How to protect home electronics during a power cut

A power cut can stop a desktop computer mid-save, disconnect your broadband and interrupt smart-home devices. The immediate loss of electricity is only part of the problem: voltage disturbances can also affect sensitive equipment.

The most useful protection combines simple habits, appropriate surge protection and battery backup for the devices you need most. Here is a practical plan for UK households.

• Use a battery-powered torch to find your way safely.
• If a computer is still running on a UPS or laptop battery, save your work and shut it down normally.
• Where safe and accessible, switch off at the socket or unplug non-essential electronics such as TVs, games consoles and desktop computers.
• Leave one light switched on so you can see when the supply returns.
• Check your electricity network operator's outage information. In England, Scotland and Wales, call 105 to report a power cut. In Northern Ireland, call NIE Networks on 03457 643 643.

UK Power Networks recommends disconnecting sensitive equipment during an outage. Read its advice on protecting appliances. The UK government's power-cut guidance confirms the reporting numbers.

Never touch damaged, wet or exposed electrical equipment. Keep clear of fallen cables. If someone is in immediate danger, call 999.

A surge protector is designed to limit certain voltage spikes reaching connected equipment. It does not keep devices running when the mains supply fails.

Check the product description: an ordinary multi-socket extension lead is not necessarily surge protected. Follow the manufacturer's instructions and check any protection-status indicator. No plug-in protector guarantees protection against every disturbance or a direct lightning strike.

An uninterruptible power supply, or UPS, can supply connected equipment from a battery when mains power fails. For a home office, its main purpose is often to give you time to save files and shut down safely.

Choose a UK-compatible model whose watt and VA limits both cover the equipment you plan to connect. Check the manufacturer's runtime chart at your expected load; the headline VA figure alone does not tell you how long it will run. Some sockets may offer surge protection without battery backup.

Use the correct connections and follow the installation instructions. APC advises connecting its UPS products directly to a wall socket rather than adding surge strips or extension leads. See APC's UPS buying guide and connection guidance.

Turn on automatic saving where available, and keep a separate backup of important files. A UPS cannot replace a backup: it has limited runtime and its battery needs maintenance.

Make a short list of what genuinely needs uninterrupted power. A desktop computer, essential monitor and storage device may matter more than speakers or a printer. Avoid connecting high-power appliances such as heaters or kettles to a small computer UPS.

For laptops, keep the battery in good condition and charge it ahead of a planned outage. If your files are stored on a network drive, remember that the drive and networking equipment also need power.

Keeping a router powered does not guarantee an internet connection: equipment elsewhere in the network may also lose power. Your home connection may need a modem or fibre optical network terminal as well as the router.

Ask your broadband provider which devices need backup and which solutions are compatible. Keep a charged mobile phone and power bank available, while recognising that mobile coverage can also be disrupted.

Digital landlines depend on powered equipment. If you rely on a landline or use a care alarm, discuss outage arrangements with your phone provider and alarm supplier before you need them. Ofcom explains digital landlines and power-cut backup.

Check leads and plugs for damage, discolouration or unusual heat. Do not overload extension leads or connect one extension lead to another. Buy suitable UK products from reputable retailers.

If sockets repeatedly trip, plugs become hot or you notice a burning smell, stop using the affected equipment and seek help from a registered electrician. Do not open a UPS or attempt mains wiring repairs.

Electrical Safety First's extension-lead advice explains load limits and warning signs.

Follow your network operator's updates and each device's restart instructions. Reconnect essential equipment first, then other devices individually. If power keeps dropping out, leave non-essential electronics disconnected and report the problem.

Check computers and storage devices for errors before returning to normal use. Let backup batteries recharge according to their manuals. If equipment appears damaged, stop using it and arrange an assessment.

Do not assume they will. Many grid-connected solar and battery installations stop supplying the home during an outage. Backup operation needs suitable equipment and configuration.

Ask your installer whether your system supports power cuts, which circuits it can supply, its output limits and how it switches to backup. Energy Saving Trust explains this limitation.

If you are considering storage, use PowerGuardian's Battery ROI Calculator to explore costs and savings. Treat financial payback and outage protection as separate questions.

• Know your network operator and save its contact details.
• Keep a torch, charged phone and power bank accessible.
• Back up important files and enable automatic saving.
• Check surge protection and UPS suitability for essential devices.
• Follow the manufacturer's battery testing and replacement guidance.
• Make a specific plan for medical equipment, telecare or essential communications with the relevant provider.

For wider preparation, read UK Power Cuts: How to Prepare Your Home, or explore why some areas are more vulnerable to power cuts.

Sources checked 12 October 2026. This guide covers household electronics; specialist medical equipment needs a provider-approved continuity plan.

Affiliate links: As an Amazon Associate I earn from qualifying purchases. Check the current listing, UK connections and suitability for your equipment before buying.

Decide which devices you need to keep running, then read Choosing a UPS for a UK home office to compare capacity, runtime and UK connections.

Explore more practical guides and tools in the PowerGuardian Knowledge Centre.

For phone charging, see our Anker Zolo power bank page. For broader preparation, use the UK power-cut checklist. Compare further options in our product guide.