What should I do after a power surge?

First, make the house safe before you reset anything

After a power surge, your first job is to reduce fire risk and stop damaged electronics from being energized again. Do not start by repeatedly flipping breakers or plugging devices back in to see what happens. A surge can damage power supplies, appliance control boards, GFCI receptacles, smart switches, doorbell transformers, furnace boards, garage door openers, and chargers in a way that is not obvious from the outside.

Start with the rooms that were affected when the surge happened. In Ontario, we often see this after lightning nearby, a storm outage, a utility switching event, a downed neutral, or power returning after an outage. The damage may be limited to one branch circuit, or it may show up across the house on electronics with sensitive boards.

Do this right away:

• Unplug TVs, computers, modems, routers, game consoles, chargers, smart speakers, and damaged small appliances.
• If a device sparked, popped, smoked, or now smells burnt, leave it unplugged.
• Do not use an outlet or switch that is hot, buzzing, discoloured, cracked, or has a burnt-plastic smell.
• Check for lights that suddenly became unusually bright or dim, especially if it happened across several rooms.
• If you smell burning from the panel, hear arcing, or see smoke, stop and call for emergency electrical help.
• If the whole home is out while neighbours have power, read why only your house may be without power and call the utility if the service feed or meter may be involved.

If the surge followed a storm, stay away from fallen service wires, metal mast parts, and any wet electrical equipment. A wet panel, damaged meter base, or service mast issue is not a homeowner reset problem. That is utility and licensed electrical contractor territory.

Check the breakers once, then stop if they will not hold

You can check your breaker panel after the surge, but reset a tripped breaker only once. A breaker that trips again is doing its job. Forcing it back on can energize damaged wiring, a failed appliance, or a shorted surge-damaged component.

At the panel, stand on a dry floor, use one hand where possible, and do not remove the cover. Look for breakers that are in the middle position or visibly off. Many breakers need to be switched fully off before being turned back on. If a breaker resets and the circuit behaves normally, continue watching it. If it trips again, leave it off.

Use this quick sorting guide:

A surge does not always trip a breaker. Breakers respond to overcurrent, not every voltage spike. A short, high-energy transient can pass through a panel and damage electronics without leaving the breaker handle in the tripped position.

If only one room lost power after the event, the cause may be a tripped breaker, failed GFCI/AFCI device, damaged receptacle, or connection problem. See why one room loses power for that narrower symptom. If the issue is house-wide, especially with unusual voltage symptoms, do not treat it like a normal room outage.

Inspect the likely surge victims before plugging them back in

Before you restore your normal setup, inspect devices that were connected at the time of the surge. Surge damage often appears as a dead adapter, a device that powers on but behaves erratically, a burnt smell from a power bar, or a GFCI receptacle that will not reset.

Pay attention to equipment with electronics inside, not just computers. Modern homes have control boards everywhere: furnaces, boilers, range controls, laundry machines, dishwashers, garage door openers, security systems, intercoms, irrigation controllers, smart dimmers, video doorbells, EV chargers, and low-voltage lighting transformers.

A practical restart order is:

• Leave visibly damaged devices unplugged.
• Plug essential items back in one at a time.
• Avoid overloaded power bars while testing.
• Replace any power bar that shows heat damage, melted plastic, a failed indicator light, or a burnt smell.
• Check GFCI outlets in kitchens, bathrooms, garages, basements, and outdoors.
• Watch low-voltage systems, including modems, routers, doorbells, and security hubs, for intermittent failure over the next few days.

Do not use a space heater, dehumidifier, sump pump, freezer, or other higher-load appliance on a questionable receptacle after a surge. If a plug fits loosely, the cover plate is warm, or the outlet face looks browned, stop using it until it is checked. Surge damage and loose connections are different problems, but either can overheat under load.

Video doorbells and smart chimes are a common post-surge headache because the transformer, chime kit, and device electronics are all exposed through low-voltage wiring. If that is the only device failing, compare your symptoms with why a video doorbell loses power. If multiple low-voltage devices failed together, the panel grounding and surge path deserve a closer look.

Take photos of damaged electronics and note the time of the outage or storm. If you speak to your utility or insurer, that timeline helps separate a building wiring issue from a broader utility event.

Book an electrical check if there are heat signs, repeated trips, or multiple failures

You should book an electrical inspection after a surge when there is any sign of heat, repeated tripping, damaged outlets, service-voltage symptoms, or multiple failed devices. The goal is not just to replace the dead gadget. It is to confirm the panel, grounding, bonding, neutral path, and affected branch circuits are still safe.

A post-surge electrical check may include:

• Opening the panel safely to look for heat marks, loose terminations, damaged breakers, and stressed neutral connections.
• Checking the grounding and bonding path so a future surge has a proper route away from equipment.
• Testing affected receptacles for correct polarity, grounding, and GFCI operation.
• Looking at outdoor circuits, garage circuits, and basement circuits where moisture and long wire runs make surge effects more noticeable.
• Checking smart switches, dimmers, doorbell transformers, low-voltage transformers, and equipment disconnects that were affected.
• Verifying whether any repair or replacement work needs an ESA notification and inspection under Ontario rules.

This is especially important if lights became brighter during the event, not just off. Unusual brightness can point to a neutral problem, and a damaged or loose neutral can put unsafe voltage on 120V loads. That can destroy electronics quickly and create shock or fire hazards.

For City Power service in Toronto and the GTA, Sam’s team can assess surge damage, provide a free written estimate, and file ESA notifications where required under ECRA/ESA licence #7015314. If the home is unsafe, treat it as urgent rather than waiting for more devices to fail.

Add whole-home surge protection if the home has sensitive electronics or repeat events

A whole-home surge protection assessment is the right next step after a damaging surge, especially if you have smart devices, a newer furnace board, an EV charger, a home office, a standby generator, or expensive appliances. Plug-in strips help at individual devices, but they do not protect hardwired equipment or the service-side exposure at the panel.

A panel-mounted surge protective device is installed at the electrical panel so it can clamp voltage spikes before they travel deeper into the home. It does not make a house lightning-proof, and it cannot repair weak grounding or a bad neutral. It is one layer in a proper protection plan, along with good grounding, correct bonding, quality receptacles, and point-of-use protection for computers and media equipment.

Installed pricing for a panel surge protector is generally $400–$700. The final quote depends on the panel space, breaker requirements, device type, access, and whether other panel issues have to be corrected at the same time. If the panel is full, obsolete, damaged, or poorly labelled, the assessment may also identify work that should be handled before or during the installation.

A good surge assessment should answer these questions:

• Is there room in the panel for the surge device and its required breaker or connection method?
• Is the panel in good condition, with no overheating or corrosion?
• Is the grounding electrode and bonding arrangement intact?
• Are sensitive loads grouped in a way that makes point-of-use protection worthwhile?
• Did the surge come from a utility event, storm exposure, a generator connection, or a building wiring fault?
• Does the work need ESA notification and inspection?

If you are deciding whether the upgrade makes sense before a failure happens again, read whether whole-home surge protection is worth it. If you are ready to have the panel assessed and protected, our whole-home surge protection service explains the installation path.

The important point after a surge is sequence: make it safe, restore power carefully, document damage, inspect anything hot or burnt, then add protection before the next storm or utility switching event tests the system again.