Rhiannon Wind Farm

2,200 MW Cancelled United Kingdom

"We are using the reports extensively and have built an updated business plan."

Haico Halbesma, Oceanteam Shipping

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Latest Update: 31 July 2014
The developers, Centrica and DONG, and the Crown Estate have agreed that the developers will cease development on the entire zone and terminate their seabed rights. The assessment of the zone has shown challenging ground conditions which using current technology make the project economically unviable. There are no plans to re-offer the zone to the market. Read More
Project Details for Rhiannon Wind Farm
General Information Name Rhiannon Wind Farm correct
Other names Zone 9, Irish Sea South East Potential Development Area, Celtic Array Rhiannon correct
Country name United Kingdom correct
Region Wales, North correct
Comments Multiple offshore HVAC stations.

Not yet determined whether HVDC offshore transmission will be incorporated. It is unlikely that HVDC will be used but it is considered the maximum worst case scenario. A HVAC transmission system would consist of up to 8 HVAC collector substations, AC array cables and up to 12 transmission cables. A HVDC transmission system would consist of up to 8 HVAC collector substations, up to 4 HVDC converter stations, AC array cables, HVAC cables from the HVAC collector stations to the HVDC converter stations and up to 12 transmission cables.

Number of met masts = 1

Turbine numbers 146 x 15MW to 440 x 4 or 5MW. Rotor diamter 140-265, hub height 115-178 and total tip height 185-310.

July 2014 The Crown Estate invited all Round 3 developers to revise the terms of their agreement as the projects transition from zone appraisals to project development. This could mean that zone development agreements are replaced with project specific contractural agreements.
Round (or category) Round 3 correct
Development status Cancelled correct
Comments on the status correct
Power & Turbines Notice any Errors? You can keep this an open resource by submitting corrections!
Project Capacity 2,200 MW correct
Turbine Model Not Decided correct
Turbine Capacity 4 MW - 15 MW correct
Number of Turbines 146 - 440 correct
Total Turbine Height correct
Hub Height 185.00 m correct
Rotor Diameter correct
Foundation Grounded: (Various options under consideration including hybrids.) 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 53.675° correct
Centre longitude -4.238° correct
Area 497 km2 correct
Depth range (Chart Datum) 36 m - 66 m correct
Depth range stated by developer 36 m - 83 m correct
Distance From Shore (reported) 19 km correct
Distance From Shore (computed from centre) 29.7 km correct
Ports Installation base correct
Ops and maintenance correct
Grid Converter/Collector platforms 4 correct
Offshore transformers 8 correct
Grid connection point Rhosgoch, Anglesey correct
Cable landing point Anglesey between Bull Bay and Port Lynas 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 41.08 km correct
Transmission type (e.g. HVAC) correct
Nominal voltage 132 kV correct
Maximum voltage 400 kV 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 493km of export cabling will be used regardless of using either a HVAC system or a HVDC system. In a HVDC system there will be both HVAC export cabling and HVDC transmission cabling. correct
Onshore Cables Number of onshore cables 30 correct
Average length per cable 0 km correct
Comments Land fall and grid connection point to be decided correct
Array Cables Array cable length 1020 km correct
Estimated cable length LogIn
Transmission type (e.g. MVAC) correct
Nominal voltage correct
Maximum voltage 66 kV correct
Burial depth correct
Number of cores 3 correct
Conductor type Copper correct
Section 1000 mm2 correct
Insulation correct
Power rating correct
Number of fibre optics correct
Minimum bend radius (MBR) correct
Comments correct
Benefits Homes powered annually 1558162 correct
CO2 reduced per year 3149045 tonnes correct
SO2 reduced per year 73234 tonnes correct
Expected life 25.0 years correct
Other Website Visit correct

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