National Energy System Operator: Blackout Risk

Toby Perkins Excerpts

Wednesday 15th July 2026 Commons Chamber

[Mr Speaker]

I call the Chair of the Environmental Audit Committee.

[Mr Toby Perkins (Chesterfield) (Lab)]

I commend my hon. Friend’s approach. He is right to say that these allegations are incredibly serious, and that it is crucially important not only for there to be a full investigation but for it to be seen to be independent so that people can have confidence in it. He is also right to draw attention to the difference between the concerns that are raised by those whistleblowers and any suggestion that our grid is about to lead to blackouts. Does he agree that while it is absolutely true that one of the terrible legacies that this Government inherited from the last Government was a grid that had been woefully under-invested in for a very long time, and that there is a substantial need for investment in it in order to achieve our energy ambitions, that should not be allowed to be conflated with the suggestion that the lights are about to go out? Can he give confidence to my constituents this summer that NESO has given him all the assurances that he needs that there will be no blackouts?

[Michael Shanks]

I thank my hon. Friend for the way in which he has framed his remarks. He is right to say that these are incredibly serious allegations, and we take them with the seriousness with which they should be taken and will take on board any lessons learned. As for his point about the importance of grid investment, we inherited a grid that was not only in dire need of investment, but had not been designed to meet the full needs of generation that had been built for many years and not connected. We are currently constraining renewable energy that has been built over the past few years because it had not been connected to the grid. We are doing that work to ensure that the grid can continue to do what it needs to do.

As for my hon. Friend’s final point, let me state very clearly that electricity supplies were maintained throughout the June heatwave. No customer demand was subject to disconnection. Statutory frequency limits were maintained throughout the event, and the largest credible loss that could have occurred was also covered. Let me explain exactly what we mean by the margin in this instance. The margin represents the cushion of spare generation above the peak demand that is maintained by NESO, and at no point did we come close to breaching that. It did not indicate any kind of emergency situation. Demand was met, and those are the facts.