Power & Grid Survival • 72-HOUR PLAN
72-Hour Power Cut Plan: A Household Checklist for the First Three Days
The first 72 hours of a serious outage are when households discover which routines depend on electricity and which preparations actually matter. This plan turns those hours into a sequence rather than a scramble.
Before the outage: build a small buffer
Keep torches and spare batteries where you can find them in the dark. Store some drinking water and familiar shelf-stable food that needs little or no cooking. Keep power banks charged, write down important phone numbers and make sure everyone knows 105 for electricity network faults in Great Britain. Add medication, baby supplies, pet needs and any medically essential powered equipment to the household plan. If you qualify for the Priority Services Register, arrange that before a crisis. The aim is not a bunker. It is enough redundancy that the first day can be spent assessing the situation rather than shopping in a crowd.
Hour 0–1: safety, people, information
Account for everyone. Check for fire, flooding, damaged electrical equipment or other immediate hazards. Turn off dangerous cooking and heating appliances and keep away from fallen power lines. Confirm whether neighbours are also affected. Check verified network-operator information, radio or official alerts. Write down the outage start time and any restoration estimate. Put phones into low-power mode and stop non-essential charging or entertainment. Keep fridge and freezer doors closed. If there is a life-threatening emergency, call 999 or 112 using any available network.
Hours 1–12: protect temperature and battery
The first night is about keeping people safe and preserving options. In winter, layer clothing, close curtains and shut unused rooms. In summer, move vulnerable people to the coolest safe room and protect hydration. Use torches instead of candles where possible. Set phone check-in windows rather than leaving devices active constantly. Identify which foods are most vulnerable if refrigeration is lost, but avoid opening the fridge repeatedly. If someone relies on medical equipment, follow the outage plan agreed with the equipment provider or clinical team.
Hours 12–24: count what you actually have
Make a written inventory of safe water, meals, medication, batteries, lighting and alternative power. Decide which devices are essential and which can remain off. Check water pressure and any official water-supply messages. If you have backup electricity, use manufacturer instructions and keep combustion generators outside and well away from doors, windows and vents. Avoid DIY back-feeding or improvised wiring. By the end of day one, the household should know its most likely limiting resource and the conditions that would make relocation necessary.
Day two: shift into a sustainable routine
Set meal times, information checks, battery charging windows and hygiene routines. Check neighbours, especially anyone older, disabled, medically vulnerable or isolated. Keep written notes because digital information may disappear. Use food in a safe order and follow current Food Standards Agency guidance if chilled storage has warmed. Do not let anxiety create unnecessary travel; roads, fuel stations and payment systems may be less reliable during a wider outage. If official support points or community hubs open, note their locations and rules.
Day three: decide whether the plan extends or changes
Reassess the event from evidence. Is restoration now expected? Are water, mobile networks and shops functioning? Has the home become too cold, hot or medically unsafe? If the outage continues, plan the next seven days rather than simply repeating day one. Preserve what still works, replace resources through official or reliable local channels and relocate only when the household has a safer destination and a clear reason. The best 72-hour plan ends with a decision, not exhaustion.
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Build this topic into a wider plan, then see how the same dependency could fail in an AI-collapse scenario.
Evidence desk
Practical actions on this page are grounded in current UK emergency, food-safety and electrical-safety guidance. Any AI-driven nationwide failure chain is scenario analysis, not a claim that such an event is occurring or inevitable.
Practical guidance reviewed: August 2026 · In a real emergency, follow official local instructions and emergency services.