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Wylfa to Pentir


Our proposals have been influenced by the feedback we’ve received at every stage. Our detailed proposals for autumn 2016 continue this. Together with our own assessments, we’ve used feedback from communities and technical specialists to further reduce the effects of our work. 

We’ve split the route into six sections to make it easier for you to give us your feedback.

You can see how the proposals might look in your area by exploring our interactive map.

The overhead line

Wylfa to Rhosgoch (section A)

The proposals 

In this area, we’re proposing a new overhead line to the east of the existing overhead line. To connect to the substation we will re-align the existing wires. The pylon design for the new overhead line is similar to the lattice pylons on the existing line. We’re also proposing an extension to the existing substation at Wylfa.

(Click image to enlarge)

 

Reducing the effects

In this area you wanted us to consider effects on Llanfechell, Cemaes and the surrounding landscape. You also said we should think carefully about properties, tourism and farming. Effects on Bronze Age burial mounds, standing stones north of Llanfechell and the prehistoric Carrog settlement were further concerns.

  • We are proposing a lattice pylon design similar to the existing pylons so we don’t introduce a contrasting shape into the landscape. In most places the new pylons are in pairs with the existing pylons. This keeps views more open between pylons and also means wires run in the same line, which helps to reduce the visual effect
  • We are using existing pylons and realigning the wires to connect to the substation which reduces the need to remove trees through the woodland surrounding the site
  • We’ll keep on the far side of the existing line from Tregele and Llanfechell, while keeping close to the existing line and away from Cemaes. We think this helps reduce effects on these communities
  • Keeping close to the existing line also offers the best option to reduce effects on individual properties. Wherever possible we have tried to avoid encircling properties between the two lines and have ensured wires will not cross above homes
  • We’ve considered the views from Coed Cottages and Caravan Park and think keeping the pylons in pairs will reduce effects on the site
  • As the route continues south east from Llanfechell, it follows the existing line in lower ground to help reduce effects on wider views as much as we can
  • In this area we will also position pylons to reduce effects on the operation of the water treatment works near Llanfechell and the water pipelines between Llyn Alaw and the power station
  • We will also avoid routeing on the higher ground within the Mynydd Mechell Special Landscape Area
  • We plan to remove the existing meteorological mast for the old Wylfa power station

You can see how the proposals might look in your area by exploring our interactive map.

Wylfa substation extension

The proposal

We need to extend the substation to make space for the equipment needed to connect the new line to it. The size and position of the extension allows us to route the new line as it leaves the substation on the east keeping further away from Tregele and Llanfechell.

(Click image to enlarge)

Reducing the effects 

In planning the extension we have considered the views from nearby communities, including Tregele and Cemaes.

By better using space and using newer, smaller equipment we have kept the extension as small as possible. The extension will be significantly lower than the current buildings and the existing mound. The trees surrounding the substation will also help to screen it. The landscaping planned by Horizon Nuclear Power will help to further screen the substation from views from local communities.

Rhosgoch to Llandyfrydog (section B)

The proposals 

In this section, we’re proposing a new overhead line and to move sections of the existing line. The two lines keep in close parallel with pylons mostly positioned in pairs to keep effects close together. We are proposing to use a lattice pylon design similar to the existing line.

 

 (Click image to enlarge)

Reducing the effects

In your feedback you said that both residents and visitors value the open landscape and long range views in this area. You also wanted us to avoid people and properties by keeping away from Rhosybol, Rhosgoch, Llandyfrydog and the caravan park. Some people said we should put the line in farmland away from villages, while others said keep away from agricultural land as it is important to the economy. People were also concerned about the effect on wildlife around Llyn Alaw and areas of woodland.

  • We looked at different routes here to find a way of keeping the two lines in close parallel while also being careful to keep effects as low as we can on the nearby villages. Due to the location of the existing line we couldn't parallel our route here without sharp changes in the route direction and encircling properties
  • To keep the number of properties with pylons on each side to a minimum, and avoid significant changes in direction, we are proposing to re-route parts of the existing line. This allows us to keep the new and existing line in close parallel and pair up pylons 
  • We keep the new line to the west of Rhosybol before moving to the east of the existing line past Llandyfrydog. We think keeping on the opposite side of the existing line near to these communities will help reduce effects
  • We have looked carefully at views from the centre of Rhosgoch and Rhosybol when identifying pylon locations, and don't think these views will be significantly affected
  • The proposed pylon sites mean we generally avoid introducing pylons into views that don’t already have them

You can see how the proposals might look in your area by exploring our interactive map.

Llandyfrydog to B5110 north of Talwrn (section C)

The proposals

In this area, we're proposing an overhead line that is mostly in parallel with the existing line, but moves slightly to the west in the Capel Coch area. The pylons are generally positioned in pairs and we are proposing to use a similar lattice design pylon to the existing line.

(Click image to enlarge)

 

Reducing the effects

In this area, you said we should think carefully about views from individual properties and from Capel Coch and Maenaddwyn. You wanted us to consider Cors Erddreiniog and other fens. You said local tourism businesses, including guest houses and B&Bs, were important and should be considered too.

  • In the north of this section, we take a slightly wider parallel route than in other sections to avoid individual properties and reduce visual effects
  • The proposed route is on the far side of the existing line from Maenaddwyn and Hebron, which we think will help reduce effects on these areas
  • Where the new line is close to the existing line, we have mostly kept the pylons in pairs. This keeps views more open between pylons and also means wires run in the same line, which helps to reduce the visual effect
  • The route then moves further west from the existing line to keep away from the Cors Erddreiniog National Nature Reserve helping to avoid any construction effects on this protected, important and increasingly scarce habitat
  • Where the route moves away from the nature reserve, the pylons will be located in an area of lower ground away from the village 
  • Pylons will be sited to avoid the need to remove areas of woodland

You can see how the proposals might look in your area by exploring our interactive map.

B5110 north of Talwrn to Ceint (section D)

The proposals

In this area, we're proposing an overhead line in close parallel to the existing line. We have generally kept the pylons in pairs and are proposing to use a lattice design similar to the existing pylons. 

We are proposing to locate our main construction compound for the new connection to the east of Llangefni.This would be a temporary site for the duration of the work.  

This site is next to the existing and proposed second connection and will have good access from the A55 after the Llangefni Link Road is completed. This site would act as a hub for the delivery and onwards transport of construction materials and provide the main office site.

(Click image to enlarge)

Reducing the effects

You wanted us to think carefully about effects on individual properties and views from Talwrn. You also said we should consider wildlife in the area. This included Gylched Covert Wildlife Site and the woodlands and wildlife around the Afon Ceint.

  • Positioning the pylons in pairs keeps views more open between pylons and also means wires run in the same line, which helps to reduce the visual effect 
  • We have looked carefully at the siting of individual pylons west of Talwrn to avoid wires crossing above properties 
  • We have looked at views from Talwrn and properties in this area, and think keeping to the far side of the existing line will help reduce effects on the community
  • We’ve looked carefully at the height of trees in the Gylched Covert Wildlife Site and positioned pylons to reduce the number of trees that might need to be removed. We plan to plant a new area of woodland to replace any trees that are removed

You can see how the proposals might look in your area by exploring our interactive map.

Ceint to the Afon Braint (section E)

The proposals

In this area, we're proposing an overhead line that starts in close parallel with the existing line, before taking a different route to the Menai Strait area where the line goes underground. 

Where the route is in parallel with the existing line, pylons are positioned in pairs keeping views more open between pylons which helps to reduce the visual effect. Where the new line moves away from the existing line, we have looked to find the most suitable route to the start of the underground section, and sought to keep effects on properties as low as we can. 

We are proposing to use a lattice pylon design similar to the existing line for this whole section. However, where the route moves away from the existing pylons an alternative, low-height design could also be an option.

(Click image to enlarge)

Reducing the effects

In this area you had concerns about the effects of an overhead line on communities including Star, Llanfairpwll and individual properties. You alsowanted us to consider the routes used by tourists such as the A5 and A55. Plas Newydd and Bryn Celli Ddu prehistoric site were mentioned as further important locations you wanted us to consider. 

  • In the north of this section we keep in close parallel to the existing line and have sited the pylons in pairs. This keeps views more open between pylons and also means wires run in the same line, which helps to reduce the visual effect
  • The route crosses the A5 and A55 at close to a right angle and over an existing lay-by, which will help reduce disruption during construction. The line then moves away from the roads helping to reduce effects on views from these 
  • We have considered views from Star and individual properties. The route has been moved further from Star as it approaches the site of the sealing end compound (where the connection goes underground) and is on the opposite side of the A5 and A55 from the village. As a result we think this will help to reduce effects on views from Star
  • To identify the most suitable sites for pylons we have also considered individual properties and sought to affect as few properties as possible

You can see how the proposals might look in your area by exploring our interactive map.

Afon Braint to Pentir (section F)

The proposals

In this area the connection will change from overhead and go beneath the Menai Strait before returning to overhead and continuing to our existing substation at Pentir. 

To do this we'll need a sealing end compound on each side of the Strait – these compounds contain the equipment to connect the overhead and underground sections together. 

From the sealing end compounds, the connection will transfer to a tunnel under the Strait. On each side of the Strait, the cables will be installed in a vertical shaft that will be accessed through a head house building. Tunnel head houses contain important equipment such as ventilation fans, which help keep air circulating inside the tunnel and help with cooling. 

The tunnel head houses and sealing ends will be located together in an area approximately two acres in size. From the sealing end in Gwynedd, we are proposing an overhead line to Pentir substation using a lattice design similar to the existing pylons in this area.

(Click to image to enlarge)
 

In this area, you said the iconic views of the Menai Strait and the communities along the coast were important to residents and visitors. You also said that Bryn Celli Ddu, Plas Newydd, the Marquess of Anglesey’s column, the Vaynol Estate and the All Wales Coastal Path were valued. You noted the A55 as a main holiday route used by visitors.  

You also asked us to think carefully about visual effects on individual properties and businesses, including farms and holiday cottages. You raised concerns about a further overhead line and the combined effects of this with existing overhead lines and Pentir substation. 

  • We are putting the connection underground in this section helping to reduce effects on the wider Menai Strait area and the iconic views
  • The tunnel is not just under the Area of Outstanding Natural Beauty (AONB). At approximately 4km long it extends inland away from the coast. This means there should be no visual effects in the immediate area of the Strait, including Plas Newydd, the Vaynol Estate and the communities nearby, such as Star and Llanfairpwll
  • We are proposing to put the sealing end compounds and tunnel head houses next to each other. This keeps the equipment in one place and any visual effects to as small an area as possible. It also avoids the need to have an underground connection between the two sites, which reduces potential construction disruption on the local area
  • The sites we have chosen also offer good opportunities for screening using trees and surrounding landscape to further reduce visual effects
  • We are proposing to use four pylons from the sealing end compound in Gwynedd to Pentir. We have chosen locations that will have as little effect on properties as possible
  • We have sought to limit views of the line from local communities and road users by routeing near woods which will help screen the pylons

Pentir substation 

The proposals

We require an extension at the substation at Pentir for the new equipment needed to connect the new line. 

We are proposing to extend the substation on both sides.

(Click image to enlarge)

Reducing the effects

You said you wanted us to think about the views from properties near to the substation and potential visual effects on these.

  • We are proposing extensions on both sides of the substation rather than a single large extension as this provides the best opportunity to use the existing trees as screening
  • We have also thought carefully about the approach of the new line to the substation and are proposing a route that we think reduces visual effects as much as we can
  • We will use modern electrical equipment within the substation extensions that will be of lower height than the existing equipment
  • To reduce visual effects further, we are proposing an area around the substation for additional tree planting

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