Electrical substation fires can cause a significant amount of damage, and it’s imperative that businesses make every effort to avoid the risk of them happening. But, with many notable instances of them occurring in recent years, what is it that makes these incidents so common and so costly? In this blog, we discuss the cause of electrical substation fires, their impact on businesses and individuals, and what can be done to prevent them from occurring.
The Impact of Electrical Substation Fires
There have been many noteworthy examples of electrical substation fires in past years that have highlighted the catastrophic impact that they can have.
In March of 2025, Heathrow Airport made headlines for its 16-hour power outage caused by a substation fire. This had a significant impact on their operations, with over 1,000 flights grounded, over 200,000 passengers affected, and a cost of tens of millions of pounds.
In the following month, a substation fire in Kidderminster left 1,600 homes without power at the fire’s peak. Then, in May 2025, 400 homes near Romsey were also left without power as a result of a similar incident. At their worst, a substation fire in Leicester in March 2017 caused 45,000 properties to be powerless.
With electrical substation fires being an alarmingly common occurrence and their impact being so detrimental, what is it that leads to these incidents, and how can they be prevented?
What Causes Electrical Substation Fires?
There are many reasons why electrical substation fires can occur, though these are often preventable. The most common causes of these fires include:
Equipment Faults and Component Failure
Over time, electrical components such as transformers, circuit breakers, and switchgear can deteriorate through wear, corrosion, or insulation breakdown. When insulation fails or contacts loosen, arcing can occur, with an electrical discharge generating enough heat to ignite surrounding materials.
Overloading and Overheating
Substations handle fluctuating loads throughout the day. When equipment is operated beyond its capacity, excessive heat builds up within the transformers and cables. If this heat isn’t dissipated effectively, it can cause oil-based cooling systems to degrade or ignite, leading to potentially severe fires.
Poor Cable Management or Insulation Damage
Inadequate separation, mechanical damage, and environmental factors such as water ingress (one of the causes of the Heathrow fire) can compromise cable insulation. When exposed conductors come into contact, short circuits or arcing faults can occur.
Human Error
Human error remains one of the most common causes of substation incidents. Incorrect isolation procedures, faulty connections, and insufficient inspection regimes can all lead to the risk of ignition.
Ageing Infrastructure
Many substations across the UK are operating well beyond their original design life. Outdated equipment and materials may not meet modern safety expectations or withstand today’s demand levels. In fact, the transformer that tripped during the Heathrow incident was commissioned in 1968.
How Can Electrical Substation Fires Be Prevented?
Although various problems can lead to a substation fire, there are many proactive solutions that significantly reduce the risk of one happening and ensure that your substation operates not only safely but also efficiently. Substation fires can be prevented by:
Safe Installation
The construction of a substation that is designed with preventative safety measures from the beginning is a major factor in avoiding fires. With safe substation installation, equipment will be chosen that will comfortably handle the expected load, safe cable spacing will be accounted for, and proper ventilation and fire barriers will be implemented. The use of modern, fire-resistant materials and well-rated components will also reduce the risk right from the outset.
Regular Maintenance
Maintenance can occasionally be overlooked by some organisations, but doing so can lead to disasters such as the Heathrow substation fire. As a result, regular substation maintenance helps to prevent smaller problems from going unnoticed and presenting much more costly consequences later down the line.
Substation maintenance involves the full inspection of a substation and the repair of any issues that could become a problem later on. By catching these early, the risk of a fire is largely reduced.
Environmental Management
Not only do the internal components matter, but external factors are also important to keep on top of in preventing substation fires. Substations should be kept clear of vegetation, debris, and any other flammable objects, with proper drainage and weather protection in place. Clean, well-kept sites are not only safer, but they’re also easier to inspect and maintain.
Skilled Personnel and Safe Practice
As human error is still a leading factor in many incidents, regular training, clear safety protocols, and strict adherence to industry standards help engineers to work safely and consistently. Consistency in how teams operate helps to prevent the kinds of oversights that lead to incidents.
Safe Substation Installation and Maintenance at Serconnect
Despite the frequency of electrical substation fires and their potentially detrimental consequences, they can be largely avoided by ensuring that your equipment is designed and operated safely and is properly maintained.
To ensure your equipment is dependably safe, we offer a range of services as an accredited Independent Connection Provider to assist you. Choosing our substation installation service means that we will efficiently and safely design and set up a substation at your site to operate reliably for years to come. Our substation maintenance then helps to detect any hidden issues and resolve them for continued safe operation.
If you’d like to find out more about our offerings for the installation and maintenance of electrical infrastructure, contact us today. A member of our team will be more than happy to discuss potential options with you.
