Latest event on Greater Gabbard

Altitec completed inspection and repairs on turbines at Greater Gabbard. The work this summer followed end of warranty (EOW) inspections carried out last year, and featured two teams operating on-site over a period of six weeks. The affected turbines remained operational right up until repairs were carried out, at which point they were taken offline until the repairs were completed. During this downtime, Altitec’s technicians inspected and treated blades for damage resulting from general wear and tear and lightning damage. In total, Altitec inspected 140 turbines at the site. Read more

Latest Update: 31 August 2017

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Developer correct
Main Contractor-EPCI correct
Operator correct
Operator-Offshore Transmission
Balfour Beatty have a 20 year operations and maintenance contract that was unaffected by the transfer of full ownership to Equitix. The contract was signed in November 2013 and will run until 2033.
Owner correct
Owner correct
Owner-Offshore Transmission
Greater Gabbard OFTO plc
Project Details for Greater Gabbard
General Information Name Greater Gabbard correct
Other names GGOWL correct
Country name United Kingdom correct
Region England, East of England correct
Comments Project CAPEX cost derived from Fluor's end of year financial reports: 2008 saw an initial project cost of $1.8 billion, charges were then added to Fluor's accounts in 2010 ($343m), 2011 ($60m) and 2012 ($416m). Values were adjusted according to inflation and converted to GBP, bringing the April 2013 estimated CAPEX cost at around £1.883 billion.

The total estimated value of the Greater Gabbard Transmission Assets is £323,666,658 including financing and transaction costs (22nd November 2013); included in this value are the offshore substation, cables, onshore substation, connection costs, development, transaction costs and interest during construction.
Round (or category) Round 2 correct
Development status Fully Commissioned correct
Power & Turbines Project capacity 504 MW correct
Turbine model SWT-3.6-107 (Siemens) correct
Turbine capacity 3.6 MW correct
Number of turbines 140 correct
Total turbine height 131 m correct
Hub height 77.50 m correct
Rotor diameter 107 m correct
Foundation Grounded: Monopile correct
Windspeed 10 year mean wind speed (2000-2009) Available online now
Costs Stated project cost USD(mill) 2619.00 correct
Location & Environment Sea name North Sea, Southern North Sea (Thames) correct
Centre latitude 51.884° correct
Centre longitude 1.936° correct
Area 146 km2 correct
Depth range (Chart Datum) 4 m - 37 m correct
Depth range stated by developer 20 m - 32 m correct
Distance from shore (reported) 36 km correct
Distance from shore (computed from centre) 32.5 km correct
Ports Installation base Harwich / Zeebrugge Zeeland correct
Ops and maintenance Lowestoft correct
Grid Converter/Collector platforms None correct
Offshore transformers Greater Gabbard - Galloper Array Substation, Greater Gabbard - Inner Gabbard Substation correct
Grid connection point Leiston 132kV Substation correct
Cable landing point Sizewell 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 3 correct
Average length per cable 45.5 km correct
Transmission type (e.g. HVAC) AC correct
Nominal voltage 132 kV correct
Maximum voltage correct
Power rating correct
Number of cores 3 correct
Conductor type Cu correct
Section area 800 mm2 correct
Insulation XLPE correct
Number fibre optics 48 correct
Export minimum bend radius (MBR) correct
Burial depth 1 m correct
Comments Spare export cable is stored in Harwich.

A 16km connects the Galloper offshore substation (not wind farm) to the Inner Gabbard offshore substation.
Onshore Cables Number of onshore cables 3 correct
Average length per cable 0.59 km correct
Comments 132kV, 3 core cables. correct
Array Cables Array cable length 173 km correct
Estimated cable length Login
Transmission type (e.g. MVAC) MVAC correct
Nominal voltage 33 kV correct
Maximum voltage 36 kV correct
Burial depth 1 m correct
Number of cores 3 correct
Conductor type Cu correct
Section 240 mm2 correct
Insulation XLPE correct
Power rating 50 MVA correct
Number of fibre optics correct
Minimum bend radius (MBR) correct
Comments With 48 Single Mode 9/125/245µm fibres. Class 2 stranded conductors with longitudinal water blocking; Semi conductive extruded conductor screen; Semi-conductive core screen; Copper tape metallic screen. Armour package comprising single layer galvanised steel wire. 4.2mm Polyethylene outer sheath.

Spare cable stored with Offshore Marine Management and Harwich Dock Company.
Benefits Homes powered annually 356961 correct
CO2 reduced per year 721418 tonnes correct
SO2 reduced per year 16777 tonnes correct
Expected life correct
Other Website Visit correct

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