Heathrow Substation Outage: NESO Review

Bernard Jenkin Excerpts

Wednesday 2nd July 2025 Commons Chamber

[Michael Shanks]

First, it is important to say that Heathrow had multiple routes into its electricity network—three in fact—which is unique. This report and the processes identified in the Kelly review will give Heathrow Airport Ltd pause for thought on what it needs to do on how its network is configured and how it can adapt in such situations. Of course, this is an incredibly rare circumstance, but the whole point of resilience planning is to plan for eventualities that we think are extremely unlikely to happen but that would have a significant impact if they did. Heathrow closing is clearly one such circumstance.

Secondly, my hon. Friend is right to highlight standards and systems. I want to be careful not to prejudge the review that Ofgem has announced, because there is something to be said about standards changing over time. Maintenance backlogs obviously then have to be met, and if the issue is that maintenance that should have been carried out has not been, that is clearly an issue we will take forward. But if it is just that pieces of infrastructure were subject to standards that have changed over time, we have a wider question of how we can adapt some of that infrastructure for future standards. We will look at all those points. I repeat to the House that our electricity system is incredibly robust in its resilience. We need to do everything possible to make it even more robust, so that such instances do not have quite so significant an impact as this one did.

[Sir Bernard Jenkin (Harwich and North Essex) (Con)]

May I follow up on that and ask the Minister whether he will undertake to have a full, frank and open discussion with the relevant directorates within his Department about what it has learned from this disaster? In particular, what exercises, tabletop or virtual, must be undertaken to practise resilience in the event of future such failures? My right hon. Friend the Member for East Surrey (Claire Coutinho) is right to warn about the increasing fragility of energy security in this country. There is plenty of informed opinion that supports that view.

[Michael Shanks]

I have spoken to colleagues across the Department on these questions. They are rightly constantly looking at how we review our processes. Importantly, they are also working outside of Government and trying to break down some of the silos, so we are co-ordinating with different parts of Government that have different responsibilities. But the right hon. Member is right, and we will constantly push to do more of that.

The question of exercises is important. We had a really significant exercise under the previous Government, which looked at the Government’s response to a significant power outage. We are putting in place many of the recommendations from that exercise, which are important to take forward, but more exercise is useful.

I would slightly separate the response from the infrastructure itself failing, which is what we need to investigate quickly. The Kelly review set out that Heathrow’s response to the incident was in line with its response plan. Although the outcome was clearly not what any of us would have wanted, it goes to a wider question about the infrastructure at Heathrow, not so much the actual plan put in place when the incident did occur. Those are two slightly different things, but they are both extremely important.