What to Do in the First 24 Hours of a Power Outage
In the first hour, keep your refrigerator and freezer doors closed, unplug sensitive electronics to protect them from power surges, and switch to flashlights instead of candles. Over the next 24 hours, your main jobs are managing food safety on a clock, charging what you can while you can, checking on anyone in the house who depends on electricity for medical needs, and keeping the home secure. This guide breaks that first day into time blocks so you always know what to do next.
Safety Warnings to Handle First
A few risks can turn a power outage into a medical emergency. Handle these before anything else on this list.
- Downed power lines: Stay away from any line on the ground or touching a fence, tree, or vehicle. Treat every line as live and call your utility company or 911 to report it.
- Carbon monoxide: Never run a generator, camp stove, or charcoal grill indoors, in a garage, or near a window. According to Ready.gov, generators and similar fuel-burning equipment should run outdoors and at least 20 feet from windows and doors. Install carbon monoxide detectors with battery backup if you don’t already have them.
- Home heating: Never use a gas oven or stovetop to heat a room. This is a leading cause of carbon monoxide poisoning during outages.
Hour by Hour: The First 24 Hours
Right Away (First 15 Minutes)
- Check whether the outage is just your home or the whole area. Look for neighbors’ lights or check your utility’s outage map.
- Unplug or turn off major appliances and electronics. Power can return with a surge that damages anything still plugged in.
- Keep one lamp or light switched on so you know when power is restored.
- Switch to flashlights. Skip candles, which are a fire risk, especially with kids or pets in the house.
- Keep refrigerator and freezer doors closed starting now. Every open-and-close resets the clock on how long food stays safe.
Hours 1 to 4: Protect Food, Charge What You Can
- Your refrigerator will keep food safely cold for about 4 hours if the door stays shut, per FoodSafety.gov. Use this window to top off phone batteries, power banks, and any device you’ll need later.
- If you have advance notice an outage is coming, this is also the point to fill coolers with ice and move highly perishable items like meat, dairy, and leftovers into a cooler as backup.
- Locate your first aid kit, medications, and a working flashlight for each household member so you’re not searching in the dark later.
- If you own a generator, set it up now, outdoors and away from windows, following the manufacturer’s instructions.
Hours 4 to 24: Manage the Freezer, Check on Medical Needs, Secure the Home
- Past the 4-hour mark, refrigerated perishables like meat, poultry, fish, eggs, and leftovers should be discarded if they’ve been above 40°F for more than 2 hours, per FoodSafety.gov guidance. When in doubt, throw it out — you cannot tell if food is unsafe by taste, smell, or appearance.
- A full freezer holds a safe temperature for about 48 hours if it stays closed; a half-full freezer holds for about 24 hours. Group items together to help them stay cold longer.
- If anyone in the household depends on refrigerated medication or powered medical equipment, this is the point to act. Ready.gov advises that if the power stays off for more than a day, medication that requires refrigeration should be discarded unless the label says otherwise, and that you should contact your doctor or pharmacist for a replacement supply. If someone relies on powered medical equipment, move to a location with power, such as a relative’s home or a community cooling or warming center, before the situation becomes urgent.
- As it gets dark, do a walk-through of your home’s entry points. Confirm doors and windows lock properly, and keep a charged flashlight near each exterior door. If you have an electric garage door, know how to release it manually so you’re not locked in or out.
- Check in with elderly neighbors or anyone who may need help, especially in extreme heat or cold.
- Keep monitoring official updates through a battery-powered or hand-crank radio if cell service is unreliable.
Extra Caution for Vulnerable Household Members
Infants, older adults, and anyone with a chronic health condition or a reliance on powered medical equipment face higher risk during an outage. Extreme heat or cold makes this worse. If someone in your home falls into one of these groups, plan to move them to a powered location sooner rather than later, and don’t wait until supplies or equipment run low to make that call.
Building a Kit for Next Time
Once the immediate outage is handled, it’s worth building supplies so the next one is less stressful. This includes backup power options sized to what you actually need to run, plus a stocked cooler and non-perishable food supply. Our Home Preparedness coverage walks through backup power systems, and our Emergency Food & Water coverage walks through food and water storage that holds up during longer outages. For the home security side of things, our Self Defense coverage includes a home security assessment checklist worth doing in daylight, before you ever need it.
Frequently Asked Questions
How long is food safe in the refrigerator during a power outage?
About 4 hours if the door stays closed, according to FoodSafety.gov. After that, perishables like meat, poultry, fish, eggs, and leftovers should be discarded if they’ve been above 40°F for more than 2 hours.
How long does a freezer keep food frozen without power?
A full freezer holds a safe temperature for about 48 hours. A half-full freezer holds for about 24 hours. Food that still has ice crystals or reads 40°F or below can generally be refrozen, though quality may suffer.
Is it safe to run a generator in the garage during an outage?
No. Generators produce carbon monoxide, which can be deadly in enclosed spaces. Ready.gov advises running generators outdoors, at least 20 feet from windows and doors.
What should I do if someone in my home depends on refrigerated medication or powered medical equipment?
Contact your doctor or pharmacist as soon as the outage starts to ask about your specific medication or device. Ready.gov notes that medication requiring refrigeration should generally be discarded if the power is out more than a day, unless the label says otherwise, and that a qualified clinician should guide any replacement or workaround. Do not start, stop, or change any medication or device use without professional guidance.
Educational Disclaimer
This article is for general education and is not medical, legal, or emergency management advice. Guidance here is drawn from Ready.gov and FoodSafety.gov and may not reflect your specific situation, local requirements, or the needs of vulnerable household members. For medical questions, including medication storage or powered medical equipment, talk to a qualified healthcare provider. See our Medical Disclaimer for more information.