Summer in Finland is not all sunshine. Thunderstorms, hurricanes and heavy rains, which have become more common in recent years, are also an increasing challenge for electrical systems. Climate change has made extreme weather events more intense and unpredictable – and at the same time increased their impact on the electrical systems of homes and properties.
In this blog, we will go over how thunderstorms and hurricanes affect electrical networks and devices, how you can prepare for them, and when it is worth calling an electrical professional for help.
Climate change is increasing extremism – also in Finland
As the climate warms, severe thunderstorms and storms are also becoming more common in our country. As a result of climate change, summers in Finland are becoming warmer and more unstable. Warmer air contains more moisture, which leads to more severe weather events. This increases the risk not only of power outages but also of damage to equipment, as weather conditions surprise both households and electricity networks.
Thunderstorms are occurring more frequently than before, even in areas where they were previously rare. In addition, storms can form more quickly and become more violent than before. Severe thunderstorms, in which the number of lightning strikes can reach hundreds of times per hour, are occurring more frequently. In addition, there may be torrential rains that can cause flooding even in urban areas, as well as gusty winds that can knock down trees and cut power lines. Such conditions often cause power outages and technical disruptions – sometimes even extensive and long-lasting. Proactive preparation is now more important than ever.
How do thunderstorms and storms affect electrical systems?
Electrical systems are vulnerable to extreme weather events. The most common impacts include:
1. Power outages
Thunderstorms and hurricanes are one of the biggest causes of power outages, especially in the summer. Falling trees, loose branches and flying objects can cut overhead lines or damage transformers. Especially in sparsely populated areas, power lines are often overhead, which makes them vulnerable to the effects of weather phenomena. When power goes out, it affects not only lighting and household appliances, but also critical systems such as water pumps, heating and telecommunications. In the worst case, power outages can last for several hours or even days if repairs are difficult due to weather conditions or the damage is extensive.
2. Overvoltage damage
Lightning strikes can cause momentary but powerful voltage spikes in the electrical network, which quickly spread to the electrical systems of houses and buildings. Such overvoltage can damage electrical equipment in a fraction of a second. Electronic devices such as computers, televisions, household appliances and various control units – for example, heat pumps and smart home systems – are particularly sensitive to overvoltages. Even if lightning does not strike a property directly, it can hit a nearby power line or transformer and still cause significant damage to the internal network. The lack of surge protection is still one of the most common reasons for damage to electrical equipment during thunderstorms.
3. Grounding problems
Grounding is an essential part of electrical system safety, but it can also be put to the test during heavy rains and floods. If the surrounding ground suddenly becomes saturated with water or floods, the grounding can lose its effectiveness or become uneven. This can cause dangerous situations or disruptions to the operation of electrical equipment. For example, electrical systems with outdated or inadequate grounding can be more susceptible to damage. Voltage fluctuations during a thunderstorm can also be more dangerous if the grounding does not work as it should. Therefore, checking the condition of the grounding and, if necessary, improving it is an important part of storm preparedness.
4. Power grid load
Although thunderstorms and storms are the most visible risks, prolonged heat waves can also affect the electricity grid. As temperatures rise, electricity consumption increases – especially if a lot of air conditioning or cooling equipment is used. This can overload the electricity grid, especially in densely populated areas. In hot weather, cables also heat up faster, which can weaken their electrical conductivity and increase the risk of faults. Although Finland is not yet used to the electricity grid being overloaded in the summer, this phenomenon may become significantly more common in the future due to climate change. Therefore, grid sustainability and consumption forecasting are also important during the summer months.
How to prepare for emergencies at home and in your property
✔ Get a surge protector
Install surge protectors, especially for important devices (e.g. heat pumps, IT, refrigerators).
✔ Unplug devices during thunderstorms
When lightning is approaching, it is a good idea to completely unplug sensitive devices from the outlet.
✔ Be prepared for power outages
Keep flashlights, batteries, a power bank, a radio with spare batteries, and drinking water on hand.
✔ Consider backup power
Especially on farms or in businesses, a backup power device can save the day. During a power outage, a generator can keep frozen food cold or a water pump running, for example.
✔ Be mindful of the environment
Clear trees near power lines and make sure that branches do not threaten lines or buildings in high winds.
When should you call an electrical professional?
It is a good idea to have electrical systems inspected, maintained, and protected well in advance of the thunderstorm season. A professional can help:
- install surge protectors correctly,
- to check the condition of the grounding,
- to design and install a backup power system safely,
- assess system vulnerabilities and update old electrical panels to meet current requirements.
24 Center helps quickly and easily
24 Center offers a quick and easy way to order an electrical professional on-site – whether it's an acute emergency after a storm or proactive preparation for the thunderstorm season.
You can submit a service request online or call us – we’ll take care of the rest. Just one call and an expert will be on their way.
It's always worth being prepared – the weather can surprise you, but you can be one step ahead.
Do you need an electrician for a storm inspection or to install surge protection?
👉 Contact 24 Center today!
