A blackout, also known as a power outage, can strike at any time of year, though they're most common in winter when wind, ice, and storms hit hardest. Most outages are short, but some last days, weeks, or longer, and the difference between a minor inconvenience and a real emergency is preparation. This guide covers everything you need: what causes blackouts, how to prepare before one, exactly what to do during a blackout, what to do after the power returns, and the safety mistakes that send people to the hospital every year.

The short version: to handle a power outage, cover the essentials first, warmth and shelter, clean water, non-perishable food, light, and a way to stay informed, then add backup power and personal needs like medications. Here's how to do it right.

What Causes a Power Outage?

Power outages can happen anytime, sometimes even on a sunny day. Occasionally it's scheduled maintenance (call your utility if your phone works to check), but more often nature is involved. The most common causes:

• High winds, storms, and hurricanes. When the wind blows, trees and power lines come down. Thunderstorms, tornadoes, hurricanes, and even earthquakes all trigger outages.
• Blizzards and ice. Snow and ice weigh down trees and lines until they snap, and cars sliding off the road take out poles.
• High demand. Summer heat waves can overload the grid as air conditioning spikes demand, this is what causes a "brownout" (more on that below) and rolling blackouts.
• A problem at your home. Sometimes only your house loses power. Check whether your neighbors are affected before assuming the utility is on the way.

How to Prepare for a Power Outage (Before)

Outages are sudden and stressful, but they don't have to be dangerous if you've taken a few steps in advance. Build your plan around these essentials.

1. Have a Way to Stay Warm and Dry

People think first of food and water, but you can survive days without water and weeks without food, while hypothermia can kill in hours. Staying warm is the priority. Keep wool blankets and a high-quality emergency blanket on hand, along with warm layers. A clean, working fireplace with wood on hand is a great non-electric option. Never use a gas stove or oven to heat your home, and never bring outdoor heaters, grills, or generators indoors, both are leading causes of carbon monoxide poisoning.

2. Store Water That Won't Freeze

Sometimes water keeps flowing during an outage; sometimes it doesn't. Store at least one gallon per person per day for several days, bottled water or gallon jugs work fine, and rotate the stash so it stays fresh. Keep water filters and purification tablets on hand to treat natural sources, and remember you can boil water on a camp stove (outdoors) to purify it.

3. Keep Food That Doesn't Need Refrigeration

Stock a cabinet with dry, non-perishable foods, and for longer outages, freeze-dried meals. Keep a manual can opener. A practical trick: keep your freezer full (even with jugs of water), because a full freezer holds its temperature far longer, and those frozen jugs can move to the fridge to keep it cold.

4. Have Light You Can Count On

Lighting is where many kits fall short. Stock several flashlights and headlamps (headlamps keep your hands free), battery lanterns, and plenty of spare batteries. Use flashlights, not candles, candles are a major fire risk during outages, especially around children and pets.

5. Plan for Backup Power

Any working generator or battery beats none. Start small and scale up:

• Hand-crank and small solar devices, crank radios and solar chargers for a phone, flashlight, or GPS. Cheap and worth having.
• Portable battery power stations, can run a fridge, CPAP, or laptop, and pair with a solar panel to recharge.
• Portable gas generators, more power, no reliance on the sun; can keep a refrigerator running.
• Standby (built-in) generators, pricey, but in a rural area or for medical needs, you may barely notice the outage.

6. Stay Informed and Connected

Keep a battery or hand-crank radio for news if cell service fails, sign up for your utility's outage alerts, and keep power banks charged so your phone lasts. Know how to report an outage and where to find your utility's outage map.

7. Keep Emergency Supplies and Medications Ready

Keep a stocked first aid kit in the home, gauze, bandages, an emergency blanket, and basic medications. A first aid kit is essential year-round, not just for blackouts. Crucially, plan for anyone who depends on power for health: have a cooler and ice plan for refrigerated medicines like insulin, a battery backup for power-dependent medical devices (oxygen, CPAP), and ask your doctor about an extra supply of prescriptions if you live where outages are frequent. Keep your car's gas tank at least half full, since a blackout can signal a larger disaster and stations may be down.

What to Do During a Blackout

When the lights go out, work through this checklist:

• Keep the refrigerator and freezer closed. An unopened fridge keeps food safe for about 4 hours; a full freezer for about 48 hours (24 hours if half full). Every peek lets the cold escape.
• Unplug appliances and electronics. When power returns it can surge and damage TVs, computers, and motors. Leave one light on so you'll know when it's back.
• Use flashlights, not candles, to avoid fire.
• Run generators outdoors only, at least 20 feet from windows, doors, and vents, never in a garage or basement, even with the door open.
• Stay away from downed power lines. Keep at least 35 feet back, assume every line is live, and call 911.
• Manage temperature. In extreme heat or cold, go to a community cooling/warming center. Dress in layers; close off unused rooms to conserve heat.
• Conserve phone battery, lower brightness, close apps, and save it for emergencies and updates.
• Check on neighbors, especially older adults, young children, and anyone medically fragile.

What to Do After the Power Comes Back

• Check your food, "when in doubt, throw it out." Discard any perishable food that was above 40°F for 2 hours or more, and never taste food to test it. Food in the freezer that still has ice crystals or is at 40°F or below can be refrozen.
• Throw out refrigerated medications that went too long without cooling, and check with your pharmacist or doctor.
• Reconnect electronics gradually to avoid overloading circuits as everything powers up.
• Restock the water, batteries, food, and first aid supplies you used so you're ready for next time.
• Avoid flooded areas and don't use any electrical equipment that may have been submerged until an electrician checks it.

Power Outage Mistakes to Avoid

Many blackout injuries come from a handful of avoidable mistakes:

• Running a generator, grill, or camp stove indoors or in a garage (carbon monoxide is odorless and deadly, install battery-backup CO alarms on every floor).
• Using a gas oven or stovetop to heat the home.
• Relying on candles for light.
• Opening the fridge and freezer repeatedly.
• Leaving sensitive electronics plugged in during the outage.
• Going outside near downed lines or into floodwater.

Brownouts vs Blackouts: What's the Difference?

A blackout is a total loss of power. A brownout is a partial drop in voltage, your lights dim and devices may misbehave, usually when the grid is strained by high demand. During a brownout, unplug sensitive electronics and large appliances to protect them from the low-voltage and the surge when full power returns, and treat it as a warning that a full outage may follow.

Will There Be a Blackout Soon? Preparing for Grid Outages

As demand grows and extreme weather increases, many regions see more strain on the power grid, including planned rolling blackouts during heat waves or wildfire risk. You can't predict every outage, but you can stay ahead of it: sign up for alerts from your utility and local emergency management, watch for grid operator warnings (such as flex alerts asking you to conserve), and keep your kit ready year-round. Treating preparedness as a habit rather than a last-minute scramble is the best protection against a wider grid-down event.

Get Trained and Equipped

Gear is only half the equation, skills are the other half. Learn CPR and basic first aid, and teach your family, so you can respond if someone is hurt while help is delayed. Equip your home with a quality first aid and trauma kit, and don't forget a kit for your vehicle, here's our guide on how to build a car first aid kit and how to build a family first aid kit. Browse our full range of emergency equipment to round out your blackout supplies.

Frequently Asked Questions

How do I prepare for a blackout?

Cover the essentials: a way to stay warm, stored water (one gallon per person per day), non-perishable food, flashlights and batteries, a backup power source, a battery radio, a first aid kit, and a plan for medications and medical devices. Then sign up for your utility's outage alerts.

What should I do during a power outage?

Keep the fridge and freezer closed, unplug electronics to avoid surge damage, use flashlights instead of candles, run any generator outdoors at least 20 feet from the house, stay away from downed power lines, and check on vulnerable neighbors.

How long will food last in the fridge and freezer during an outage?

An unopened refrigerator keeps food safe for about 4 hours, a full freezer for about 48 hours (24 hours if half full). After that, throw out perishable food that's been above 40°F for 2 or more hours. When in doubt, throw it out.

How far should a generator be from the house?

At least 20 feet away, outdoors, with the exhaust pointed away from windows, doors, and vents. Never run a generator inside a home, garage, basement, or any enclosed space, carbon monoxide can build up fatally.

How do I survive a long-term blackout?

Prioritize warmth, water, and food, ration supplies, use backup power for essentials like medical devices and refrigeration, stay informed by radio, and relocate to a community shelter if temperatures become dangerous. Plan ahead for at least several days of self-sufficiency.

What's the difference between a blackout and a brownout?

A blackout is a complete loss of power; a brownout is a partial voltage drop that dims lights and can damage electronics. In a brownout, unplug sensitive devices and prepare for a possible full outage.

Conclusion: Blackout Preparedness

A short outage is no big deal, but a long one can be dangerous. Make sure you have a way to stay warm, access to clean water, a plan to keep food safe, reliable light, and backup power, plus a stocked first aid kit and the training to use it. Prepare before the lights go out, and a blackout becomes an inconvenience instead of an emergency.