Latest event on Walney Extension

The Invitation to Tender (ITT) stage for the OFTO is to commence during 2018 according to the Crown Estate. According to the original tender round 5 timeline this was originally due to take place during the latter half of 2017 with a preferred bidder announced in Q1 2018 but this has been delayed. Read more

Latest Update: 30 June 2018

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Ørsted Walney Extension Holdings Limited (Ørsted A/S (formerly DONG Energy AS))
Ørsted Walney Extension Holdings Limited (Ørsted A/S (formerly DONG Energy AS))
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Project Details for Walney Extension
General Information Name Walney Extension correct
Other names Walney 3 and 4, Walney Extension East and West correct
Country name United Kingdom correct
Region England, North West correct
Comments The landfall site contains the only healthy colony of Belted Beauty moths in the UK. Consequently Horizontal Directional Drilling (HDD) will be used instead of open trenching.

Walney Extension utilises the met mast at Cirrus Shell Flats and is part of the suggested Round 1 and 2 extensions, supplying a total of 1.7GW to UK offshore wind.

Walney Extension will be part of Ofgem's Tender Round 5, expected to launch later in 2016, with regards to the sale of its offshore transmission assets once constructed.

DONG Energy expect to attain a capacity factor in excess of 45%, significantly higher than that achieved by onshore wind and solar PV.
Round (or category) Round 2.5 correct
Development status Partial Generation/Under Construction correct
Power & Turbines Project capacity 659 MW correct
Turbine model 40x MHI-Vestas V164-8.0MW and 47x Siemens SWT-7.0-154. The MHI Vestas V164 machines will be power boosted to 8.25MW. correct
Turbine capacity 8.25 MW correct
Number of turbines 87 correct
Total turbine height correct
Hub height 105.00 m correct
Rotor diameter correct
Foundation Grounded: Monopile (7.4-8.4 mm outer diameter 51.0–92.0 mm wall thickness up to 72.4m long Total Tonnage: 75,000) correct
Windspeed 10 year mean wind speed (2000-2009) Available online now
Costs Stated project cost correct
Location & Environment Sea name Irish Sea correct
Centre latitude 54.088° correct
Centre longitude -3.738° correct
Area 149 km2 correct
Depth range (Chart Datum) 20 m - 54 m correct
Depth range stated by developer 20 m - 37 m correct
Distance from shore (reported) 19 km correct
Distance from shore (computed from centre) 29 km correct
Ports Installation base Belfast Harbour correct
Ops and maintenance Barrow correct
Grid Converter/Collector platforms None correct
Offshore transformers WOW03, WOW04 correct
Grid connection point Heysham correct
Cable landing point Middleton Sands correct
Export Cables
Please note that export cables connect the offshore transformer (substation) to either; shore or an offshore HVAC-HVDC converter station for onward transmission via HVDC cabling. Please see the converters page for planned converter stations and transmission cables.

The export cable length does not generally include the onshore component. The exception is when the onshore substation is close to shore.
Number of export cables 2 correct
Average length per cable 68.3 km correct
Transmission type (e.g. HVAC) correct
Nominal voltage 220 kV correct
Maximum voltage correct
Power rating correct
Number of cores 3 correct
Conductor type correct
Section area correct
Insulation correct
Number fibre optics correct
Export minimum bend radius (MBR) correct
Burial depth 2 m correct
Comments There will also be 23km of cable between the two substations of Phase 1 and Phase 2. correct
Onshore Cables Number of onshore cables 12 correct
Average length per cable 3.7 km correct
Comments Between 132 and 220 kV - 1-1.4m burial, width 3m, 4 land fall options available, all within 1.5km, 6-15 onshore cables correct
Array Cables Array cable length 190 km correct
Estimated cable length LogIn
Transmission type (e.g. MVAC) correct
Nominal voltage 33 kV correct
Maximum voltage 34 kV correct
Burial depth correct
Number of cores 3 correct
Conductor type correct
Section correct
Insulation correct
Power rating correct
Number of fibre optics correct
Minimum bend radius (MBR) correct
Comments 66kV cable no longer under consideration.

The longest cable will measure 11.5km and the shortest 550m, all buried to a 2m target burial depth.
Benefits Homes powered annually 466740 correct
CO2 reduced per year 943282 tonnes correct
SO2 reduced per year 21937 tonnes correct
Expected life 25.0 years correct
Other Website Visit correct

Call +44 (0)1502 307 037 for more information

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