A dramatic video of a burning electric car can make the danger feel common. Yet a video tells us almost nothing about frequency. To judge risk, we need to know how many vehicles of each type are on the road, how far they travel and how old they are. To plan a rescue, we need a different question: what happens if the high-voltage battery is involved? The answers should not be collapsed into one argument for or against electric cars.
UK government guidance says there is no evidence that electric vehicles are more likely to catch fire than petrol or diesel vehicles, while acknowledging that British comparison data remain limited. International studies have suggested lower rates for electric vehicles.¹ A separate government-commissioned review of covered car parks reaches a similar provisional conclusion and warns that age differences between vehicle fleets may affect comparisons.² “Less likely” is a useful assessment of the available evidence, not a lifetime guarantee for any individual car.
Why counting fires is harder than it sounds
The simplest comparison divides recorded fires by registered vehicles. That is better than comparing raw totals, but it can still mislead. Electric cars are, on average, younger than the long-established petrol fleet in many countries. Older vehicles may have had more time for deterioration, repair and damage. The populations may also differ in mileage, use and where they are parked.
Definitions create another problem. A fire in an electric car is not necessarily a battery fire. Upholstery, tyres or wiring can burn without the battery entering thermal runaway. Conversely, an incident involving a battery after a serious collision has a different cause from a fault during ordinary use. Counts that mix those cases cannot answer every question readers may have.
This is why confident claims that one propulsion type is “ten times safer” deserve inspection. What was counted? Over what period? Against what denominator? The UK government's cautious wording is more informative than a sensational ratio detached from its method.¹
What makes a battery fire different?
A lithium-ion battery stores energy inside many cells. If a cell is severely damaged or develops an internal fault, it may heat uncontrollably. Heat can spread to neighbouring cells in a process called thermal runaway, releasing flammable gases and sometimes sustaining or restarting a fire. UK recovery guidance describes the hazards of toxic fumes, high voltage and possible reignition.³
That does not mean every electric vehicle fire follows this path. A fire that has not involved the traction battery may behave more like another vehicle fire. The distinction matters to firefighters because cooling a battery pack can be difficult when its cells are enclosed beneath the vehicle. Essex Fire and Rescue Service describes both the challenge of reaching the source of heat and the need to monitor for renewed ignition.⁴
The US National Transportation Safety Board examined four high-voltage battery fires and found that three crash-damaged batteries reignited after firefighters had extinguished the vehicle fires.⁵ Four investigations cannot establish a population-wide fire rate. They do show why emergency response guides and post-fire handling matter for the incidents that do involve damaged batteries.
Petrol and diesel vehicles bring their own severe hazards: liquid fuel, hot engines and smoke from burning materials. The relevant comparison is not between a dangerous technology and a harmless one. It is between different probabilities and different kinds of response.
The car-park question
Confined spaces make fire planning especially important. Smoke, heat and access can turn any vehicle fire into a serious event in a covered car park. The government's review of electric-vehicle fire safety in such spaces looks at detection, ventilation, structural protection and firefighting access rather than relying on a blanket ban or a claim that batteries cannot burn.²
A sensible design question is therefore: if a fire starts, can people evacuate and can responders reach it? That question applies to mixed fleets. It also makes room for updated evidence as vehicles, battery designs and charging installations change. An older car park may need different improvements from a newly designed one, regardless of which propulsion technology receives the headlines.
Public claims about specific fires need the same care. The UK government notes that the widely discussed 2023 Luton Airport car-park fire was found by police to have started in a diesel vehicle, not an electric one.¹ Correcting that example is useful, but it should not be used to imply that electric-vehicle fires never occur. One investigated event cannot settle the general rate in either direction.
What drivers and responders can do
For owners, ordinary prevention includes following the manufacturer's charging instructions and attending to damage or warning messages. Professional inspection matters after a collision or when a battery is suspected to be compromised. If a vehicle is on fire or emitting suspicious smoke or vapour, the public-facing priority is to move away and call emergency services, not to attempt to diagnose its chemistry at the roadside.³
For responders, good vehicle-specific information is essential. The NTSB has called attention to gaps in emergency response guidance for battery incidents.⁵ Training, access to reliable instructions and safe storage after a fire are practical improvements. They are less dramatic than a viral clip, but more likely to reduce harm.
The balanced conclusion is not that electric-vehicle fires are imaginary, nor that they are uniquely common. Current evidence does not show they ignite more often than conventional cars, while battery involvement can create distinctive and demanding hazards. The honest comparison keeps both parts of that sentence together.