Power Outage Checklist: Before, During & After

Most people discover their power outage preparedness gaps during the outage itself — the flashlight with dead batteries, the phone that died, the fridge full of food they have to guess about on day two.

This checklist removes the guesswork. It covers every phase: what to have before the grid fails, what to do in the first minutes and hours after it does, and how to safely recover once power returns.

Phase 1: Before — Supplies and Home Prep

The supplies that matter are not the ones you buy after the storm warning. They are the ones already in your house when the lights go out.

Lighting and Power

Flashlights — at least one per floor, fresh batteries installed (not stored loose in the drawer alongside the flashlight)
Headlamps — one per person; headlamps beat handheld flashlights for any task that requires two hands
Spare batteries — AA and AAA in sealed packaging; rotate yearly
Charged power banks — a 10,000–20,000 mAh battery bank keeps phones and small devices running for days; keep it topped off as part of your weekly routine
Battery or hand-crank emergency radio — local emergency alerts, weather updates, and utility restoration news require a radio that works when cell towers are overloaded or down

Food and Water

72-hour food supply — shelf-stable items that require no cooking or minimal prep: peanut butter, crackers, canned beans, granola bars, canned tuna, dried fruit
Manual can opener — your electric can opener is useless; a simple lever-style manual opener costs under $5 and belongs in every kit
Water storage — FEMA’s baseline is 1 gallon per person per day; store a minimum 3-day supply; more if you live in a hot climate or have medical needs
Frozen water bottles — fill extra space in your freezer with water bottles before a storm; they act as thermal mass that extends safe freezer temperature by hours

Medical and Financial

First aid kit — stocked and not expired; include bandages, antiseptic, OTC pain relievers, and any condition-specific items
7-day supply of prescription medications — request a short early refill before hurricane season or winter storm season; pharmacies run out
Cash in small bills — card readers and ATMs require power; $100–$200 in $5s and $10s covers fuel, food, and supplies when electronic payments fail

Heat and Safety Equipment

Backup heat source — an indoor-safe propane heater (Mr. Heater Buddy series) with two 1-lb cylinders stored separately, or a wood stove if you have a permanent installation; see our heating without electricity guide for a full comparison
CO detector with fresh batteries — mandatory if you will use any combustion heat source; mount one at sleeping height in the room you plan to use

Home Prep Before an Expected Outage

Surge protectors on computers, TVs, and appliances — voltage irregularities during grid restoration damage electronics; a quality surge protector is cheap insurance
Generator installation and placement — if you own a generator, test it now; verify the 20-foot clearance rule from windows and doors; store fuel with stabilizer added
Set refrigerator and freezer to coldest setting — maximizing thermal mass before power goes out extends safe food storage by hours
Fill your bathtub — if a storm is forecast, filling the tub with water gives you a reserve for toilet flushing and basic sanitation if water pressure drops

Phase 2: During — Immediate Actions and Ongoing Management

First 30 Minutes

Unplug major appliances and sensitive electronics — computers, TVs, printers, and kitchen appliances should come off the circuit before power returns; the restoration voltage spike is often what kills electronics, not the outage itself
Turn off the thermostat (or set to manual hold) — prevents a heating or cooling system from cycling on unexpectedly when power returns
Check your circuit breaker — confirm it is a utility outage, not a tripped breaker in your panel
Check on elderly or vulnerable neighbors — within the first hour; do not wait to be asked

Food Safety Timeline

This is the most common source of preventable illness during and after a power outage.

Location	Door Stays Closed	Action Threshold
Refrigerator	Safe for ~4 hours	Discard perishables after 4 hours above 40°F
Full freezer	Safe for 24–48 hours	Safe to refreeze if ice crystals remain
Half-full freezer	Safe for ~24 hours	Discard meat/seafood if thawed completely

The rule of thumb: if you cannot confirm the food stayed below 40°F, and you are unsure how long it was above that threshold, discard it. Foodborne illness from a power outage is not worth the cost savings of a few groceries.

What to keep regardless: unopened commercially canned goods, hard cheeses, butter, fruit, bread, and raw vegetables do not require refrigeration for short periods.

Generator Safety Rules

This is not optional information.

Carbon monoxide poisoning kills multiple people every year during power outages — nearly always because a generator was run in an attached garage, screened porch, or too close to a window.

Never run a generator indoors. Not in the garage. Not in the basement. Not in a screened porch. Not in any enclosed or semi-enclosed space.
Minimum 20-foot clearance from any door, window, or vent, with the exhaust pointed away from the structure
A battery-powered CO detector inside the house is mandatory if a generator is running outside
Do not refuel while running — shut the generator off and let it cool before adding gasoline

Heat and Cold Management

When temperatures are extreme, comfort becomes a health issue.

Heat emergencies (no air conditioning): Core body temperature begins rising dangerously when ambient temperatures exceed 95°F and humidity is high. Signs of heat exhaustion include heavy sweating, weakness, and nausea. Move vulnerable household members to the lowest floor (cooler air settles), close blinds, use battery fans, and hydrate aggressively. If heat stroke symptoms appear (confusion, no sweating, very high body temperature), this is a medical emergency.

Cold emergencies (no heat): Hypothermia risk increases when indoor temperatures fall below 50°F, especially for elderly individuals or infants. Use the warming center strategy: consolidate everyone into the smallest interior room, seal drafts, and use your backup heat source there. See our full heating without electricity guide for fuel math and CO safety by heater type.

Phase 3: After — Safe Recovery

Before Power Returns Fully

Keep major appliances unplugged until power has been stable for at least 5 minutes; this protects against the initial restoration surge
Reset clocks, alarms, and timers — a power interruption resets digital devices; check that any medication timers or scheduled alarms are reprogrammed

Food Safety Decisions

Go through the refrigerator and freezer systematically:

Discard: raw or cooked meat, poultry, seafood, milk, soft cheeses, eggs, mayonnaise, and any prepared foods that spent more than 2 hours above 40°F
Keep (if still cold): hard cheeses, butter, fruit juices, opened fruit, raw vegetables, fruit pies, bread, and commercially canned goods
Frozen foods: if food still has ice crystals throughout and feels refrigerator-cold, it can be refrozen or cooked normally; if it has been fully thawed and above 40°F for an unknown period, discard it

The USDA food safety hotline (1-888-674-6854) is a free resource during declared disasters — use it when you are unsure.

Report the Outage to Your Utility

Many utility companies cannot dispatch repair crews to your address until an outage is reported. Even if you assume they know — report it anyway through their official app, website, or phone line. Localized outages affecting a small number of houses are often missed in the broader damage assessment.

Restock Before the Next Outage

The best time to resupply is immediately after an outage — before the supplies are needed again. Replace:

Any batteries that were used
Food and water consumed from your emergency supply
Fuel used by a generator or portable heater
Any medications that were in short supply

Mark the date and add a calendar reminder to test equipment and rotate perishable supplies every 12 months.

Printable Summary

Keep a laminated copy of this short-form checklist with your emergency supplies.

Before:

Flashlights, headlamps, and spare batteries ready
Power banks charged
Battery or hand-crank radio
72-hour food and water supply stocked
Manual can opener in the kit
First aid kit and 7-day medication supply
Cash on hand
Backup heat source and CO detector
Surge protectors installed

When the power goes out:

Unplug sensitive electronics immediately
Check the breaker — confirm it is a utility outage
Do not open the refrigerator or freezer unnecessarily
Check on vulnerable neighbors
Never run a generator or combustion heater indoors
Refrigerator food is safe for 4 hours; freezer for 24–48 hours

After power returns:

Wait 5 minutes before plugging appliances back in
Assess food — when in doubt, throw it out
Report the outage to your utility if not already done
Restock supplies before the next event

A power outage is a test of what you already have in place. The goal of this checklist is to make sure you pass that test before the lights ever go out.

Frequently Asked Questions

How long is food safe in the refrigerator during a power outage?

A refrigerator will keep food safe for approximately 4 hours if the door stays closed. After that, discard anything that has been above 40°F for more than 2 hours — especially meat, dairy, and leftovers. A full freezer holds temperature for 24-48 hours; a half-full freezer for about 24 hours. When in doubt, throw it out.

Can I run a generator in my garage with the door open?

No. Carbon monoxide from a generator can reach dangerous levels in an attached garage even with the door fully open. CO infiltrates the house through connecting walls and doors. Run generators at least 20 feet from any door, window, or vent — always outdoors with the exhaust pointed away from the structure.

What is the most important thing to do when the power goes out?

Unplug or turn off major appliances and sensitive electronics before power returns. When the grid restores, the voltage spike can damage computers, TVs, and refrigerator compressors. Surge protectors help, but physically disconnecting high-value electronics is more reliable.

How much water should I store for a power outage?

FEMA's baseline is 1 gallon per person per day for drinking and sanitation. For a 72-hour outage, that means 3 gallons per person minimum. Store more if anyone in the household has medical needs, you live in a hot climate, or you want to cover a longer scenario. Freeze water in advance to help keep your freezer cold longer during the outage.

Do I need a generator for a power outage?

Not necessarily. A portable power station (battery-based) handles phone charging, lighting, a CPAP machine, and small fans without any fuel, CO risk, or noise. A gas or dual-fuel generator is better for running a refrigerator, well pump, or window AC unit. For most households, a power bank, battery radio, and flashlights cover the basics of a short outage without any generator.