Connecting with the new Eryri underground cables

A section of the overhead line within the Eryri National Park, across the Dwyryd Estuary and between Minffordd and Llandecwyn, is currently being put underground in a tunnel.

This work is part of our separate Eryri Visual Impact Provision (VIP) project and is already well underway.

We will need to connect our new cables to the new Eryri underground cables. To do this safely, we will need to install equipment known as a Cable Sealing End Compound to the north of the new tunnel headhouse at Minffordd. This also means we can remove the existing Cable Sealing End Compound (below) nearby.

Learn more about the Eryri Visual Impact Provision project on the project website.

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A new substation and strengthened connection near Bryncir

Currently, we use one side of the overhead line between Pentir and Trawsfynydd, while the other side is used by SP Energy Networks to supply electricity to local homes and businesses.

We need to increase the network capacity so that it can also support additional electricity being generated, including by new renewable sources in North Wales.

As part of this, we will replace and upgrade one side of the overhead line between Bryncir and Trawsfynydd.

A new substation will also need to be built south of Bryncir to convert the electricity to a lower voltage, with a short connection to SP Energy Networks’ local network.

We already have planning permission for a new substation south of Bryncir from Cyngor Gwynedd, which was granted in 2017. However, we are reapplying as part of this project as we need to amend the design slightly.

Our work at the new substation will include removing one of the existing pylons and replacing it with one nearby.