What Is a Power Flash in a Hurricane? | Others Electric

If you have lived through a Florida hurricane, you have probably seen it. A blue or green flash lights up the sky, sometimes followed by a boom. A few seconds later, the lights in your neighborhood go out. That is a power flash, and it happens multiple times across the power grid during every major storm that hits Palm Beach County and the Space Coast.

Here is what it is, what causes it, and what it means for your home.

What Causes a Power Flash?

A power flash is what happens when a high-voltage component on the power grid fails suddenly and releases energy as light. The most common cause is a transformer failure. Utility transformers are the cylindrical cans you see mounted on power poles throughout Florida neighborhoods. They step down the high voltage on the distribution line to the 120/240 volts that goes into your home.

When a transformer floods, gets struck by a falling tree or debris, or is hit by a lightning surge that overwhelms its protection, it can fail with a short-circuit arc. That arc superheats the surrounding air and transformer oil instantly. The result is a flash of bright light, sometimes blue, sometimes green, sometimes white, depending on the materials involved.

Transformers are not the only cause. Downed power lines contacting each other, equipment failure at substations, and lightning strikes directly to distribution lines can all produce power flashes.

Is a Power Flash Dangerous?

The flash itself is not a direct threat unless you are standing near the transformer when it fails. The real danger is what follows.

When a transformer fails, it typically takes out power to a section of the grid. If your home was running on grid power and loses it suddenly during a storm, any devices without surge protection are exposed to the voltage spike that precedes the outage. Sensitive electronics, including refrigerators with digital controls, HVAC equipment, and anything plugged into a standard outlet, are vulnerable to that transient surge.

When power is restored after a storm outage, it is not always clean. Voltage irregularities during restoration are common, and they can damage equipment that survived the outage itself. This is why whole-home surge protection matters, not just power strips.

What Does a Power Flash Mean for Your Home in Florida?

If you see a power flash and your power goes out, the first thing to do is turn off or unplug sensitive appliances. The bigger concern comes when power is restored. At that point, your equipment is exposed to the restoration surge.

If your home has a whole-home surge protector installed at the panel, it absorbs that transient voltage before it reaches your devices. If it does not, each piece of equipment takes the hit directly.

In Palm Beach County and on the Space Coast, we install surge protectors at the panel as a standard part of generator installations. Florida building code now requires one with any new panel installation. If your home does not have one and your area took a hit during the last storm season, it is worth adding.

The Case for a Standby Generator After Watching Power Flashes

Power flashes mean transformer failures. Transformer failures mean extended outages. After a direct hit in our service area, FPL and Duke Energy may take days or weeks to restore power to all customers. Crews have to physically replace transformers on damaged poles throughout the affected grid, and residential neighborhoods often wait behind hospitals, utilities, and major roadways.

A Generac standby generator detects the outage within seconds and switches your home to backup power automatically. You do not flip a switch. You do not run extension cords. The generator starts, the automatic transfer switch isolates your home from the grid, and your home continues running.

In a Florida summer with no AC and no refrigeration for a week, that is not a luxury. It is the difference between staying home and evacuating to a hotel.

Others Electric Installs Generators and Surge Protection in Palm Beach County and Brevard County

We are an authorized Generac dealer and licensed electrical contractor serving West Palm Beach, Boca Raton, Delray Beach, Wellington, Palm Bay, Melbourne, Rockledge, and the surrounding areas. We install whole-home standby generators, automatic transfer switches, and panel-mounted surge protection.

If the last storm season left you thinking about backup power, call us before the next one forms.

Call us at (561) 567-7929 or request a free estimate at otherselectric.com.