In Rolling Blackouts, Whole-Home Surge Protection Is Your Ally

Most Fresno homeowners think about a power outage the same way: the power goes out, and then the power comes back. But, actually, when electricity is cut to an area and then restored, it does not flow back smoothly. Wiring that was empty of current experiences a sudden rush of electricity filling every conductor at once, and for a brief moment, the voltage can spike well above the normal threshold your appliances and electronics were built to handle. That spike is called a power surge, and it can damage or destroy anything plugged in when it hits. For Fresno homeowners in PG&E’s service area, where Public Safety Power Shutoffs have affected Fresno County repeatedly over recent years, this is not a theoretical risk. It is a recurring one that happens with every rolling blackout. Whole-home surge protection is what stands between that surge and everything in your home that could be damaged in a rolling blackout (whether it’s from PGE or other factors).

How Rolling Blackouts Create Surge Risk

California utility companies, including PG&E, are authorized by the California Public Utilities Commission to initiate Public Safety Power Shutoffs (PSPS) procedures when wildfire risk conditions are severe: high winds, low humidity, and dry vegetation that could ignite if electrical equipment arced or failed. Fresno County has been included in PSPS events multiple times, particularly during the dry, windy periods that define Central Valley fire weather season from late spring through fall.

The shutoff itself is not what damages your home. What damages your home is what happens when the utility company restores power. As electricity flows back into lines that were fully de-energized, the current rushes in rapidly to fill empty wiring throughout the grid. That inrush can produce a voltage spike well above the 120-volt standard that household wiring and appliances are designed to accept. Research confirms that restoration surges can momentarily drive line voltage to 200 volts or more, a level sufficient to damage or destroy sensitive electronics and the control boards inside major appliances.

PSPS events are not the only source of this risk. Standard outages from summer storms, downed lines, or grid fluctuations carry the same restoration surge dynamic. Any time power is interrupted and restored, the potential for a surge is present. In a region like Fresno, where summer temperatures drive heavy air conditioning use and where the grid can be stressed by heat and fire weather simultaneously, these events are simply part of the landscape.

What a Power Surge Actually Does to Your Home

The damage a surge causes depends on its size and what it reaches. Small, frequent surges, the kind that happen invisibly when high-draw appliances like your AC compressor or refrigerator cycle on, accumulate over time and degrade the internal components of electronics gradually, shortening their lifespan without causing any single dramatic failure. Larger surges from utility events can be immediately destructive.

The appliances and systems most at risk are the ones that contain sensitive electronics: computers, televisions, gaming consoles, smart home devices, and, critically, the control boards inside HVAC units, refrigerators, washers, dryers, and dishwashers. Modern HVAC systems in particular are heavily computerized: the thermostat, the variable-speed blower motor, the compressor controls, and the communication systems between indoor and outdoor units are all managed by circuit boards that are vulnerable to voltage spikes. Replacing an HVAC control board can run several hundred dollars; replacing the unit itself can run several thousand.

What makes this especially relevant for Fresno homeowners is that the appliances most likely to be running when a PSPS restoration occurs are the largest ones: air conditioners operating during summer heat events, refrigerators running continuously, washer and dryer cycles left mid-run. These are not devices plugged into a power strip by your desk. They are hardwired or plugged directly into wall circuits with no surge protection at all, unless a whole-home device is installed at the panel.

The Difference Between a Power Strip and Whole-Home Surge Protection

This distinction matters enough to address directly, because many homeowners believe they are covered when they have plug-in surge protectors on their televisions and computers. Those devices do offer some protection for what is plugged into them. But they address only part of the problem, and they leave the most expensive systems in your home completely exposed.

What plug-in surge protectors do

A plug-in surge protector sits between a wall outlet and the devices connected to it. It contains components that absorb excess voltage up to a rated limit, measured in joules, and divert it away from connected devices. For a desktop computer, a television, or an entertainment center, a quality plug-in surge protector provides meaningful protection against moderate surges.

What it cannot protect: anything not plugged into it. Your HVAC system. Your refrigerator. Your washer and dryer. Your smart thermostat. Any outlet in your home that does not have a surge protector plugged into it. A restoration surge from a PSPS event does not just travel down the one circuit you remembered to protect; it reaches every outlet, every hardwired appliance, and every piece of electrical equipment connected to your home’s wiring simultaneously.

What whole-home surge protection does

A whole-home surge protector, installed by a licensed electrician directly at your main electrical panel, intercepts voltage spikes before they enter your home’s wiring system. Every circuit in your home is protected: the outlet your refrigerator is plugged into, the wiring connected to your HVAC system, the circuits serving your washer and dryer, and the outlets in every room. When a restoration surge comes in from the utility, the whole-home device absorbs and diverts it at the panel, before it reaches any of your equipment.

According to the National Electrical Manufacturers Association, up to 80 percent of all power surges originate from inside a home, from large appliances cycling on and off. A whole-home device handles those too. Point-of-use strip protectors only catch what passes through them and can’t defend against the internal surges that degrade electronics gradually over time.

Electrical experts consistently recommend a layered approach: whole-home protection at the panel as the first line of defense for all circuits and hardwired appliances, combined with quality plug-in surge protectors at workstations and entertainment centers for the most sensitive devices.

What Is Already Protecting Your HVAC System?

This is a question worth asking directly. If you have central air conditioning in your Fresno home, and if that system is not connected to any surge protection device, the control board inside your air handler and the compressor controls in your outdoor unit are exposed to every utility surge event that reaches your home.

During a summer PSPS event, the sequence that creates maximum risk looks like this: PG&E initiates a shutoff during a heat event. Your AC shuts off suddenly mid-cycle. Temperatures inside your home climb. When PG&E restores power after inspecting and clearing the lines, a restoration surge travels through your wiring and reaches your AC system, which is now drawing power again immediately as it attempts to restart in a hot house.

A whole-home surge protector interrupts that sequence. The surge is absorbed at the panel and never reaches the AC system’s electronics. Without one, the outcome depends on the size of the surge and the luck of that particular restoration event.

Frequently Asked Questions

Does my homeowner’s insurance cover surge damage?

Coverage varies significantly by policy. Some policies cover sudden and accidental damage from power surges; others exclude surge damage explicitly or impose limits. Progressive notes that surge damage to electronics and appliances can, in some cases, be covered under personal property provisions, but deductibles and exclusions often apply. Checking your policy and asking your insurer directly is the only reliable way to know your coverage. Whole-home surge protection is a far simpler and more predictable form of defense than navigating a claim after the fact.

How is a whole-home surge protector installed?

A licensed electrician installs the device directly at your main electrical panel. The installation typically takes less than an hour and does not require any changes to your home’s wiring. The device connects to your panel’s main breaker and monitors incoming voltage continuously, activating whenever a spike exceeds safe levels.

Do whole-home surge protectors wear out?

Yes. The components inside surge protection devices absorb energy each time they activate, and that capacity diminishes over time. Most manufacturers recommend replacement every few years, or after a significant surge event. Some devices include an indicator light that signals when the protective components are no longer functioning. An electrician can inspect and replace the device as part of routine electrical maintenance.

If I already have plug-in surge protectors on my electronics, do I still need whole-home protection?

Yes, for two reasons. First, plug-in protectors do not cover your HVAC system, refrigerator, washer, dryer, or any hardwired appliances. Second, a large restoration surge from a utility event can exceed the joule rating of a standard plug-in device, overwhelming its protective capacity entirely. Whole-home protection handles the large surge before it reaches the plug-in device, which then serves as a secondary layer of protection for the most sensitive equipment connected to it.

Is a PSPS the only time I need to worry about surges in Fresno?

No. Any power outage, including those caused by summer storms, downed lines, equipment failures, or grid fluctuations, carries restoration surge risk. Additionally, the internal surges from large appliances cycling on and off in your home occur constantly and contribute to gradual component wear on your electronics and HVAC equipment. Whole-home surge protection addresses all of these, not just utility shutoff events.

Protect What Powers Your Home Before the Next Shutoff

Rolling blackouts in Fresno are not a new phenomenon, and they are not going away. PG&E’s Public Safety Power Shutoff program is a permanent feature of California’s utility landscape during fire weather season, which runs through the same months your air conditioning runs hardest. The next PSPS event in Fresno County is a matter of when, not if.

Whole-home surge protection is one of the simplest and most effective investments a homeowner can make in the electrical safety of their home. It protects the appliances and systems you rely on most, including your HVAC, and it works transparently from the moment it is installed. Allbritten’s licensed electricians install whole-home surge protectors for Fresno-area homeowners. Call us or schedule an appointment online to get started.