Why Norway and Sweden Moved From Three Days to a Week

In late 2024, two Nordic governments did something unusual. Norway raised its household preparedness guidance from three days of self-sufficiency to seven, and posted a booklet — How you can play your part in Norway's emergency preparedness — to households across the country. Sweden reissued its civil defence pamphlet Om krisen eller kriget kommer, If Crisis or War Comes, to roughly five million households, with expanded practical sections pointing in the same direction. Finland's guidance has centred on 72 hours, Denmark moved to recommending a few days of water, food and medicine, and Baltic advice has been specific enough to name a figure: keep nine litres of water per person in storage. Something changed in official thinking, and it is worth understanding what, because the reasoning is not country-specific.

The Three Reasons Given

The stated rationale was not a single threat. It was three converging ones. First, a more unstable security situation in Europe. Second, more frequent and more severe extreme weather, explicitly linked to climate change. Third, a rapidly growing dependence on digital systems — payment, logistics, communications, utilities control — which can fail through accident as readily as attack. Notice that only the first is about conflict. Two of the three apply identically to Britain, and the third had already demonstrated itself globally in July 2024 when a single faulty software update grounded flights, stopped payments and disrupted hospitals with no adversary involved at all.

Why Three Days Was Never Really the Number

The 72-hour standard was always a planning assumption rather than a measurement: roughly how long before organised help reaches an average affected household. The trouble is that recent events keep overrunning it, and not by a little. Storm Arwen in November 2021 left tens of thousands of British homes without power for days and some for well over a week, in winter, with the longest restorations running past nine days. The Brixham boil water notice in Devon ran from 15 May to 8 July 2024 — about seven weeks. Storm Éowyn in January 2025 cut power to over a million homes and businesses across Ireland and Northern Ireland. None of those events were the national catastrophe that risk registers are written around. All of them comfortably exceeded three days.

What a Week of Water Looks Like

Start here, because water is the constraint people most underestimate. Using around 10 litres per person per day — drinking, cooking and basic washing — a week is roughly 70 litres per person, or about 140 litres for a couple. That is a genuinely significant volume and more than most homes can permanently store. The realistic answer is layered: keep a solid base of bottled or containered water for drinking, know that a bathtub storage bag lets you add a very large volume quickly if you have any warning at all, and keep a filter for freshwater sources as a last resort. Store containers low down, in the dark, away from heat and away from paint or fuel, and label everything with its fill date.

A Week of Food, Built the Cheap Way

The expensive mistake is buying a dedicated emergency food supply you will never touch. The cheap and durable method is to add a few extra items to each normal shop until you have a week of food you actually eat, then cook from the front of the shelf and restock the back. Tinned fish, beans and tomatoes, pasta, rice, oats, long-life milk, peanut butter, tinned fruit, tea and coffee. Crucially, include several meals that require no cooking whatsoever, because a power cut can take your hob with it and a gas incident can take the alternative. Freeze-dried meals have real advantages — very long shelf life, very light, minimal water — but the cost per meal is high enough that they belong in a grab bag rather than as the foundation of a pantry.

Warmth, Light and a Way to Boil Water

A week without power in a Nordic winter is a survival problem, and Britain's milder winters do not make an unheated house pleasant — Storm Arwen's worst impacts were largely about cold. The practical kit is unglamorous: layers and proper sleeping bags rather than an attempt to heat the whole house, one room chosen as the warm room, reflective emergency blankets as a cheap backstop, torches with spare batteries, and a means of boiling water that does not need the mains. Anything that burns fuel must be used with real ventilation and never in a sealed room, a tent or a garage; carbon monoxide kills people in exactly these circumstances every year. A battery carbon monoxide alarm is a few pounds and worth every one of them.

Medicines, Hygiene and the Unromantic Middle of Week One

The difference between a three-day plan and a seven-day plan shows up mostly in things nobody puts on a shopping list. Prescription medication is the critical one: ask your pharmacy how to build a small buffer legitimately, and never ration a prescription to create one. Then painkillers, rehydration salts, any regular over-the-counter items, and a first aid kit you have actually opened and looked inside. And hygiene, which is where a long outage becomes genuinely unpleasant: wet wipes, hand sanitiser, heavy-duty bin bags, and a decided plan for the toilet if the water is off or you have been told not to use it. Working this out in advance is the single most underrated part of a week-long plan.

Cash, Radio and Information

The Nordic booklets all cover the same three items here, and recent European experience has validated every one. Keep cash at home in small denominations — the Iberian blackout of April 2025 stopped card payments across Spain and Portugal, and the Bank of Portugal advised households afterwards to hold a physical money reserve in varied denominations. Keep a battery or crank radio, because broadcast radio is the only information channel that reliably survives when the power and the mobile network do not. Keep power banks charged, because your phone remains your torch, camera and document store even with no signal. And write your important numbers on paper, since the app that holds them needs the thing that has failed.

The Part That Is Not About Supplies

The Norwegian and Swedish framing is notably collective rather than individual — the Norwegian booklet's title is about playing your part in national preparedness, not about protecting yourself from your neighbours. The practical version of that is straightforward. Know which people on your street would struggle badly in a week-long disruption: the very old, anyone with mobility problems, anyone dependent on powered medical equipment, households with a new baby. Make sure they are on their energy and water suppliers' Priority Services Registers, which are free and specifically exist to prioritise them. A household that has prepared and a street that has not is a worse outcome than a street that has.

The Wider Point

The shift from three days to a week was not a reaction to one headline. It was several governments concluding simultaneously that their existing assumption no longer matched the disruptions they were actually seeing — weather, digital fragility and an unstable security picture, all at once. Britain's own recent record, from Arwen to Brixham, says the same thing without needing to invoke any of the geopolitics. Nothing here requires a bunker or a budget. A week of water, a week of food you already eat, warmth, light, a radio, some cash in small notes and your medication. Built gradually, it costs very little, and it removes almost all of the difference between an inconvenient week and a genuinely bad one.