The major substation fire near Heathrow Airport this week, which caused widespread disruption and forced one of the world’s busiest airports to shut, is a stark reminder of how critical yet vulnerable our power infrastructure really is.
One failure, and the ripple effect, is felt nationally.
Transformer explosions like this don’t happen overnight. They are the result of years of missed warning signs: poor maintenance, ageing infrastructure, overloaded systems, and, increasingly, poor power quality.
At Johnson & Phillips, we help clients prevent these failures. What happened at Heathrow was avoidable if the right systems, maintenance, and monitoring were in place.
Condition-Based Maintenance is No Longer Optional
Far too many sites still rely on outdated maintenance schedules or worse—wait until failure. In critical environments like airports, ports, manufacturing plants, and data centres, that approach is reckless.
Routine transformer oil testing, Dissolved Gas Analysis (DGA), and Partial Discharge (PD) testing provide early warning of problems. Internal arcing, overheating, and insulation breakdown can all be picked up before disaster strikes. Even thermal imaging identifies hot spots that, if ignored, lead directly to failures like we saw this week.
Power Quality – The Silent Killer
One of the biggest ignored risks in our industry today is power quality. Harmonics, voltage imbalance, and reactive power quietly hammer transformers, switchgear, and cables day after day, reducing lifespan, increasing heat, and pushing systems toward failure.
With the right Dynamic Power Factor Correction (PFC), Harmonic Filters, and Voltage Support Systems deployed strategically across a network, these stresses can be dramatically reduced. This protects infrastructure, improves efficiency, reduces carbon emissions, and alleviates demand on the grid.
Yet the issue remains—power quality is overlooked, and there is no real regulatory requirement for companies to operate ‘clean’.
Why Do We Accept Dirty Power?
The government enforces strict controls on water quality—no one is allowed to supply or consume dirty water. So why are companies allowed to consume and generate dirty power, polluting the grid with harmful harmonics, imbalances, and poor power factor?
Dirty power destroys infrastructure, wastes energy, drives up emissions, and accelerates failures. But because the lights are on—nobody acts. Until they go out.
It’s time government bodies stepped in, making power quality compliance as serious as environmental and water standards.
DNOs – A Closed Shop Protecting Themselves
Distribution Network Operators (DNOs) should be leading this conversation—but too often, they operate in a closed, self-protective bubble. Power quality is rarely discussed openly, and when raised, is either dismissed or stonewalled. There is little appetite to enforce clean power standards because it would expose weaknesses in the system.
Instead, DNOs function in self-preservation mode—keeping the status quo because, for now, the lights are on. But when the lights go out, as Heathrow proved, the cost is huge—and the finger-pointing begins.
The Industry Skills Gap – A Growing Risk
Today’s skills gap is widening fast. Apprenticeships are not what they were 30 or 40 years ago. The experienced hands—the ones who understood the whole system—are retiring. Replacing them is a generation taught to follow checklists, afraid to make a decision, trained only to react once a problem becomes unavoidable.
This leaves us reliant on systems run by people too scared—or unqualified—to act. Nobody wants the risk. Instead, we see the same blame culture play out time and time again. When a failure happens, companies scramble, pitting suppliers and competitors against each other, all trying to avoid responsibility.
All of it to save pennies—ignoring the real problem until it becomes an emergency with a multi-million-pound price tag.
Ageing Infrastructure – A National Problem
Across the country, ageing infrastructure is an increasing risk. Transformers and switchgear installed decades ago are running beyond their design life—never intended to cope with the harmonic-rich, volatile loads we see today.
Failures like Heathrow’s are not random. They’re the inevitable result of stressed, ageing systems left to run until something breaks.
Asset life modelling, condition monitoring, and strategic replacement need to be prioritised—not buried until the inevitable failure forces action.
Final Thought – Resilience is Engineered, Not Hoped For
The Heathrow substation fire is a brutal lesson—but will it be learned?
Resilience isn’t built by chance. It takes investment, trust, and leadership. Not just from asset owners but from DNOs, regulators, and government.
At Johnson & Phillips, we help our clients take control of their power systems—testing, monitoring, and upgrading to avoid disaster. We believe resilience is engineered, not reactive. And when it comes to keeping the lights on, that mindset is priceless.
It’s time the UK stopped gambling with its power infrastructure. Because when the lights go out, the cost is always far greater.
[Image Source: https://news.sky.com/video/new-footage-emerges-of-heathrow-blaze-as-airport-remains-closed-13333273]