What Happens in the First 24 Hours After a Blackout?

Most people would remain calm in the first few minutes of a blackout. “It’ll be back in a minute” — that’s what almost everyone thinks. But what if it doesn’t come back?

Here is a realistic, hour-by-hour analysis of what really happens — and what you should do at each stage.

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Pillar / Area	Critical challenge	Key action	Wolf’s unvarnished verdict
Hours 0–6	Panic, misinformation, overloaded mobile networks.	Switch on the wind-up radio, assess the situation, inform your family.	“Mobile networks are overloaded after 2 hours. Your first assessment of the situation comes from the radio.”
2. Hours 6–12	Resources are not being secured — cash machines fail quickly.	Take stock of supplies, secure cash, fill up the tank while you still can.	“The first 6 hours determine which resources you’ll be able to get; after that, you won’t be able to get them.”
3. Hours 12–24	Isolation and a lack of communication lead to fatal mistakes.	Activate your neighbourhood network, organise emergency accommodation, and ensure you stay warm.	“After 24 hours without a plan, you become reactive rather than proactive — the most dangerous state.”

Minutes 1–15: The initial shock

The power goes out. Lights, computers, routers — everything’s off. Anyone at home reaches for their mobile first. Social media, news sites, WhatsApp — most are still working because mobile masts have emergency power.

Most people’s first reaction: wait and see. “Was it just us?” A glance out of the window reveals: the neighbours have no light either.

What you should do now:

• Switch on a wind-up radio or battery-powered radio → listen for official information
• Conserve your mobile phone battery: switch to flight mode, turn down the screen brightness
• Get out the torches and hand them out
• Do not use the lifts

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Hours 1–3: Realisation

It is slowly becoming clear: this is no ordinary brief power cut. News websites — if they are still accessible — are reporting a widespread outage. The mobile network is slowing down because everyone is trying to make calls at the same time.

The first panic buying begins in supermarkets. Anyone who goes to the shops now can still find water and food — but not for much longer.

Traffic lights are out. Road traffic descends into chaos, particularly in cities.

What you should do now:

• Contact family and key contacts — while the network is still working
• Agree on a meeting point in case mobile phones fail
• Turn on the taps and fill baths, pots and buckets — water pressure will hold out for a short while
• Keep the fridge and freezer doors closed (they’ll stay cold for 4–6 hours)
• Withdraw cash from an ATM — it may still work for a short while

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Hours 3–6: Water is running out

Now the first critical problem arises: the electric pumps that push water to the upper floors fail. Those living on the ground floor still have some water left. From the 2nd floor upwards: soon nothing at all.

Hospitals are running on emergency power — generators have enough diesel for 24–72 hours. Operations continue, but non-urgent treatments are postponed.

Petrol stations are closed — the pumps need electricity. Long queues form outside the few that have emergency generators.

What you should do now:

• Check your water supply: How much do you have?
• Ration water use: Only for drinking and cooking, no washing
• If you have a water filter: Identify alternative water sources (streams, rainwater)
• Inform and coordinate with neighbours — together we are stronger

👉 Water filters for a blackout: Which is the best?

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Hours 6–12: Social dynamics shift

After 6 hours, panic begins to spread. Supermarkets are empty or closed. Anyone who hasn’t stocked up at home now has a problem.

The mobile network becomes unreliable — masts gradually go offline as their emergency power runs out. Communication becomes difficult.

In cities, the first crowds begin to gather outside supermarkets, government offices and hospitals. The police are overwhelmed — their communication systems are running on backup batteries.

If you need medication: pharmacies usually still have emergency stocks, but prescriptions cannot be verified digitally.

What you should do now:

• Stay at home if possible — the streets are chaotic
• Set up a camping stove and prepare a hot meal (morale is important!)
• Keep important documents (ID, insurance) to hand
• Only leave candles burning under supervision — the risk of fire increases

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Hours 12–24: The first night

The first night without electricity is the hardest psychologically. Darkness, cold (in winter), no distraction from screens. Children are restless, older people frightened.

Heating systems fail — modern gas heating systems require electricity for controls and pumps. In winter, the room temperature in poorly insulated buildings drops below 15°C within hours.

Refrigerator contents are no longer safe after 12–24 hours — depending on the outside temperature. Freezers last up to 48 hours if they are full and not opened.

What you should do now:

• Sleep in a room with several people → make use of body heat
• Get out warm clothes, sleeping bags and blankets
• Prioritise fridge contents: what to eat first?
• Keep the radio on for official updates
• Reassess the water level first thing in the morning

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After 24 hours: What happens next?

After 24 hours, it’s clear: this is no ordinary outage. Authorities are setting up emergency supply points — water, food, medical supplies. This information is being broadcast via wind-up radios and loudspeaker vans.

Those who are well prepared can stay at home and relax. Those who are unprepared now face serious problems.

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The difference between panic and control

Everyone in this scenario is facing the same blackout. The difference is that some have three days’ worth of water and food, a torch, a wind-up radio, and know what to do. The others do not.

This preparation might cost you two hours and €100 today. In an emergency, it’s priceless.

👉 Everything you need for the first 72 hours — my emergency backpack comparison →

Don’t have a water supply yet? Read also: Purifying drinking water without electricity

Don’t have a food supply yet? Read also: Building an emergency supply: step-by-step guide