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£100M power tunnel faces axe amid Wylfa suspension

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A £100M project to build a power connector under the Menai Strait is under threat following developer Horizon’s decision to suspend the Wylfa nuclear plant project.

The 4km tunnel was set to run from the Wylfa nuclear site on the Isle of Anglesey, under the Menai Strait, to connect to the grid on the mainland.

A National Grid spokesperson told New Civil Engineer that it was now working with Wylfa developer Horizon to determine the future of the tunneling project. 

“Following Horizon’s announcement, we will work with them to understand the implications for the timescales of their project. This will ensure we can align our plans for the development of the infrastructure.”

The overall project to connect Wylfa to the grid is called the North Wales Connection project. It is expected to take eight years, and would involve the erection of new pylons as well as the tunnel. 

Plans for the project were submitted to the Planning Inspectorate in October. 

National Grid confirmed it had not yet started the procurement process for the tunnel under the Menai, but had previously called for contractors to register interest.

Geological drilling surveys to collect rock samples of the bed of the Menai have been carried out however.

The drilling rig spent 12 weeks working the strait to collect samples.   

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*Image shown above is of the London Power Tunnels, also a National Grid project. 

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