5 things that help you get through a multi-day blackout in a flat

The five, at a glance

1Charge everything the moment the warning arrives2Tape a reminder on the fridge and stop opening it3Fill the bathtub before the outage, not after4Get one good lantern; retire the candle romanticism5Have something genuinely good to do offline
1

Charge everything the moment the warning arrives

A full battery is infrastructure. The window between a storm warning and the lights actually going out is usually a few hours, and almost nobody uses it. Your phone at 100% buys you two days of careful use; at 40% it is gone by tomorrow morning. The same logic applies to your laptop, which doubles as a charging hub for everything else once the power is out. The regret of a power bank sitting at 34% when the lights go out is very specific and very avoidable.

Ready.gov — power outage preparedness

Try it
The moment you see a severe weather alert or hear about grid work in your area, plug in every device you own — phone, laptop, earbuds, e-reader, power banks — and leave them until full, even if they are already at 80%.
If you have a power bank, this is the single most impactful thing you can do. A 20,000 mAh bank will fully charge most phones four or five times; a 10,000 mAh one is easier to stash and still covers two to three full charges. Either is useful on ordinary days too, so it is not a specialised purchase.
Set your phone to low-power mode as soon as the outage starts — not when you hit 20%. Turn off background refresh, location services, and Wi-Fi scanning (there is no Wi-Fi to find). A phone in low-power mode can stretch a medium power bank across two days of light use.
2

Tape a reminder on the fridge and stop opening it

Every time you open the fridge door you bleed cold air you cannot get back. A fully stocked, closed fridge holds a safe temperature for about four hours after power loss; a full freezer holds for 24 to 48 hours. The mistake almost everyone makes is opening the fridge in the first hour to 'check on things' — exactly when the food is still fine and the cold air is most worth preserving. The goal is to treat that door as sealed until you have a specific plan for what you are grabbing.

USDA FoodSafety.gov — food safety during power outage

Try it
The moment the power goes out, put a piece of tape over the fridge handle as a physical reminder. It sounds slightly silly; it works brilliantly at 2am when you are half-asleep and just want a drink.
Decide on a meal plan for the next 24 hours using what you already know is inside, then open it once, grab everything you need, and shut it again. Before any outage, move the food you will eat first to the most accessible spot so you can do this in under ten seconds.
After four hours, switch to shelf-stable food and do not open the fridge again until power is restored or until you are ready to assess and discard. The USDA rule is blunt: if perishable food — meat, fish, soft cheese, leftovers — has been above 4°C (40°F) for more than two hours, throw it out.
3

Fill the bathtub before the outage, not after

Most urban flats keep tap water even during a blackout — water runs on separate infrastructure — but booster pumps in taller buildings do run on electricity, and if there is a related infrastructure failure, water can go off without warning and faster than you would expect. More practically, a bathtub holds 150 to 300 litres, which covers flushing, washing up, and basic hygiene for two or three days at no cost whatsoever. The time to fill it is before the outage, not when you are already in the dark wondering why nothing is coming out of the tap.

Ready.gov — water storage

Try it
When an outage looks likely, fill smaller containers first — bottles and jugs you can actually drink from — then fill the bathtub last, since it is the largest vessel and takes the longest.
If your bath plug does not seal well, lay a bin bag over the drain and fill the bag — it holds water surprisingly well and costs nothing.
Keep a cup or ladle next to the tub so you can scoop water to flush the toilet manually. Pour directly into the bowl, not the cistern, for an immediate flush.
4

Get one good lantern; retire the candle romanticism

Candles are genuinely pleasant for about 40 minutes and then become a low-grade anxiety because you cannot leave them unattended, they drip, and they are a real fire risk in a stressed household — especially with children or pets. A modern LED camping lantern gives more usable light than six candles, runs for 40-plus hours on a set of AA batteries, can be hung from a door hook or curtain rail, and you can walk away from it. The reason people default to candles is that they already own them; the reason a lantern is worth the upgrade is that it removes an entire category of worry from an already stressful situation. If you can, choose one with a warm-toned LED rather than a blue-white one — after several hours in a small room, the difference is noticeable.

Ready.gov — power outage preparedness

Try it
Buy one mid-range LED lantern — the collapsible camping kind — and store it with a spare set of AA or AAA batteries in a kitchen drawer you will actually find in the dark. A basic model costs around £10 to £15.
Test it every six months by actually turning it on. A lantern sitting in a drawer with corroded batteries is useless precisely when you need it.
If you are using candles, confine them to stable holders in glass jars rather than tall pillar candles — they are far harder to knock over — and never leave them lit in a room you are leaving or go to sleep with them burning.
5

Have something genuinely good to do offline

This gets left off every preparedness list because it sounds soft, but by hour 14 of a blackout the psychological wear is real. Anxiety spikes when you cannot work, cannot scroll, and cannot distract yourself with your usual habits. The people who get through multi-day outages most easily are almost always the ones with an absorbing offline activity — a novel they have been meaning to read, a card game, a puzzle, something with their hands. It is not about being stoic; it is about having your attention somewhere other than the hum of the missing electricity. There is also a practical dimension: less phone use means longer battery life.

Try it
Keep one physical book you genuinely want to read somewhere visible — not a book you feel you should read, one you actually want. A battery-powered reading light or headtorch makes this viable after dark.
A single deck of cards, a small jigsaw, or a downloaded podcast series costs almost nothing and occupies hours. Download a few episodes onto your phone now, before any outage, while you have the broadband.
If you have children, a couple of small activity books or a colouring set stored in the same drawer as your lantern will earn its keep many times over. The novelty of a dark flat wears off for small children much faster than for adults.

What didn't make the list

Buying a solar panel kit

For a 2–3 day urban flat outage, a solar panel is overkill in cost and logistics. Most flat balconies get limited direct sun, the panels are expensive, and a decent power bank does the same job for a fraction of the price. Worth considering if you have a large south-facing terrace and lose power regularly; not worth it for most renters who will use it twice in a decade.

Stocking freeze-dried survival food

Almost nobody needs this for a city power cut. Most urban outages resolve within 72 hours, supermarkets reopen quickly, and you almost certainly already have enough tinned, dried, or shelf-stable food in your kitchen to eat reasonably well for three days without buying anything new. Check your cupboards honestly before spending money on expensive pouches marketed at people planning for something much more dramatic than a lost weekend.

Questions people ask

How long does food in the fridge and freezer actually stay safe during a power cut?

According to USDA food safety guidance, a closed fridge will keep food safe for about four hours. A full freezer holds for roughly 24 to 48 hours (around 24 hours if it is half-full), provided you keep the door shut. When in doubt about a specific item — particularly meat, fish, dairy, or anything containing eggs — discard it. The rule is simple: if you are not sure, throw it out. Food poisoning on top of a power cut is not a situation you want to manage from a flat with no working appliances.

Can I charge my phone from my car during a blackout?

Yes, and it is one of the most underused options for renters without a generator. A USB car charger or the built-in USB port in most cars charges a phone or power bank just fine while the engine is running. Run the engine outside — not in a garage, even with the door open, as carbon monoxide from a running engine builds quickly in enclosed spaces. Fifteen to twenty minutes of run time will put a meaningful charge into a phone. If an outage warning is coming, it is also worth topping up the fuel tank while petrol stations still have power to run their pumps.

What is the single most useful thing to have bought before the blackout?

A fully charged power bank and a decent LED lantern with fresh batteries in it. Not because they are exciting, but because after ten hours without power the two things you most want are light you do not have to babysit and a phone that is not dying. Everything else — food, warmth, water, something to do — you can mostly improvise from what you already own. Those two things you cannot easily improvise at midnight on day two.

Sources

  1. Ready.gov — power outage preparedness
  2. USDA FoodSafety.gov — food safety during a power outage
  3. American Red Cross — how to prepare for emergencies
Illustration of Theo Brennan

Theo writes our Prep lists. He is not a survival expert — he is someone who has sat through enough multi-day power cuts and storm warnings to learn what actually matters when the lights go out, and what is just expensive kit gathering dust. Every list sticks to the calm, useful end of preparedness: food, water, warmth, light. For anything medical or genuinely dangerous, he will point you to the Red Cross or your emergency services — never pretend a checklist is a substitute. More from Theo Brennan

Keep going

Five things that help, every Sunday.

One list a week, picked by hand.