What happens next
A decision on the application for a Development Consent Order for Glyn Rhonwy Pumped Storage was taken on 08 March 2017 and has now been issued.
The period for legal challenge is defined in s118 of the Planning Act 2008. Further information about legal challenge can be found in the letter sent to all Interested Parties accompanying the Secretary of State’s decision and statement of reasons.
If you have any queries about the process please email the Planning Inspectorate at [email protected] or telephone the helpline on 0303 444 5000.
Timeline (31 items)

The Welsh Minister for Climate Change has decided, under paragraph 2(1) of Schedule 6 to the Planning Act 2008, to make a non-material change to the Development Consent Order to authorise the changes set out in the application:
Decision Letter (PDF, 405KB)
Inspector’s Report to the Welsh Minister (PDF, 173KB)
Amendment Order (PDF, 64KB)

Submissions in relation to the Applicant’s request for a non-material change to the Development Consent Order have now been published.

An application for a non-material change (PDF, 289 KB) to the Glyn Rhonwy Pumped Storage Development Consent Order has been made by Snowdonia Pumped Hydro Limited. If you wish to make a representation, this should be emailed to [email protected].
As a result of ongoing Government guidance relating to the Coronavirus (COVID-19), the Planning Inspectorate Wales office based at Cathays Park is now closed and any submissions sent by post may be subject to delay. If you have difficulty in submitting a representation by email, please contact [email protected] or 0303 444 5071 and a member of the Planning Inspectorate Wales case team will be able to assist.
The deadline for receipt of representations is 4 June 2021.

The Secretary of State has issued a Correction Notice and Correction Order for this project.

The Secretary of State has granted development consent for this application. Notice of the Decision by the Secretary of State (Reg 23). For further information, please refer to the following decision documentation.
Mae’r Ysgrifennydd Gwladol wedi rhoi caniatâd datblygu ar gyfer y cais hwn. Hysbysiad o benderfyniad yr Ysgrifennydd Gwladol (Rheol 23). Am ragor o wybodaeth, cyfeiriwch at y ddogfennaeth penderfyniad canlynol
SoS Decision Letter which includes the Statement of Reasons
Development Consent Order made by the Secretary of State
Recommendation Report
Recommendation Report – Appendices
Post Examination Correspondence Log


A Consultation letter on behalf of the Department for Business, Energy and Industrial Energy (BEIS) to the Applicant and other named Interested Parties for the proposed Glyn Rhonwy Pumped Storage application, was published today.
Heddiw, cyhoeddwyd llythyr Ymgynghori ar ran yr Adran Busnes, Ynni a Strategaeth Ddiwydiannol (BEIS) at yr Ymgeisydd a Phartïon â Buddiant eraill a enwyd ar gyfer cais arfaethedig Storfa Bwmpio Glyn Rhonwy.

Responses to the Department for Business Energy and Industrial Strategy Consultation letter of 21 December 2016 have now been published.
Mae ymatebion i lythyr ymgynghori’r Adran Busnes, Ynni a Strategaeth Ddiwydiannol, ddyddiedig 21 Rhagfyr 2016, wedi eu cyhoeddi.

A Consultation letter on behalf of the Department for Business, Energy and Industrial Energy (BEIS) to the Applicant and other named Interested Parties for the proposed Glyn Rhonwy Pumped Storage application, was published today.
Heddiw, cyhoeddwyd llythyr Ymgynghori ar ran yr Adran Busnes, Ynni a Strategaeth Ddiwydiannol (BEIS) at yr Apelydd a Phartïon â Buddiant eraill a enwyd ar gyfer cais arfaethedig Storfa Bwmpio Glyn Rhonwy.


The Examining Authority issued a letter notifying Interested Parties of the closure of the examination under section 99 of the Planning Act 2008 on 8 September 2016 at 23:59. The Examining Authority now has until the 8 December 2016 to submit his recommendation report to the Secretary of State for Business, Energy and Industrial Strategy.
Cyhoeddodd yr Awdurdod Archwilio lythyr yn hysbysu Partïon â Buddiant am gau’r archwiliad o dan adran 99 Deddf Cynllunio 2008 ar 8 Medi 2016 am 23:59. Bellach mae gan yr Awdurdod Archwilio tan 8 Rhagfyr 2016 i gyflwyno ei adroddiad argymhellion i’r Ysgrifennydd Gwladol dros Busnes, Ynni a Strategaeth Ddiwydiannol.

The Examining Authority has issued a notification of procedural decision to change the Examination timetable and Request Further Information from Interested Parties.
The deadline for responses to this letter is 12 noon Monday 5 September 2016.
Mae’r Awdurdod Archwilio wedi cyhoeddi hysbysiad o benderfyniad gweithdrefnol i newid Amserlen y Cais a Gais Ragor o Wybodaeth gan bartïon â diddordeb.
Y dyddiad cau ar gyfer ymatebion i’r llythyr hon yw hanner dydd, dydd Llun 5 Medi 2016.

Deadline 8 representations have also now been published.
Mae sylwadau Dyddiad Cau 8 wedi eu cyhoeddi hefyd.

Deadline 7 representations have now been published.
Mae sylwadau Dyddiad Cau 7 wedi eu cyhoeddi.

The Examining Authority has issued the Report on the Implications for European Sites, The Examining Authority’s revised draft Development Consent Order and a Request for further information.
The deadline for responses to this letter is 12 noon Wednesday 10 August 2016.
Mae’r Awdurdod Archwilio wedi cyhoeddi’r Adroddiad ar Oblygiadau ar gyfer Safloedd Ewropeaidd, y Gorchymyn Caniatâd Datblygu drafft diwygiedig a Cais am Ragor o Wybodaeth.
Y dyddiad cau ar gyfer ymatebion i’r llythyr hon yw hanner dydd, dydd Mercher 10 Awst 2016

The Examining Authority has issued a request for further information from the Applicant and Natural Resources Wales.
Mae’r Awdurdod Archwilio wedi cyhoeddi cais am ragor o wybodaeth gan y Ceisydd a Cyfoeth Naturiol Cymru.
Mae’r Awdurdod Archwilio wedi cyhoeddi hysbysiad o benderfyniad gweithdrefnol a gais am ragor o wybodaeth gan bartïon â diddordeb

The Examining Authority has now issued its second written questions and a variation to the examination timetable.
Mae’r Awdurdod Archwilio wedi hysbysu ei ail gwestiynau ysgrifenedig ac amrywiad i amserlen yr archwiliad.

The Examining Authority has issued a procedural decision.
Agendas for the Issue Specific Hearings of 17 May and 18 May 2016 are now published.
Mae’r Awdurdod Archwilio wedi cyhoeddi penderfyniad trefniadol.
Mae agendau ar gyfer y Gwrandawiadau sy’n Benodol i Mater ar 17 Mai a 18 Mai 2016 wedi eu cyhoeddi.

The Examining Authority has issued a Notification of Hearings and a change to the Examination timetable.
Deadline 3 documents have now been published.
Mae’r Awdurdod Archwilio wedi cyhoeddi Hysbysiad o Wrandawiadau a newid i Amserlen y Cais.
Mae dogfennau Dyddiad Cau 3 wedi eu cyhoeddi.

Deadline 2 documents have now been published.
Mae dogfennau Dyddiad Cau 2 wedi eu cyheoddi.

Deadline 1 documents have now been published.
Mae dogfennau Dyddiad Cau 1 wedi eu cyhoeddi.

The Examination Timetable (Rule 8 letter) has been sent to Interested Parties
Procedural decision following Preliminary Meeting

- Preliminary Meeting takes place
- Examination begins

The notification of Preliminary Meeting (Rule 6 letter) has been sent Read the letter
The letter also includes the draft Examination Timetable and Initial Assessment of Principal Issues.




