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Our work in West Gwynedd


We need to make some important upgrades to the electricity network near Porthmadog and Bryncir to provide secure and reliable power supplies to North Wales and beyond. 

This work is needed because of the new low carbon power that will be generated by Wylfa Newydd nuclear power station on Anglesey and wind farms in Ireland. This new energy generation will increase the amount of power in the electricity network. That means we need to upgrade the network so we can get the power to the millions of homes and businesses in Wales and the rest of the UK that need it. 

Our work involves:

  • Increasing the capacity of the existing overhead line between Pentir and Trawsfynydd, and minor work at our existing substation at Trawsfynydd 
  • a new substation near Bryncir
  • replacing the existing underground cables at the Glaslyn Estuary with new cables and carrying out work to our existing equipment at Wern and Y Garth

Thanks for your feedback to our recent consultation. Our latest newsletter provides more information on our work at Bryncir, along with a detailed map of our proposals and answers to your most commonly asked questions. 

Our work near Bryncir

Our work near Bryncir

Our work involves:

  • a new substation near to Bryncir
  • replacing a single pylon on the existing line with a new one as it enters the substation
  • joining the local electricity network to the substation using underground wires and a wood pole line

Find out more

Our technical reports, which are available to read here, give more detailed information on our proposals in Bryncir. 

Take a look at our image gallery to see what our equipment could look like. You can also catch up on all our work to date in West Gwynedd by reading our previous community documents and technical reports

Your feedback and next steps

Our consultation has now closed. We’ll review all of the feedback we received, along with the information from our surveys and assessments. This will help us to develop our final proposals and see if there are any ways we can reduce the effects of our work further. 

We’ll include a report on all of your comments in our planning application which will be submitted to Gwynedd Council later this year. Gwynedd Council will then review our application, alongside feedback from stakeholders. You’ll have another opportunity to comment on the proposals as part of the planning process. 

Our work at the Glaslyn Estuary

Upgrading the underground cables at the Glaslyn Estuary

In 2012 we proposed options for upgrading existing underground cables at the Glaslyn Estuary with 12 new cables and updating equipment at existing sealing end compounds at Wern and Y Garth.

We’re not asking for feedback on this work at the moment and are still working hard to refine our proposals in this area. We’ll be able to say more about our plans for how we will carry out this work later in the year. In the meantime, you can take a look at our October 2016 newsletter, which includes a detailed map, and read our FAQs.

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