How to Prepare a Home for a Power Cut

Most UK power cuts are short and are fixed by the local electricity network operator, the company that owns the cables and wires in your street rather than the supplier that bills you. But a storm, a fault or, in Northern Ireland, a planned emergency cut can leave a home without power for hours, and a few simple preparations made in advance decide whether that is an inconvenience or a genuine problem. The free 105 number reaches your network operator day or night¹, food in a fridge stays cool for up to 4 hours with the door shut, and a full freezer holds its temperature for about 48 hours².

The households that cope best are the ones that know where their fuse box is, keep a torch and batteries in the house, and have signed up in advance to a priority or medical care register if electricity is needed for medical equipment¹. This page walks through the whole sequence: what to do before a cut, what to do during it, and what to check and claim afterwards.

Getting ready before anything goes wrong

Preparation for a power cut is mostly about knowing your own home. Know where your fuse box is so you can check it easily when the power goes off¹. Keep a torch and batteries in the house rather than relying on a phone, because a phone battery runs down and, in a widespread emergency, mobile service itself may be extremely limited or drop out entirely, so anyone who needs to contact people will need alternative arrangements made in advance⁶. Keep a mobile phone fully charged so it can be used to go online for updates or to call for help⁷.

If the cut is planned, there is more you can do. Turn the freezer's temperature settings down a couple of hours before the power is due to be switched off, so it starts the outage as cold as possible⁸. Have warm clothes and blankets accessible in case the cut turns out to be a long one, and if you are working or studying, back up your work before the power is anticipated to go off⁶. Remember electric gates and access points: open them, or shut them as appropriate, before the supply is interrupted⁶.

One piece of official advice runs against instinct. In a planned emergency cut caused by a shortage of generation, refrain from using more electricity in preparation, such as boiling kettles for flasks or charging mobile phones, because the system is already struggling with demand and a surge from many areas at once can make the situation more unstable⁶. The same page advises keeping a torch handy in case the cut falls during the night⁶, advice echoed by Northern Gas Networks for winter readiness generally⁹.

Households on a priority services register can get advance notice of planned power cuts where possible, giving time to charge hearing aids, visual alarms and vibrating pads¹⁰. And it is worth knowing in advance that compensation may be available after a cut: you might be entitled to it if you have one⁷. For the wider job of storm-proofing a home's energy supply, see preparing a home for storms and floods and preparing a home for winter.

The emergency kit: what to keep in the house

The core kit is small and cheap. Keep a torch handy in case you are without power during the night⁷, and keep spare batteries for it in the house¹. Alongside the torch, ensure warm clothes, blankets and food which does not need heating can be readily accessed¹¹. That last item matters more than people expect: in a cut, there is no kettle, no oven, no microwave, and gas boilers and heating, electrical appliances and the home's internet and landline connections will all stop working⁷.

A charged mobile phone is the communication plan for most households, which is why keeping it fully charged is standard advice⁷. But it cannot be the only plan. In a severe event, mobile phone service will be extremely limited and might drop out entirely, so anyone who needs to reach family, carers or medical support will need alternative arrangements in place before the power goes⁶. A battery power bank, kept charged, extends a phone's useful life well past a single outage.

For households that keep tropical fish, the kit includes a battery-operated air pump, and possibly a heater or generator kept ready, with ice packs or heating pads on hand to stabilise water temperature¹². It is a small example of the general principle: anything in the home that depends on a continuous electricity supply needs its own plan, because the network operator's plan covers the wires, not the fish tank.

Check the trip switch before assuming a power cut

When the power goes off, the first check is inside the house. Trip switches are found on the consumer unit, sometimes called the fuse box¹³. If there is a fault with your wiring or with one of your electrical appliances, the trip switches will turn off the power to the circuit the fault is on¹³, so a single tripped switch can look exactly like a power cut.

The diagnostic sequence is straightforward. If your trip switches are pointing upward whilst your electricity is off, the problem is not inside your home: check whether your neighbours and the street lights still have electricity¹⁴. If they do, you may have a problem with your main fuse, or you could be part of a power cut affecting only part of the street¹⁴. If your neighbours still have power but your home does not, it is likely there is a problem with the fuses or trip switches in your home¹⁵.

Knowing where the fuse box is before a cut, not during it, is the preparation step¹. If a trip switch has tripped, the fault may be a faulty appliance, and repeatedly resetting it without finding the cause is not a fix. For that situation, see what to do when a trip switch keeps tripping, and for the wider safety picture, how to turn off the gas, water and electricity in an emergency.

Reporting the cut: call 105

The single number to remember is 105. It is free to call³, and it puts you through to your local electricity network operator, the people who can actually help during a power cut¹⁶. The number was introduced by the electricity network operators to give an easy-to-remember route to the local people who can help¹⁵. You can report a cut and monitor progress by calling 105 or reporting online¹⁷.

Two points from the Met Office's guidance are worth fixing in mind. First, if your neighbours' power is also off, do not assume that the network operator has already been notified: always call to let them know¹⁵. Second, the operator you reach through 105 is not your energy supplier. Contact your network operator if you have a power cut or connection issues in your area¹⁸; the supplier bills you, but the wires belong to someone else.

For the full list of numbers covering every kind of home energy problem, see who to call for an energy problem.

How power comes back, and why your house cannot jump the queue

Restoration is not first come, first served, and it is not organised by who shouts loudest. Network operators cannot prioritise individual households: their teams work hard to restore power to affected areas but cannot move a particular home up the list¹⁰. What registration on a priority or medical care register does change is the support around the wait, not the wait itself.

For households on a priority register, operators must offer extra help during planned and unplanned power cuts, for example giving them battery packs so that they can still charge phones or medical equipment¹⁹. Some operators provide a free personalised Power Cut Plan tailored to communication preferences, equipment and support needs¹⁰.

The practical reading of this is honest rather than reassuring: the grid restores areas, not individuals, and a household that wants more control over its own resilience has to supply it itself, through the kit described above or the backup power options described later on this page. That is the independence argument in its plainest form. The wires will be fixed on the network's schedule; everything inside the house is on yours.

The Medical Care Register and powered medical equipment

Households that rely on electricity for medical equipment can join their operator's medical care register¹. In Northern Ireland this is the Northern Ireland Electricity Networks medical care register, and the advice is stated plainly: join it if you rely on electricity for medical equipment¹. In Great Britain the equivalent route is the Priority Services Register. You can join if you rely on electricity for medical reasons, use a stair lift, hoist or electric bed, have a specific communication need, or would find an unexpected power cut particularly distressing or difficult to cope with²⁰. Registration is free¹⁰.

The register is support, not a guarantee of supply. It helps the operator tailor its services to support households that may need extra help during a power cut²⁰, including the battery packs and advance notice described above¹⁹. The Met Office's advice for people dependent on power for medical equipment is to speak to your healthcare provider now if you do not already have your own power cut plan⁷. That conversation, about what the equipment needs and what happens if it stops, belongs to the household and its clinicians, not to the network.

Care and assisted living providers are advised to contact medical equipment suppliers and partner healthcare providers to prepare risk management plans for medical equipment losing power unexpectedly¹¹. The same logic scales down to a single household: know which devices have batteries, how long they last, and what the manual fallback is. If electricity is crucial for any medical equipment, contact your network operator at any time, as they may be able to put you on their priority register¹⁵.

While the power is off: warmth, the freezer and one light left on

During the cut itself, the advice converges on a few consistent actions. Keep the fridge and freezer doors closed as much as possible to keep the cold air within them²¹. Leave at least one light on so you know when your electricity is back on²², or simply leave a light switched on so the return of power announces itself¹. Turn off electric cookers, heaters and sensitive electrical equipment such as TVs and computers¹, and switch off all electrical appliances that are not designed to run unattended, for example cookers, grills, chip pans, hair straighteners and electric fires²². The reason is obvious once stated: when power returns, an unattended chip pan or electric fire comes back on at full heat with nobody watching.

Surge protection is the second reason to switch things off. Unplug smaller appliances and electrical equipment, and switch off larger appliances such as electric showers, to prevent electrical surge damage when power is restored²³. Never touch damaged electricity equipment, and check on elderly or vulnerable neighbours, family and friends¹.

Keeping warm matters most in winter and during long cuts. Have warm clothes and blankets accessible⁶, and layer up rather than trying to heat a room with whatever portable heater can be found. Portable heaters carry their own risks, and Electrical Safety First's guidance on them is worth reading before, not during, an emergency²⁴. For the related winter hazards, see how to prevent and deal with frozen pipes and how to thaw a frozen condensate pipe.

Food safety: 4 hours in the fridge, up to 48 in a full freezer

The most important rule is the one every source repeats: keep the refrigerator and freezer doors closed⁴. A refrigerator will keep food cold for about 4 hours if the door is kept closed⁴, and food in a fridge can stay safe for around 4 hours without power¹⁷. A full freezer will keep temperature for about 48 hours, or 24 hours if half full⁴. Energy Networks agrees on the freezer range: between 24 and 48 hours depending on how full it is²¹, and in warm weather a full freezer may remain cold for up to 48 hours while a half-full one holds for about 24 hours¹⁷.

The figures differ slightly at the margins. One source, writing specifically about planned emergency power cuts in Northern Ireland, gives a shorter freezer window of 15 to 24 hours if the door can be avoided, and 4 to 6 hours in the fridge²⁵, a more cautious range than the 48-hour figure given for a full freezer elsewhere⁴. The difference reflects how full the freezer is and how long the outage is expected to last; the conservative reading is the safer one.

If the power is going to be out for an extended period, buy block ice to keep the refrigerator as cold as possible⁴. To keep fridge contents cold longer, add ice and pack food tightly in the drawers⁸. And the disposal rule is blunt: contents should be safe for many hours but, if in any doubt, dispose of the food if it appears to have defrosted²⁶. Resist opening and closing the fridge and freezer unnecessarily, because you never know how long the outage may last²³.

Backup power: generators and UPS devices

Backup power is where a household's energy independence either exists or does not, and the safety rules are strict. In an emergency power cut scenario it will not be possible to connect generators²⁵: own generation must be connected by a qualified professional, not improvised when the lights go out. If you already have a backup generator, check it meets the power needs and connections you might have to support in an emergency¹¹.

An uninterruptible power supply, or UPS, is not a generator. These provide a few minutes of emergency battery backup if power fails¹¹, enough to shut down a computer safely or bridge the gap while a longer-term plan starts, not enough to run a household. Households that keep tropical fish are advised to keep a battery-operated air pump, heater or generator ready¹², which is the same principle applied to a smaller load.

The system-level view backs this up. The Climate Change Committee's monitoring of a well-adapted energy system counts emergency preparedness and response among the adaptation actions that matter, including early warning systems, staff training and protection measures, incident management protocols, and backup power for alternative supply²⁷. For a home, that translates into the kit and the register described above, plus any professionally installed generation. For the wider picture of taking control of a home's energy, see how to take more control of your home's energy.

Smoke and heat alarms: the safety net that works in the dark

A power cut changes a home's fire risk, because candles get used, portable heaters appear and normal routines break down. The baseline protection is simple and non-negotiable: ensure there is at least one smoke or heat alarm per floor in your property, and test alarms at least once a month²⁴. A cut is also a good reminder to check alarms, since moving around a dark house is exactly when working alarms matter most.

The monthly test is the part most households skip, and it is the part that decides whether the alarm is decoration or protection. For the full testing and maintenance routine, see how to test and maintain smoke, heat and carbon monoxide alarms.

When the power returns: clocks, claims and compensation

Power should return to your home automatically and, if it was a planned power cut, within one hour after the expected time of reconnection². In Northern Ireland's rota disconnection scheme, power might be switched off or reconnected around 30 minutes before or after the published time depending on national demand²⁸. Once it is back, it may be necessary to adjust time switches and clocks²⁶, and anything that was switched off before the cut can be switched back on one item at a time.

Compensation depends on the type of cut. For unplanned cuts not caused by bad weather affecting fewer than 5,000 premises, compensation applies if the power is off longer than 12 hours²⁹. For storm-related cuts, the threshold depends on the storm's category: for a category 1 storm you get £90 if the power was off for 24 hours, and for a category 2 storm, £90 if it was off for 48 hours⁵. Storm payments are normally automatic, but if the operator has not paid within 4 weeks of the power coming back on, contact them to make a claim⁵.

Deadlines are strict. For planned cuts, you must claim within 1 month of the start of the power cut⁵, and the same 30-day window is stated for planned outages elsewhere²⁹. If you make a claim for an unplanned cut and the operator has not paid within 10 working days, an extra £40 compensation is also owed⁵. For households with four or more power cuts in a 12-month period, there is 3 months to claim after the end of March, and an accepted claim should be paid within 10 working days¹⁶; this is not available if a cut was planned and you had been told about it, or if you qualified for compensation from any power cuts in the same 12 months¹⁶.

Not everything qualifies. Compensation is not paid for blackouts caused by a national power shortage, damage to electrical equipment or appliances, or a low supply after a power cut³⁰. If a claim is refused or the operator will not engage, the escalation route is the energy complaints process: see how to complain about an energy supplier and escalate it.