Decommissioning Site, Trawsfynydd. LL41 4DT Data via plota.co.uk
NP5/73/287V - Full
Approved
Proposal
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 Data via plota.co.uk
Track application
Save this application and get an email when its status or decision changes.
Alerts nearby
Get email alerts for new planning applications near this address.
View original council record ↗Last checked
Application progress
✓
Received
2 Jan 2026
✓
Consultation
10 Feb 2026
✓
Committee
24 Jun 2026
✓
Approved
15 Jul 2026
Approved on 15 Jul 2026 · Dirprwyiedig/Delegated · Last checked 24 Jul 2026
Planning committee
Sign in to keep reading
Outside the UK, planning committee decisions need a free Plota account. Enter your email and we'll send a link that signs you in and brings you back to these results.
Site constraints 53
HTC gan gynnwys Llwybrau Caniataol / PRoW including permissive pathsParc a Gardd Hanesyddol / Historic Park and GardenSafle Bywyd Gwyllt Lleol / Local Wildlife SiteParc a Gardd Hanesyddol (Y Lleoliad) / Historic Park and Garden (Setting)LandfillAncient woodlandTirwedd o Ddiddordeb Hanesyddol/ Landscape of Historical LandscapePriority Species / Rhywogaethau â BlaenoriaethAwdurdod CynllunioGwarchodfa Awyr Dywyll Ryngwladol / International Dark Sky ReserveRhywogaethau Ymledol / Invasive SpeciesTrawsfynydd Snowdonia Enterprise Zone AllocationEnterprise Zone - TrawsfynyddNP5/73/16PNP5/73/16QNP5/73/16RNP5/73/16SNP5/73/16TNP5/73/16MNP5/73/16NNP5/73/16NP5/73/16BNP5/73/16CNP5/73/16DNP5/73/16ENP5/73/16FNP5/73/16GNP5/73/AD16HNP5/73/16'I'NP5/73/16JNP5/73/16KNP5/73/16UNP5/73/16L-NP5/73/113NP5/73/113DNP5/73/113ANP5/73/113ENP5/73/113BNP5/73/113C2, TAN 5, PPW 10 para 6.8Ff, TAN 24, PPW 10 para 6.1SP A; DP 1; DP 2; SP Ff; DP 8; SPG 7. TAN 24" "PPW para 6.1.20-21L; 1 / SP A; DP 1SP A; DP 1WC Act, TAN 5 para 4.6.2, SPG Nature Conservation and BiodiversitySP A; DP 1; SP D; SPG 6. TAN 5SP A; DP 1; SP D; SP Dd; SPG 6. TAN 5PPW para 6.4.2027, TAN 6, TAN 23, PPW 10 para 5.4
Snowdonia National Park
The park authority decides applications here. Great weight to conserving the landscape; major development restricted.
Landscape, scenic beauty and wildlife carry great weight, and major development is only allowed in exceptional circumstances.
Registered park or garden: Former Nuclear Power Station at Trawsfynydd:
Nationally designated heritage. Its significance and setting carry great weight.
Registered parks and gardens, battlefields, world heritage sites and protected wrecks are designated heritage assets: harm needs clear and convincing justification.
HTC gan gynnwys Llwybrau Caniataol / PRoW including permissive pathsCouncil record
Recorded by the council for this site.
Parc a Gardd Hanesyddol / Historic Park and GardenCouncil record
Recorded by the council for this site.
Safle Bywyd Gwyllt Lleol / Local Wildlife SiteCouncil record
Recorded by the council for this site.
Parc a Gardd Hanesyddol (Y Lleoliad) / Historic Park and Garden (Setting)Council record
Recorded by the council for this site.
LandfillCouncil record
Recorded by the council for this site.
Ancient woodlandCouncil record
Recorded by the council for this site.
Tirwedd o Ddiddordeb Hanesyddol/ Landscape of Historical LandscapeCouncil record
Recorded by the council for this site.
Priority Species / Rhywogaethau â BlaenoriaethCouncil record
Recorded by the council for this site.
Awdurdod Cynllunio: APCE / Planning Authority: SNPACouncil record
Recorded by the council for this site.
Gwarchodfa Awyr Dywyll Ryngwladol / International Dark Sky ReserveCouncil record
Recorded by the council for this site.
Rhywogaethau Ymledol / Invasive SpeciesCouncil record
Recorded by the council for this site.
Trawsfynydd Snowdonia Enterprise Zone AllocationCouncil record
Recorded by the council for this site.
Enterprise Zone - TrawsfynyddCouncil record
Recorded by the council for this site.
NP5/73/16PCouncil record
Recorded by the council for this site.
NP5/73/16QCouncil record
Recorded by the council for this site.
NP5/73/16RCouncil record
Recorded by the council for this site.
NP5/73/16SCouncil record
Recorded by the council for this site.
NP5/73/16TCouncil record
Recorded by the council for this site.
NP5/73/16MCouncil record
Recorded by the council for this site.
NP5/73/16NCouncil record
Recorded by the council for this site.
NP5/73/16Council record
Recorded by the council for this site.
NP5/73/16BCouncil record
Recorded by the council for this site.
NP5/73/16CCouncil record
Recorded by the council for this site.
NP5/73/16DCouncil record
Recorded by the council for this site.
NP5/73/16ECouncil record
Recorded by the council for this site.
NP5/73/16FCouncil record
Recorded by the council for this site.
NP5/73/16GCouncil record
Recorded by the council for this site.
NP5/73/AD16HCouncil record
Recorded by the council for this site.
NP5/73/16'I'Council record
Recorded by the council for this site.
NP5/73/16JCouncil record
Recorded by the council for this site.
NP5/73/16KCouncil record
Recorded by the council for this site.
NP5/73/16UCouncil record
Recorded by the council for this site.
NP5/73/16LCouncil record
Recorded by the council for this site.
-Council record
Recorded by the council for this site.
NP5/73/113Council record
Recorded by the council for this site.
NP5/73/113DCouncil record
Recorded by the council for this site.
NP5/73/113ACouncil record
Recorded by the council for this site.
NP5/73/113ECouncil record
Recorded by the council for this site.
NP5/73/113BCouncil record
Recorded by the council for this site.
NP5/73/113CCouncil record
Recorded by the council for this site.
2, TAN 5, PPW 10 para 6.8Council record
Recorded by the council for this site.
Ff, TAN 24, PPW 10 para 6.1Council record
Recorded by the council for this site.
SP A; DP 1; DP 2; SP Ff; DP 8; SPG 7. TAN 24" "PPW para 6.1.20-21Council record
Recorded by the council for this site.
L; 1 / SP A; DP 1Council record
Recorded by the council for this site.
SP A; DP 1Council record
Recorded by the council for this site.
WC Act, TAN 5 para 4.6.2, SPG Nature Conservation and BiodiversityCouncil record
Recorded by the council for this site.
SP A; DP 1; SP D; SPG 6. TAN 5Council record
Recorded by the council for this site.
SP A; DP 1; SP D; SP Dd; SPG 6. TAN 5Council record
Recorded by the council for this site.
PPW para 6.4.20Council record
Recorded by the council for this site.
27, TAN 6, TAN 23, PPW 10 para 5.4Council record
Recorded by the council for this site.
Also on the record
Radon affected area, class 2.
Not affected
Outside flood zones 2 and 3 · No listed building at the site · No scheduled monument at the site
Checked on 6 October 2026. Historic England, the Environment Agency, Natural England, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.
Work with planning data?
About Plota's data serviceEvery application in Snowdonia - and every UK council - as a live feed, an API, or a bulk CSV export.
Important details
How this decision compares
Decided in 194 days from validation, 135 days slower than Snowdonia's median of 59 for full applications. Approved, as 94% of full applications here are.
This one194d
Council59d
UK56d
47%decided within 8 weeks
94%approved
72decided in the last year
Plota live figures for full applications decided by Snowdonia in the last twelve months, from validation. Snowdonia decision record →
Consultation & key dates
- Alt. reference
- PP-14375500
- Comments by
- 30 Jun 2026
- Site or press notice
- 10 Jun 2026
- Statutory expiry
- 4 Feb 2026
Historical activity at this location
8 previous applications on record - archival context, not part of the live application.
This property
Previous applications at this address
2024
Approved
Extension of Phase 2 laydown area by raising the existing ground levels around its periph…
2023
Approved
Part retention / part completion of replacement sewage treatment plant, together with ass…
2023
Approved
Repair, improvement and extension of laydown area
2023
Approved
Drilling of 17no. boreholes for investigating and monitoring of groundwater
2023
Approved
Certificate of Lawfulness of Existing Use or Development for the demolition of the admini…
2022
Approved
Certificate of Lawfulness (Proposed Use) to reduce height of two reactor buildings
2021
Approved
Siting of single-story temporary site offices and toilet block for 18 months as a base fo…
2018
Approved
Erection of a single storey office and welfare facility building
Track this application
Decommissioning Site, Trawsfynydd. LL41 4DT
✓
Tracking this application
Not there in a minute? Check junk - especially Hotmail and Outlook.
Go to your dashboard →Sign in to view contact details
Applicant and case-officer names are hidden from public view for privacy. Create a free Plota account - or sign back in - and we'll show them, plus you get a dashboard for alerts and tracked applications.
✉