Proposed Salt Marshes: Pawlett Hams

Derek Twigg Excerpts

Wednesday 9th October 2024 Westminster Hall

[Derek Twigg (in the Chair)]

I will call Sir Ashley Fox to move the motion and then the Minister to respond. There will not be an opportunity for the Member in charge to wind up, as is the convention for 30-minute debates. At least one other Member has indicated that they wish to speak, and there may be interventions.

[Sir Ashley Fox (Bridgwater) (Con)]

I beg to move,

That this House has considered the environmental impact of the proposed salt marshes at Pawlett Hams and other sites.

It is an honour to serve with you in the Chair, Mr Twigg. I welcome the Minister to her place.

I am grateful to have this opportunity to move the motion, which concerns an issue of great importance to my constituents in Bridgwater. I asked for this debate to discuss EDF’s plans to establish a salt marsh at Pawlett Hams in Somerset. The proposal was highly unpopular with the local community. In fact, it was difficult to find anyone who thought it was a good idea, and when I met representatives from EDF, even they seemed a little half-hearted about it.

Why, one might ask, does EDF, which is building the Hinkley Point C nuclear power station a few miles down the coast, want to flood 800 acres of beautiful Somerset countryside and turn it into a salt marsh? The answer is complex. When EDF was given planning permission to build Hinkley Point C, it was required to take measures to mitigate damage to marine life caused by the water intake pipes, which are situated in the Bristol channel and, as one might imagine, there is a risk of harm to fish, which might get sucked into them.

EDF originally set out three proposals to minimise the risk of harm to marine life. The first involved designing special low-velocity, side-entry water intake pipes, with a capped head design. These reduce the number of fish that are sucked into the pipe as they swim past the end. The second was a fish recovery and return system, which means that a good proportion of the fish that swim into the intake pipe are returned to the sea, with minimal injury. That is not a perfect system, but it is certainly one that will save the more resilient species.

The third was that EDF was required to install an acoustic fish deterrent, or AFD. This involves the installation of a number of underwater sound projectors that play a constant loud noise that is designed to stop fish approaching the area of the intake pipes. EDF now says that it is unable to install the AFD, because of engineering difficulties and health and safety risks to the divers who would need to maintain the system. To deviate from the AFD proposals, EDF has to submit a material change application. As part of the application, it is working with the Environment Agency to agree several compensatory habitat measures to deliver benefit to the estuary’s qualifying habitat.

EDF says that it is putting forward a mosaic of mitigation measures. Some of them seem sensible and beneficial to the natural ecosystem in and around the Severn estuary: for example, the creation of several hectares of seagrass in the estuary and a commitment to delivering 15 hectares of kelp forest. It is also considering upgrades to several weirs to benefit migratory fish. The most significant proposal, however, and the one that brings us to Westminster Hall today, is the creation of 800 acres of salt marsh.

At the beginning of this year, EDF consulted on the salt marsh being established in Pawlett Hams, in my constituency. Pawlett Hams is a precious ecosystem. EDF’s plans to flood the area with saltwater would endanger not just the land itself, but the myriad species that call it home. It would transform the biodiverse habitat into barren, species-poor salt marsh and tidal mud. What is most extraordinary about EDF’s plans is that the Hams is an area of great ecological importance. It forms part of the Bridgwater bay site of special scientific interest, which was first declared in 1989 and recognises the area as one of particular interest to science, due to the rare species of flora and fauna that it contains. There is a lush, biodiverse habitat for many animals in the Hams, including lapwings, redshanks, otters, water voles, water beetles, great crested newts and yellow wagtails. Those species would be driven out if the area was turned into a salt marsh. The Hams provide valuable grazing for local farmers that would also be lost.

EDF’s plan was a disaster, and even if it went ahead it was not clear how it would mitigate the problem of the fish that would be lost. I made my views abundantly clear to EDF over the months, so I was delighted when, a day after making a request for this debate, it announced that it is pausing its proposal. EDF says that it is now considering four other potential sites for salt marshes in the Severn estuary, at Kingston Seymour, Littleton, Arlingham and Rodley.