How long power cuts last in the UK

Power cuts last anything from a few minutes to several hours for most UK households, with widespread or storm-related outages occasionally running into days. The exact length depends on the cause, how many homes are affected and the weather, and there is no single national average restoration time published by a UK regulator that you can rely on.

What is fixed, though, is the point at which you are owed money. Under Ofgem’s Guaranteed Standards, a long outage triggers automatic compensation once it passes 12 or 24 hours, depending on how many homes are hit. Knowing those thresholds, who to call and how to keep food and heating going matters more than any average figure.

Free Price Compare sources the rules below from Ofgem, Citizens Advice and National Grid, and we also help households cut what they pay for the energy they do use.

Last updated: August 2026

Written by the Free Price Compare editorial team | Reviewed August 2026

How long do power cuts usually last in the UK?

Most UK power cuts are resolved within a few hours, while widespread or storm-damaged faults can take a day or more to restore. The official compensation framework is built around this pattern: many local faults are fixed quickly, so payments only start once an outage passes 12 hours, according to Ofgem’s compensation rules. There is no verified UK-wide statistic for the average length of a power cut in the supplied regulatory data, so treat any “average X hours” claim with caution. What matters for you as a household is not a national average, but whether your own outage is heading past the compensation thresholds and whether you are prepared to sit it out safely.

Short, local cuts often come from a single blown fuse, a damaged underground cable or a fault on one substation, and network engineers can reroute supply or repair these within hours. Longer cuts tend to involve storm damage across many streets, where crews have to reach and repair overhead lines in poor conditions.

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Why are some outages resolved quickly while others last longer?

Outage length depends mainly on the cause, the location and the weather. A fault on one underground cable feeding a small number of homes is usually the quickest to fix, because engineers can isolate the fault and switch supply to a healthy circuit. Storm damage to overhead power lines across a wide rural area is the slowest, because crews must physically travel to each break, sometimes over difficult terrain, and cannot work safely in high winds or lightning. Storm Arwen in late 2021 left some homes off supply for over a week, which is why Ofgem’s Guaranteed Standards include an escalating scale of payments for very long outages.

Three factors decide how long you wait:

• Cause: a tripped protection device restores fast; a snapped overhead line takes longer; a flooded substation can take days.
• Scale: a fault hitting thousands of homes stretches available engineers, though it is also prioritised.
• Weather: ongoing storms delay repairs because crews cannot work at height safely.

Your local Distribution Network Operator, the company that owns the poles, wires and substations in your region, is responsible for restoring supply, not your energy supplier. You can find and report faults through the National Grid power cuts service or by calling 105.

What counts as a long power cut for compensation?

A power cut counts as “long” for compensation once it passes 12 hours where fewer than 5,000 homes are affected, or 24 hours where more than 5,000 homes are affected. In both cases you can claim £95, then £45 for each further 12 hours you remain off supply, according to Ofgem. Citizens Advice summarises a comparable consumer-facing scale of £100 after the relevant threshold, then £45 for each extra 12 hours up to £400. The exact figures and caps depend on which rule set applies, whether the cut was normal or storm-related, so check both sources for your specific situation.

The escalation and caps work like this under the published rules:

Figures are indicative and may change. Storm-related outages follow a separate schedule with a higher cap of up to £2,165 in one Ofgem rule set based on six-hour increments, and a lower £390 to £400 maximum applies under the standard scale.

Prepare before the next outage

A torch, power bank and a plan for your fridge make a long cut manageable

Read the power outage guide

Do I need to claim, or is compensation paid automatically?

Compensation for a long power cut is usually paid automatically by your Distribution Network Operator, so in most cases you do not need to claim. Ofgem states that payments are normally made without you doing anything, but you should contact your network operator if you believe you were eligible and nothing arrived, according to Ofgem. The payment comes from the network company that runs the cables in your area, not from your gas and electricity supplier, so do not wait for your supplier to contact you. Payments are typically credited to your account or sent by cheque within a set number of working days after the outage ends.

To protect your right to payment, note the date and rough times your power went off and came back on, and keep the reference number if you reported the cut on 105. If you are on the Priority Services Register, a free scheme for older, disabled or vulnerable customers, your network operator should also keep you updated during longer outages.

For the full picture on how outages affect your account, see our guide to power cuts, energy bills and compensation.

Do power cuts reduce my energy bill?

A power cut does not reduce your energy bill in any meaningful way, because you are billed for the units you actually use, and a short outage saves only the small amount of electricity you would have consumed while it was off. Your fixed standing charge, the daily fee that covers being connected to the grid, still applies during a cut. For 1 October to 31 December 2025 the typical electricity standing charge was around 53.68p per day, so a few hours without power makes almost no difference to your bill. If anything, some households see a short spike in usage afterwards as fridges, freezers and heating work harder to recover.

If cutting your bill is the real goal, switching tariff has a far bigger effect than any outage. The energy price cap for 1 April to 30 June 2026 was £1,641 for a typical dual-fuel household paying by Direct Debit, and many households on standard variable tariffs sit above the cheapest available fixed deals. Reducing standby power and understanding what uses the most energy in your home will save more than watching for outages.

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What should you do in a power cut?

In a power cut, first call 105 free to report it and check whether it is a wider outage or a fault in your own home. The power cut emergency number, 105, connects you to your Distribution Network Operator anywhere in England, Scotland and Wales, according to National Grid. Next, check whether your neighbours have power too: if they do, the problem is likely your own fuse box or a tripped switch, not the network. Keep your fridge and freezer doors shut, because a full freezer can hold its temperature for hours if left closed, protecting your food and avoiding waste.

A few practical steps make a long outage manageable:

• Report and check: call 105, then see if neighbours are affected.
• Protect appliances: switch off and unplug sensitive electronics to guard against a surge when power returns, which can damage boiler control boards.
• Keep the cold in: leave the fridge and freezer closed as long as possible.
• Have backup light: torches and a charged power bank beat candles for safety.
• Keep some cash: card machines and ATMs may not work during a wider outage.

If you rely on electrical medical equipment, sign up to the Priority Services Register in advance so your network operator knows to prioritise and update you. For a fuller checklist, read our guide on how to prepare for and deal with power outages.

Why do power cuts seem rarer than they used to be?

Power cuts feel rarer than in past decades because the UK’s electricity network has become more automated and better maintained, with faults now often rerouted or repaired before many households notice. Distribution Network Operators use remote switching to restore supply on nearby circuits within minutes for many faults, so a cut that once lasted hours can now be far shorter or avoided entirely. Older readers often remember thunderstorms knocking out power for a day at a time, and while severe storms like Storm Arwen still cause long rural outages, everyday reliability has improved. This is a network-infrastructure trend rather than a change in the compensation rules, which remain active and are still promoted by Ofgem and Citizens Advice.

That said, reliability varies by area. Rural households on overhead lines still see more frequent and longer cuts than urban homes on underground cables. Standby appliances quietly drawing power around the clock also add to bills whether or not you get outages, which is why reducing standby power costs is worth doing regardless of how reliable your supply is.

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Information correct as of 12 August 2026. Prices, tariffs, policy details and providers change frequently, so please check the latest details before making a decision. This article is for general information only and does not constitute financial advice. Free Price Compare is authorised and regulated by the Financial Conduct Authority (FCA).