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New Essential Infrastructure

Hinkley Point C Connection

South West

About the project

In the South West, EDF Energy has been granted a Development Consent Order for a new nuclear power station at Hinkley Point. A number of other significant new electricity generation projects such as Seabank 3 are also proposed. These low carbon energy projects will help meet the country’s increasing demand for energy in a sustainable way.

It is National Grid’s role to connect these new electricity generators to our network so that we can all benefit from the energy they produce. To do so, we need to provide additional electricity capacity in the South West to make sure these new connections are safe and reliable.

We believe the best way to provide this additional capacity is to remove the existing 132,000 volt overhead electricity line owned by Western Power Distribution, and build a new 400,000 volt connection between Bridgwater and Seabank.

We are proposing to remove 65 kilometres (40 miles) of existing 132,000 volt overhead line between Bridgwater and Avonmouth substations and put up 46.6 kilometres (29 miles) of 400,000 volt overhead line. Over eight kilometres (five miles) of the new connection would be placed underground through and either side of the Mendip Hills Area of Outstanding Beauty (AONB), leaving this part of the Mendip Hills free from pylons for the first time in more than 40 years. Eight kilometres (five miles) of existing 132,000 volt overhead line from Nailsea to Portishead substation would also be put underground.

Overall, there would be around 90 fewer pylons. The new pylons would be carrying more electricity and would therefore be larger than the existing ones. We are introducing the shorter T-pylon to help address this.