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Hinkley Connection Project

Hinkley Connection Project

These are the pylons in the South Pool field scheduled for removal
 The Hinkley Connection Team have provided us with the following details about the project and the wildlife mitigation taking place at Portbury Wharf. 

You can also see some Frequently Asked Questions about the work on the nature reserve HERE.

About the project

The Hinkley Connection Project is a new high-voltage electricity connection between Bridgwater and Seabank near Avonmouth. It is a significant investment in the region’s electricity network and will enable National Grid to connect new sources of power to homes and businesses.

The project will play a vital role in delivering electricity efficiently, reliably, and safely and will support the UK’s move to reduce carbon emissions.

There’s a lot to do. Over the next few years in the Portishead area, we’re installing an underground cable, building a new line of T-shaped pylons and, as a result of public feedback, removing the two existing lines of pylons.

Protecting the environment

National Grid is committed to protecting the natural environment and recognises the potential impacts our construction work could have. To reduce and mitigate these impacts, we’ve carried out extensive surveys and discussed the best ways to carry out the work with specialists from Natural England, Historic England, local authorities and many others.

National Grid and our contractor, Murphy & Sons Limited, have been carrying out surveys along the route of the underground cable which includes Portbury Wharf Nature Reserve.

Environmental and ecological mitigation work at Portbury Wharf Nature Reserve

During 2018 and 2019, several ecological surveys have been carried out in the reserve, including those for bats, badgers, great crested newts and reptiles, otters, water voles, and birds.

National Grid is in the process of implementing schemes to reduce disruption to wildlife and animals at the reserve, which includes installing temporary newt exclusion fencing and other specialised methods as listed below.


There are several bat roosts within the nature reserve. To prevent any disturbance to the roosts close to where construction activity will take place, specialised buffer zones with soundproof barriers will be established. These buffer zones also act as an exclusion zone, preventing any activity or personnel being near the tree that contains the roost.


No badger setts have been found within the construction area. As a precautionary measure, mitigation measures will be used to ensure badgers do not become trapped in any excavations or stockpiles during the construction period.

Great crested newts (GCN) and reptiles

There is a medium size population of great crested newts at the reserve. In preparation for starting construction, temporary newt exclusion fencing is being installed along the construction corridor within the reserve. This fencing is specially designed to keep protected species, such as newts, from entering the site. Any newts found will be translocated to a designated receptor site within the
nature reserve. This translocation will last for a period of at least 60 days to ensure that the construction area does not contain any newts when construction starts.

Much of the nature reserve has potential to support reptiles, any reptiles found will be translocated, using the same method as used for the translocation of the great crested newts.

Otters and water voles

No otters were recorded during the surveys, but water voles were found in two of the large ditches in the north and west of the reserve. These ditches will not be impacted by the construction works, but as a precaution, a buffer zone will be established to ensure the water voles are protected.


The nature reserve contains several species of Schedule 1 birds, including barn owls and Cetti’s warbler. The nesting sites of these species will be protected during construction by establishing specialised buffer zones. To prevent disturbance to wintering birds, construction activities (excluding vegetation removal) at the reserve will be avoided during the period from September to April in each year.

The barn owl boxes will need to be temporarily removed during construction activity. They will be replaced at a ratio of 2:1 on completion of construction.

Landscaping and reinstatement

Any vegetation removed (trees and hedgerows) during this work will be reinstated in its original location or as close to the route as possible (subject to landowner agreement) on completion of construction.

To help reduce the overall impact of the new connection and enhance local landscape and biodiversity, National Grid is running a scheme for landowners to host additional native tree and hedgerow planting. Further details can be found here on the Hinkley Connection Project website.

Construction of the underground cable

National Grid has appointed, Murphy & Sons Limited, to carry out this work.

Over the next few months, Murphy’s will finalise the exact route, design and timetable for construction of the underground cable.

Ahead of construction starting in January 2020, National Grid will be inviting residents and businesses along the route to attend public drop-in events during autumn 2019.

Further information about this work and the Hinkley Connection Project is available on the project website