The National Grid collapses, Britain goes dark… chaos is unleashed: Nightmare scenario that Britain’s Net Zero obsession is pushing us ever closer to, by energy expert KATHRYN PORTER
An energy analyst has laid out a hypothetical scenario in which a supply-demand imbalance triggers a cascading failure of Britain's national grid, plunging the country into darkness and disrupting hospitals, transport, communications and emergency services. Writing as a warning rather than a prediction, energy consultant Kathryn Porter argues the grid is now more fragile than at any point since privatisation in 1990, and links this vulnerability to policies pursued in the name of Net Zero.
Her central concern is a proposal from the National Energy System Operator (Neso) to run the grid with reduced "inertia" — the stabilising kinetic energy stored in spinning generator components — in order to save £96 million a year and support Net Zero targets, a move she says she formally objected to with Ofgem last year. She points to recent strain on the network during the current heatwave, including the suspension of electricity exports via four of ten interconnector cables last month, and a claim by shadow energy secretary Claire Coutinho that whistleblowers said Britain narrowly avoided a blackout on 23 June when temperatures hit 34°C.
- Expert warns a Net Zero-driven grid policy risks a nationwide blackout
- Neso wants reduced grid "inertia" to cut costs by £96m annually
- Britain reportedly narrowly avoided a blackout during June's 34°C heatwave
New here? Start with this
Britain's electricity system runs on a constant, split-second balance between how much power is generated and how much is being used. If that balance is disrupted badly enough, it can trigger a cascading failure across the National Grid, the network that carries electricity around the country, potentially cutting power to homes, hospitals, transport and communications. Such a nationwide blackout has not happened in Britain before, though smaller regional outages have.
Kathryn Porter, an independent energy consultant, has raised concerns about the resilience of this system. Her focus is on the National Energy System Operator (Neso), the body responsible for balancing supply and demand on the grid, and a proposal it has put forward to change how the network is run in order to cut costs and support the government's Net Zero targets, which aim to reduce Britain's greenhouse gas emissions to net zero by 2050. Ofgem, the industry regulator, oversees such proposals.
Debate over the pace and cost of Net Zero policies, including their effect on energy security, has become a recurring political flashpoint in Britain, with the Conservative Party's shadow energy secretary, Claire Coutinho, among those raising questions about grid reliability. This story sits within that wider argument about how Britain balances reducing emissions with keeping the lights on.
Both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
Those sympathetic to Kathryn Porter's warning argue that grid stability should never be treated as a variable to be optimised away for cost savings, however modest, when the consequence of getting it wrong is catastrophic and hard to reverse. They point to tangible recent strain, including suspended interconnector exports and a reported near-miss during the June heatwave, as evidence that margins are already tighter than the public realises. On this view, reducing system inertia to hit Net Zero targets prioritises a long-term climate goal over the immediate, non-negotiable duty to keep hospitals, transport and communications running, and raising the alarm now, before any incident occurs, is a responsible use of expert scrutiny rather than scaremongering.
The case against
Those defending Neso's approach and the broader Net Zero transition argue that system operators continuously model and manage inertia, frequency response and reserve margins using established engineering tools, and that adapting these to a grid with more renewables and interconnection is a normal, well-understood part of modernising energy infrastructure rather than a reckless gamble. They would note that headline-grabbing hypothetical blackout scenarios can mislead the public about genuine risk levels, that near-miss claims from political opponents are not the same as verified operational data, and that the £96 million saving reflects real efficiency gains from newer stabilising technologies. On this view, singling out Net Zero policy as the driver of fragility risks obscuring other long-standing pressures on an ageing grid, such as underinvestment and rising demand, and could unduly slow a transition that is itself framed as a long-term safeguard against climate-related risks to national infrastructure.