wind farms in
the Irish Sea

Rhiannon Offshore Wind Farm

The Rhiannon Wind Farm (RWF) is the first wind farm proposed in the Irish Sea Zone. Celtic Array has exclusive rights to seek consent for offshore wind farms within the Irish Sea Zone under an agreement reached in 2010 as part of The Crown Estate ‘Round 3’ offshore wind programme.

RWF would have an installed capacity of up to 2.2GW, which we estimate could be enough to power about 1.5 million homes with low carbon electricity. RWF would be located approximately 19km (approximately 12 miles) from the Isle of Anglesey, 34km (around 21 miles) from the Isle of Man and 60km (around 37 miles) from the Cumbrian Coast.

Rhiannon Consenting Process

RWF is situated in the Irish Sea, and lies partly within Welsh Territorial Waters, and extending into international waters. The overall proposal is therefore subject to a number of separate consent applications as shown in the table below:

Consent Type Legislation Decision Maker Parts of the Project Included
Development Consent Order (DCO) Planning Act 2008 Secretary of State for Energy and Climate Change The Nationally Significant Infrastructure Project (i.e. the wind farm generating station) and associated development outside Welsh Territorial Waters
Deemed Marine Licence Planning Act 2008 Secretary of State for Energy and Climate Change Wind Farm Site and licensable activities outside Welsh Territorial Waters
Welsh marine Licence Marine and Coastal Access Act 2009 Natural Resources Wales Licensable activities inside Welsh Territorial Waters
Planning Permission Town and Country planning Act 1990 Isle of Anglesey County Council Onshore Development

A map showing the consenting boundaries for different elements of the Rhiannon Wind Farm proposal can be viewed in the Community Consultation Document (PDF 4.65Mb).

We aim to submit all consent applications at the same time to allow clarity in decision making. We are currently planning to submit these applications in Autumn this year.

Statement of Community Consultation:

At the beginning of its first stage of consultation in 2012, Celtic Array produced a Statement of Community Consultation (SOCC) to explain how consultation will be undertaken. The documents below summarise how Celtic Array intends to consult with the local community:


Rhiannon Wind Farm second stage of statutory consultation:

20 March 2014 - 19 May 2014 (Extended to 3rd July 2014 – see below)

Celtic Array has been busy completing environmental and technical surveys and assessments and have now identified the offshore project and completed an offshore Environmental Impact Assessment which identifies the likely significant effects of the proposed development. We are now ready to consult on this with the local community prior to submitting any planning and consent applications.

Celtic Array’s second stage of statutory consultation for Rhiannon commenced on the 20th March 2014 and will run until the 19th May 2014, a period of 61 days. 

The Stage 2 consultation (Stage 1 consultation was undertaken at the end of 2012 - See details and documents from Stage 1 below) is being undertaken for our Development Consent Order application which covers the whole wind farm site itself and then any associated development outside Welsh Territorial Waters and therefore this consultation will focus on these elements.

Other consents and permissions are required for the activities within Welsh Territorial Waters eg. export cables and the onshore development works and whilst these are not formally included within this consultation, information on these elements are provided and comments welcomed so that the context of the DCO application can be fully understood. In addition, there will be a further opportunity to comment on these elements to the regulators directly when these applications are submitted.

Consultation Correction and Extension

The previously published Appendices 9.1 and 9.2 of Chapter 9 Benthic Ecology were incorrect in the Preliminary Environmental Information documents made available for the Rhiannon Stage 2 Consultation on 20 March 2014.

The document presented as Appendix 9.2 should have been included as an ‘annex’ to Appendix 9.1 and the correct Appendix 9.2, regarding environmental surveys of the proposed Export Cable Area, was omitted. The links to the correct appendices have been updated on this website and are also presented below:

These replacement documents are also available in hard copy in the locations previously advertised - see ‘Local Public Libraries’ section below.

These appendices when read in conjunction with the available Chapter 9 and existing Appendix 9.3 and 9.4 means that all information for Chapter 9 Benthic Ecology is now correct and present. The Stage 2 consultation period has been extended to 3 July 2014 to allow time to feedback on these appendices.

Consultation Documents available to download or view:

A number of consultation documents are available to view or download by clicking on the links below:

If you would like to view hard copies of the documents, they are available to view at a number of locations including government offices and public libraries locally. A full list of locations where the documents are available to be viewed is included below:

Government / Local Government Offices:

Local Authority Office name
Anglesey Isle of Anglesey County Council Planning Offices, Isle of Anglesey County Council, Council Offices, Llangefni, Anglesey, LL77 7TW
Anglesey Anglesey County Council, Council Offices, Llangefni, Anglesey, LL77 7TW
Conwy Conwy County Borough Council, Bodlondeb, Conwy, North Wales, LL32 8DU
Gwynedd Gwynedd Council, Council Offices, Shirehall Street, Caernarfon, Gwynedd, LL55 1SH
Flintshire Flintshire County Council, County Hall, Mold, Flintshire, CH7 6NB
Denbighshire Denbighshire County Council, County Hall, Wynnstay Road, Ruthin, Denbighshire LL15 1YN
Isle of Man Government Department of Infrastructure, Murray House, Mount Havelock, Douglas, Isle of Man, IM1 2SF

Local Public Libraries:

Conwy County Council Gwynedd County Council Isle of Anglesey County Council Isle of Man Government Flintshire Denbighshire
Abergele Library
Market Street, Abergele, LL22 7BP
Bangor Library Gwynedd Road, Bangor, LL57 1DT Amlwch Library
Lôn Parys, Amlwch, LL68 9EA
Castletown Library Farrants Way, Castletown, IM9 1NR Flint Library Learners’ Centre
Church Street, Flint, CH6 5AP
Prestatyn Library
Nant Hall Road, Prestatyn, LL19 9LH 
Colwyn Bay Library
Woodland Road West, Colwyn Bay, LL29 7DH
Caernarfon Library
Pavilion Hill, Caernarfon, LL55 1AS
Newborough Library
Prichard Jones Institute, Newborough, LL61 6SY
Douglas Family Library (formally Junior Library)
Nobles Hall, Westmoreland Road, Douglas, IM1 1RL
Mold Library and Museum
Earl Road, Mold, Flintshire,    CH71AP              
Rhyl Library Church Street, Rhyl, LL18 3AA
Conwy Library
Civic Hall, Conwy, LL32 8AY
Blaenau Ffestiniog Library
Canolfan Maenofferen, Blaenau Ffestiniog, LL41 3DL
Rhosneigr Library
High Street, Rhosneigr, LL64 5UX
George Herdman Library
Orchard Walk, Bridson Street, Port Erin, IM9 6AL
  Saint Asaph Library, The Roe, Saint Asaph, LL17 0LU
Conwy Mobile Library Gwynedd Mobile Library Menai Bridge Library
Wood Street, Menai Bridge, LL59 5AS
Henry Bloom Noble Library
10/12 Victoria Street, Douglas, IM1 2LH
Deganwy Library
Station Road, Deganwy, LL31 9EX
Porthmadog Library
Chapel Street, Porthmadog, LL49 9BT
Isle of Anglesey Mobile Library Isle of Man College Library
Homefield Road, Douglas, IM2 6RB
Kinmel Bay Library Community Centre, Kendal Road, Kinmel Bay, LL18 5BT   Beaumaris Library
David Hughes Community Centre, Beaumaris, LL58 8AL
Onchan Public Library
Willow House, 61 - 69 Main Road, Onchan, IM3 1AJ
Llandudno Junction Library
Maes Derw, Llandudno Junction, LL31 9AL
  Benllech Library
Bangor Road, Benllech, Tyn y Gongl, LL74 8TF
Ramsey Library
Town Hall, Parliament Square, Ramsey, IM8 1RT
Llandudno Library Mostyn Street, Llandudno, LL30 2RP   Cemaes Library Glascoed Road, Cemaes Bay, LL67 0HN Ward Library
38 Castle Street, Peel, IM5 1AL
Llanfairfechan Library
Village Road, Llanfairfechan, LL33 0AA
  Holyhead Library
Newry Fields, Holyhead, LL65 1LA
Penmaenmawr Library
Bangor Road, Penmaenmawr, LL34 6DA
  Llangefni Library
Lôn y Felin, Llangefni, LL77 7RT
Penrhyn Bay Library Llandudno Road, Penrhyn Bay, LL30 3HN   Moelfre Library Ganolfan, Moelfre, LL72 8HA      

Public Consultation Events

To help provide further information to the local community during this important period of consultation, Public Exhibitions will be held at key locations (details overleaf) in the locality of the project. Members of the Celtic Array project team will be on hand to answer any questions you may have and will welcome your feedback to our proposals. Representatives from National Grid will also be available at the public events in Llaneilian, Llangefni, Amlwch and Rhosybol to speak with you about any questions you may have regarding the onward connection for Rhiannon.

English and Welsh speakers will be available at the events or if they are not available there will be an opportunity for people to be called by a Welsh speaker.

The times and dates of Celtic Array’s planned Public Exhibitions are shown below:

Monday 31 March
2 - 7 pm
Llaneilian Llaneilian WI Hall, Amlwch, Isle of Anglesey LL68 9LS
Tuesday 1 April
2 - 7 pm
Llangefni Oriel Ynys Môn Arts centre and gallery Llangefni, Isle of Anglesey LL77 7TQ
Wednesday 2 April
12 - 5 pm
Holyhead Main Hall, Holyhead Town Hall, Newry Street, Holyhead LL65 1HN
Thursday 3 April
2 - 7 pm
Beaumaris Beaumaris Town Hall Castle St, Beaumaris, Isle of Anglesey LL58 8AP
Friday 4 April
2 - 7 pm
Amlwch Amlwch War Memorial Hall, 20 Market Street, Amlwch, Isle of Anglesey LL68 9ET
Saturday 5 April
11 - 4pm
Rhosybol Rhosybol Community Hall, Rhosybol, Anglesey, LL68 9PP
Monday 7 April
2 - 7 pm
Bangor Management Centre, Bangor University Bangor, Gwynedd LL57 2DG
Tuesday 8 April
1 - 6 pm
Llandudno Orme Suite, Venue Cymru, The Promenade, Llandudno LL30 1BB
Wednesday 9 April
2 - 7 pm
Colwyn Bay Clwyd suite, Conwy Leisure centre, Eirias Park, Colwyn Bay, Conwy LL29 7SP
Thursday 10 April
1 - 6 pm
Rhyl Wellington Community Centre, Wellington Road, Rhyl, Denbighshire LL18 1LE
Saturday 12 April
11 - 4 pm
Douglas i Museum, The Manx Museum, Kingswood Grove, Douglas, Isle of Man IM1 3LY
Monday 14 April
2 - 7 pm
Ramsey Town Hall Atrium, Ramsey Town Hall, Parliament Square, Ramsey, Isle of Man IM8 1RT
Tuesday 15 April
2 - 7 pm
Port St Mary Mount Tabor, Athol Street, Port St Mary, Isle of Man IM9 5DS

You can contact Celtic Array by:


emailing us at

calling us on 0330 1000 051

following us on Twitter: @celticarray

Rhiannon Wind Farm first stage of statutory consultation

 29th October to 20th December 2012 (now closed)

As part of stage one consultation on the offshore elements of Rhiannon wind farm, we published two important documents which can still be downloaded. The feedback received during the first phase of consultation (29th October to 20 December 2012) has been considered and details of these comments and Celtic Array’s responses can be viewed in the Interim Consultation Report.


The preferred sites and cable routes for the Onshore Development have recently been identified and will now be subject to further detailed assessment and engagement with stakeholders, prior to submission of a final proposal planned for Autumn 2014, by way of a planning application to the Isle of Anglesey County Council. This is separate from the DCO application process and therefore information on the Onshore Development is included so that the context of the DCO application can be fully understood. The preferred scheme for the Onshore Development can be seen by clicking on Figure 4 below, and currently comprises:

Figure 4 from Community Consultation Document: Onshore Development Preferred Scheme (PDF 4.54Mb)

Celtic Array has signed grid connection agreements with National Grid to connect 2GW of grid capacity from RWF to the Electricity Transmission Network on the Isle of Anglesey. A new onward connection would be required to form a connection between National Grid’s infrastructure at the Onshore Substation Site and the existing Electricity Transmission System.

National Grid has undertaken Strategic Optioneering, which has identified that the preferred strategic option for this onward connection is an overhead connection from the Rhosgoch substation site to the existing Wylfa-Pentir overhead line. Further network reinforcements will also be required to export the full generation capacity off Anglesey; these proposals are outlined and have been consulted upon in National Grid’s North Wales Connections Strategic Options Report (October 2012).

Celtic Array and National Grid are working together to ensure a co-ordinated approach to the development of these assets although National Grid will be responsible for carrying out any necessary environmental surveys and assessments and submitting any required consent applications for the onward connection works.

For clarity, the onward connection does not form part of the Onshore Development, however the Onshore Environmental Statement will consider the requirement and any likely significant environmental effects as part of the cumulative impact assessment. Further information on the Onshore Development is available within the full Stage 2 PEI report, including further detail on the preferred sites and routes, along with a description of the construction, operation and decommissioning phases. The draft onshore environmental information and assessments will be reported within the Onshore Environmental Statement, which will be submitted as part of the planning application for the Onshore Development planned for submission in Autumn this year.

Further design development of the proposals is ongoing and will be shaped by the results of the EIA. Further information on the preferred sites and routes and a description of the proposed development is provided within the Stage 2 Preliminary Environmental Information. The connection from the Onshore Substation Site to the Electricity Transmission System is the responsibility of National Grid. Celtic Array and National Grid are working together to ensure a co-ordinated approach to consenting these separate components. For more information on the National Grid onward connection, please see

Onshore EIA Scoping - May / June 2013

In May 2013, Celtic Array submitted an 'Environmental Impact Assessment Scoping Report' to Isle of Anglesey County Council (IACC). This contained details of options still being considered at that time for cable landfall sites and the onshore substation site. Furthermore, the report outlined the proposed scope and approach of the environmental impact assessment (EIA). A copy of the Scoping Report can be accessed below.

IACC considered and consulted on this report and responded with its views in a 'Scoping Opinion’. This detailed IACC’s response to Celtic Array’s approach to assessing potential environmental impacts on topics such as ecology, ornithology, socio-economics (including potential effects on tourism), cultural heritage and landscape and visual impacts.

The Scoping Opinion helped to inform an ongoing programme of environmental surveys that were conducted in late 2012 and throughout 2013. These included: habitat surveys, species surveys, archaeological surveys, landscape surveys, traffic surveys and technical feasibility studies. This work helped to refine the site options and identify preferred route corridors for the underground cable system.

Non-statutory consultation for Rhiannon Onshore proposals

Public Information Days (May - June 2013)

Although the Onshore Scoping Report was not a public consultation document, Celtic Array took the decision to engage with the local community and held a series of public information days on Anglesey in May and June 2013. These were aimed at providing updates on our progress in relation to the Onshore Development. Feedback we received from these information days informed ongoing site selection work and helped to promote our proposals within the communities most likely to be affected by the proposals.

Interim Options Selection Report

Alongside the Onshore Scoping process and the period of public information days, Celtic Array also provided copies of a document entitled ‘Interim Options Selection Report’ which provided information on the process to identify, appraise and shortlist the landfall and substation sites under consideration at the time of Onshore Scoping. A copy of the report is available to download below.

Community Drop in Days

Following our public information days, monthly drop in days were held in Amlwch and Llangefni to allow the opportunity for members of the public to ask questions to members of the Celtic Array project team. These drop in days were held in the first week of the month from August 2013 to February 2014. The events will resume again following the current Stage 2 consultation for Rhiannon with the first events scheduled to begin in the first week of May 2014.


Regular updates on the Onshore Development have been provided through the newsletters which have been issued to households across North Anglesey. Links to these newsletters are provided below:

Latest Project Newsletters

Leave a comment for Celtic Array's Rhiannon project team

To leave a comment for the Celtic Array project team, please complete the online form below.

If you would like your comment to be included as a response to Celtic Array’s second stage of statutory consultation please ensure that comments are received by 19 May 2014.

To ensure transparency in the consultation process, please note that your comments might be made available to the Planning Inspectorate and statutory authorities, such as your local council. However, we will ask for your personal details not to be placed on the public record. Instead, they will be held securely by us or by third parties instructed to do this on our behalf, in line with the Data Protection Act 1998. Your comments will only be used in connection with the Rhiannon Wind Farm consultation process and, except as noted above, won't be passed to any third parties.

Subscribe to email news about Rhiannon

To register your interest in receiving future updates and information about Rhiannon Wind Farm, please complete the online form below. Contact details shall be kept confidential and shall not be passed on to any other party.