Argyll Array

1,800 MW Cancelled United Kingdom

"The team at 4C Offshore offer an excellent service - The team are very approachable and deal with any queries quickly and efficiently"

Barry Stolp, Marketing Manager IHC Hydrohammer

map not available
Project Details for Argyll Array
General Information Name Argyll Array correct
Other names Tiree Array correct
Country name United Kingdom correct
Region Scotland, Highland correct
Comments Water Depth Mostly 35m.

Rotor diameter 108-175m.

Hub height 80-115m.

4 to 6 Offshore Substations.

If the AC/DC converter station is offshore, there will be 2 converters. If placed onshore (Tiree) there will only be 1 converter station. SPR is currently targeting an offshore converter as onshore is unlikely to get consent.

Up to 4 met masts.
Round (or category) Scottish Territorial Waters 1 correct
Development status Cancelled correct
Comments on the status 2013: In December 2013 the decision was made to cease development after the development was put on hold for a year (please see the details below for the 2012 announcement). The project is not financially viable at this time, although with improvements in cost reductions, construction techniques and technology improvements the could be viable in more than a decades time.

Factors that led to the cancellation were ground conditions such as hard rock, challenging wave conditions during construction and the presence of basking sharks.

2012: In December 2012 it was announced that project development would be on hold for a year. The position will be reviewed at the end of 2013.

The surveys have identified two key species that the project has the potential to impact; basking sharks and sea birds called Great Northern Divers that feed on the site in winter. Both species favour the shallow water around the Skerryvore Reef.

In order to minimise potential impacts on birds including the Great Northern Diver, SPR are considering a revision to the design of windfarm to exclude either part or all of the Skerryvore Reef area, reducing the overall size of the windfarm. Doing this would also avoid the area where basking sharks are present as well as avoiding Skerryvore Lighthouse.
Power & Turbines Notice any Errors? You can keep this an open resource by submitting corrections!
Project Capacity 500 MW - 1,800 MW correct
Turbine Model Not Decided correct
Turbine Capacity 3.6 MW - 10 MW correct
Number of Turbines 180 - 500 correct
Total Turbine Height 202.5 m correct
Hub Height 115.00 m correct
Rotor Diameter 175 m correct
Foundation Not Decided correct
Windspeed 10 Year Mean Wind Speed (2000-2009) Available online now
Detailed wind speed data 6 hr/day/month historic data
Costs Stated Project Cost GBP(mill) 5400.00 correct
Location & Environment Sea name Minches & Western Scotland (Malin) correct
Centre latitude 56.409° correct
Centre longitude -7.122° correct
Area 361 km2 correct
Depth range (Chart Datum) 3 m - 57 m correct
Depth range stated by developer 10 m - 55 m correct
Distance From Shore (reported) 5 km correct
Distance From Shore (computed from centre) 10.3 km correct
Ports Installation base correct
Ops and maintenance correct
Grid Converter/Collector platforms Argyll Array Converter 1, Argyll Array Converter 2 correct
Offshore transformers 4 correct
Grid connection point Dalmally correct
Cable landing point Dependant on route chosen. 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 12 correct
Average length per cable correct
Transmission type (e.g. HVAC) HVAC correct
Nominal voltage correct
Maximum voltage correct
Power rating correct
Number of cores correct
Conductor type correct
Section Area correct
Insulation correct
Number fibre optics correct
Export minimum bend radius (MBR) correct
Burial depth correct
Comments Between 8-12 export cables between HVAC substations and converters depending on number of substations. Two cables per substation.

2 HVDC cables from converter(s) to mainland
Onshore Cables Number of onshore cables 4 correct
Average length per cable 16.4 km correct
Comments correct
Array Cables Array cable length correct
Estimated cable length LogIn
Transmission type (e.g. MVAC) correct
Nominal voltage correct
Maximum voltage correct
Burial depth correct
Number of cores correct
Conductor type correct
Section correct
Insulation correct
Power rating correct
Number of fibre optics correct
Minimum bend radius (MBR) correct
Comments correct
Benefits Homes powered annually 1274860 correct
CO2 reduced per year 2576491 tonnes correct
SO2 reduced per year 59918 tonnes correct
Expected life correct
Other Website Visit correct

This page is intended to be viewed online and may not be printed without a valid subscription.

Please view this page at