Is-orsaf Llandyfaelog
Rydym bellach wedi cwblhau ein Hymgynghoriad Cyn Ymgeisio. Byddwn yn adolygu'r adborth a gyflwynwyd ac yn mireinio ein cynigion cyn cyflwyno cais cynllunio i adeiladu is-orsaf 400 kV newydd ar dir ger Llandyfaelog. Yn unol â rheoliadau cynllunio Cymru, fe gynhaliom Ymgynghoriad Cyn Ymgeisio (PAC) o ddydd Mawrth 18 Tachwedd tan ddydd Mawrth 16 Rhagfyr, lle buom yn ymgynghori â rhanddeiliaid arbenigol a chymunedol perthnasol. Roedd hyn yn dilyn ein hymgynghoriad cyhoeddus a gynhaliwyd yn Haf 2025. Cewch weld y dogfennau technegol sy’n ymwneud â’n cais yn y Llyfrgell Ddogfennau isod. Y dyddiad cau ar gyfer cyflwyno adborth oedd dydd Mawrth 16 Rhagfyr am 11.59yh.
Mae'r Grid Cenedlaethol yn cynnig gosod is-orsaf 400 kV newydd ger Llandyfaelog, i'r de o Gaerfyrddin, er mwyn helpu i ateb y galw cynyddol am drydan yn Ne a De-Orllewin Cymru.
Rydyn ni’n adeiladu’r is-orsaf i ymateb i geisiadau cysylltu y mae NGET wedi’u derbyn yn Ne Cymru gan Green GEN Cymru a National Grid Energy Distribution (NGED).
Mae dyletswydd gyfreithiol ar NGET i gysylltu cwsmeriaid â'n rhwydwaith pan ofynnir am gysylltiad. Pan nad oes gan is-orsafoedd presennol y capasiti ar gyfer maint y cysylltiad sydd ei angen, mae’n ofynnol i ni adeiladu un newydd i ddiwallu’r angen. Yn yr achos hwn, rydyn ni’n cynnig is-orsaf newydd ger Llandyfaelog.
NGET fydd yn berchen ar yr is-orsaf 400 kV arfaethedig ger Llandyfaelog, ac yn gyfrifol am ei chynnal. Bydd yn ofynnol i ddatblygwyr sydd yn dymuno cysylltu â'r grid cael is-orsafoedd eu hunain ochr yn ochr ag is-orsaf 400 kV NGET, a byddant yn gyfrifol am sicrhau eu caniatâd cynllunio eu hunain. Mae pob prosiect yn wahanol i’w gilydd ac yn gyfrifol am sicrhau caniatâd cynllunio unigol ar gyfer unrhyw seilwaith arfaethedig.
Ble mae safle’r is-orsaf arfaethedig?
Byddai’r is-orsaf newydd tua 6km i’r de o Gaerfyrddin. Cynigir mynediad i’r safle o ffordd fynediad newydd a fydd yn cysylltu â’r A484.
Beth yw is-orsafoedd a sut maen nhw’n gweithio?
Mae is-orsafoedd yn rhannau hanfodol o’r rhwydweithiau trawsyrru a dosbarthu ac yn sicrhau bod trydan yn gallu cael ei drawsyrru ar wahanol folteddau, mewn ffordd ddiogel a dibynadwy.
Un o'r prif bethau mae is-orsaf yn ei wneud yw newid foltedd trydan. Mae angen hyn er mwyn gallu trawsyrru’r trydan ledled y wlad ac yna ei ddosbarthu drwy gymdogaethau lleol ac i’n cartrefi, ein busnesau a’n hadeiladau.
Mae NGET yn cymryd trydan a gynhyrchir o ffynonellau pŵer ac yn ei gludo drwy’r rhwydwaith o linellau uwchben y tir, ceblau ac is-orsafoedd. Mae wedyn yn cael ei drosglwyddo ar foltedd is drwy’r rhwydweithiau dosbarthu lleol i gartrefi a busnesau.
Pam mae angen yr is-orsaf newydd?
Mae'r Grid Cenedlaethol yn cynnig gosod is-orsaf 400 kV newydd ger Llandyfaelog, i'r de o Gaerfyrddin, er mwyn helpu i ateb y galw cynyddol am drydan yn Ne a Ne-Orllewin Cymru.
Rydyn ni’n adeiladu’r is-orsaf i ymateb i geisiadau cysylltu y mae NGET wedi’u derbyn yn Ne Cymru gan Green GEN Cymru a National Grid Energy Distribution (NGED).
Mae dyletswydd gyfreithiol ar NGET i gysylltu cwsmeriaid â'n rhwydwaith pan ofynnir am gysylltiad. Pan nad oes gan is-orsafoedd presennol y capasiti ar gyfer maint y cysylltiad sydd ei angen, mae’n ofynnol i ni adeiladu un newydd i ddiwallu’r angen. Yn yr achos hwn, rydyn ni’n cynnig is-orsaf newydd ger Llandyfaelog.
NGET fydd yn berchen ar yr is-orsaf 400 kV arfaethedig ger Llandyfaelog, ac yn gyfrifol am ei chynnal. Bydd angen is-orsafoedd eu hunain ar y generaduron ochr yn ochr ag is-orsaf 400 kV NGET, a byddant yn gyfrifol am sicrhau eu caniatâd cynllunio eu hunain. Mae pob prosiect yn wahanol i’w gilydd ac yn gyfrifol am sicrhau caniatâd cynllunio unigol ar gyfer unrhyw seilwaith arfaethedig.
Bydd yr is-orsaf arfaethedig ger Llandyfaelog yn helpu i ateb y galw am drydan yn Ne a De-Orllewin Cymru.
Llyfrgell Dogfennau
Yma gallwch ddod o hyd i gopïau o'r cais arfaethedig, y cynlluniau, a dogfennau ategol eraill rydym yn bwriadu eu cyflwyno i Gyngor Sir Gâr. Fel dogfennau technegol, mae'r rhain ar gael yn Saesneg yn unig. Mae'r Datganiad Cynllunio ar gael yn Gymraeg ac yn Saesneg.
Dogfennau Cyffredinol
- Application Form
- Datganiad Cynllunio
- Design and Access Statement
- EcIA and Surveys (see Ecological Impacts Assessment section below)
- Arboricultural Impact Assessment
- Green Infrastructure Statement
- TAN15 Flood Consequences Assessment
- Drainage Statement
- Construction Noise Assessment and Operational Noise Impact Assessment
- Air Quality Report
- Landscape and Visual Appraisal (LVA)
- Archaeology (see section below)
- Ground Conditions Assessment
- Transport Statement
- Outline Construction Traffic Management Plan
- Outline Construction Environmental Management Plan
- EMF Assessment
- Shadow HRA
Asesiad Effaith Ecolegol
- Ecological Impact Assessment (EcIA) Report
- Great Crested Newt Report
- Habitats and Designated Sites
- Marsh Fritillary Survey
- Protected Species Walkover
- Bat Activity Survey Report
- Bat Roost Resource Report
- Dormouse Habitat Quality Assessment Report
- Hazel Dormouse 2024 Surveys
Mapiau a Phlaniau
- Site Location Plan
- Existing Site Plan
- Proposed Site Plan Master Plan
- Proposed Site Plan Sheet 1
- Proposed Site Plan Sheet 2
- Proposed Site Plan Sheet 3
- Proposed Site Plan Sheet 4
- Proposed Site Plan Sheet 5
- Proposed Site Plan Sheet 6
- Proposed Site Plan Sheet 7
- Proposed Site Plan Sheet 8
- Proposed Site Plan Sheet 9
- Proposed Site Plan Sheet 10
- Proposed Site Plan Sheet 11
- Proposed Site Plan Sheet 12
- Proposed Access Road Plan
- Proposed Bellmouth Plan
- Temporary Works Plan
- Proposed Buildings Floor Plans
- Proposed Substation Elevations
- Proposed Building Elevations
- Proposed Earthworks and Sections
- Proposed Access Tracking
- Landscape Mitigation Strategy Plan
Archeoleg
Beth sy'n digwydd nesaf?
Cyn cyflwyno ein cais cynllunio i Gyngor Sir Gâr, cynhaliom Ymgynghoriad Cyn Ymgeisio rhwng 18 Tachwedd a 16 Rhagfyr.
Byddwn nawr yn adolygu'r adborth a gyflwynwyd ac yn mireinio ein cynigion cyn cyflwyno ein cais cynllunio yn y misoedd nesaf. Byddwn yn parhau ein trafodaethau gyda thirfeddianwyr ac efallai'n cynnal arolygon pellach a gwaith technegol ac amgylcheddol ar safle arfaethedig yr is-orsaf, ac yn y cyffiniau, er mwyn cael rhagor o wybodaeth ynghylch yr ardal ac i helpu i lywio ein cynlluniau. Mae'n bosibl y byddwch yn ein gweld ni, a'n contractwyr, yn gweithio ar y safle arfaethedig, ac yn y cyffiniau.
Sut mae cael yr wybodaeth ddiweddaraf am is-orsaf arfaethedig Llandyfaelog?
Gallwch gofrestru eich diddordeb yma i gael yr wybodaeth ddiweddaraf am is-orsaf arfaethedig Llandyfaelog.
Os oes gennych chi unrhyw gwestiynau am is-orsaf arfaethedig Llandyfaelog, gallwch hefyd gysylltu â’n tîm cysylltiadau cymunedol drwy:
E-bost: [email protected]
Ffôn: 0800 915 3595
Post: FREEPOST NG Llandyfaelog
Llandyfaelog Substation
We have now concluded our Pre-Application Consultation. We will review the feedback provided and refine our proposals ahead of applying for planning permission to construct a new 400 kV substation at land near Llandyfaelog. In line with Welsh planning regulations, we ran a Pre-Application Consultation (PAC) from Tuesday 18 November until Tuesday 16 December, where we consulted relevant specialist and community stakeholders. This followed our public consultation that we held in Summer 2025. You can view the technical documents associated with our application in the Document Library below. The deadline to provide feedback was Tuesday 16 December at 11.59pm.
National Grid is proposing a new 400 kV substation near Llandyfaelog, south of Carmarthen, to help meet the growing demand for electricity in South and South-West Wales.
We are building the substation in response to connection requests NGET has received in South Wales from Green Gen Cymru and National Grid Energy Distribution (NGED).
NGET has a legal obligation to connect customers to our network when a connection is requested. When existing substations do not have the capacity for the size of the connection required, we are required to build a new one to meet the need. In this case, we are proposing a new substation near Llandyfaelog.
NGET will own and maintain the proposed 400 kV substation near Llandyfaelog. The generators will require their own substations alongside the NGET 400 kV substation and will be responsible for securing their own planning permission. Each project is distinct from one another and is responsible for securing individual planning permissions for any proposed infrastructure.
Where is the site of the proposed substation?
The new substation would be located around 6km south of Carmarthen. Site access is proposed to be from a new access road which will connect to the A484.
What are substations and how do they work?
Substations are critical parts of the transmission and distribution networks and enable electricity to be transmitted at different voltages, securely and reliably.
One of the main roles of substations is to convert electricity into different voltages. This is needed so the electricity can be transmitted throughout the country and then distributed throughout local neighbourhoods and into our homes, businesses and buildings.
NGET takes electricity generated from power sources and transports it through its network of overhead lines, cables, and substations. It is then transmitted at a lower voltage via the local distribution networks to homes and businesses.
Why is our new substation needed?
National Grid is proposing a new 400 kV substation near Llandyfaelog, south of Carmarthen, to help meet the growing demand for electricity in South and South-West Wales.
We are building the substation in response to connection requests NGET has received in South Wales from Green Gen Cymru and National Grid Energy Distribution (NGED).
NGET has a legal obligation to connect customers to our network when a connection is requested. When existing substations do not have the capacity for the size of the connection required, we are required to build a new one to meet the need. In this case, we are proposing a new substation near Llandyfaelog.
NGET will own and maintain the proposed 400 kV substation near Llandyfaelog. The generators and distributors will require their own substations alongside the NGET 400 kV substation and will be responsible for securing their own planning permission. Each project is distinct from one another and is responsible for securing individual planning permissions for any proposed infrastructure.
The proposed substation near Llandyfaelog will help meet electricity demand in South and South-West Wales.
Document Library
Here you can find copies of the proposed application, the plans, and other supporting documents we intend to submit to Carmarthenshire County Council. As technical documents, these are available in English only. The Planning Statement is available in Welsh and English.
General Documents
- Application Form
- Planning Statement
- Design and Access Statement
- EcIA and Surveys (see Ecological Impacts Assessment section below)
- Arboricultural Impact Assessment
- Green Infrastructure Statement
- TAN15 Flood Consequences Assessment
- Drainage Statement
- Construction Noise Assessment and Operational Noise Impact Assessment
- Air Quality Report
- Landscape and Visual Appraisal (LVA)
- Archaeology (see section below)
- Ground Conditions Assessment
- Transport Statement
- Outline Construction Traffic Management Plan
- Outline Construction Environmental Management Plan
- EMF Assessment
- Shadow HRA
Ecological Impact Assessment
- Ecological Impact Assessment (EcIA) Report
- Great Crested Newt Report
- Habitats and Designated Sites
- Marsh Fritillary Survey
- Protected Species Walkover
- Bat Activity Survey Report
- Bat Roost Resource Report
- Dormouse Habitat Quality Assessment Report
- Hazel Dormouse 2024 Surveys
Maps and Plans
- Site Location Plan
- Existing Site Plan
- Proposed Site Plan Master Plan
- Proposed Site Plan Sheet 1
- Proposed Site Plan Sheet 2
- Proposed Site Plan Sheet 3
- Proposed Site Plan Sheet 4
- Proposed Site Plan Sheet 5
- Proposed Site Plan Sheet 6
- Proposed Site Plan Sheet 7
- Proposed Site Plan Sheet 8
- Proposed Site Plan Sheet 9
- Proposed Site Plan Sheet 10
- Proposed Site Plan Sheet 11
- Proposed Site Plan Sheet 12
- Proposed Access Road Plan
- Proposed Bellmouth Plan
- Temporary Works Plan
- Proposed Buildings Floor Plans
- Proposed Substation Elevations
- Proposed Building Elevations
- Proposed Earthworks and Sections
- Proposed Access Tracking
- Landscape Mitigation Strategy Plan
Archaeology
What happens next?
Ahead of our planning submission to Carmarthenshire County Council, we ran our Pre-Application Consultation from 18 November to 16 December.
We will now review the feedback provided and refine our proposals ahead of submitting our planning application in the coming months. We will continue discussions with landowners and may undertake further surveys, technical and environmental work in and around the proposed substation site to give us more information about the area and to help inform our plans. You may see us, and our contractors, working in and around the proposed site.
How can I keep informed about the proposed Llandyfaelog substation?
You can register your interest here to receive project updates about the proposed Llandyfaelog substation.
If you have any questions about the proposed Llandyfaelog substation, you can also get in touch with our community relations team via:
Email: [email protected]
Phone: 0800 915 3595
Post: FREEPOST NG Llandyfaelog