What to Do When the Power Goes Out: A Step-by-Step Checklist

When the power goes out, the first few minutes matter more than most people think. The right first moves protect your food, stretch your phone battery, and stop you wasting backup power on the wrong things.

The goal is simple: stabilise the situation first, then decide how to use whatever backup you actually have. A calm checklist beats improvisation every time.

Quick Answer

• Check whether it is just your property or a wider outage
• Put your phone on low power mode
• Keep the fridge and freezer closed
• If you have backup power, run only high-value essentials first
• Unplug sensitive electronics if power is unstable or likely to surge back

The big mistake is to behave as if the outage length is known. It usually is not. Manage the first hour as if restoration will take longer than you hope.

First Steps

Priority	Action
1	Check whether neighbours also lost power and check your breaker panel.
2	Report the outage or check the utility outage map if it is a wider failure.
3	Preserve your phone battery and charging options immediately.
4	Keep the fridge and freezer closed.
5	Decide what actually deserves backup power.

If You Have Backup Power

Priority load	Why it usually comes first
Router + modem	Very low draw for high practical value.
Phone charging	Critical communication load, tiny energy cost.
Medical devices	Priority if anyone depends on them. See CPAP and oxygen concentrators.
Fridge or freezer	Important, but often rotational rather than continuous.
Sump pump	Critical if your basement floods without it, and the heaviest load here.
Lighting	Useful and usually cheap in wattage if LED.

Darker cells mean higher practical value per watt during an outage.

For a deeper router backup walkthrough, see How Long Can a UPS Run a Router and Modem?. For fridge planning, see Your Fridge Uses Less Power Than You Think.

If You Do Not Have Backup Power

Problem	Best immediate move
Food safety	Keep the fridge shut. A closed fridge often stays safe for about 4 hours.
Electronics safety	Unplug sensitive devices before unstable restoration.
Lighting	Use torches, lanterns, or headlamps first.
Cold weather	Consolidate into one room and preserve body heat.

If you are relying on mains return alone, this is also when a real surge protector matters.

Try It in the Calculator

Setup	Scenario	Open
Router + modem	8 hours	Calculate
CPAP	8 hours	Calculate
Small fridge + router + phone	8 hours	Calculate

If you want to prepare before the next outage, use the calculator and size backup around the loads you actually care about.

What People Miss

Internet gear is usually cheap to run. Keeping connectivity alive often gives more value per watt than almost anything else.

A fridge can often wait at first. Opening the door too often does more damage than leaving it shut.

Battery backup gets wasted by panic-plugging. Selective use beats trying to run the whole house.

Power restoration can be messy. A rough return can be more dangerous to electronics than the outage itself.

Bottom Line

In the first minutes of an outage, preserve information, food temperature, and battery life. Then use any backup power selectively, starting with communications, medical needs, and the smallest high-value loads.

Preparation changes the whole experience. Try this in the calculator if you want to work out what backup is enough before the next outage instead of during it.