Town & Country Planning - Works undertaken at Trawsfynydd substation as part of the Pentir to Trawsfynydd Reinforcement Project, Decommissioning Site

 DATGANIAD O BENDERFYNIAD AR GAIS EIA
DEDDF CYNLLUNIO GWLAD A THREF 1990
RHEOLIADAU CYNLLUNIO GWLAD A THREF
(ASESIAD EFFAITH AMGYLCHEDDOL)
(CYMRU) 2017 RHEOLIADAU 28

Mae Awdurdod Parc Cenedlaethol Eryri wedi penderfynu ar gais gan National Grid Electricity Transmission PLC am ganiatâd cynllunio ar gyfer datblygiad sy’n dod o fewn cwmpas y Rheoliadau uchod (a elwir yn “ddatblygiad AEA” yn y Rheoliadau). Y Cais, cyfeirnod NP5/73/287V  ar gyfer:

Gosod ceblau tanddaearol newydd, a phennau selio ceblau, adweithydd ‘shunt’, gantri a lledu rhan o'r ffordd fynediad presennol o fewn y compownd wedi'i ffensio yn is-orsaf Trawsfynydd a gwaith ategol cysylltiedig fel rhan o Brosiect Atgyfnerthu Pentir i Drawsfynydd, Safle Dadgomisiynu, Trawsfynydd. LL41 4DT wedi ei gymeradwyo gydag amodau.

Mae cynnwys y penderfyniad ac unrhyw amodau ar gael ar safle we'r Awdurdod www.eryri.llyw.cymru. I edrych ar y rhybudd penderfyniad, gellir eu gweld drwy ddewis ‘Cynllunio a Datblygu’ ar y dudalen gartref, cyn dewis ‘Chwilio Ceisiadau Cynllunio’ i ddarganfod yr opsiynau sydd ar gael.

Mae’r prif resymau ac ystyriaethau y mae’r penderfyniad yn seiliedig arnynt, ynghyd â gwybodaeth am gyfranogiad y cyhoedd, ar gael ar safle we'r Awdurdod www.eryri.llyw.cymru .

O dan Adran 288 o Ddeddf Cynllunio Gwlad a Thref (1990), os yw unrhyw berson yn ddig ynghylch y penderfyniad ac yn dymuno cwestiynu dilysrwydd y penderfyniad hwnnw;
a) nad yw’r gorchymyn o fewn pwerau’r Ddeddf hon, neu
b) na chydymffurfiwyd ag unrhyw un o’r gofynion perthnasol mewn perthynas â’r
gorchymyn hwnnw, caiff wneud cais i’r Uchel Lys o dan yr adran hon o fewn 42 diwrnod (6 wythnos) o ddyddiad y penderfyniad: 15/07/2026

Cyswllt: Penderfyndiadau Cynllunio ac Amgylchedd Cymru (PEDW), Adeiladau'r Goron, Parc Cathays, Caerdydd, CF10 3NQ. Ffôn: 0300 123 1590.  

Gall unrhyw berson arall sy’n dymuno herio’r penderfyniad hwn wneud hynny drwy wneud cais i’r Uchel Lys am adolygiad barnwrol o dan Adran 31 o Ddeddf yr Uwch Lysoedd 1981.

Rhaid gwneud cais o’r fath yn brydlon a, beth bynnag, ddim hwyrach na 3 mis ar ôl dyddiad y penderfyniad: 15/07/2026

ATODLEN 1
(i) Cynnwys y penderfyniad ac unrhyw amodau/rhesymau ynghlwm wrtho: Mae Pwyllgor Cynllunio  a Mynediad Awdurdod Parc Cenedlaethol Eryri wedi ystyried yn ofalus y materion cynllunio a godwyd gan y cynnig hwn, ynghyd â’r holl sylwadau a dderbyniwyd, ac, o ystyried polisi cynllunio cenedlaethol, rhanbarthol a lleol, (y Cynllun Datblygu) wedi dod i’r casgliad y dylid caniatáu caniatâd cynllunio yn amodol ar amodau.

ATODLEN 2 (ii)
Y prif resymau ac ystyriaethau y seiliwyd y penderfyniad arnynt, gan gynnwys, os yn berthnasol, gwybodaeth am gyfranogiad y cyhoedd  

O ystyried y wybodaeth amgylcheddol sydd yn y Datganiad Amgylcheddol caniateir cais cynllunio NP5/73/287V am y rhesymau a’r ystyriaethau a nodir yn adroddiad Pwyllgor Cynllunio a Mynediad Awdurdod Parc Cenedlaethol Eryri dyddiedig 24/06/26

Dyddiad: 15/07/2026

STATEMENT OF DECISION ON AN EIA APPLICATION
TOWN AND COUNTRY PLANNING ACT 1990
TOWN AND COUNTRY PLANNING
(ENVIRONMENTAL IMPACT ASSESSMENT)
(WALES) REGULATIONS 2017 REGULATION 28

Eryri National Park Authority has determined an application by National Grid Electricity Transmission PLC for planning permission for development falling within the scope of the above Regulations (called “EIA development” in the Regulations). The Application, reference NP5/73/287V for:

Installation of new underground cables, and cable sealing ends, shunt reactor, gantry and the widening of part of the existing access road within the fenced compound at Trawsfynydd substation and associated ancillary works as part of the Pentir to Trawsfynydd Reinforcement Project, Decommissioning Site, Trawsfynydd. LL41 4DT
has been Approved subject to conditions.

The content of the decision and any conditions attached are available on the Authority's website at www.eryri.llyw.cymru. To view the copyrighted public documents submitted with the application, can be accessed by selecting ‘Planning & Development’ link from the home page before choosing ‘Search Planning Applications’ from the available options. The main reasons and considerations on which the decision is based, along with information about the participation of the public, is contained in Schedule 2 below. Under Section 288 of the Town and Country Planning Act (1990), if any person is aggrieved by the decision and wishes to question the validity of that decision in that;  

a) the order is not within the powers of this Act, or
b) any of the relevant requirements have not been complied with in relation to that order, he/she may make an application to the High Court under this section within 42 days (6 weeks) from the date of the decision: 15/07/2026.
Contact: Planning and Environment Decisions Wales(PEDW) Crown Buildings, Cathays Park, Cardiff CF10 3NQ Tel: 0300 123 1590 Any other person wishing to challenge this decision may do so by way of an application to the High Court for judicial review under Section 31 of the Senior Courts Act 1981. Such application must be made promptly and, in any event, not later than 3 months after the date of the decision: 15/07/2026.

SCHEDULE 1
(i) The content of the decision and any conditions/reasons attached thereto:

Eryri National Park Planning and Access Committee has considered carefully the planning issued raised by this proposal, together with all representations received, and, having regard to national, regional and local planning policy, (the Development Plan) has concluded that, planning permission should be permitted subject to conditions.

SCHEDULE 2
(ii) The main reasons and considerations on which the decision is based, including, if relevant information about the participation of the public

Considering the environmental information contained within the Environmental Statement planning application reference NP5/73/287V is permitted for the reasons and considerations set out within Eryri National Park Planning and Access Committee report dated 24/06/26   Date: 15/07/2026

Keira Sweenie
Cyfarwyddwr Cynllunio & Partneriaethau / Director of Planning & Partnerships
Awdurdod Parc Cenedlaethol Eryri National Park Authority,
Swyddfa Awdurdod Parc Cenedlaethol / National Park Authority Office,
Penrhyndeudraeth, Gwynedd. LL48 6LF
www.eryri.llyw.cymru