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.
Farmdown · 2020-06
SSE Renewables → TotalEnergies 51%
- Stake
- 51%
- Consideration
- €145m
- Implied 100% value
- €284m
- Implied
- €0.26m / MW
- Basis
- Price for the equity
- 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). 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. EUR figure at the ECB 2020-06 monthly average (1.1126 EUR per GBP).
Evidence
- offshoreWIND.biz — Seagreen 1 Takes Off, Total to Take Majority Stake ↗ 2020-06 ◆ held
- SSE plc — SSE plc Annual Report 2021 ↗ 2021 ◆ held
- SSE plc (RNS) — SSE - Seagreen Offshore Wind Farm (financial close and sale to Total) ↗ 2020-06-03 ◆ held
- Companies House — Seagreen Wind Energy Limited - accounts to 31 March 2020 ↗ 2021-03-12 ◆ held
- Companies House — Seagreen Holdco 1 Limited - accounts to 31 March 2021 ↗ 2021-11-15 ◆ held
- Companies House — Seagreen Holdco 1 Limited - accounts to 31 March 2024 ↗ 2025-01-06 ◆ held
- Ofgem — Offshore Transmission: Cost Assessment for the Seagreen transmission assets ↗ 2025-03 ◆ held
From Hafrok’s transactions record
Farmdown · 2023-12
TotalEnergies → PTTEP 25.5%
- Stake
- 25.5%
- Consideration
- €606m
- Implied 100% value
- €2,376m
- Implied
- €2.21m / MW
- Basis
- Price for the equity
- 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. 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. EUR figure at the ECB 2023-12 monthly average (1.1605 EUR per GBP).
Evidence
- TotalEnergies — Scotland: TotalEnergies Farms Down 25.5% of the Seagreen Offshore Wind Farm to PTTEP ↗ 2023-12-21 ◆ held
- Ofgem — Offshore Transmission: Cost Assessment for the Seagreen transmission assets ↗ 2025-03 ◆ held
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: 2023→2023→2023-10 · 3 recorded revisions · held within the year (first announced 2023, latest 2023-10)
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 2026-08, 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 sourced statements and Hafrok’s registers
Installation complete
Installation · on record
StageOperational
In operation since2023-Q4
Offshore construction2021 → 2023-Q4
Construction ports
PortPort of Nigg ◆Foundation marshalling (Seaway 7)
PortAble Seaton Port ◆Turbine marshalling (Vestas)
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
Rests on 13 sources (12 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 Development …
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”
supportsConsentConsent appliedConsent granted
[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
[16]
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]