DEVELOPERS who want to build a £100m tunnel under the Menai Strait have angered  councillors by  “refusing” to meet them and not providing enough information about their plans

The National Grid’s proposals for a tunnel to connect Wylfa Newydd to the main network is set to take five years to complete, based on a 32km network of power tunnels currently being constructed in central London.

But a motion to be discussed by Anglesey councillors will call on the Grid to carry out another public consultation amid concerns that the lack of detailed information they’ve provided means that neither the public nor the council are in a position to consider its full impact.

The Planning Inspectorate will make a final decision, with the public having a chance to submit their views after the proposals are submitted for consideration – expected to be shortly after Horizon submits its application for the nuclear power station.

The 4km underground tunnel is set carry the cables to avoid using pylons at the popular beauty spot, despite calls for collaborative working with the Welsh Government so that a proposed third Menai crossing could incorporate the cables instead.

But the Grid says its forging ahead with the tunnel as their customer, Horizon Nuclear Power, requires a connection by the mid-2020s when Wylfa Newydd is expected to be operational.

The tunnel is set to be buried up to 100 metres deep, measuring 5 metres in diameter with tunnel boring machines drilling under the surface and lining it with concrete.

On each side of the Menai, tunnel head houses, roughly the size of a three storey building, will help ventilate the tunnel and stop the cables from overheating.

To facilitate the works, the Grid has proposed temporary road closures in the area surrounding Llanfairpwll in order to accommodate the heavy goods vehicles as the work goes on.

But Cllr Carwyn Jones’ motion, to be discussed at full council on Tuesday, raises concerns about the impact of traffic, particularly HGVs  around the proposed tunnel head building, including  Llanfairpwll and Llandaniel Fab

Noting that the Grid has “refused” requests to attend a formal briefing session with members, the motion also calls for the company to provide the information and respond to councillors’ questions.

Cllr Jones, the portfolio holder for major projects and economic development, added: “Its extremely frustrating that senior National Grid officers don’t want to speak to us.”

In response, Gareth Williams, senior project manager for the North Wales Connection project, said “During the many years in which we have been developing our plans for this vital new connection, we have shared over 40,000 pages of technical documents and have held around 120 meetings with members and officers of the council.

“These have included 80 individual workshops on the detail of our proposals and how we are trying to mitigate their effects – including how we intend to build the tunnel under the Menai Strait and detailed information on traffic and transport.  The council’s leadership and officers have replied with over 300 pages of formal responses.

“We have also consulted extensively with local communities and have received hundreds of pieces of feedback from them on all aspects of our project.

He added, “We note the motion due to be discussed by the council and would stress that we follow all relevant planning legislation and guidance when planning and carrying out work in Wales.”

Cllr Jones’ motion will be discussed during a full council meeting in Llangefni on Tuesday, May 15.