Most power outages are short. In a normal year, the average U.S. customer loses only about two hours of power, usually across one or two interruptions, according to the U.S. Energy Information Administration once major storms are set aside. Count the storms back in and the 2022 average rises to about five and a half hours for the year. The big swings come from major weather: in 2024, hurricanes pushed the national average all the way to 11 hours.
So the honest answer is that a typical single outage runs from a few minutes to a couple of hours, while a bad storm can mean days. Below is how those numbers break down, why your region matters, and what a realistic outage length means when you size backup power.
⚠️ These are averages, not guarantees
The figures here are national and state averages from the EIA. Your own outages depend on your utility, your weather, and where the fault happens. A single storm can put your home well past any average, which is exactly why backup power is sized for a realistic worst case, not for a typical year.
How long a typical outage lasts
The EIA tracks reliability with two numbers utilities report each year. SAIDI, the System Average Interruption Duration Index, is the total minutes of interruption the average customer sees in a year. SAIFI, the frequency index, is how many of those interruptions they see. Both count only non-momentary outages, generally those lasting five minutes or longer, so a brief flicker when a line recloses never shows up in the totals.
Strip out the major weather events and the picture is steady. The EIA notes that since 2013, the average customer’s outage time has held at around two hours a year, spread across roughly one to one and a half interruptions. Divide one into the other and a routine single outage lands somewhere between a few minutes and about two hours. Most are at the short end: a tripped feeder, a blown transformer, or a car into a pole, fixed by a crew the same morning.
That is the outage most households actually experience in a given year. It is short enough that a charged phone, a flashlight, and a small battery cover it without much fuss. The longer ones are a different animal.
When storms cause multi-day outages
Almost all of the long outages come from major events: hurricanes, ice storms, derechos, and wildfires. The EIA reports these separately because they distort the average so heavily. In 2022, of the roughly five and a half hours the average customer went without power, about three and a half came from major events. The routine two hours barely moved; the storms did the rest.
2024 made the point in bold. The national average jumped to 11 hours, the most in a decade, and the EIA attributes 80% of that lost time to Hurricanes Beryl, Helene, and Milton. Interruptions from major events averaged nearly nine hours that year, against an average of nearly four hours a year across 2014 through 2023. For the homes directly in the path of those storms, the real outage was not nine hours but several days, while crews rebuilt downed lines and waited for floodwater to drop.
This is the gap that matters for planning. A multi-day outage is uncommon in any single year, but it is the scenario that ruins a freezer full of food, drains medical-device batteries, and leaves a well pump dead. The average says hours; the bad day says days.
Why outage length varies by region
Curious where your state lands? We ranked all 50 states and DC by hours without power in our power outage statistics by state breakdown, built on the latest EIA reliability data.
National averages hide a wide spread. In the EIA’s state-level data, a customer in a dense, low-storm state may see well under two hours of outage a year, while customers in heavily forested or hurricane-exposed states routinely see many times that. A few things drive the difference:
- Weather exposure. Gulf and Atlantic coasts take hurricanes; the Midwest takes derechos and ice; the West takes wildfire and public-safety power shutoffs. More severe weather means more long outages.
- Overhead versus underground lines. Buried distribution lines are far less exposed to wind and falling trees. Dense urban areas with underground wiring tend to post the lowest outage times.
- Vegetation and terrain. Rural lines that run for miles through trees have more to hit them and take longer to reach and repair than a city block.
- Grid age and crew density. Older equipment fails more often, and a sprawling rural service area means longer drive times to each fault.
The practical takeaway: your own history beats any national figure. If your neighborhood loses power twice a winter for half a day each time, plan around that, not around the two-hour national average.
What outage duration means for backup power
Duration is the single biggest input when you size backup power, because it decides how much stored energy you need, not just how much power. A device’s wattage sets how big a battery or inverter has to be to turn it on; the length of the outage sets how many watt-hours you have to store to keep it running. A power station that easily runs your fridge for three hours may run flat overnight.
The table below maps common outage scenarios to a rough duration and the kind of backup that fits. Match the row to the outage you actually expect, then size up one step if you live somewhere storms are routine.
| Scenario | Typical duration | Backup power need |
|---|---|---|
| Brief flicker or momentary blip | Seconds to a few minutes | Surge protector or small UPS for electronics; nothing larger |
| Routine outage (equipment fault, single feeder) | Minutes to about 2 hours | Small power station or UPS for phones, Wi-Fi, and a few lights |
| Common storm outage | Several hours to overnight | Mid-size power station to keep a fridge, lights, and devices going |
| Major storm, hurricane, or ice storm | 1 to several days | Large power station with solar recharging, or a generator |
| Extended regional event | Multiple days to a week or more | Generator or large battery plus solar, with stored fuel and water |
The jump from the third row to the fourth is where most backup plans fall short. A unit chosen for an overnight outage often will not carry a home through a two-day storm without a way to recharge, which is why solar input or a generator becomes the deciding feature once you plan past 24 hours.
Put a number on your own outage
Once you have a realistic duration in mind, the rest is arithmetic. Use the Power-Station Sizing calculator to find the capacity that covers your target outage length for the appliances you care about, then check a specific model with the Appliance Runtime calculator to see how many hours it would actually run your fridge, CPAP, or Wi-Fi. Plug in the duration from the table above, and you stop guessing whether a unit is big enough for the outage you are likely to face.
Frequently asked questions
How long do most power outages last?
Most are short. In a normal year, after major storms are set aside, the average U.S. customer’s total outage time is about two hours, usually across one or two interruptions, per the EIA. That means a single routine outage often runs from a few minutes to a couple of hours.
What is the average power outage duration in the US?
The EIA reported the average customer experienced about five and a half hours of interruptions in 2022, counting all events. Major-weather years run higher: 2024 averaged 11 hours, the most in a decade. Without major events, the figure has held steady around two hours a year since 2013.
How long can a power outage last after a major storm?
Days, in the hardest-hit areas. Major events drive almost all of the long outages. The EIA attributed 80% of 2024’s lost power time to three hurricanes, and homes directly in their path waited several days for restoration while crews rebuilt downed lines.
Why do some areas have much longer outages than others?
Weather exposure, line type, and vegetation. Coastal hurricane zones and heavily forested, rural regions see far more long outages than dense urban areas, where underground lines are better shielded from wind and falling trees. Your local history is a better guide than the national average.
How long should my backup power last during an outage?
Size for your realistic worst case, not the average. A few hours of runtime covers most routine outages, but if you live somewhere storm- or hurricane-prone, plan for one to three days and add a way to recharge, such as solar panels or a generator. Run your numbers in the sizing and runtime calculators to confirm.
Sources
- U.S. Energy Information Administration – U.S. electricity customers averaged five and one-half hours of power interruptions in 2022
- U.S. Energy Information Administration – Hurricanes in 2024 led to the most hours without power in the United States in 10 years
- U.S. Energy Information Administration – How often do electric power outages occur in the United States? (SAIDI and SAIFI)
- U.S. Energy Information Administration – Electric Power Annual (reliability tables)