For years, warnings about the fragility of Britain’s energy system were dismissed as alarmism. Critics were told the transition was “on track,” that resilience was improving, and that any instability was simply the growing pains of progress.
2025 has stripped that illusion bare.
This year did not bring a single catastrophic failure. Instead, it revealed something more troubling.
A system so tightly stretched, so over-optimised and under-maintained, that even minor shocks now expose deep structural weakness. What we are witnessing is not bad luck. It is the predictable outcome of policy decisions taken over more than a decade.
Kathryn Porter has been one of the few analysts consistently willing to state the uncomfortable truth: Britain’s energy system is no longer resilient. It is brittle.
A system with no slack
The near-blackouts of recent winters were not freak weather events. They were the consequence of demand forecasts being wrong by gigawatts. When margins are that thin, the difference between stability and emergency is measured in minutes, not megawatts.
This is not a failure of weather modelling. It is a failure of system design. A grid built around just-in-time generation, minimal reserve margins, and optimistic assumptions about availability has no resilience when reality intrudes.
In any other critical national system , aviation, water, and defence , this level of tolerance would be unthinkable.
The Heathrow warning we ignored.
The transformer failure at Heathrow should have been a national wake-up call. A single 57-year-old asset, operating well beyond its intended lifespan, triggered widespread disruption. The subsequent investigations revealed a familiar pattern: deferred maintenance, optimistic life-extension assumptions, and a regulatory framework that prioritises new connections over the integrity of what already exists.
This is not an isolated case. It is symptomatic of a system that has spent decades chasing expansion targets while quietly allowing core infrastructure to age into fragility.
When renewables don’t behave as promised
The Iberian grid event was another moment of clarity. Inverter-dominated systems do not behave like traditional power networks. When conditions turn adverse, they can fail rapidly and in unison.
Solar and wind assets disconnected when prices turned negative. Conventional generators failed to provide stabilising support. The system lost voltage control. What followed was not bad luck, but the predictable outcome of a grid built on assumptions that do not hold under stress.
These are not teething problems. They are structural characteristics of a system that has traded physical resilience for financial optimisation.
The quiet erosion of gas security.
Perhaps the least discussed but most dangerous trend is the deterioration of gas security. Declining North Sea production, shrinking storage capacity, and the economic fragility of pipeline infrastructure are converging at exactly the wrong moment.
Once pipelines are decommissioned or mothballed, they do not return easily. If sections of the network fall below viability thresholds, whole regions can become vulnerable to supply shocks. This is not a distant theoretical risk. Industry warnings suggest the mid-to-late 2020s could be critical.
Yet policy continues to assume that gas will always be there when needed. An assumption that grows less defensible by the year.
A system out of money, and out of options.
Perhaps the most uncomfortable reality is financial. The UK, like much of Europe, no longer has the fiscal capacity to endlessly correct past mistakes. Grid reinforcement, system balancing, backup capacity, and resilience measures all cost money , vast sums of it.
At the same time, governments remain politically locked into targets and timelines that bear little relationship to engineering reality. The result is a growing gap between ambition and capability, paper plans, and physical infrastructure.
This is not a transition problem. It is a governance failure.
The uncomfortable truth.
2025 did not reveal a crisis waiting to happen. It revealed that the crisis is already here , quietly managed, temporarily patched, and politically obscured.
We are no longer debating how to decarbonise efficiently. We are trying to keep the lights on while pretending the system beneath us is sound.
Kathryn Porter’s work matters because it cuts through the narrative fog. It forces a return to first principles: physics, engineering, and risk. Without that honesty, the energy transition will continue to drift , be expensive, brittle, and increasingly unsafe.
The question now is not whether the warning signs are real.
It’s whether anyone in power is prepared to listen.
Shane Oxer
Campaigner for fair, affordable, and resilient energy systems
SAY NO TO THE DESTRUCTION OF OUR LAND 
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