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Hinkley Point C – Tunnelling and Marine Works


Client: Balfour Beatty

Balfour Beatty will deliver one of the most complex marine engineering projects currently taking place in the world to support the construction of the first new nuclear power station built in the UK in over 20 years. The project will see the construction of three tunnels under the seabed that will supply the two reactors at Hinkley Point C with cooling water and then discharge it back into the Bristol Channel.

The tunnels will be connected to the seabed by vertical shafts more than 40 metres in depth and capped with large intake and outfall heads that allow sea water to pass through into the tunnels. Both the concrete segments and the heads will be manufactured to exacting specifications at a purpose-built facility at Balfour Beatty’s site at Avonmouth, Bristol.

Project in numbers

connecting vertical shafts
tunnels under the seabed