Electricity Grid Upgrades

Debate between Bernard Jenkin and John Hayes

Tuesday 26th November 2024 Westminster Hall

[Sir John Hayes]

That is a good point, and it is why Lincolnshire county council’s submission to National Grid specifically takes into account the trenching problem that the hon. Lady raised. It suggests an offshore grid, but obviously one that avoids the damage she mentioned. I recommend that she studies that submission—it is in the public domain—to see how we can offshore that grid without damaging the salt marshes in the way she suggests.

[Sir Bernard Jenkin]

The hon. Member for East Thanet (Ms Billington) made the relevant point that there are balancing factors. First, once cables are undergrounded, they are maintenance free, but pylons require constant maintenance, which therefore adds to their carbon footprint. Everybody has seen that. Secondly, salt marshes are very often Ramsar sites and migration bird sites, and we do not want overhead power lines interfering with the migration of birds. We often see that scores of swans have been killed on power lines because they are not very good at navigating around these things.

[Sir John Hayes]

With the insight for which he is known, my hon. Friend has anticipated two of the points that I was going to make. The problem with pylons being so close to SSSIs is that the birds do not know boundaries. Of course, the salt marsh in Lincolnshire matters because, exactly as my hon. Friend said, it is important as a site for geese and duck in particular. To run the pylons so close to that is at best highly contentious and at worse wholly destructive. The offshore grid that my hon. Friend describes can be run further out to sea, which is what we do with cables routinely. If we were able to see the ocean bed around our islands, we would see any number of trunked cables that run through them, which provide vital power and communications infrastructure.

[Sir John Hayes]

There is a big argument to be had about costs because we are planning a project that will last decades—perhaps even longer. When I was the Energy Minister, I was very conscious of the fact that we might be making 100-year decisions. It is very hard to gauge costs over time because of two things. First, there are the ongoing maintenance costs associated with any line that runs above ground, and given the changing climate, it is likely that extreme weather events will become more frequent, and extreme weather events will have an effect on anything above ground. Secondly, the relative costs of underground and overhead cables vary according to the kind of cable laid, as my hon. Friend the Member for Harwich and North Essex (Sir Bernard Jenkin) said; and indeed some of the evidence from other places in Europe and elsewhere suggests that the cost of trunking cables underground is falling, whereas there is no similar reduction in the cost of overhead cables, which, on pylons, have been at the same cost for a very long time indeed.

The final point is about consent. The longer these things take, the more they cost. Certainly in Lincolnshire—and I imagine this is true in Essex, Suffolk and other places—there will be protracted legal challenges to the pylons, whereas, with local support and the support of local authorities like Lincolnshire county council, undergrounding would be a much more straightforward affair. Factoring in those costs is complex, but it needs to happen.

[Sir Bernard Jenkin]

Very briefly, the ESO review of the east of England network demonstrated that there is a higher up-front cost for undergrounding of an extra £1 billion from Norwich to Tilbury, but in the longer term it saves money. It is just not correct to say that undergrounding is automatically much more expensive. That is a departmental mantra that is now discredited—just read the ESO and NESO documents.