on a given date, not a turbine producing power · a guide, not a sourced fact
Installation · counted from satellite
Foundations105 of 114≈92% · first seen 2020-10-13
Turbines89 of 114≈78% · first seen 2021-12-18
Latest count2024-12-27from 504 satellite passes · 1 substation platform left out so the counts compare with the turbine number · the count has ended: the build is complete
Hafrok counts foundations and turbines from satellite radar images (≈): a structure is counted once it is seen standing in the sea, which is not the same as producing power. A structure first seen in the last 60 days is not yet confirmed, because on a single image a freshly set foundation and a ship holding position look alike. Substation platforms are left out so the counts compare with the number of turbines. Rows marked with a dot (·) come from Hafrok’s own registers; a supplier or contract appears only where a source states it — everything else reads “not recorded”, never guessed.
Structures standing over time · count
strong line = confirmed · light line = seen in the last 60 days, not yet confirmed · the chart counts every structure (114 turbines + 1 platform); the table counts turbines only
foundationsturbines up (a substation top being set in place counts here too)
Satellite image
Image taken2026-09-07≈Copernicus Sentinel-1 radar satellite, northbound pass
Farm covered95%≈a ring on black is a structure this pass could not see, not a mistake
Structures ringed106 confirmed · 0 not yet confirmed≈as counted on 2024-12-27 · 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 Nigg ◆Foundation marshalling (Seaway 7)
PortAble Seaton Port ◆Turbine marshalling (Vestas)
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 (106)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 · 1
Offshore substationSeagreen Offshore Substation Platform·66/220 kV · owner Seagreen Phase 1 OFTO (Equitix and Kyuden Group); built by Seagreen Wind Energy Ltd
Sources & verification
17/18 fields verified · rests on 13 sources (11 primary) · ◆ 11 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.
Regulator5
[2]
Marine Scotland (Marine Directorate)◆ Seagreen Offshore Wind Farm DSLP
supportsWater depthCoordinates
[3]
Marine Scotland (Marine Directorate)2014-10◆ Seagreen Alpha and Bravo Offshore Wind F…
“Seagreen Alpha and Seagreen Bravo Offshore Wind Farms and associated Transmission Infrastructure, awarded marine licences and section 36 consents in October 2014”
supportsConsent
[4]
UK Department for Business, Energy & Industrial Strategy (BEIS)2019-09-20◆ CfD Allocation Round 3 results
“Seagreen Phase 1 | Seagreen Wind Energy Limited | Offshore Wind | 454.00 | 41.611 | 2024/25.”
supportsMechanismDetail
[12]
Department for Energy Security and Net Zero2026-05-06◆ Renewable Energy Planning Database (REPD…
“REPD Q1 2026 quarterly extract — Ref ID 2540: Site Name "Seagreen", Development Status "Operational", Installed Capacity 1075 MWelec, Operator "SSE / Seagreen Wind Energy Ltd"”
supportsRegister entry
[14]
Scottish Government Marine Directorate (MD-LOT)2026-08-23◆ Scottish MD-LOT marine projects register…
“Register row "Seagreen Alpha and Bravo Offshore Wind Farms" (key ml/seagreen-alpha-and-bravo-offshore-wind-farms): Application stage "Post-consent", type "Renewables - Wind". Register row "Seagreen Al…”
supportsRegister entry
Operator4
[1]
SSE Renewables◆ Seagreen Offshore Wind Farm | SSE Renewa…
“Final Investment Decision was reached on 3 June 2020 ... Foundation installation commenced in October 2021. ... Seagreen secured a 15-year CfD contract in 2019, for 454MW and the Final Investment Deci…”
supportsoperatorFinal investment decisionOnshore constructionOffshore constructionTurbines+5 more
[5]
TotalEnergies2023-12-21◆ Scotland: TotalEnergies Farms Down 25.5%…
“Following this farm down, TotalEnergies retains 25.5% of Seagreen, alongside PTTEP (25.5%) and SSE Renewables (49%).”
supportsowner
[8]
TotalEnergies2023-10-17◆ TotalEnergies commissions its biggest of…
supportsStatusConnection point
[13]
National Energy System Operator (NESO)2026-07-21◆ NESO Transmission Entry Capacity (TEC) R…
“NESO TEC Register, edition 21 July 2026 - PRO-000527: "Seagreen 1 Offshore Wind Farm", Status "Built", MW Connected 1075, Effective From n/a, Customer "Seagreen Wind Energy Limited"”
supportsRegister entry
Auction results1
[15]
BEIS (gov.uk)2019-09◆ cfd-ar3-results-2019
Offshore Wind awards (2012 prices): Doggerbank Creyke Beck A P1 1,200.00 MW, GBP 39.650, 2023/24; Creyke Beck B P1 1,200.00 MW, GBP 41.611, 2024/25; Teeside A P1 1,200.00 MW, GBP 41.611, 2024/25; Sofi…
supportsCfD · AR3
Trade press3
[6]
offshoreWIND.biz2022-08-23
Press report — cited, not quoted; read it at the source link.
supportsFirst powerFoundation marshalling (Seaway 7)Turbine marshalling (Vestas)
[7]
reNEWS2023-10-17◆ Seagreen enters full commercial operatio…
Press report — cited, not quoted; read it at the source link.
supportsCommercial operationCOD history
[9]